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Spring Boot 中使用 MyBatis 整合 Druid 多数据源

發布時間：2024/1/17 javascript 27 豆豆

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本文將講述 spring boot + mybatis + druid 多數據源配置方案。

環境

CentOs7.3 安裝 MySQL 5.7.19 二進制版本

Github 代碼

代碼我已放到 Github ，導入spring-boot-mybatis 項目

github https://github.com/souyunku/spring-boot-examples/tree/master/spring-boot-mybatis

添加依賴

在項目中添加 mybatis，druid 依賴

點擊預覽 pom.xml

<dependency><groupId>org.mybatis.spring.boot</groupId><artifactId>mybatis-spring-boot-starter</artifactId> </dependency> <dependency><groupId>com.alibaba</groupId><artifactId>druid</artifactId> </dependency> 省略更多

基礎數據源

@Configuration @EnableConfigurationProperties(DruidDbProperties.class) @Import({DruidMonitConfig.class}) public abstract class AbstractDruidDBConfig {private Logger logger = LoggerFactory.getLogger(AbstractDruidDBConfig.class);@Resourceprivate DruidDbProperties druidDbProperties;public DruidDataSource createDataSource(String url, String username, String password) {if (StringUtils.isEmpty(url)) {System.out.println("Your database connection pool configuration is incorrect!" + " Please check your Spring profile");throw new ApplicationContextException("Database connection pool is not configured correctly");}DruidDataSource datasource = new DruidDataSource();datasource.setUrl(url);datasource.setUsername(username);datasource.setPassword(password);// datasource.setDriverClassName(// StringUtils.isEmpty(driverClassName) ?// druidDbProperties.getDriverClassName() : driverClassName);datasource.setInitialSize(druidDbProperties.getInitialSize());datasource.setMinIdle(druidDbProperties.getMinIdle());datasource.setMaxActive(druidDbProperties.getMaxActive());datasource.setMaxWait(druidDbProperties.getMaxWait());datasource.setTimeBetweenEvictionRunsMillis(druidDbProperties.getTimeBetweenEvictionRunsMillis());datasource.setMinEvictableIdleTimeMillis(druidDbProperties.getMinEvictableIdleTimeMillis());datasource.setValidationQuery(druidDbProperties.getValidationQuery());datasource.setTestWhileIdle(druidDbProperties.isTestWhileIdle());datasource.setTestOnBorrow(druidDbProperties.isTestOnBorrow());datasource.setTestOnReturn(druidDbProperties.isTestOnReturn());try {datasource.setFilters(druidDbProperties.getFilters());} catch (SQLException e) {logger.error("druid configuration initialization filter", e);}datasource.setConnectionProperties(druidDbProperties.getConnectionProperties());return datasource;}/*** 加載默認mybatis xml配置文件，并初始化分頁插件** @param dataSource* @return* @throws Exception*/public SqlSessionFactory sqlSessionFactory(DataSource dataSource) throws Exception {return createSqlSessionFactory(dataSource, "classpath:mybatis/**/*.xml");}/*** 加載mybatis xml配置文件，并初始化分頁插件** @param dataSource 數據源* @param mapperLocations 自定義xml配置路徑* @return* @throws Exception*/public SqlSessionFactory sqlSessionFactory(DataSource dataSource, String mapperLocations) throws Exception {return createSqlSessionFactory(dataSource, mapperLocations);}private SqlSessionFactory createSqlSessionFactory(DataSource dataSource, String mapperLocations) throws Exception {SqlSessionFactoryBean sqlSessionFactoryBean = new SqlSessionFactoryBean();sqlSessionFactoryBean.setDataSource(dataSource);// mybatis分頁PageHelper pageHelper = new PageHelper();Properties props = new Properties();props.setProperty("dialect", "mysql");props.setProperty("reasonable", "true");props.setProperty("supportMethodsArguments", "true");props.setProperty("returnPageInfo", "check");props.setProperty("params", "count=countSql");pageHelper.setProperties(props); // 添加插件sqlSessionFactoryBean.setPlugins(new Interceptor[]{pageHelper});PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();sqlSessionFactoryBean.setMapperLocations(resolver.getResources(mapperLocations));return sqlSessionFactoryBean.getObject();} }

