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Spring Security 案例实现和执行流程剖析
在線演示
演示地址：http://139.196.87.48:9002/kitty
用戶名：admin 密碼：admin
Spring Security
Spring Security 是 Spring 社區的一個頂級項目，也是 Spring Boot 官方推薦使用的安全框架。除了常規的認證（Authentication）和授權（Authorization）之外，Spring Security還提供了諸如ACLs，LDAP，JAAS，CAS等高級特性以滿足復雜場景下的安全需求。
Spring Security 應用級別的安全主要包含兩個主要部分，即登錄認證（Authentication）和訪問授權（Authorization），首先用戶登錄的時候傳入登錄信息，登錄驗證器完成登錄認證并將登錄認證好的信息存儲到請求上下文，然后在進行其他操作，如接口訪問、方法調用時，權限認證器從上下文中獲取登錄認證信息，然后根據認證信息獲取權限信息，通過權限信息和特定的授權策略決定是否授權。
接下來，本教程將分別對登錄認證和訪問授權的執行流程進行剖析，并在最后給出完整的案例實現，如果覺得先讀前面原理比較難懂，可以先學習后面的實現案例，再結合案例理解登錄認證和訪問授權的執行原理。
登錄認證
登錄認證過濾器
如果在繼承 WebSecurityConfigurerAdapter 的配置類中的 configure(HttpSecurity http) 方法中有配置?HttpSecurity 的?formLogin，則會返回一個?FormLoginConfigurer 對象。如下是一個 Spring Security 的配置樣例，?formLogin().x.x 就是配置使用內置的登錄驗證過濾器，默認實現為?UsernamePasswordAuthenticationFilter。
WebSecurityConfig.java
@Configuration @EnableWebSecurity @EnableGlobalMethodSecurity(prePostEnabled = true) public class WebSecurityConfig extends WebSecurityConfigurerAdapter {@Autowiredprivate UserDetailsService userDetailsService;@Overridepublic void configure(AuthenticationManagerBuilder auth) throws Exception {// 使用自定義身份驗證組件auth.authenticationProvider(new JwtAuthenticationProvider(userDetailsService));}@Overrideprotected void configure(HttpSecurity http) throws Exception {http.cors().and().csrf().disable().authorizeRequests()// 首頁和登錄頁面.antMatchers("/").permitAll()// 其他所有請求需要身份認證 .anyRequest().authenticated()// 配置登錄認證.and().formLogin().loginProcessingUrl("/login");} }查看 HttpSecurity , formLogion 方法返回一個?FormLoginConfigurer 對象。
HttpSecurity.java
public FormLoginConfigurer<HttpSecurity> formLogin() throws Exception {return getOrApply(new FormLoginConfigurer<>());}而 FormLoginConfigurer 的構造函數內綁定了一個?UsernamePasswordAuthenticationFilter 過濾器。
FormLoginConfigurer.java
public FormLoginConfigurer() {super(new UsernamePasswordAuthenticationFilter(), null);usernameParameter("username");passwordParameter("password");}再看?UsernamePasswordAuthenticationFilter 過濾器的構造函數內綁定了 POST 類型的 /login 請求，也就是說，如果配置了 formLogin 的相關信息，那么在使用 POST 類型的 /login URL進行登錄的時候就會被這個過濾器攔截，并進行登錄驗證，登錄驗證過程我們下面繼續分析。
UsernamePasswordAuthenticationFilter.java
public UsernamePasswordAuthenticationFilter() {super(new AntPathRequestMatcher("/login", "POST"));}查看?UsernamePasswordAuthenticationFilter，發現它繼承了?AbstractAuthenticationProcessingFilter，AbstractAuthenticationProcessingFilter 中的?doFilter 包含了觸發登錄認證執行流程的相關邏輯。
AbstractAuthenticationProcessingFilter.java
public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)throws IOException, ServletException {...Authentication authResult;try {authResult = attemptAuthentication(request, response);if (authResult == null) {// return immediately as subclass has indicated that it hasn't completed// authenticationreturn;}sessionStrategy.onAuthentication(authResult, request, response);}
...
successfulAuthentication(request, response, chain, authResult);}
上面的登錄邏輯主要步驟有兩個：
1.?attemptAuthentication(request, response)
這是?AbstractAuthenticationProcessingFilter? 中的一個抽象方法，包含登錄主邏輯，由其子類實現具體的登錄驗證，如 UsernamePasswordAuthenticationFilter 是使用表單方式登錄的具體實現。如果是非表單登錄的方式，如JNDI等其他方式登錄的可以通過繼承?AbstractAuthenticationProcessingFilter 自定義登錄實現。UsernamePasswordAuthenticationFilter 的登錄實現邏輯如下。
UsernamePasswordAuthenticationFilter.java
public Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {if (postOnly && !request.getMethod().equals("POST")) {throw new AuthenticationServiceException("Authentication method not supported: " + request.getMethod());}// 獲取用戶名和密碼String username = obtainUsername(request);String password = obtainPassword(request);if (username == null) {username = "";}if (password == null) {password = "";}username = username.trim();UsernamePasswordAuthenticationToken authRequest = new UsernamePasswordAuthenticationToken(username, password);// Allow subclasses to set the "details" propertysetDetails(request, authRequest);return this.getAuthenticationManager().authenticate(authRequest);}2.?successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain, Authentication authResult)
登錄成功之后，將認證后的 Authentication 對象存儲到請求線程上下文，這樣在授權階段就可以獲取到 Authentication 認證信息，并利用 Authentication 內的權限信息進行訪問控制判斷。
AbstractAuthenticationProcessingFilter.java
protected void successfulAuthentication(HttpServletRequest request,HttpServletResponse response, FilterChain chain, Authentication authResult)throws IOException, ServletException {if (logger.isDebugEnabled()) {logger.debug("Authentication success. Updating SecurityContextHolder to contain: " + authResult);}// 登錄成功之后，把認證后的 Authentication 對象存儲到請求線程上下文，這樣在授權階段就可以獲取到此認證信息進行訪問控制判斷SecurityContextHolder.getContext().setAuthentication(authResult);rememberMeServices.loginSuccess(request, response, authResult);// Fire eventif (this.eventPublisher != null) {eventPublisher.publishEvent(new InteractiveAuthenticationSuccessEvent(authResult, this.getClass()));}successHandler.onAuthenticationSuccess(request, response, authResult);}從上面的登錄邏輯我們可以看到，Spring Security的登錄認證過程是委托給?AuthenticationManager 完成的，它先是解析出用戶名和密碼，然后把用戶名和密碼封裝到一個UsernamePasswordAuthenticationToken 中，傳遞給 AuthenticationManager，交由 AuthenticationManager 完成實際的登錄認證過程。?
AuthenticationManager.java
package org.springframework.security.authentication;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.AuthenticationException;
/**
* Processes an {@link Authentication} request.
