SpringBoot - 整合Druid数据源

【1】pom文件添加依赖

<!-- https://mvnrepository.com/artifact/com.alibaba/druid -->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.10</version>
        </dependency>

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【2】yml文件对数据源进行配置

yml文件示例如下：

spring:
  datasource:
    url: jdbc:mysql://localhost:3306/test
    username: root
    password: 123456
    driver-class-name: com.mysql.jdbc.Driver
    type: com.alibaba.druid.pool.DruidDataSource

    initialSize: 5
    minIdle: 5
    maxActive: 20
    maxWait: 60000
    timeBetweenEvictionRunsMillis: 60000
    minEvictableIdleTimeMillis: 300000
    validationQuery: SELECT 1 FROM DUAL
    testWhileIdle: true
    testOnBorrow: true
    testOnReturn: false
    poolPreparedStatements: true
#   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
    filters: stat,wall,log4j
    maxPoolPreparedStatementPerConnectionSize: 20
    useGlobalDataSourceStat: true
    connectionProperties: druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500

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如下图所示：

从initialSize属性开始，属性颜色呈现为黄色，这是不正常的。SpringBoot中，数据源配置默认对应DataSourceProperties类，很显然我们为Druid数据源配置的属性与默认数据源配置文件类不符。

解决方法：容器中注册自定义数据源！

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【3】注册Druid数据源

MyConfig 类如下：

@Configuration
public class MyConfig {

    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druid(){
        return new DruidDataSource();
    }
}

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测试如下图，拿到了配置文件中的数据源配置：

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【4】配置Druid的监控

之所以使用Druid数据源，除了其性能可靠外，还在于其完善的数据监控机制。

其主要是由StatViewServlet和WebStatFilter(用于配置Web和Druid数据源之间的管理关联监控统计)实现。

配置类如下：

@Configuration
public class MyConfig {

    @ConfigurationProperties(prefix = "spring.datasource")
    @Bean
    public DataSource druid(){
        return new DruidDataSource();
    }

    @Bean
    public ServletRegistrationBean statViewServlet(){
        ServletRegistrationBean registrationBean = new ServletRegistrationBean();
        registrationBean.setServlet(new StatViewServlet());
        registrationBean.setUrlMappings(Arrays.asList("/druid/*"));
        //设置初始化参数
        Map<String,String> initMap = new HashMap<>();
        initMap.put("loginUsername","admin");
        initMap.put("loginPassword","123456");
        initMap.put("allow","");
        initMap.put("deny","192.168.2.110");
        registrationBean.setInitParameters(initMap);
        return registrationBean;
    }
    @Bean
    public FilterRegistrationBean webStatFilter(){
        FilterRegistrationBean registrationBean = new FilterRegistrationBean();
        registrationBean.setFilter(new WebStatFilter());
        registrationBean.setUrlPatterns(Arrays.asList("/*"));
        //设置初始化参数
        Map<String,String> initMap = new HashMap<>();
        initMap.put("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico");
        registrationBean.setInitParameters(initMap);
        return registrationBean;
    }
}

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测试如下：

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其对应xml配置如下：

<!-- druid监控配置 -->
  <servlet>
    <servlet-name>DruidStatView</servlet-name>
    <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>
    <init-param>
      <!-- 用户名 -->
      <param-name>loginUsername</param-name>
      <param-value>admin</param-value>
    </init-param>
    <init-param>
      <!-- 密码 -->
      <param-name>loginPassword</param-name>
      <param-value>123456</param-value>
    </init-param>
    <!-- 拒绝 -->
      <param-name>deny</param-name>
      <param-value>192.168.2.110</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>DruidStatView</servlet-name>
    <url-pattern>/druid/*</url-pattern>
  </servlet-mapping>
  <filter>
    <filter-name>DruidWebStatFilter</filter-name>
    <filter-class>com.alibaba.druid.support.http.WebStatFilter</filter-class>
    <init-param>
      <param-name>exclusions</param-name>
      <param-value>*.js,*.gif,*.jpg,*.png,*.css,*.ico</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>DruidWebStatFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>