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:
importjava.net.URL;
importjava.net.URLConnection;
importjava.util.Date;
/**
*
*@authorjames
*
*/
publicclassDetector{
privatestaticvoidkeepTomcatAlive()throwsNullPointerException{
Strings;
Stringt=newString("tomcat6");
booleanisTomcatAlive=false;
java.io.BufferedReaderin;
System.setProperty("sun.net.client.defaultConnectTimeout","8000");
System.setProperty("sun.net.client.defaultReadTimeout","10000");
try{
URLurl=newURL("http://localhost:8080/test.jsp");
URLConnectioncon=url.openConnection();
in=newjava.io.BufferedReader(newjava.io.InputStreamReader(con.getInputStream()));
con.setConnectTimeout(1000);
con.setReadTimeout(4000);
while((s=in.readLine())!=null){
if(s.length()>0){
//accessedpagesuccessful.
return;
}
}
in.close();
}catch(Exceptionex){
//ex.printStackTrace();
}
try{
java.lang.Processp=java.lang.Runtime.getRuntime().exec("ps-aux");
in=newjava.io.BufferedReader(newjava.io.InputStreamReader(p.getInputStream()));
while((s=in.readLine())!=null){
if(s.startsWith(t)){
isTomcatAlive=true;
break;
}
}
in.close();
}catch(Exceptione){
e.printStackTrace();
}
if(isTomcatAlive){
System.out.println("<"+newDate()+">Tomcatisalivebutnotresponse!");
stopTomcat();
}
startTomcat();
}
publicstaticvoidstopTomcat(){
try{
java.lang.Processp=java.lang.Runtime.getRuntime().exec("/etc/init.d/tomcat6stop");
java.io.BufferedReaderin=newjava.io.BufferedReader(newjava.io.InputStreamReader(p.getInputStream()));
Strings;
Stringt="Stopping";
booleanrestart=false;
while((s=in.readLine())!=null){
if(s.indexOf(t)!=-1){
restart=true;
break;
}
}
System.out.println("<"+newDate()+">Tomcatisstop"+(restart?"OK":"ERROR"));
}catch(Exceptione){
e.printStackTrace();
}
}
publicstaticvoidstartTomcat(){
try{
java.lang.Processp=java.lang.Runtime.getRuntime().exec("/etc/init.d/tomcat6start");
java.io.BufferedReaderin=newjava.io.BufferedReader(newjava.io.InputStreamReader(p.getInputStream()));
Strings;
Stringt="Starting";
booleanrestart=false;
while((s=in.readLine())!=null){
if(s.indexOf(t)!=-1){
restart=true;
break;
}
}
System.out.println("<"+newDate()+">Tomcatisstart"+(restart?"OK":"ERROR"));
}catch(Exceptione){
e.printStackTrace();
}
}
privatestaticvoiddebug(Stringmsg){
System.out.println("Debug:::"+msg);
}
publicstaticvoidmain(String[]args){
while(true){
try{
debug("Detectagin<"+newDate()+">");
Detector.keepTomcatAlive();
debug("Sleep...");
Thread.sleep(30000);
}catch(Exceptionex){
ex.printStackTrace();
}
}
}
}
希望本文所述对大家的java程序设计有所帮助。