* @author Ben Alex
*/
public interface AuthenticationManager {
Authentication authenticate(Authentication authentication) throws AuthenticationException;
}
AuthenticationManager?提供了一個默認的 實現?ProviderManager，而 ProviderManager 又將驗證委托給了 AuthenticationProvider。
ProviderManager.java
public Authentication authenticate(Authentication authentication)throws AuthenticationException {...for (AuthenticationProvider provider : getProviders()) {if (!provider.supports(toTest)) {continue;}try {result = provider.authenticate(authentication);if (result != null) {copyDetails(authentication, result);break;}}
...
}
根據驗證方式的多樣化，AuthenticationProvider 衍生出多種類型的實現，AbstractUserDetailsAuthenticationProvider 是 AuthenticationProvider 的抽象實現，定義了較為統一的驗證邏輯，各種驗證方式可以選擇直接繼承?AbstractUserDetailsAuthenticationProvider 完成登錄認證，如?DaoAuthenticationProvider 就是繼承了此抽象類，完成了從DAO方式獲取驗證需要的用戶信息的。
AbstractUserDetailsAuthenticationProvider.java
public Authentication authenticate(Authentication authentication) throws AuthenticationException {// Determine usernameString username = (authentication.getPrincipal() == null) ? "NONE_PROVIDED" : authentication.getName();boolean cacheWasUsed = true;UserDetails user = this.userCache.getUserFromCache(username);if (user == null) {cacheWasUsed = false;try {// 子類根據自身情況從指定的地方加載認證需要的用戶信息user = retrieveUser(username, (UsernamePasswordAuthenticationToken) authentication);}...try {
// 前置檢查，一般是檢查賬號狀態，如是否鎖定之類preAuthenticationChecks.check(user);
// 進行一般邏輯認證，如 DaoAuthenticationProvider 實現中的密碼驗證就是在這里完成的additionalAuthenticationChecks(user, (UsernamePasswordAuthenticationToken) authentication);}...
// 后置檢查，如可以檢查密碼是否過期之類postAuthenticationChecks.check(user); ...
// 驗證成功之后返回包含完整認證信息的 Authentication 對象return createSuccessAuthentication(principalToReturn, authentication, user);}
如上面所述，?AuthenticationProvider 通過?retrieveUser(String username, UsernamePasswordAuthenticationToken authentication) 獲取驗證信息，對于我們一般所用的?DaoAuthenticationProvider 是由 UserDetailsService 專門負責獲取驗證信息的。
DaoAuthenticationProvider.java
protected final UserDetails retrieveUser(String username, UsernamePasswordAuthenticationToken authentication) throws AuthenticationException {try {UserDetails loadedUser = this.getUserDetailsService().loadUserByUsername(username);if (loadedUser == null) {throw new InternalAuthenticationServiceException("UserDetailsService returned null, which is an interface contract violation");}return loadedUser;}}UserDetailsService 接口只有一個方法，loadUserByUsername(String username)，一般需要我們實現此接口方法，根據用戶名加載登錄認證和訪問授權所需要的信息，并返回一個?UserDetails的實現類，后面登錄認證和訪問授權都需要用到此中的信息。
public interface UserDetailsService {/*** Locates the user based on the username. In the actual implementation, the search* may possibly be case sensitive, or case insensitive depending on how the* implementation instance is configured. In this case, the <code>UserDetails</code>* object that comes back may have a username that is of a different case than what* was actually requested..** @param username the username identifying the user whose data is required.** @return a fully populated user record (never <code>null</code>)** @throws UsernameNotFoundException if the user could not be found or the user has no* GrantedAuthority*/UserDetails loadUserByUsername(String username) throws UsernameNotFoundException; }UserDetails 提供了一個默認實現 User，主要包含用戶名（username）、密碼(password)、權限（authorities）和一些賬號或密碼狀態的標識。
如果默認實現滿足不了你的需求，可以根據需求定制自己的?UserDetails，然后在?UserDetailsService 的?loadUserByUsername 中返回即可。
public class User implements UserDetails, CredentialsContainer {// ~ Instance fields// ================================================================================================private String password;private final String username;private final Set<GrantedAuthority> authorities;private final boolean accountNonExpired;private final boolean accountNonLocked;private final boolean credentialsNonExpired;private final boolean enabled;// ~ Constructors// ===================================================================================================public User(String username, String password,Collection<? extends GrantedAuthority> authorities) {this(username, password, true, true, true, true, authorities);}... }
退出登錄
Spring Security 提供了一個默認的登出過濾器?LogoutFilter，默認攔截路徑是 /logout，當訪問 /logout 路徑的時候，LogoutFilter 會進行退出處理。
LogoutFilter.java
package org.springframework.security.web.authentication.logout; public class LogoutFilter extends GenericFilterBean {// ~ Instance fields// ================================================================================================private RequestMatcher logoutRequestMatcher;private final LogoutHandler handler;private final LogoutSuccessHandler logoutSuccessHandler;// ~ Constructors// ===================================================================================================public LogoutFilter(LogoutSuccessHandler logoutSuccessHandler,LogoutHandler... handlers) {this.handler = new CompositeLogoutHandler(handlers);Assert.notNull(logoutSuccessHandler, "logoutSuccessHandler cannot be null");this.logoutSuccessHandler = logoutSuccessHandler;setFilterProcessesUrl("/logout"); // 綁定 /logout}// ~ Methods// ========================================================================================================public void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)throws IOException, ServletException {HttpServletRequest request = (HttpServletRequest) req;HttpServletResponse response = (HttpServletResponse) res;if (requiresLogout(request, response)) {Authentication auth = SecurityContextHolder.getContext().getAuthentication();this.handler.logout(request, response, auth); // 登出處理，可能包含session、cookie、認證信息的清理工作logoutSuccessHandler.onLogoutSuccess(request, response, auth); // 退出后的操作，可能是跳轉、返回成功狀態等return;}chain.doFilter(request, response);}... }如下是?SecurityContextLogoutHandler 中的登出處理實現。
SecurityContextLogoutHandler.java
public void logout(HttpServletRequest request, HttpServletResponse response,Authentication authentication) {// 讓 session 失效 if (invalidateHttpSession) {HttpSession session = request.getSession(false);if (session != null) {logger.debug("Invalidating session: " + session.getId());session.invalidate();}}// 清理 Security 上下文，其中包含登錄認證信息if (clearAuthentication) {SecurityContext context = SecurityContextHolder.getContext();context.setAuthentication(null);}SecurityContextHolder.clearContext();}?
