JAVA实现监测tomcat是否宕机及控制重启的方法

本文实例讲述了java实现监测tomcat是否宕机及控制重启的方法。分享给大家供大家参考。具体如下：

detector.java:

import java.net.url;
import java.net.urlconnection;
import java.util.date;
/**
* 
* @author james
*
*/
public class detector {
private static void keeptomcatalive() throws nullpointerexception {
string s;
string t = new string("tomcat6");
boolean istomcatalive = false;
java.io.bufferedreader in;
system.setproperty("sun.net.client.defaultconnecttimeout", "8000");  
system.setproperty("sun.net.client.defaultreadtimeout", "10000"); 
try {
  url url = new url("http://localhost:8080/test.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) {
    //accessed page successful.
    return;
    }
  }
  in.close();
} catch (exception ex) {
     //ex.printstacktrace();
  }
try {
  java.lang.process p = java.lang.runtime.getruntime().exec("ps -aux");
  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("/etc/init.d/tomcat6 stop");
    java.io.bufferedreader in = new java.io.bufferedreader(new java.io.inputstreamreader(p.getinputstream()));
    string s;
    string t = "stopping";
    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("/etc/init.d/tomcat6 start");
    java.io.bufferedreader in = new java.io.bufferedreader(new java.io.inputstreamreader(p.getinputstream()));
    string s;
    string t = "starting";
    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();
  }
}
private static void debug(string msg){
  system.out.println("debug::: "+msg);
}
public static void main(string[] args) {
  while (true) {
      try {  
                debug("detect agin <"+new date()+">");
        detector.keeptomcatalive();
                debug("sleep...");
        thread.sleep(30000);
      } catch (exception ex) {
              ex.printstacktrace();
      }
    }
}
}

希望本文所述对大家的java程序设计有所帮助。