JMX(八)监控Tomcat

环境:Tomcat5.5、jdk6

1、先配Tomcat的启动语句,window下tomcat的bin/catalina.bat(linux为catalina.sh),在头上注释部分(.bat为rem、.sh为#)后面加上set JAVA_OPTS=-Dcom.sun.management.jmxremote.port=8999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=true

(linux为JAVA_OPTS=-Dcom.sun.management.jmxremote.port=8999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=true)
2、修改jmx远程访问授权。默认为JAVA_HOME/jre/lib/management下jmxremote.access、jmxremote.password(缺省系统提供了个模版jmxremote.password.template改下名就成)

注意:linux下需要该权限,chmod 600 jmxremote.access, chmod 600 jmxremote.password

window下特麻烦,现需要jdk装在NTFS文件系统下,选中文件,点右键“属性”-〉安全,点“高级”,去掉“从父项继承....”,弹出窗口中选“删除”,这样删除了所有访问权限。再选“添加”-〉高级,“立即查找”,选中你的用户,例administrator,点“确定",“确定"。来到权限窗口,勾选"完全控制",点"确定",OK了。

 

3、用jconsole连接远程linux服务时, IP地址和port都输入正确的情况下,仍然是连接失败 
vi /etc/hosts,将hostname对应的IP改为真实IP

 

4、测试JMX。启动tomcat,在window“命令行窗口”中输入netstat -an看下8999端口打开没有。若没有,则前面没配对。若已打开,则可在另一台机器的“命令行窗口”中输入jconsole,打开jdk自带的jmx客户端。选远程连接,录入tomcat所在机器的IP,端口例192.168.10.10:8999,帐号、密码在jmxremote.password中,如帐号controlRole,密码R&D(缺省monitorRole只能读,controlRole能读写,jmxremote.access中可配置)。点“连接”。看到图就行了。

 

5、关于数据。Mbean属性页中给出了相应的数据,Catalina中是tomcat的,java.lang是jvm的。对于加粗的黑体属性值,需双击一下才可看内容

 

public class JMXTest {  
  
    /** 
     * @param args 
     */  
    public static void main(String[] args) {  
        try {  
  
           String jmxURL = "service:jmx:rmi:///jndi/rmi://192.168.10.93:8999/jmxrmi";//tomcat jmx url  
           JMXServiceURL serviceURL = new JMXServiceURL(jmxURL);  
             
           Map map = new HashMap();  
           String[] credentials = new String[] { "monitorRole" , "QED" };  
           map.put("jmx.remote.credentials", credentials);  
           JMXConnector connector = JMXConnectorFactory.connect(serviceURL, map);  
           MBeanServerConnection  mbsc = connector.getMBeanServerConnection();  
             
           //端口最好是动态取得  
           ObjectName threadObjName = new ObjectName("Catalina:type=ThreadPool,name=http-8080");  
           MBeanInfo mbInfo = mbsc.getMBeanInfo(threadObjName);  
             
           String attrName = "currentThreadCount";//tomcat的线程数对应的属性值  
           MBeanAttributeInfo[] mbAttributes = mbInfo.getAttributes();  
           System.out.println("currentThreadCount:"+mbsc.getAttribute(threadObjName, attrName));  
             
           //heap  
           for(int j=0;j  s=mbsc.queryNames(managerObjName, null);  
           for (ObjectName obj:s){  
               System.out.println("应用名:"+obj.getKeyProperty("path"));  
               ObjectName objname=new ObjectName(obj.getCanonicalName());  
               System.out.println("最大会话数:"+ mbsc.getAttribute( objname, "maxActiveSessions"));  
               System.out.println("会话数:"+ mbsc.getAttribute( objname, "activeSessions"));  
               System.out.println("活动会话数:"+ mbsc.getAttribute( objname, "sessionCounter"));  
           }  
             
           //----------------- Thread Pool ----------------  
           ObjectName threadpoolObjName = new ObjectName("Catalina:type=ThreadPool,*");  
           Set s2=mbsc.queryNames(threadpoolObjName, null);  
           for (ObjectName obj:s2){  
               System.out.println("端口名:"+obj.getKeyProperty("name"));  
               ObjectName objname=new ObjectName(obj.getCanonicalName());  
               System.out.println("最大线程数:"+ mbsc.getAttribute( objname, "maxThreads"));  
               System.out.println("当前线程数:"+ mbsc.getAttribute( objname, "currentThreadCount"));  
               System.out.println("繁忙线程数:"+ mbsc.getAttribute( objname, "currentThreadsBusy"));  
           }  
                 
        } catch (Exception e) {  
            e.printStackTrace();  
        }  
    }  
  
    public static String formatTimeSpan(long span){  
        long minseconds = span % 1000;  
          
        span = span /1000;  
        long seconds = span % 60;  
          
        span = span / 60;  
        long mins = span % 60;  
          
        span = span / 60;  
        long hours = span % 24;  
  
        span = span / 24;  
        long days = span;  
        return (new Formatter()).format("%1$d天 %2$02d:%3$02d:%4$02d.%5$03d", days,hours,mins,seconds,minseconds).toString();  
    }  
}  
 

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