检测tomcat服务状态，自动重启Tomcat

第一种方式：监控请求


原理很简单。 在机器上做一个测试的文件。如果我们的程序能够读取到这个文件，则证明运行正常，可简单实现Tomcat HA.



import java.net.URL;

import java.net.URLConnection;

import java.util.Date;



public class Detector {

    private static void keepTomcatAlive() throws NullPointerException {

       String s;

       String t = new String("tomcat5.exe");

       boolean isTomcatAlive = false;

       java.io.BufferedReader in;

       try {

           URL url = new URL("http://localhost/heartbeat.htm");

           URLConnection con = url.openConnection();

           in = new java.io.BufferedReader(new java.io.InputStreamReader(con

                  .getInputStream()));

           con.setConnectTimeout(1000);

           con.setReadTimeout(4000);

           while ((s = in.readLine()) != null) {

              if (s.length() > 0) {

                  // 如果能够读取到页面则证明可用

                  return;

              }

           }

           in.close();

       } catch (Exception ex) {

       }



       try {

           java.lang.Process p = java.lang.Runtime.getRuntime().exec(

                  "tasklist");



           in = new java.io.BufferedReader(new java.io.InputStreamReader(p

                  .getInputStream()));



           while ((s = in.readLine()) != null) {

              if (s.startsWith(t)) {

                  isTomcatAlive = true;

                  break;

              }

           }

           in.close();

       } catch (Exception e) {

           e.printStackTrace();

       }

       if (isTomcatAlive) {

           System.out.println("<" + new Date()

                  + "> Tomcat is alive but not response!");

           stopTomcat();

       }

       startTomcat();

    }



    public static void stopTomcat() {

       try {

           java.lang.Process p = java.lang.Runtime.getRuntime().exec(

                  "net stop /"Apache Tomcat/"");

           java.io.BufferedReader in = new java.io.BufferedReader(

                  new java.io.InputStreamReader(p.getInputStream()));

           String s;

           String t = "成功停止";

           boolean restart = false;

           while ((s = in.readLine()) != null) {

              if (s.indexOf(t) != -1) {

                  restart = true;

                  break;

              }

           }

           System.out.println("<" + new Date() + "> Tomcat is stop "

                  + (restart ? "OK" : "ERROR"));

       } catch (Exception e) {

           e.printStackTrace();

       }

    }



    public static void startTomcat() {

       try {

           java.lang.Process p = java.lang.Runtime.getRuntime().exec(

                  "net stop /"Apache Tomcat/"");

       } catch (Exception e) {

           e.printStackTrace();

       }

       try {

           java.lang.Process p = java.lang.Runtime.getRuntime().exec(

                  "net start /"Apache Tomcat/"");

           java.io.BufferedReader in = new java.io.BufferedReader(

                  new java.io.InputStreamReader(p.getInputStream()));

           String s;

           String t = "启动成功";

           boolean restart = false;

           while ((s = in.readLine()) != null) {

              if (s.indexOf(t) != -1) {

                  restart = true;

                  break;

              }

           }

           System.out.println("<" + new Date() + "> Tomcat is start "

                  + (restart ? "OK" : "ERROR"));

       } catch (Exception e) {

           e.printStackTrace();

       }

    }



    public static void main(String[] args) {

       while (true) {

           try {

              Detector.keepTomcatAlive();

              Thread.sleep(30000);

           } catch (Exception ex) {



           }

       }

    }



}



第二种方式：监控日志
由于tomcat部署的应用，在客户使用的过程中，每过五六天总会吊死成僵尸进程，查看日志为无效的变元，搜遍网络，尝试了很多办法也没有解决此问题。同时不能更换web容器，因为会增加成本，只好用java写了个监控程序，目前正在测试中

import java.net.URL;

import java.net.URLConnection;

import java.text.SimpleDateFormat;

import java.util.Date;

import org.apache.log4j.Logger;

import org.apache.log4j.PropertyConfigurator;

import java.util.TimeZone;





/**

* NAME : tomcat.java

* FUNCTION : 监控服务器tomcat状态

* PROGRAMMED : TELSTAR/jlsu

* DATE(ORG) : 20090109

* PROJECT : TELSTAR

* OS : HP-UNIX

* HISTORY :

*/



public class TomcatDetector {



    private long sJKdate;



    public TomcatDetector() {

       Date now = new Date();

       sJKdate = now.getTime();



    }



    private static final Logger logger = Logger.getLogger(TomcatDetector.class);



    private static void keepTomcatAlive() throws NullPointerException {

    String s;

    boolean isTomcatAlive = false;

    java.io.BufferedReader in;