訪問授權
訪問授權主要分為兩種：通過URL方式的接口訪問控制和方法調用的權限控制。
接口訪問權限
在通過比如瀏覽器使用URL訪問后臺接口時，是否允許訪問此URL，就是接口訪問權限。
在進行接口訪問時，會由?FilterSecurityInterceptor 進行攔截并進行授權。
FilterSecurityInterceptor 繼承了 AbstractSecurityInterceptor 并實現了?javax.servlet.Filter 接口， 所以在URL訪問的時候都會被過濾器攔截，doFilter 實現如下。
FilterSecurityInterceptor.java
public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {FilterInvocation fi = new FilterInvocation(request, response, chain);invoke(fi);}doFilter 方法又調用了自身的?invoke 方法， invoke 方法又調用了父類 AbstractSecurityInterceptor 的 beforeInvocation 方法。
FilterSecurityInterceptor.java
public void invoke(FilterInvocation fi) throws IOException, ServletException {if ((fi.getRequest() != null)&& (fi.getRequest().getAttribute(FILTER_APPLIED) != null)&& observeOncePerRequest) {// filter already applied to this request and user wants us to observe// once-per-request handling, so don't re-do security checking fi.getChain().doFilter(fi.getRequest(), fi.getResponse());}else {// first time this request being called, so perform security checkingif (fi.getRequest() != null && observeOncePerRequest) {fi.getRequest().setAttribute(FILTER_APPLIED, Boolean.TRUE);}InterceptorStatusToken token = super.beforeInvocation(fi);try {fi.getChain().doFilter(fi.getRequest(), fi.getResponse());}finally {super.finallyInvocation(token);}super.afterInvocation(token, null);}}方法調用權限
在進行后臺方法調用時，是否允許該方法調用，就是方法調用權限。比如在方法上添加了此類注解 @PreAuthorize("hasRole('ROLE_ADMIN')") ，Security 方法注解的支持需要在任何配置類中（如 WebSecurityConfigurerAdapter?）添加 @EnableGlobalMethodSecurity(prePostEnabled = true) 開啟，才能夠使用。
@Configuration @EnableWebSecurity @EnableGlobalMethodSecurity(prePostEnabled = true) public class WebSecurityConfig extends WebSecurityConfigurerAdapter {}在進行方法調用時，會由 MethodSecurityInterceptor 進行攔截并進行授權。
MethodSecurityInterceptor 繼承了?AbstractSecurityInterceptor 并實現了AOP 的 org.aopalliance.intercept.MethodInterceptor 接口， 所以可以在方法調用時進行攔截。
MethodSecurityInterceptor?.java
public Object invoke(MethodInvocation mi) throws Throwable {InterceptorStatusToken token = super.beforeInvocation(mi);Object result;try {result = mi.proceed();}finally {super.finallyInvocation(token);}return super.afterInvocation(token, result);}我們看到，MethodSecurityInterceptor 跟 FilterSecurityInterceptor 一樣， 都是通過調用父類 AbstractSecurityInterceptor 的相關方法完成授權，其中 beforeInvocation 是完成權限認證的關鍵。
AbstractSecurityInterceptor.java
protected InterceptorStatusToken beforeInvocation(Object object) {...// 通過 SecurityMetadataSource 獲取權限配置信息，可以定制實現自己的權限信息獲取邏輯Collection<ConfigAttribute> attributes = this.obtainSecurityMetadataSource().getAttributes(object); ...// 確認是否經過登錄認證 Authentication authenticated = authenticateIfRequired();// Attempt authorizationtry {
// 通過 AccessDecisionManager 完成授權認證，默認實現是 AffirmativeBasedthis.accessDecisionManager.decide(authenticated, object, attributes);}...}
上面代碼顯示 AbstractSecurityInterceptor 又是委托授權認證器 AccessDecisionManager 完成授權認證，默認實現是 AffirmativeBased，?decide 方法實現如下。
AffirmativeBased.java
public void decide(Authentication authentication, Object object,Collection<ConfigAttribute> configAttributes) throws AccessDeniedException {int deny = 0;for (AccessDecisionVoter voter : getDecisionVoters()) {
// 通過各種投票策略，最終決定是否授權 int result = voter.vote(authentication, object, configAttributes); switch (result) {
case AccessDecisionVoter.ACCESS_GRANTED:return;
case AccessDecisionVoter.ACCESS_DENIED:deny++;break;
default:break;}...}
而?AccessDecisionManager 決定授權又是通過一個授權策略集合（AccessDecisionVoter?）決定的，授權決定的原則是：
? 1. 遍歷所有授權策略， 如果有其中一個返回?ACCESS_GRANTED，則同意授權。
? 2. 否則，等待遍歷結束，統計?ACCESS_DENIED 個數，只要拒絕數大于1，則不同意授權。
對于接口訪問授權，也就是 FilterSecurityInterceptor 管理的URL授權，默認對應的授權策略只有一個，就是?WebExpressionVoter，它的授權策略主要是根據 WebSecurityConfigurerAdapter 內配置的路徑訪問策略進行匹配，然后決定是否授權。
WebExpressionVoter.java
/*** Voter which handles web authorisation decisions.* @author Luke Taylor* @since 3.0*/ public class WebExpressionVoter implements AccessDecisionVoter<FilterInvocation> {private SecurityExpressionHandler<FilterInvocation> expressionHandler = new DefaultWebSecurityExpressionHandler();public int vote(Authentication authentication, FilterInvocation fi,Collection<ConfigAttribute> attributes) {assert authentication != null;assert fi != null;assert attributes != null;WebExpressionConfigAttribute weca = findConfigAttribute(attributes);if (weca == null) {return ACCESS_ABSTAIN;}EvaluationContext ctx = expressionHandler.createEvaluationContext(authentication, fi);ctx = weca.postProcess(ctx, fi);return ExpressionUtils.evaluateAsBoolean(weca.getAuthorizeExpression(), ctx) ? ACCESS_GRANTED : ACCESS_DENIED;}... }
對于方法調用授權，在全局方法安全配置類里，可以看到給?MethodSecurityInterceptor 默認配置的有?RoleVoter、AuthenticatedVoter、Jsr250Voter、和?PreInvocationAuthorizationAdviceVoter，其中?Jsr250Voter、PreInvocationAuthorizationAdviceVoter 都需要打開指定的開關，才會添加支持。
GlobalMethodSecurityConfiguration.java
@Configuration public class GlobalMethodSecurityConfiguration implements ImportAware, SmartInitializingSingleton {...
private MethodSecurityInterceptor methodSecurityInterceptor;
@Beanpublic MethodInterceptor methodSecurityInterceptor() throws Exception {this.methodSecurityInterceptor = isAspectJ()? new AspectJMethodSecurityInterceptor(): new MethodSecurityInterceptor();methodSecurityInterceptor.setAccessDecisionManager(accessDecisionManager());methodSecurityInterceptor.setAfterInvocationManager(afterInvocationManager());methodSecurityInterceptor.setSecurityMetadataSource(methodSecurityMetadataSource());RunAsManager runAsManager = runAsManager();if (runAsManager != null) {methodSecurityInterceptor.setRunAsManager(runAsManager);}return this.methodSecurityInterceptor;}protected AccessDecisionManager accessDecisionManager() {List<AccessDecisionVoter<? extends Object>> decisionVoters = new ArrayList<AccessDecisionVoter<? extends Object>>();ExpressionBasedPreInvocationAdvice expressionAdvice = new ExpressionBasedPreInvocationAdvice();expressionAdvice.setExpressionHandler(getExpressionHandler());if (prePostEnabled()) {decisionVoters.add(new PreInvocationAuthorizationAdviceVoter(expressionAdvice));}if (jsr250Enabled()) {decisionVoters.add(new Jsr250Voter());}decisionVoters.add(new RoleVoter());decisionVoters.add(new AuthenticatedVoter());return new AffirmativeBased(decisionVoters);}
...