Druid 監控配置

@EnableConfigurationProperties(DruidDbProperties.class) @EnableAspectJAutoProxy(proxyTargetClass = true) public class DruidMonitConfig {@Resourceprivate DruidDbProperties druidDbProperties;@Beanpublic ServletRegistrationBean druidServlet() {ServletRegistrationBean reg = new ServletRegistrationBean();reg.setServlet(new StatViewServlet());reg.addUrlMappings("/druid/*");if (!StringUtils.isEmpty(druidDbProperties.getAllow())) {reg.addInitParameter("allow", druidDbProperties.getAllow()); // 白名單}if (!StringUtils.isEmpty(druidDbProperties.getDeny())) {reg.addInitParameter("deny", druidDbProperties.getDeny()); // 黑名單}reg.addInitParameter("loginUsername", druidDbProperties.getUsername());reg.addInitParameter("loginPassword", druidDbProperties.getPassword());return reg;}@Beanpublic FilterRegistrationBean filterRegistrationBean() {FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();filterRegistrationBean.setFilter(new WebStatFilter());filterRegistrationBean.addUrlPatterns("/*");filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");return filterRegistrationBean;}/*** 監聽Spring 1.定義攔截器 2.定義切入點 3.定義通知類** @return*/@Beanpublic DruidStatInterceptor druidStatInterceptor() {return new DruidStatInterceptor();}@Beanpublic JdkRegexpMethodPointcut druidStatPointcut() {JdkRegexpMethodPointcut druidStatPointcut = new JdkRegexpMethodPointcut();String patterns = "io.ymq.mybatis*";druidStatPointcut.setPatterns(patterns);return druidStatPointcut;}@Beanpublic Advisor druidStatAdvisor() {return new DefaultPointcutAdvisor(druidStatPointcut(), druidStatInterceptor());} }

Druid 監控參數

@ConfigurationProperties(prefix = "druid") public class DruidDbProperties {private String driverClassName = "com.mysql.jdbc.Driver";/*** 初始化時建立物理連接的個數。初始化發生在顯示調用init方法，或者第一次getConnection時*/private int initialSize = 10;/*** 最小連接池數量*/private int minIdle = 50;/*** 最大連接池數量*/private int maxActive = 300;/*** 獲取連接時最大等待時間，單位毫秒。配置了maxWait之后，缺省啟用公平鎖，并發效率會有所下降，如果需要可以通過配置useUnfairLock屬性為true使用非公平鎖。*/private int maxWait = 60000;/*** 有兩個含義： 1)* Destroy線程會檢測連接的間隔時間，如果連接空閑時間大于等于minEvictableIdleTimeMillis則關閉物理連接。 2)* testWhileIdle的判斷依據，詳細看testWhileIdle屬性的說明*/private int timeBetweenEvictionRunsMillis = 60000;/*** 連接保持空閑而不被驅逐的最長時間*/private int minEvictableIdleTimeMillis = 3600000;/*** 用來檢測連接是否有效的sql，要求是一個查詢語句，常用select* 'x'。如果validationQuery為null，testOnBorrow、testOnReturn、testWhileIdle都不會其作用。*/private String validationQuery = "SELECT USER()";/*** 建議配置為true，不影響性能，并且保證安全性。申請連接的時候檢測，如果空閑時間大于timeBetweenEvictionRunsMillis，執行validationQuery檢測連接是否有效。*/private boolean testWhileIdle = true;/*** 申請連接時執行validationQuery檢測連接是否有效，做了這個配置會降低性能。*/private boolean testOnBorrow = false;/*** 歸還連接時執行validationQuery檢測連接是否有效，做了這個配置會降低性能。*/private boolean testOnReturn = false;/*** 屬性類型是字符串，通過別名的方式配置擴展插件，常用的插件有：監控統計用的filter:stat 日志用的filter:log4j* 防御sql注入的filter:wall*/private String filters = "mergeStat,config,wall";private String connectionProperties;/*** 白名單*/private String allow;/*** 黑名單*/private String deny;private String username = "admin";private String password = "admin";省略 get set }

