使用JMX监控Tomcat JVM

转载请注明出处：http://blog.csdn.net/l1028386804/article/details/51547408

2016年5月的最后一天，今天我将和大家分享Java中如何使用JMX来监控Tomcat的各种状态。好了，不多说了，我们直接进入主题

一、激活Tomcat的JMX远程配置

要通过JMX远程监控Tomcat，首先需要激活Tomcat的JMX远程配置。

① 修改脚本

先修改Tomcat的启动脚本，windows下为bin/catalina.bat（Linux下为catalina.sh），添加以下内容，8999是jmxremote使用的端口号，第二个false表示不需要鉴权：

 set JMX_REMOTE_CONFIG=-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=8999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=false
 set CATALINA_OPTS=%CATALINA_OPTS% %JMX_REMOTE_CONFIG%

要注意以上语句的位置不能太后面，可以加在【if "%OS%" == "Windows_NT" setlocal】一句后的大段的注释后面。

参考官方说明：

http://tomcat.apache.org/tomcat-6.0-doc/monitoring.html#Enabling_JMX_Remote

http://tomcat.apache.org/tomcat-7.0-doc/monitoring.html#Enabling_JMX_Remote

http://tomcat.apache.org/tomcat-8.0-doc/monitoring.html#Enabling_JMX_Remote

http://tomcat.apache.org/tomcat-9.0-doc/monitoring.html#Enabling_JMX_Remote

② 鉴权

上面的配置是不需要鉴权的，如果需要鉴权则添加的内容为：

 set JMX_REMOTE_CONFIG=-Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=8999 -Dcom.sun.management.jmxremote.ssl=false -Dcom.sun.management.jmxremote.authenticate=true -Dcom.sun.management.jmxremote.password.file=../conf/jmxremote.password -Dcom.sun.management.jmxremote.access.file=../conf/jmxremote.access
 set CATALINA_OPTS=%CATALINA_OPTS% %JMX_REMOTE_CONFIG%

③ 复制并修改授权文件

$JAVA_HOME/jre/lib/management下有jmxremote.access和jmxremote.password的模板文件，将两个文件复制到$CATALINA_BASE/conf目录下
◆ 修改$CATALINA_BASE/conf/jmxremote.access 添加内容：
     monitorRole readonly
     controlRole readwrite
◆ 修改$CATALINA_BASE/conf/jmxremote.password 添加内容：
     monitorRole chenfeng
     controlRole chenfeng
注意： 如果进行了以上步骤导致Tomcat启动不了，那么很可能是密码文件的权限问题
需要修改jmxremote.password文件的访问权限，只有运行Tomcat的用户才能拥有访问权限 ：
      Windows的NTFS文件系统下，选中文件，点右键 -->“属性”-->“安全”--> 点“高级”--> 点“更改权限”--> 去掉“从父项继承....”--> 弹出窗口中选“删除”，这样就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（或用户组，如果选用户不行那就选用户组），例administrator，点“确定"，“确定"。来到权限项目窗口，勾选“完全控制”，点“确定”，OK了。
官方的提示：
      The password file should be read-only and only accessible by the operating system user Tomcat is running as.

④验证配置

重新启动Tomcat，在Windows命令行输入“netstat -a”查看配置的端口号是否已打开，如果打开，说明上面的配置成功了。

⑤ 使用jconsole测试JMX

运行$JAVA_HOME/bin目录下的jconsole.exe，打开J2SE监视和管理控制台，然后建立连接，如果是本地的Tomcat则直接选择然后点击连接，如果是远程的，则进入远程选项卡，填写地址、端口号、用户名、口令即可连接。。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。

二、使用JMX监控Tomcat示例代码

 String jmxURL = "service:jmx:rmi:///jndi/rmi://192.168.10.93:8999/jmxrmi";
 JMXServiceURL serviceURL = new JMXServiceURL(jmxURL);

 Map map = new HashMap();
 // 用户名密码，在jmxremote.password文件中查看
 String[] credentials = new String[] { "monitorRole", "tomcat" };
 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);

 // tomcat的线程数对应的属性值
 String attrName = "currentThreadCount";
 MBeanAttributeInfo[] mbAttributes = mbInfo.getAttributes();
 System.out.println("currentThreadCount:" + mbsc.getAttribute(threadObjName, attrName));

