监测tomcat是否宕机，控制重启代码,Java代码库,德仔网

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【Java】监测tomcat是否宕机，控制重启

作者:水熊宝宝 / 发布于2013/8/5/ 1241

判断tomcat是否宕机，如果宕机，则进行重启。java实现。


	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();
	 }
	 }
	}
	
	}

试试其它关键字

　tomcat　

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