     Date now = new Date();

        long lnow = now.getTime();

        Date selDate = new Date();

        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        df.setTimeZone(TimeZone.getTimeZone("Etc/GMT-8"));

        String sSel_date = df.format(selDate);

    try {

      URL url = new URL("http://133.128.4.7:8080/index.jsp");

      URLConnection con = url.openConnection();

      in = new java.io.BufferedReader(new java.io.InputStreamReader(con.getInputStream()));

      con.setConnectTimeout(1000);

      con.setReadTimeout(4000);

      while ((s = in.readLine()) != null) {

        if (s.length() > 0) {

          // 如果in.readLine的内容不为空，则证明当前的tomcat容器可用，不过操作直接返回

          return;

        }

      }

      in.close();

    } catch (Exception ex) {

    }

    try {

      java.lang.Process p = java.lang.Runtime.getRuntime().exec("ps -ef | grep Djava.uti | grep -v tail | grep -v vi | grep -v grep | awk '{print $2}'");

      in = new java.io.BufferedReader(new java.io.InputStreamReader(p.getInputStream()));

      while ((s = in.readLine()) != null) {

          isTomcatAlive = true;

          break;

      }

      in.close();

    } catch (Exception e) {

      e.printStackTrace();

    }

    if (isTomcatAlive) {

      logger.debug(sSel_date + "> Tomcat is alive but not response!");

      stopTomcat();

    }

    startTomcat();

  }



    public static void stopTomcat() {

         Date now = new Date();

        long lnow = now.getTime();

        Date selDate = new Date();

        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        df.setTimeZone(TimeZone.getTimeZone("Etc/GMT-8"));

        String sSel_date = df.format(selDate);

    try {

         logger.debug("------------------开始杀死僵尸tomcat---------------------");

    

    java.lang.Process p = java.lang.Runtime.getRuntime().exec("kill -9 `ps -ef | grep Djava.uti | grep -v tail | grep -v vi | grep -v grep | awk '{print $2}'`");

    java.lang.Process p1 = java.lang.Runtime.getRuntime().exec("ps -ef |grep java | grep -v vi | grep -v tail | grep -v grep");

      java.io.BufferedReader in = new java.io.BufferedReader(new java.io.InputStreamReader(p1.getInputStream()));

      String s;

      String t = "Djava";

      boolean restart = false;

      while ((s = in.readLine()) != null) {

        if (s.indexOf(t) == -1) {

          restart = true;

          break;

        }

      }

      logger.debug( sSel_date + "> Tomcat is stop " + (restart ? "OK" : "ERROR"));

    } catch (Exception e) {

      e.printStackTrace();

    }

  }



    public static void startTomcat() {

     Date now = new Date();

        long lnow = now.getTime();

        Date selDate = new Date();

        SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

        df.setTimeZone(TimeZone.getTimeZone("Etc/GMT-8"));

        String sSel_date = df.format(selDate);

    try {

        java.lang.Process p = java.lang.Runtime.getRuntime().exec("kill -9 `ps -ef | grep Djava.uti | grep -v tail | grep -v vi | grep -v grep | awk '{print $2}'`");

        

    } catch (Exception e) {

      e.printStackTrace();

    }

    try {

         logger.debug("------------------开始重启---------------------");

        java.lang.Process p1 = java.lang.Runtime.getRuntime().exec("/telstar/tomcat/bin/./startup.sh &");

      java.io.BufferedReader in = new java.io.BufferedReader(new java.io.InputStreamReader(p1.getInputStream()));

      String s;

      String t = "tomcat";

      boolean restart = false;

      while ((s = in.readLine()) != null) {

        if (s.indexOf(t) != -1) {

          restart = true;

          break;

        }

      }

      logger.debug( sSel_date + "> Tomcat is start " + (restart ? "OK" : "ERROR"));

    } catch (Exception e) {

      e.printStackTrace();

    }

  }



    public static void main(String[] args) {

       Date now = new Date();

       long lnow = now.getTime();

       Date selDate = new Date();

       SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

       df.setTimeZone(TimeZone.getTimeZone("Etc/GMT-8"));

       String sSel_date = df.format(selDate);

       PropertyConfigurator.configure("/telstar/bin/tomcatJK/logtomcatJK.properties");

       logger.debug("------------------开始监控---------------------");

       while (true) {

           try {

              TomcatDetector.keepTomcatAlive();

              logger.debug("------------------检测tomcat状态---------------------");

              Thread.sleep(24000);

           } catch (Exception ex) {

           }

       }

    }



}