JMX实战demo

怼烎@ 2023-02-20 13:32 96阅读 0赞

jmx(java management extension) 是jdk提供的为Java应用提供监控功能的一个标准，类似于jms等，在许多的由java编写的框架如es,tomcat,activiti中都引入了jmx进行应用监控。下面我就来写一个jmx的例子以供参考。

使用Jmx需要引入一个Jar包(jmxtools-1.2.1.jar),这个jar包不在jdk原生的jar包里面，需要另行下载，然后倒入到项目中去。这里提供一个下载地址

http://www.datanucleus.org/downloads/maven2/com/sun/jdmk/jmxtools/1.2.1/

下面就开始来实现一个jmx的demo

先创建一个接口TomcatUtilMBean

public interface TomcatUtilMBean {
    
        void setServerName(String serverName);
        String getServerName();
        void setPort(int port);
        int getPort();
        String getTomcatInfo();
    }

然后写一个实现类TomcatUtil

public class TomcatUtil implements TomcatUtilMBean {
    
        public String serverName = "Catalina";
        public int port = 8080;
    
        @Override
        public void setServerName(String serverName) {
            this.serverName = serverName;
        }
    
        @Override
        public String getServerName() {
            return serverName;
        }
    
        @Override
        public void setPort(int port) {
            this.port = port;
        }
    
        @Override
        public int getPort() {
            return port;
        }
    
        @Override
        public String getTomcatInfo() {
            return "The Tomcat's name is "+ serverName +", port is " + port;
        }
    }

然后创建一个jmx的server

public class TomcatMonitor {
    
        public static void main(String[] args) throws Exception {
            MBeanServer mBeanServer = ManagementFactory.getPlatformMBeanServer();
            TomcatUtilMBean tomcatUtilMBean = new TomcatUtil();
            mBeanServer.registerMBean(tomcatUtilMBean, new ObjectName("myMBean:name=tomcatUtil"));
            HtmlAdaptorServer htmlAdaptorServer = new HtmlAdaptorServer();
            htmlAdaptorServer.setPort(8888);
            mBeanServer.registerMBean(htmlAdaptorServer, new ObjectName("myMBean:name = htmlAdaptor,port=8888"));
            htmlAdaptorServer.start();
        }
    }

启动后在浏览器访问http://localhost:8888 即可看到jmx的管理界面。如下

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MTc1MTYyNQ_size_16_color_FFFFFF_t_70][]

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