SpringBoot 做代web理服務(wù)器

因公司業(yè)務(wù)需要，把多個(gè)子系統(tǒng)集成到一個(gè)平臺，但是又不希望把代碼重做一遍，子系統(tǒng)用nodejs，主平臺用java，所以不能直接融合到一起。
一個(gè)想法就是，現(xiàn)在web開發(fā)都采用的前后臺分離模式，把子平臺的前臺代碼放在主平臺的一個(gè)目錄中，然后在主平臺做一個(gè)代理，對接子平臺的后臺代碼，主平臺做個(gè)代理，這樣不同平臺代碼就打通了。
今天嘗試了下，springmvc框架，springboot提供很好用的代碼可以簡單來實(shí)現(xiàn)，以下是自己測試的小例子，供自己備忘，也希望能分享有需要的朋友！

• 測試采用的springboot的demo模塊，從start.spring.io上下載

<?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>com.example</groupId><artifactId>demo</artifactId><version>0.0.1-SNAPSHOT</version><packaging>jar</packaging><name>demo</name><description>Demo project for Spring Boot</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.5.4.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>1.7</java.version></properties><dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-test</artifactId><scope>test</scope></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency></dependencies><build><plugins><plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId></plugin></plugins></build></project>

• SpringBoot 下載來的例子中自帶的Demo，補(bǔ)充個(gè)RestTemplate工具

package com.example.demo; import org.springframework.web.client.RestTemplate;@SpringBootApplication @ServletComponentScan @EnableAutoConfiguration public class DemoApplication {// 啟動(dòng)的時(shí)候要注意，由于我們在controller中注入了RestTemplate，所以啟動(dòng)的時(shí)候需要實(shí)例化該類的一個(gè)實(shí)例 @Autowired private RestTemplateBuilder builder; // 使用RestTemplateBuilder來實(shí)例化RestTemplate對象，spring默認(rèn)已經(jīng)注入了RestTemplateBuilder實(shí)例 @Bean public RestTemplate restTemplate() { return builder.build(); } public static void main(String[] args) {SpringApplication.run(DemoApplication.class, args);//main1(null);} }

• 因?yàn)樾枰獢r截界面對子系統(tǒng)的請求，所以添加了一個(gè)過濾器，攔截到子系統(tǒng)代碼時(shí)做一次轉(zhuǎn)發(fā)，代碼如下

package com.example.demo;import java.io.IOException;import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.RequestDispatcher; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.annotation.WebFilter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse;import org.slf4j.Logger; import org.slf4j.LoggerFactory;@WebFilter(filterName = "myFilter", urlPatterns = "/*") public class MyWebFilter implements Filter {protected final Logger logger = LoggerFactory.getLogger(this.getClass());@Overridepublic void destroy() {logger.debug("...MyWebFilter destroy...");}@Overridepublic void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)throws IOException, ServletException {HttpServletRequest req = (HttpServletRequest) request;HttpServletResponse resp = (HttpServletResponse) response;String requestURI = req.getRequestURI();logger.debug("...MyWebFilter doFilter...");logger.debug("req:" + requestURI);if (requestURI.startsWith("/sub")) {RequestDispatcher rd = req.getRequestDispatcher("/reset");req.setAttribute("requestURI", requestURI);rd.forward(req, resp);return;}chain.doFilter(req, resp);}@Overridepublic void init(FilterConfig arg0) throws ServletException {logger.info("...MyWebFilter init...");}}

• *接下來重要一步就是寫自己如果做的代理，其實(shí)本來想用httpclient來寫，感覺有點(diǎn)復(fù)雜，后發(fā)網(wǎng)上發(fā)現(xiàn)RestTemplate是個(gè)好東西，減少了許多代碼

package com.example.demo.action;import java.util.Enumeration; import java.util.HashMap; import java.util.Map;import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.client.RestTemplate;@RestController public class MyAction {protected final Logger logger = LoggerFactory.getLogger(this.getClass());@Autowiredprivate RestTemplate restTemplate; @RequestMapping("/")public String home() {return "Hello World!";}@RequestMapping("/next")public String next(HttpServletRequest request, HttpServletResponse response) {String reqURL = request.getRequestURI();logger.debug("reqURL:"+reqURL);return "next!";}@RequestMapping("/reset")@ResponseBodypublic Object reset(HttpServletRequest request, HttpServletResponse response) {String reqURL = request.getRequestURI();String queryString = request.getQueryString();String orgURI = (String)request.getAttribute("requestURI");logger.debug("reqURL:"+reqURL);logger.debug("queryString:"+queryString);//logger.debug("orgURI:"+orgURI);String targetIP = "http://172.17.7.113:1780";String targetURL = targetIP.concat(orgURI).concat("?").concat(queryString);logger.debug("targetURL:"+targetURL);Enumeration<String> params = request.getParameterNames();Map<String,String> paramMap = new HashMap<String,String>();while(params.hasMoreElements()){String paraName = params.nextElement();paramMap.put(paraName, request.getParameter(paraName));} String json = restTemplate.postForEntity(targetURL, paramMap, String.class).getBody(); System.out.println(json);return json;}}

當(dāng)我請求http://localhost:8080/sub/aa?id=1,代碼restTemplate會(huì)幫我轉(zhuǎn)發(fā)到targetURL ，并轉(zhuǎn)發(fā)返回結(jié)果。

結(jié)論

• 當(dāng)前簡單的例子，還需要有所完善，比如說編碼問題，返回未json格式
• 該功能只能實(shí)現(xiàn)對前后臺有明確的ajax接口轉(zhuǎn)發(fā)，具體的界面文件還不行，后面想繼續(xù)完善。

總結(jié)

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