springboot+druid sql监控页面无法显示sql语句

àì夳堔傛蜴生んèń 2021-09-15 18:06 641阅读 0赞

1、无法显示sql监控数据：

按照[这篇][Link 1]文章配置好springboot+mybatis+druid，然后打开[http://127.0.0.1:8080/druid][http_127.0.0.1_8080_druid] 页面，可以看到数据源、web监控等信息，但是无法看到sql监控。一直怀疑是配置问题，后来发现是版本。

pom.xml中开始引入的是

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>druid</artifactId>
    <version>1.0.19</version>
    </dependency>

改成

<dependency>
    	    <groupId>com.alibaba</groupId>
    	    <artifactId>druid-spring-boot-starter</artifactId>
    	    <version>1.1.9</version>
    	</dependency>

重启后，还是没有sql监控数据。继续检查，使用druid进行统计的时候，需要配置一个filter和一个servlet，如下：

DruidWebStatFilter：

<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>/static/*,*.js,*.gif,*.jpg,*.png,*.css,*.ico,/druid/*</param-value>  
            </init-param>  
        </filter>  
        <filter-mapping>  
            <filter-name>DruidWebStatFilter</filter-name>  
            <url-pattern>/*</url-pattern>  
        </filter-mapping>

DruidStatServlet：

<servlet>  
            <servlet-name>DruidStatView</servlet-name>  
            <servlet-class>com.alibaba.druid.support.http.StatViewServlet</servlet-class>  
        </servlet>  
        <servlet-mapping>  
            <servlet-name>DruidStatView</servlet-name>  
            <url-pattern>/druid/*</url-pattern>  
        </servlet-mapping>

接着，需要在spring中初始化Druid数据源

**注意**： <property name="filters" value="stat" />属性，不然无法显示SQL检测信息。

看到这里，我们需要在springboot的数据源配置中加上如下代码：

@Bean(name = "ds3DataSource")
        public DataSource ds3DataSource() {
            DruidDataSource dataSource = new DruidDataSource();
            dataSource.setDriverClassName(driverClass);
            dataSource.setUrl(url);
            dataSource.setUsername(user);
            dataSource.setPassword(password);
            
            //连接池配置
            dataSource.setMaxActive(maxActive);
            dataSource.setMinIdle(minIdle);
            dataSource.setInitialSize(initialSize);
            dataSource.setMaxWait(maxWait);
            dataSource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
            dataSource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
            dataSource.setTestWhileIdle(testWhileIdle);
            dataSource.setTestOnBorrow(testOnBorrow);
            dataSource.setTestOnReturn(testOnReturn);
            dataSource.setValidationQuery("SELECT 'x'");
            
            dataSource.setPoolPreparedStatements(true);
            dataSource.setMaxPoolPreparedStatementPerConnectionSize(30);
            
            try {
    			dataSource.setFilters("stat");
    		} catch (SQLException e) {
    			e.printStackTrace();
    		}
            
            return dataSource;
        }

如最后一行。之后重启系统，即可在界面上看到sql监控数据了。

2、启动报错：

按照上面配置，在本地可以跑起来（本地是jdk1.8），打包放到服务器上启动就会报错（jdk1.7）。

[07-17 11:42:23] [ERROR] [org.springframework.beans.factory.support.DefaultListableBeanFactory:581] Destroy method on bean with name 'org.springframework.boot.autoconfigure.internalCachingMetadataReaderFactory' threw an exception
    java.lang.IllegalStateException: ApplicationEventMulticaster not initialized - call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@7bf16be0: startup date [Tue Jul 17 11:42:22 CST 2018]; root of context hierarchy
    	at org.springframework.context.support.AbstractApplicationContext.getApplicationEventMulticaster(AbstractApplicationContext.java:414)
    	at org.springframework.context.support.ApplicationListenerDetector.postProcessBeforeDestruction(ApplicationListenerDetector.java:97)
    	at org.springframework.beans.factory.support.DisposableBeanAdapter.destroy(DisposableBeanAdapter.java:253)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroyBean(DefaultSingletonBeanRegistry.java:578)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingleton(DefaultSingletonBeanRegistry.java:554)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingleton(DefaultListableBeanFactory.java:961)
    	at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.destroySingletons(DefaultSingletonBeanRegistry.java:523)
    	at org.springframework.beans.factory.support.FactoryBeanRegistrySupport.destroySingletons(FactoryBeanRegistrySupport.java:230)
    	at org.springframework.beans.factory.support.DefaultListableBeanFactory.destroySingletons(DefaultListableBeanFactory.java:968)
    	at org.springframework.context.support.AbstractApplicationContext.destroyBeans(AbstractApplicationContext.java:1030)
    	at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:556)
    	at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122)
    	at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693)
    	at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360)
    	at org.springframework.boot.SpringApplication.run(SpringApplication.java:303)
    	at org.springframework.boot.web.support.SpringBootServletInitializer.run(SpringBootServletInitializer.java:151)
    	at org.springframework.boot.web.support.SpringBootServletInitializer.createRootApplicationContext(SpringBootServletInitializer.java:131)
    	at org.springframework.boot.web.support.SpringBootServletInitializer.onStartup(SpringBootServletInitializer.java:86)
    	at org.springframework.web.SpringServletContainerInitializer.onStartup(SpringServletContainerInitializer.java:169)
    	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5178)
    	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1419)
    	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1409)
    	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
    	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    	at java.lang.Thread.run(Thread.java:745)

解决方法：升级jdk到1.8，或者引入druid的1.1.10版本。

[Link 1]: https://blog.csdn.net/liuxiao723846/article/details/80456025
[http_127.0.0.1_8080_druid]: http://127.0.0.1:8080/druid