三、完整的示例代码文件

 import java.lang.management.MemoryUsage;
 import java.text.SimpleDateFormat;
 import java.util.Date;
 import java.util.Formatter;
 import java.util.HashMap;
 import java.util.Iterator;
 import java.util.Map;
 import java.util.Set;

 import javax.management.MBeanAttributeInfo;
 import javax.management.MBeanInfo;
 import javax.management.MBeanServerConnection;
 import javax.management.ObjectInstance;
 import javax.management.ObjectName;
 import javax.management.openmbean.CompositeDataSupport;
 import javax.management.remote.JMXConnector;
 import javax.management.remote.JMXConnectorFactory;
 import javax.management.remote.JMXServiceURL;
 /**
  * @author liuyazhuang
  * @date 2016-05-31
  */
 public class JMXTest {

     /**
      * main方法
      * @param args
      */
     public static void main(String[] args) {
         try {

             String jmxURL = "service:jmx:rmi:///jndi/rmi://127.0.0.1:8999/jmxrmi";

             JMXServiceURL serviceURL = new JMXServiceURL(jmxURL);

             Map map = new HashMap();
             String[] credentials = new String[] { "monitorRole", "tomcat" };
             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 < mbsc.getDomains().length; j++) {
                 System.out.println("###########" + mbsc.getDomains()[j]);
             }
             Set MBeanset = mbsc.queryMBeans(null, null);
             System.out.println("MBeanset.size() : " + MBeanset.size());
             Iterator MBeansetIterator = MBeanset.iterator();
             while (MBeansetIterator.hasNext()) {
                 ObjectInstance objectInstance = (ObjectInstance) MBeansetIterator
                         .next();
                 ObjectName objectName = objectInstance.getObjectName();
                 String canonicalName = objectName.getCanonicalName();
                 System.out.println("canonicalName : " + canonicalName);
                 if (canonicalName
                         .equals("Catalina:host=localhost,type=Cluster")) {
                     // Get details of cluster MBeans
                     System.out.println("Cluster MBeans Details:");
                     System.out
                             .println("=========================================");
                     // getMBeansDetails(canonicalName);
                     String canonicalKeyPropList = objectName
                             .getCanonicalKeyPropertyListString();
                 }
             }
             // ------------------------- system ----------------------
             ObjectName runtimeObjName = new ObjectName("java.lang:type=Runtime");
             System.out.println("厂商:"
                     + (String) mbsc.getAttribute(runtimeObjName, "VmVendor"));
             System.out.println("程序:"
                     + (String) mbsc.getAttribute(runtimeObjName, "VmName"));
             System.out.println("版本:"
                     + (String) mbsc.getAttribute(runtimeObjName, "VmVersion"));
             Date starttime = new Date((Long) mbsc.getAttribute(runtimeObjName,
                     "StartTime"));
             SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
             System.out.println("启动时间:" + df.format(starttime));

             Long timespan = (Long) mbsc.getAttribute(runtimeObjName, "Uptime");
             System.out.println("连续工作时间:" + JMXTest.formatTimeSpan(timespan));
             // ------------------------ JVM -------------------------
             // 堆使用率
             ObjectName heapObjName = new ObjectName("java.lang:type=Memory");
             MemoryUsage heapMemoryUsage = MemoryUsage
                     .from((CompositeDataSupport) mbsc.getAttribute(heapObjName,
                             "HeapMemoryUsage"));
             long maxMemory = heapMemoryUsage.getMax();// 堆最大
             long commitMemory = heapMemoryUsage.getCommitted();// 堆当前分配
             long usedMemory = heapMemoryUsage.getUsed();
             System.out.println("heap:" + (double) usedMemory * 100
                     / commitMemory + "%");// 堆使用率

             MemoryUsage nonheapMemoryUsage = MemoryUsage
                     .from((CompositeDataSupport) mbsc.getAttribute(heapObjName,
                             "NonHeapMemoryUsage"));
             long noncommitMemory = nonheapMemoryUsage.getCommitted();
             long nonusedMemory = heapMemoryUsage.getUsed();
             System.out.println("nonheap:" + (double) nonusedMemory * 100
                     / noncommitMemory + "%");

             ObjectName permObjName = new ObjectName(
                     "java.lang:type=MemoryPool,name=Perm Gen");
             MemoryUsage permGenUsage = MemoryUsage
                     .from((CompositeDataSupport) mbsc.getAttribute(permObjName,
                             "Usage"));
             long committed = permGenUsage.getCommitted();// 持久堆大小
             long used = heapMemoryUsage.getUsed();//
             System.out.println("perm gen:" + (double) used * 100 / committed
                     + "%");// 持久堆使用率

             // -------------------- Session ---------------
             ObjectName managerObjName = new ObjectName(
                     "Catalina:type=Manager,*");
             Set 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();
     }
 }