配置數據源 one

@Configuration @EnableTransactionManagement public class DBOneConfiguration extends AbstractDruidDBConfig {@Value("${ymq.one.datasource.url}")private String url;@Value("${ymq.one.datasource.username}")private String username;@Value("${ymq.one.datasource.password}")private String password;// 注冊 datasourceOne@Bean(name = "datasourceOne", initMethod = "init", destroyMethod = "close")public DruidDataSource dataSource() {return super.createDataSource(url, username, password);}@Bean(name = "sqlSessionFactorYmqOne")public SqlSessionFactory sqlSessionFactory() throws Exception {return super.sqlSessionFactory(dataSource());}@Beanpublic PlatformTransactionManager transactionManager() throws SQLException {return new DataSourceTransactionManager(dataSource());} }

配置數據源 two

BaseDao one

@Repository public class YmqOneBaseDao extends BaseDao {@Resourcepublic void setSqlSessionFactorYmqOne(SqlSessionFactory sqlSessionFactory) {super.setSqlSessionFactory(sqlSessionFactory);} }

BaseDao two

@Repository public class YmqTwoBaseDao extends BaseDao {@Resourcepublic void setSqlSessionFactorYmqTwo(SqlSessionFactory sqlSessionFactory) {super.setSqlSessionFactory(sqlSessionFactory);} }

測試 Controller

@RestController public class IndexController {private static final Logger LOG = LoggerFactory.getLogger(IndexController.class);@Autowiredprivate YmqOneBaseDao ymqOneBaseDao;@Autowiredprivate YmqTwoBaseDao ymqTwoBaseDao;@RequestMapping("/")public String index() throws Exception {List<TestOnePo> testOnePoList = null;testOnePoList = ymqOneBaseDao.selectList(new TestOnePo());for (TestOnePo item : testOnePoList) {LOG.info("數據源 ymqOneBaseDao ：查詢結果:{}", JSONObject.toJSONString(item));}List<TestTwoPo> testTwoPoList = null;testTwoPoList = ymqTwoBaseDao.selectList(new TestTwoPo());for (TestTwoPo item : testTwoPoList) {LOG.info("數據源 ymqTwoBaseDao：查詢結果:{}", JSONObject.toJSONString(item));}String onePoList = JSONObject.toJSONString(testOnePoList);String twoPoList = JSONObject.toJSONString(testTwoPoList);return "數據源 ymqOneBaseDao ：查詢結果:" + onePoList + "<br/> 數據源 ymqTwoBaseDao ：查詢結果:" + twoPoList;} }

參數配置

application.properties

#############SERVER CONFIG############ spring.application.name=ymq-mybatis-spring-boot#數據源 one ymq.one.datasource.url=jdbc:mysql://10.4.82.6:3306/ymq_one?useUnicode=true&characterEncoding=UTF-8 ymq.one.datasource.username=root ymq.one.datasource.password=123456#數據源 two ymq.two.datasource.url=jdbc:mysql://10.4.82.6:3306/ymq_two?useUnicode=true&characterEncoding=UTF-8 ymq.two.datasource.username=root ymq.two.datasource.password=123456server.port=80 server.tomcat.max-threads=1000 server.tomcat.max-connections=2000

啟動服務

@SpringBootApplication @ComponentScan(value = {"io.ymq.mybatis"}) public class Startup {public static void main(String[] args) {SpringApplication.run(Startup.class, args);} }

在頁面上輸入 http://localhost/ 可以看到 Controller 執行情況：

數據源 ymqOneBaseDao ：查詢結果:[{"id":1,"name":"測試","remark":"這是測試 ymq_one 數據庫"}] 數據源 ymqTwoBaseDao ：查詢結果:[{"id":1,"name":"測試","remark":"這是測試 ymq_two 數據庫"}]

在頁面上輸入 http://localhost/druid/ 可以看到監控到的sql語句執行情況：

代碼我已放到 Github ，導入spring-boot-mybatis 項目

github https://github.com/souyunku/spring-boot-examples/tree/master/spring-boot-mybatis

Contact

作者：鵬磊
出處：http://www.ymq.io
Email：admin@souyunku.com
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Wechat：關注公眾號，搜云庫，專注于開發技術的研究與知識分享

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