}
RoleVoter 是根據角色進行匹配授權的策略。
RoleVoter.java
public class RoleVoter implements AccessDecisionVoter<Object> {// RoleVoter? 默認角色名以?"ROLE_" 為前綴。private String rolePrefix = "ROLE_";public boolean supports(ConfigAttribute attribute) {if ((attribute.getAttribute() != null)&& attribute.getAttribute().startsWith(getRolePrefix())) {return true;}else {return false;}}public int vote(Authentication authentication, Object object,Collection<ConfigAttribute> attributes) {if(authentication == null) {return ACCESS_DENIED;}int result = ACCESS_ABSTAIN;Collection<? extends GrantedAuthority> authorities = extractAuthorities(authentication);// 逐個角色進行匹配，入股有一個匹配得上，則進行授權for (ConfigAttribute attribute : attributes) {if (this.supports(attribute)) {result = ACCESS_DENIED;// Attempt to find a matching granted authorityfor (GrantedAuthority authority : authorities) {if (attribute.getAttribute().equals(authority.getAuthority())) {return ACCESS_GRANTED;}}}}return result;}Collection<? extends GrantedAuthority> extractAuthorities(Authentication authentication) {return authentication.getAuthorities();} }
AuthenticatedVoter 主要是針對有配置以下幾個屬性來決定授權的策略。
IS_AUTHENTICATED_REMEMBERED：記住我登錄狀態
IS_AUTHENTICATED_ANONYMOUSLY：匿名認證狀態
IS_AUTHENTICATED_FULLY： 完全登錄狀態，即非上面兩種類型
AuthenticatedVoter.java
public int vote(Authentication authentication, Object object,Collection<ConfigAttribute> attributes) {int result = ACCESS_ABSTAIN;for (ConfigAttribute attribute : attributes) {if (this.supports(attribute)) {result = ACCESS_DENIED;// 完全登錄狀態if (IS_AUTHENTICATED_FULLY.equals(attribute.getAttribute())) {if (isFullyAuthenticated(authentication)) {return ACCESS_GRANTED;}}// 記住我登錄狀態if (IS_AUTHENTICATED_REMEMBERED.equals(attribute.getAttribute())) {if (authenticationTrustResolver.isRememberMe(authentication)|| isFullyAuthenticated(authentication)) {return ACCESS_GRANTED;}}// 匿名登錄狀態if (IS_AUTHENTICATED_ANONYMOUSLY.equals(attribute.getAttribute())) {if (authenticationTrustResolver.isAnonymous(authentication)|| isFullyAuthenticated(authentication)|| authenticationTrustResolver.isRememberMe(authentication)) {return ACCESS_GRANTED;}}}}return result;}PreInvocationAuthorizationAdviceVoter 是針對類似??@PreAuthorize("hasRole('ROLE_ADMIN')")? 注解解析并進行授權的策略。
PreInvocationAuthorizationAdviceVoter.java
public class PreInvocationAuthorizationAdviceVoter implements AccessDecisionVoter<MethodInvocation> {private final PreInvocationAuthorizationAdvice preAdvice; public int vote(Authentication authentication, MethodInvocation method,Collection<ConfigAttribute> attributes) { PreInvocationAttribute preAttr = findPreInvocationAttribute(attributes);if (preAttr == null) {// No expression based metadata, so abstainreturn ACCESS_ABSTAIN;}boolean allowed = preAdvice.before(authentication, method, preAttr);return allowed ? ACCESS_GRANTED : ACCESS_DENIED;}private PreInvocationAttribute findPreInvocationAttribute(Collection<ConfigAttribute> config) {for (ConfigAttribute attribute : config) {if (attribute instanceof PreInvocationAttribute) {return (PreInvocationAttribute) attribute;}}return null;} }PreInvocationAuthorizationAdviceVoter 解析出注解屬性配置， 然后通過調用 PreInvocationAuthorizationAdvice 的前置通知方法進行授權認證，默認實現類似?ExpressionBasedPreInvocationAdvice，通知內主要進行了內容的過濾和權限表達式的匹配。
ExpressionBasedPreInvocationAdvice.java
public class ExpressionBasedPreInvocationAdvice implements PreInvocationAuthorizationAdvice {private MethodSecurityExpressionHandler expressionHandler = new DefaultMethodSecurityExpressionHandler();public boolean before(Authentication authentication, MethodInvocation mi, PreInvocationAttribute attr) {PreInvocationExpressionAttribute preAttr = (PreInvocationExpressionAttribute) attr;EvaluationContext ctx = expressionHandler.createEvaluationContext(authentication, mi);Expression preFilter = preAttr.getFilterExpression();Expression preAuthorize = preAttr.getAuthorizeExpression();if (preFilter != null) {Object filterTarget = findFilterTarget(preAttr.getFilterTarget(), ctx, mi);expressionHandler.filter(filterTarget, preFilter, ctx);}if (preAuthorize == null) {return true;}return ExpressionUtils.evaluateAsBoolean(preAuthorize, ctx);}... }案例實現
接下來，我們以一個實現案例來進行說明講解。
新建工程
新建一個 Spring Boot 項目?springboot-spring-security。
添加依賴
添加項目依賴，主要是 Spring Security 和 JWT，另外添加 Swagger 和 fastjson 作為輔助工具。
pom.xml
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>top.ivan.demo</groupId><artifactId>springboot-spring-security</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>springboot-spring-security</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>2.0.4.RELEASE</version><relativePath/> <!-- lookup parent from repository --></parent><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding><java.version>1.8</java.version><mybatis.spring.version>1.3.2</mybatis.spring.version><swagger.version>2.8.0</swagger.version><jwt.version>0.9.1</jwt.version><fastjson.version>1.2.48</fastjson.version></properties><dependencies><!-- spring boot --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><!-- swagger --><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger2</artifactId><version>${swagger.version}</version></dependency><dependency><groupId>io.springfox</groupId><artifactId>springfox-swagger-ui</artifactId><version>${swagger.version}</version></dependency><!-- spring security --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-security</artifactId></dependency><!-- jwt --><dependency><groupId>io.jsonwebtoken</groupId><artifactId>jjwt</artifactId><version>${jwt.version}</version></dependency><!-- fastjson --><dependency><groupId>com.alibaba</groupId><artifactId>fastjson</artifactId><version>${fastjson.version}</version></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>啟動類
啟動類沒什么，主要開啟以下包掃描。
SpringSecurityApplication.java
