检测tomcat服务状态，自动重启Tomcat(java实现)

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) { 
 
  
 
           } 
 
       } 
 
    } 
} 

另一种方式：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) { 
 
           } 
 
       } 
 
    } 
 }