Spring Boot (八)：配置Druid 连接池

springboot 配置 Druid连接池

一、添加依赖

<!-- 驱动 --><dependency>    <groupId>mysql</groupId>    <artifactId>mysql-connector-java</artifactId>    <scope>runtime</scope></dependency><!-- 连接池 --><dependency>    <groupId>com.alibaba</groupId>    <artifactId>druid</artifactId>    <version>1.1.0</version></dependency>

二、配置application.properties

spring.datasource.type = com.alibaba.druid.pool.DruidDataSourcespring.datasource.driverClassName = com.mysql.jdbc.Driverspring.datasource.url = jdbc:mysql://localhost:3306/admin?useUnicode=true&characterEncoding=utf-8&useSSL=falsespring.datasource.username = usernamespring.datasource.password = password# 下面为连接池的补充设置，应用到上面所有数据源中# 初始化大小，最小，最大spring.druid.datasource.initialSize=5spring.druid.datasource.minIdle=5spring.druid.datasource.maxActive=20# 配置获取连接等待超时的时间spring.druid.datasource.maxWait=60000# 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒spring.druid.datasource.timeBetweenEvictionRunsMillis=60000# 配置一个连接在池中最小生存的时间，单位是毫秒spring.druid.datasource.minEvictableIdleTimeMillis=300000# Oracle请使用select 1 from dualspring.druid.datasource.validationQuery=SELECT 'x'spring.druid.datasource.testWhileIdle=truespring.druid.datasource.testOnBorrow=falsespring.druid.datasource.testOnReturn=false# 打开PSCache，并且指定每个连接上PSCache的大小spring.druid.datasource.poolPreparedStatements=falsespring.druid.datasource.maxPoolPreparedStatementPerConnectionSize=20# 配置监控统计拦截的filters，去掉后监控界面sql无法统计，'wall'用于防火墙spring.druid.datasource.filters=stat,wall,slf4j# 通过connectProperties属性来打开mergeSql功能；慢SQL记录spring.druid.datasource.connectionProperties=druid.stat.mergeSql=true;druid.stat.slowSqlMillis=5000

三、新建Druid 配置类

在Spring Boot1.4.0中驱动配置信息没有问题，但是连接池的配置信息不再支持这里的配置项，即无法通过配置项直接支持相应的连接池；这里列出的这些配置项可以通过定制化DataSource来实现。目前Spring Boot中默认支持的连接池有dbcp,dbcp2, tomcat, hikari三种连接池。 由于Druid暂时不在Spring Bootz中的直接支持，故需要进行配置信息的定制：

package com.greatdrive.admin.config;import java.sql.SQLException;import javax.sql.DataSource;import org.apache.log4j.Logger;import org.springframework.beans.factory.annotation.Value;import org.springframework.boot.context.properties.ConfigurationProperties;import org.springframework.boot.web.servlet.FilterRegistrationBean;import org.springframework.boot.web.servlet.ServletRegistrationBean;import org.springframework.context.annotation.Bean;import org.springframework.context.annotation.Primary;import com.alibaba.druid.pool.DruidDataSource;import com.alibaba.druid.support.http.StatViewServlet;import com.alibaba.druid.support.http.WebStatFilter;@ConfigurationProperties(prefix = "spring.druid.datasource")@Configurationpublic class DruidDBConfig {      private Logger logger = Logger.getLogger(this.getClass());    @Value("${spring.datasource.url}")      private String dbUrl;      @Value("${spring.datasource.username}")      private String username;      @Value("${spring.datasource.password}")      private String password;      @Value("${spring.datasource.driverClassName}")      private String driverClassName;      @Value("${spring.datasource.initialSize}")      private int initialSize;      @Value("${spring.datasource.minIdle}")      private int minIdle;      @Value("${spring.datasource.maxActive}")      private int maxActive;      @Value("${spring.datasource.maxWait}")      private long maxWait;      @Value("${spring.datasource.timeBetweenEvictionRunsMillis}")      private int timeBetweenEvictionRunsMillis;      @Value("${spring.datasource.minEvictableIdleTimeMillis}")      private int minEvictableIdleTimeMillis;      @Value("${spring.datasource.validationQuery}")      private String validationQuery;      @Value("${spring.datasource.testWhileIdle}")      private boolean testWhileIdle;      @Value("${spring.datasource.testOnBorrow}")      private boolean testOnBorrow;      @Value("${spring.datasource.testOnReturn}")      private boolean testOnReturn;      @Value("${spring.datasource.poolPreparedStatements}")      private boolean poolPreparedStatements;      @Value("${spring.datasource.maxPoolPreparedStatementPerConnectionSize}")      private int maxPoolPreparedStatementPerConnectionSize;      @Value("${spring.datasource.filters}")      private String filters;      @Value("{spring.datasource.connectionProperties}")      private String connectionProperties;      @Bean     //声明其为Bean实例      @Primary  //在同样的DataSource中，首先使用被标注的DataSource      public DataSource dataSource(){          DruidDataSource datasource = new DruidDataSource();          datasource.setUrl(this.dbUrl);          datasource.setUsername(username);          datasource.setPassword(password);          datasource.setDriverClassName(driverClassName);          //configuration          datasource.setInitialSize(initialSize);          datasource.setMinIdle(minIdle);          datasource.setMaxActive(maxActive);          datasource.setMaxWait(maxWait);          datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);          datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);          datasource.setValidationQuery(validationQuery);          datasource.setTestWhileIdle(testWhileIdle);          datasource.setTestOnBorrow(testOnBorrow);          datasource.setTestOnReturn(testOnReturn);          datasource.setPoolPreparedStatements(poolPreparedStatements);          datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);          try {              datasource.setFilters(filters);          } catch (SQLException e) {              logger.error("druid configuration initialization filter", e);          }          datasource.setConnectionProperties(connectionProperties);          return datasource;      }      @Bean    public ServletRegistrationBean druidServlet() {        ServletRegistrationBean reg = new ServletRegistrationBean();        reg.setServlet(new StatViewServlet());        reg.addUrlMappings("/druid/*");        reg.addInitParameter("allow", "127.0.0.1,192.168.1.83"); //白名单        reg.addInitParameter("deny",""); //黑名单        reg.addInitParameter("loginUsername", "admin");//查看监控的用户名        reg.addInitParameter("loginPassword", "nimda");//密码        return reg;    }    @Bean public FilterRegistrationBean filterRegistrationBean() {        FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean();        filterRegistrationBean.setFilter(new WebStatFilter());        filterRegistrationBean.addUrlPatterns("/*");        filterRegistrationBean.addInitParameter("exclusions", "*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");        return filterRegistrationBean;    }}

四、启动测试

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