package com.louis.springboot.spring.security;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.ComponentScan;/*** 啟動器* @author Louis* @date Nov 28, 2018*/ @SpringBootApplication @ComponentScan(basePackages = "com.louis.springboot") public class SpringSecurityApplication {public static void main(String[] args) {SpringApplication.run(SpringSecurityApplication.class, args);} }跨域配置類
跨域配置類，不多說，都懂得。
CorsConfig.java
package com.louis.springboot.spring.security.config;import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.CorsRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer;/*** 跨域配置* @author Louis* @date Nov 28, 2018*/ @Configuration public class CorsConfig implements WebMvcConfigurer {@Overridepublic void addCorsMappings(CorsRegistry registry) {registry.addMapping("/**") // 允許跨域訪問的路徑.allowedOrigins("*") // 允許跨域訪問的源.allowedMethods("POST", "GET", "PUT", "OPTIONS", "DELETE") // 允許請求方法.maxAge(168000) // 預檢間隔時間.allowedHeaders("*") // 允許頭部設置.allowCredentials(true); // 是否發送cookie } }Swagger配置類
Swagger配置類，除了常規配置外，加了一個令牌屬性，可以在接口調用的時候傳遞令牌。
SwaggerConfig.java
package com.louis.springboot.spring.security.config; import java.util.ArrayList; import java.util.List;import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration;import springfox.documentation.builders.ApiInfoBuilder; import springfox.documentation.builders.ParameterBuilder; import springfox.documentation.builders.PathSelectors; import springfox.documentation.builders.RequestHandlerSelectors; import springfox.documentation.schema.ModelRef; import springfox.documentation.service.ApiInfo; import springfox.documentation.service.Parameter; import springfox.documentation.spi.DocumentationType; import springfox.documentation.spring.web.plugins.Docket; import springfox.documentation.swagger2.annotations.EnableSwagger2;/*** Swagger配置* @author Louis* @date Nov 28, 2018*/ @Configuration @EnableSwagger2 public class SwaggerConfig {@Beanpublic Docket createRestApi(){// 添加請求參數，我們這里把token作為請求頭部參數傳入后端ParameterBuilder parameterBuilder = new ParameterBuilder();List<Parameter> parameters = new ArrayList<Parameter>();parameterBuilder.name("Authorization").description("令牌").modelRef(new ModelRef("string")).parameterType("header").required(false).build();parameters.add(parameterBuilder.build());return new Docket(DocumentationType.SWAGGER_2).apiInfo(apiInfo()).select().apis(RequestHandlerSelectors.any()).paths(PathSelectors.any()).build().globalOperationParameters(parameters);}private ApiInfo apiInfo(){return new ApiInfoBuilder().build();}}加了令牌屬性后的 Swagger 接口調用界面。
安全配置類
下面這個配置類是Spring Security的關鍵配置。
在這個配置類中，我們主要做了以下幾個配置：
1. 訪問路徑URL的授權策略，如登錄、Swagger訪問免登錄認證等
2. 指定了登錄認證流程過濾器?JwtLoginFilter，由它來觸發登錄認證
3. 指定了自定義身份認證組件?JwtAuthenticationProvider，并注入?UserDetailsService
4. 指定了訪問控制過濾器?JwtAuthenticationFilter，在授權時解析令牌和設置登錄狀態
5. 指定了退出登錄處理器，因為是前后端分離，防止內置的登錄處理器在后臺進行跳轉
WebSecurityConfig.java
package com.louis.springboot.spring.security.config;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; import org.springframework.http.HttpMethod; import org.springframework.security.authentication.AuthenticationManager; import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder; import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity; import org.springframework.security.config.annotation.web.builders.HttpSecurity; import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity; import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter; import org.springframework.security.core.userdetails.UserDetailsService; import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter; import org.springframework.security.web.authentication.logout.HttpStatusReturningLogoutSuccessHandler;import com.louis.springboot.spring.security.security.JwtAuthenticationFilter; import com.louis.springboot.spring.security.security.JwtAuthenticationProvider; import com.louis.springboot.spring.security.security.JwtLoginFilter;/*** Security Config* @author Louis* @date Nov 28, 2018*/ @Configuration @EnableWebSecurity @EnableGlobalMethodSecurity(prePostEnabled = true) public class WebSecurityConfig extends WebSecurityConfigurerAdapter {@Autowiredprivate UserDetailsService userDetailsService;@Overridepublic void configure(AuthenticationManagerBuilder auth) throws Exception {// 使用自定義登錄身份認證組件auth.authenticationProvider(new JwtAuthenticationProvider(userDetailsService));}@Overrideprotected void configure(HttpSecurity http) throws Exception {// 禁用 csrf, 由于使用的是JWT，我們這里不需要csrf http.cors().and().csrf().disable().authorizeRequests()// 跨域預檢請求.antMatchers(HttpMethod.OPTIONS, "/**").permitAll()// 登錄URL.antMatchers("/login").permitAll()// swagger.antMatchers("/swagger-ui.html").permitAll().antMatchers("/swagger-resources").permitAll().antMatchers("/v2/api-docs").permitAll().antMatchers("/webjars/springfox-swagger-ui/**").permitAll()// 其他所有請求需要身份認證 .anyRequest().authenticated();// 退出登錄處理器http.logout().logoutSuccessHandler(new HttpStatusReturningLogoutSuccessHandler());// 開啟登錄認證流程過濾器http.addFilterBefore(new JwtLoginFilter(authenticationManager()), UsernamePasswordAuthenticationFilter.class);// 訪問控制時登錄狀態檢查過濾器http.addFilterBefore(new JwtAuthenticationFilter(authenticationManager()), UsernamePasswordAuthenticationFilter.class);}@Bean@Overridepublic AuthenticationManager authenticationManager() throws Exception {return super.authenticationManager();}}登錄認證觸發過濾器
JwtLoginFilter 是在通過訪問 /login 的POST請求是被首先被觸發的過濾器，默認實現是?UsernamePasswordAuthenticationFilter，它繼承了 AbstractAuthenticationProcessingFilter，抽象父類的 doFilter 定義了登錄認證的大致操作流程，這里我們的 JwtLoginFilter 繼承了 UsernamePasswordAuthenticationFilter，并進行了兩個主要內容的定制。
1. 覆寫認證方法，修改用戶名、密碼的獲取方式，具體原因看代碼注釋
2. 覆寫認證成功后的操作，移除后臺跳轉，添加生成令牌并返回給客戶端
JwtLoginFilter.java
