Tomcat: JMX is used to supervise Tomcat in several ways.

Tomcat: JMX is used to supervise Tomcat in several ways.

Tomcat uses the JMX management method. The built-in Application manager of Tomcat uses the JMX method to manage Tomcat, so as to achieve dynamic deployment, start, and stop of Web applications.

However, a manager application uses the JMX interface locally. What do other remote clients do?

 

Method 1: JConsole client:

1) set the environment variable CATALINA:

	set CATALINA_OPTS=-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=9999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false

This is the setting method for Windows.

Linux/Unix: export CATALINA_OPTS =-Dcom. sun. management. jmxremote '''catalina _ OPTS =-Dcom. sun. management. jmxremote '''catalina _ OPTS =-Dcom. sun. management. jmxremote ''-Dcom. sun. management. jmxremote. authenticate = false

Many people on the Internet say that JAVA_OPTS is set up. We recommend that you do not do this.

2) start Tomcat

3) Open JConsole and set the remote connection address: tomcat_ip: 9999.

Tomcat_ip is the IP address of the machine where Tomcat is located and 9999 is the port set above.

 

Method 2: Use Ant build. xml

For more information, see: http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html#JMXAccessorGetTask:__get_attribute_value_Ant_task

Same principle.

 

Method 3: Use Ant Task in Java code

GetTask task=new GetTask();task.setURL("http://tomcat_ip:9999/manager");task.setUser("xxx");task.setPassword("xxx");Project pro=new Project();task.setOutproperty("output");task.setProject(pro);task.execute();String responseText=project.getProperty("output");

Principle: Use a url to access the manager application and use JMX for manager Management.

 

Method 4: Access the manager application directly in Java code

public void tomcatHome(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        // TODO Auto-generated method stub        URL url=new URL("http://localhost:8080/manager/html");        HttpURLConnection  conn=(HttpURLConnection)url.openConnection();                conn.setAllowUserInteraction(false);        conn.setDoInput(true);        conn.setUseCaches(false);                conn.setDoOutput(false);        conn.setRequestMethod("GET");                conn.setRequestProperty("Accept-Charset", "utf-8");        conn.setRequestProperty("Content-Type", "application/x-www-form-urlencoded");                String username="admin";        String password="admin";        String authoInfo=new String(Base64.encode((username + ":" + password).getBytes()));        conn.setRequestProperty("Authorization", "Basic "+authoInfo);        conn.setRequestProperty("Connection", "keep-alive");        conn.connect();                InputStream input=conn.getInputStream();        response.setContentType("text/html;charset=UTF-8");        PrintWriter out= response.getWriter();        byte[] bs=new byte[1024];        int len=-1;                while((len=input.read(bs))!=-1){            out.write(new String(bs, 0, len));        }        out.flush();        out.close();            }

Same principle.

 

Method 5: access through JMX APIs in Java

See my previous blog. Of course, this method is also common on the network.