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) {
           }
       }
    }

}