package com.louis.springboot.spring.security.security;import java.io.BufferedReader; import java.io.IOException; import java.io.InputStream; import java.io.InputStreamReader; import java.nio.charset.Charset;import javax.servlet.FilterChain; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import org.springframework.security.authentication.AuthenticationManager; import org.springframework.security.authentication.event.InteractiveAuthenticationSuccessEvent; import org.springframework.security.core.Authentication; import org.springframework.security.core.AuthenticationException; import org.springframework.security.core.context.SecurityContextHolder; import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;import com.alibaba.fastjson.JSON; import com.alibaba.fastjson.JSONObject; import com.louis.springboot.spring.security.utils.HttpUtils; import com.louis.springboot.spring.security.utils.JwtTokenUtils;/*** 啟動登錄認證流程過濾器* @author Louis* @date Nov 28, 2018*/ public class JwtLoginFilter extends UsernamePasswordAuthenticationFilter {public JwtLoginFilter(AuthenticationManager authManager) {setAuthenticationManager(authManager);}@Overridepublic void doFilter(ServletRequest req, ServletResponse res, FilterChain chain)throws IOException, ServletException {// POST 請求 /login 登錄時攔截， 由此方法觸發執行登錄認證流程，可以在此覆寫整個登錄認證邏輯super.doFilter(req, res, chain); }@Overridepublic Authentication attemptAuthentication(HttpServletRequest request, HttpServletResponse response) throws AuthenticationException {// 可以在此覆寫嘗試進行登錄認證的邏輯，登錄成功之后等操作不再此方法內// 如果使用此過濾器來觸發登錄認證流程，注意登錄請求數據格式的問題// 此過濾器的用戶名密碼默認從request.getParameter()獲取，但是這種// 讀取方式不能讀取到如 application/json 等 post 請求數據，需要把// 用戶名密碼的讀取邏輯修改為到流中讀取request.getInputStream() String body = getBody(request);JSONObject jsonObject = JSON.parseObject(body);String username = jsonObject.getString("username");String password = jsonObject.getString("password");if (username == null) {username = "";}if (password == null) {password = "";}username = username.trim();JwtAuthenticatioToken authRequest = new JwtAuthenticatioToken(username, password);// Allow subclasses to set the "details" property setDetails(request, authRequest);return this.getAuthenticationManager().authenticate(authRequest);}@Overrideprotected void successfulAuthentication(HttpServletRequest request, HttpServletResponse response, FilterChain chain,Authentication authResult) throws IOException, ServletException {// 存儲登錄認證信息到上下文 SecurityContextHolder.getContext().setAuthentication(authResult);// 記住我服務 getRememberMeServices().loginSuccess(request, response, authResult);// 觸發事件監聽器if (this.eventPublisher != null) {eventPublisher.publishEvent(new InteractiveAuthenticationSuccessEvent(authResult, this.getClass()));}// 生成并返回token給客戶端，后續訪問攜帶此tokenJwtAuthenticatioToken token = new JwtAuthenticatioToken(null, null, JwtTokenUtils.generateToken(authResult));HttpUtils.write(response, token);}/**?* 獲取請求Body* @param request* @return*/public String getBody(HttpServletRequest request) {StringBuilder sb = new StringBuilder();InputStream inputStream = null;BufferedReader reader = null;try {inputStream = request.getInputStream();reader = new BufferedReader(new InputStreamReader(inputStream, Charset.forName("UTF-8")));String line = "";while ((line = reader.readLine()) != null) {sb.append(line);}} catch (IOException e) {e.printStackTrace();} finally {if (inputStream != null) {try {inputStream.close();} catch (IOException e) {e.printStackTrace();}}if (reader != null) {try {reader.close();} catch (IOException e) {e.printStackTrace();}}}return sb.toString();} }登錄控制器
除了使用上面的登錄認證過濾器攔截 /login Post請求之外，我們也可以不使用上面的過濾器，通過自定義登錄接口實現，只要在登錄接口手動觸發登錄流程并生產令牌即可。
其實 Spring Security 的登錄認證過程只需 調用?AuthenticationManager 的?authenticate(Authentication authentication) 方法，最終返回認證成功的?Authentication 實現類并存儲到SpringContexHolder 上下文即可，這樣后面授權的時候就可以從 SpringContexHolder 中獲取登錄認證信息，并根據其中的用戶信息和權限信息決定是否進行授權。
LoginController.java
package com.louis.springboot.spring.security.controller;import java.io.IOException;import javax.servlet.http.HttpServletRequest;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.security.authentication.AuthenticationManager; import org.springframework.web.bind.annotation.PostMapping; import org.springframework.web.bind.annotation.RequestBody; import org.springframework.web.bind.annotation.RestController;import com.louis.springboot.spring.security.security.JwtAuthenticatioToken; import com.louis.springboot.spring.security.utils.SecurityUtils; import com.louis.springboot.spring.security.vo.HttpResult; import com.louis.springboot.spring.security.vo.LoginBean;/*** 登錄控制器* @author Louis* @date Nov 28, 2018*/ @RestController public class LoginController {@Autowiredprivate AuthenticationManager authenticationManager;/*** 登錄接口*/@PostMapping(value = "/login")public HttpResult login(@RequestBody LoginBean loginBean, HttpServletRequest request) throws IOException {String username = loginBean.getUsername();String password = loginBean.getPassword();// 系統登錄認證JwtAuthenticatioToken token = SecurityUtils.login(request, username, password, authenticationManager);return HttpResult.ok(token);}}注意：如果使用此登錄控制器觸發登錄認證，需要禁用登錄認證過濾器，即將?WebSecurityConfig 中的以下配置項注釋即可，否則訪問登錄接口會被過濾攔截，執行不會再進入此登錄接口，大家根據使用習慣二選一即可。
// 開啟登錄認證流程過濾器，如果使用LoginController的login接口, 需要注釋掉此過濾器，根據使用習慣二選一即可 http.addFilterBefore(new JwtLoginFilter(authenticationManager()), UsernamePasswordAuthenticationFilter.class);如下是登錄認證的邏輯， 可以看到部分邏輯跟上面的登錄認證過濾器差不多。
1.?執行登錄認證過程，通過調用 AuthenticationManager 的 authenticate(token) 方法實現
2. 將認證成功的認證信息存儲到上下文，供后續訪問授權的時候獲取使用
3. 通過JWT生成令牌并返回給客戶端，后續訪問和操作都需要攜帶此令牌
SecurityUtils.java
/*** Security相關操作* @author Louis* @date Nov 28, 2018*/ public class SecurityUtils {/*** 系統登錄認證* @param request* @param username* @param password* @param authenticationManager* @return*/public static JwtAuthenticatioToken login(HttpServletRequest request, String username, String password, AuthenticationManager authenticationManager) {JwtAuthenticatioToken token = new JwtAuthenticatioToken(username, password);token.setDetails(new WebAuthenticationDetailsSource().buildDetails(request));// 執行登錄認證過程Authentication authentication = authenticationManager.authenticate(token);// 認證成功存儲認證信息到上下文 SecurityContextHolder.getContext().setAuthentication(authentication);// 生成令牌并返回給客戶端 token.setToken(JwtTokenUtils.generateToken(authentication));return token;}...
