Druid's sql monitoring in SpringBoot has no data solution

This article mainly introduces how to solve the problem that there is no data in sql monitoring after SpringBoot integrates Druid.
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First we need to integrate Druid

• Introduce dependencies in pom.xml

    	 <!--设置数据源 默认是使用springboot中的jdbc连接池-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid</artifactId>
            <version>1.1.16</version>
        </dependency>
  

• Configuration parameters

     #指定连接池类型
     spring.datasource.type=com.alibaba.druid.pool.DruidDataSource
     #连接池的配置信息
     #初始化大小,最小,最大
     spring.datasource.initalSize=5
     spring.datasource.maxActive=20
     spring.datasource.minIdle=5
     #配置获取连接等待超时的时间
     spring.datasource.maxWait=60000
     # 配置一个连接在池中最小生存的时间，单位是毫秒
     spring.datasource.minEvictableIdleTimeMillis=300000
     spring.datasource.validationQuery=SELECT 1 FROM DUAL
     spring.datasource.testWhileIdle=true
     spring.datasource.testOnBorrow=false
     spring.datasource.testOnReturn=false
  

• Create a Druid configuration class

  //这个注解用来声明跟这个类是配置类
  @Configuration
  public class DruidConfig {
        
        
  
      @ConfigurationProperties(prefix = "spring.datasource")	// 用来扫描配置文件中前缀为spring.datasource的配置信息
      @Bean			//用来注册到配置容器中
      public DataSource druid() {
        
        
          return new DruidDataSource();
      }
  
      //配置Druid的监控
      //配置一个管理后台的Servlet
      @Bean
      public ServletRegistrationBean statViewServlet() {
        
        
          ServletRegistrationBean servletRegistrationBean = new ServletRegistrationBean(new StatViewServlet(), "/druid/*");
  
          Map<String,String> initParam = new HashMap<>();
          initParam.put("loginUsername","admin");
          initParam.put("loginPassword","123456");
          initParam.put("allow","");  //默认就是允许所有访问
          initParam.put("deny","");		//默认访问
  
          servletRegistrationBean.setInitParameters(initParam);
          return  servletRegistrationBean;
      }
  
      //注册一个filters
      @Bean
      public FilterRegistrationBean druidStatFilter(){
        
        
          FilterRegistrationBean filterRegistrationBean = new FilterRegistrationBean(new WebStatFilter());
          //添加过滤规则.
          filterRegistrationBean.addUrlPatterns("/*");
          //添加不需要忽略的格式信息.
          filterRegistrationBean.addInitParameter("exclusions","*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*");
          return filterRegistrationBean;
      }
  }
  

In this way we have configured Druid

• Start the project, visit localhost:port number/druid, jump to the login page, and log in using the configured admin and 123456

• The problem comes at this time. We don’t see the data in the SQL monitoring in the druid management page.

  

• solution

  • Add to configuration parameters

        #配置监控统计拦截的filters,去掉后监控界面sql将无法统计
        spring.datasource.filters : stat
    

  • Then start the project and visit the druid management page again. At this time, you can see that there is data in the sql monitoring.
    
  • In this way, the problem of no sql monitoring can be successfully solved. If there are still problems, check the dependencies in the pom file.