}
令牌生成器
我們令牌是使用JWT生成的，下面是令牌生成的簡要邏輯，詳細參見源碼。
JwtTokenUtils.java
/*** JWT工具類* @author Louis* @date Nov 28, 2018*/ public class JwtTokenUtils implements Serializable {.../*** 生成令牌** @param userDetails 用戶* @return 令牌*/public static String generateToken(Authentication authentication) {Map<String, Object> claims = new HashMap<>(3);claims.put(USERNAME, SecurityUtils.getUsername(authentication));claims.put(CREATED, new Date());claims.put(AUTHORITIES, authentication.getAuthorities());return generateToken(claims);}/*** 從數據聲明生成令牌** @param claims 數據聲明* @return 令牌*/private static String generateToken(Map<String, Object> claims) {Date expirationDate = new Date(System.currentTimeMillis() + EXPIRE_TIME);return Jwts.builder().setClaims(claims).setExpiration(expirationDate).signWith(SignatureAlgorithm.HS512, SECRET).compact();}...}登錄身份認證組件
上面說到登錄認證是通過調用 AuthenticationManager 的 authenticate(token) 方法實現的，而?AuthenticationManager 又是通過調用?AuthenticationProvider 的?authenticate(Authentication authentication) 來完成認證的，所以通過定制?AuthenticationProvider 也可以完成各種自定義的需求，我們這里只是簡單的繼承?DaoAuthenticationProvider 展示如何自定義，具體的大家可以根據各自的需求按需定制。
JwtAuthenticationProvider.java
package com.louis.springboot.spring.security.security;import org.springframework.security.authentication.UsernamePasswordAuthenticationToken; import org.springframework.security.authentication.dao.DaoAuthenticationProvider; import org.springframework.security.core.Authentication; import org.springframework.security.core.AuthenticationException; import org.springframework.security.core.userdetails.UserDetails; import org.springframework.security.core.userdetails.UserDetailsService; import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;/*** 身份驗證提供者* @author Louis* @date Nov 20, 2018*/ public class JwtAuthenticationProvider extends DaoAuthenticationProvider {public JwtAuthenticationProvider(UserDetailsService userDetailsService) {setUserDetailsService(userDetailsService);setPasswordEncoder(new BCryptPasswordEncoder());}@Overridepublic Authentication authenticate(Authentication authentication) throws AuthenticationException {// 可以在此處覆寫整個登錄認證邏輯return super.authenticate(authentication);}@Overrideprotected void additionalAuthenticationChecks(UserDetails userDetails, UsernamePasswordAuthenticationToken authentication)throws AuthenticationException {// 可以在此處覆寫密碼驗證邏輯super.additionalAuthenticationChecks(userDetails, authentication);}}認證信息獲取服務
通過跟蹤代碼運行，我們發現像默認使用的?DaoAuthenticationProvider，在認證的使用都是通過一個叫?UserDetailsService 的來獲取用戶認證所需信息的。
AbstractUserDetailsAuthenticationProvider 定義了在 authenticate 方法中通過?retrieveUser 方法獲取用戶信息，子類?DaoAuthenticationProvider 通過?UserDetailsService 來進行獲取， 一般情況，這個?UserDetailsService 需要我們自定義，實現從用戶服務獲取用戶和權限信息封裝到?UserDetails 的實現類。
AbstractUserDetailsAuthenticationProvider.java
public Authentication authenticate(Authentication authentication) throws AuthenticationException {...if (user == null) {cacheWasUsed = false;try {user = retrieveUser(username, (UsernamePasswordAuthenticationToken) authentication);}...return createSuccessAuthentication(principalToReturn, authentication, user);}
DaoAuthenticationProvider.java
protected final UserDetails retrieveUser(String username, UsernamePasswordAuthenticationToken authentication)throws AuthenticationException {try {UserDetails loadedUser = this.getUserDetailsService().loadUserByUsername(username);return loadedUser;}...}
我們自定義的?UserDetailsService，從我們的用戶服務?UserService 中獲取用戶和權限信息。
UserDetailsServiceImpl.java
package com.louis.springboot.spring.security.security; import java.util.List; import java.util.Set; import java.util.stream.Collectors;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.security.core.GrantedAuthority; import org.springframework.security.core.userdetails.UserDetails; import org.springframework.security.core.userdetails.UserDetailsService; import org.springframework.security.core.userdetails.UsernameNotFoundException; import org.springframework.stereotype.Service;import com.louis.springboot.spring.security.model.User; import com.louis.springboot.spring.security.service.UserService;/*** 用戶登錄認證信息查詢* @author Louis* @date Nov 20, 2018*/ @Service public class UserDetailsServiceImpl implements UserDetailsService {@Autowiredprivate UserService userService;@Overridepublic UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {User user = userService.findByUsername(username);if (user == null) {throw new UsernameNotFoundException("該用戶不存在");}// 用戶權限列表，根據用戶擁有的權限標識與如 @PreAuthorize("hasAuthority('sys:menu:view')") 標注的接口對比，決定是否可以調用接口Set<String> permissions = userService.findPermissions(username);List<GrantedAuthority> grantedAuthorities = permissions.stream().map(GrantedAuthorityImpl::new).collect(Collectors.toList());return new JwtUserDetails(username, user.getPassword(), grantedAuthorities);} }一般而言，定制?UserDetailsService?就可以滿足大部分需求了，在?UserDetailsService?滿足不了我們的需求的時候考慮定制?AuthenticationProvider。
如果直接定制UserDetailsService?，而不自定義 AuthenticationProvider，可以直接在配置文件 WebSecurityConfig 中這樣配置。
WebSecurityConfig.java
@Overridepublic void configure(AuthenticationManagerBuilder auth) throws Exception {// 指定自定義的獲取信息獲取服務 auth.userDetailsService(userDetailsService)}用戶認證信息
上面 UserDetailsService 加載好用戶認證信息后會封裝認證信息到一個 UserDetails 的實現類。
默認實現是 User 類，我們這里沒有特殊需要，簡單繼承即可，復雜需求可以在此基礎上進行拓展。
JwtUserDetails.java
package com.louis.springboot.spring.security.security; import java.util.Collection;import org.springframework.security.core.GrantedAuthority; import org.springframework.security.core.userdetails.User;/*** 安全用戶模型* @author Louis* @date Nov 28, 2018*/ public class JwtUserDetails extends User {private static final long serialVersionUID = 1L;public JwtUserDetails(String username, String password, Collection<? extends GrantedAuthority> authorities) {this(username, password, true, true, true, true, authorities);}public JwtUserDetails(String username, String password, boolean enabled, boolean accountNonExpired,boolean credentialsNonExpired, boolean accountNonLocked, Collection<? extends GrantedAuthority> authorities) {super(username, password, enabled, accountNonExpired, credentialsNonExpired, accountNonLocked, authorities);}}用戶操作代碼
簡單的用戶模型，包含用戶名密碼。
User.java
package com.louis.springboot.spring.security.model;/*** 用戶模型* @author Louis* @date Nov 28, 2018*/ public class User {private Long id;private String username;private String password;...}用戶服務接口，只提供簡單的用戶查詢和權限查詢接口用于模擬。
UserService.java
/*** 用戶管理* @author Louis* @date Nov 28, 2018*/ public interface UserService {/*** 根據用戶名查找用戶* @param username* @return*/User findByUsername(String username);/*** 查找用戶的菜單權限標識集合* @param userName* @return*/Set<String> findPermissions(String username);}用戶服務實現，只簡單獲取返回模擬數據，實際場景根據情況從DAO獲取即可。
SysUserServiceImpl.java
@Service public class SysUserServiceImpl implements UserService {@Overridepublic User findByUsername(String username) {User user = new User();user.setId(1L);user.setUsername(username);String password = new BCryptPasswordEncoder().encode("123");user.setPassword(password);return user;}@Overridepublic Set<String> findPermissions(String username) {Set<String> permissions = new HashSet<>();permissions.add("sys:user:view");permissions.add("sys:user:add");permissions.add("sys:user:edit");return permissions;}}用戶控制器，提供三個測試接口，其中權限列表中未包含刪除接口定義的權限（'sys:user:delete'），登錄之后也將無權限調用。
UserController.java
/*** 用戶控制器* @author Louis * @date Oct 31, 2018*/ @RestController @RequestMapping("user") public class UserController {@PreAuthorize("hasAuthority('sys:user:view')")@GetMapping(value="/findAll")public HttpResult findAll() {return HttpResult.ok("the findAll service is called success.");}@PreAuthorize("hasAuthority('sys:user:edit')")@GetMapping(value="/edit")public HttpResult edit() {return HttpResult.ok("the edit service is called success.");}@PreAuthorize("hasAuthority('sys:user:delete')")@GetMapping(value="/delete")public HttpResult delete() {return HttpResult.ok("the delete service is called success.");}}登錄認證檢查過濾器
訪問接口的時候，登錄認證檢查過濾器 JwtAuthenticationFilter 會攔截請求校驗令牌和登錄狀態，并根據情況設置登錄狀態。
JwtAuthenticationFilter.java
/*** 登錄認證檢查過濾器* @author Louis* @date Nov 20, 2018*/ public class JwtAuthenticationFilter extends BasicAuthenticationFilter {@Autowiredpublic JwtAuthenticationFilter(AuthenticationManager authenticationManager) {super(authenticationManager);}@Overrideprotected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain chain) throws IOException, ServletException {// 獲取token, 并檢查登錄狀態 SecurityUtils.checkAuthentication(request);chain.doFilter(request, response);}}SecurityUtils.java
/*** 獲取令牌進行認證* @param request*/public static void checkAuthentication(HttpServletRequest request) {// 獲取令牌并根據令牌獲取登錄認證信息Authentication authentication = JwtTokenUtils.getAuthenticationeFromToken(request);// 設置登錄認證信息到上下文 SecurityContextHolder.getContext().setAuthentication(authentication);}JwtTokenUtils.java
/*** 根據請求令牌獲取登錄認證信息* @param token 令牌* @return 用戶名*/public static Authentication getAuthenticationeFromToken(HttpServletRequest request) {Authentication authentication = null;// 獲取請求攜帶的令牌String token = JwtTokenUtils.getToken(request);if(token != null) {// 請求令牌不能為空if(SecurityUtils.getAuthentication() == null) {// 上下文中Authentication為空Claims claims = getClaimsFromToken(token);if(claims == null) {return null;}String username = claims.getSubject();if(username == null) {return null;}if(isTokenExpired(token)) {return null;}Object authors = claims.get(AUTHORITIES);List<GrantedAuthority> authorities = new ArrayList<GrantedAuthority>();if (authors != null && authors instanceof List) {for (Object object : (List) authors) {authorities.add(new GrantedAuthorityImpl((String) ((Map) object).get("authority")));}}authentication = new JwtAuthenticatioToken(username, null, authorities, token);} else {if(validateToken(token, SecurityUtils.getUsername())) {// 如果上下文中Authentication非空，且請求令牌合法，直接返回當前登錄認證信息authentication = SecurityUtils.getAuthentication();}}}return authentication;}接口測試
找到 SpringSecurityApplication， 啟動程序， 訪問?http://localhost:8080/swagger-ui.html，進入Swagger。
?
我們先再未登錄沒有令牌的時候直接訪問接口，發現都返回無權限，禁止訪問的結果。
返回拒絕訪問結果。
?打開 LoginController，輸入我們用戶名和密碼（username:amdin, password:123）
?登錄成功之后，成功返回令牌，如下圖所示。
?
拷貝返回的令牌，粘貼到令牌參數輸入框，再次訪問 /user/edit 接口。
這個時候，成功的返回了結果：?the edit service is called success.
同樣的，拷貝返回的令牌，粘貼到令牌參數輸入框，訪問 /user/delete 接口。
發現還是返回拒絕訪問的結果，那是因為訪問這個接口需要 'sys:user:delete' 權限，而我們之前返回的權限列表中并沒有包含，所以授權訪問失敗。
我們修改一下?SysUserServiceImpl，添加上‘sys:user:delete’ 權限，重新登錄，再次訪問一遍。
發現刪除接口也可以訪問了，記住務必要重新調用登錄接口，獲取令牌后拷貝到刪除接口，再次訪問刪除接口。
到此，Spring Security 的講解就結束了，本人知識有限，有不正確的地方，煩請指正，不盡感激。
?
源碼下載
碼云：https://gitee.com/liuge1988/spring-boot-demo.git
作者：朝雨憶輕塵
出處：https://www.cnblogs.com/xifengxiaoma/?
版權所有，歡迎轉載，轉載請注明原文作者及出處。
轉載于:https://www.cnblogs.com/xifengxiaoma/p/10020960.html
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