【转载】监视Tomcat宕机并重启Tomcat

下面的代码从网上找的，稍加了点注释。

/**
 * 监视Tomcat是否宕机，如果宕机就会自动重启
 */
package cn.ipcat;

import java.net.URL;
import java.net.URLConnection;
import java.util.Date;

public class Detector {

	public static void main(String[] args) {
		while (true) {
			try {
				System.out.println(" <" + new Date() + "> 检查服务器是否宕机...");
				Detector.keepTomcatAlive();
				// 每10分钟执行一次
				Thread.sleep(600000);
			} catch (Exception ex) {
				ex.printStackTrace();
			}
		}
	}

	private static void keepTomcatAlive() throws NullPointerException {
		String s;
		String t = new String("tomcat6.exe");
		boolean isTomcatAlive = false;
		java.io.BufferedReader in;
		try {
			URL url = new URL("http://www.ipcat.cn");
			URLConnection con = url.openConnection();
			in = new java.io.BufferedReader(new java.io.InputStreamReader(con
					.getInputStream()));
			con.setConnectTimeout(5000);
			con.setReadTimeout(10000);
			while ((s = in.readLine()) != null) {
				if (s.length() > 0) {
					// 如果能够读取到页面则证明可用
					System.out.println(" <" + new Date() + "> 正常！");
					return;
				}
			}
			in.close();
		} catch (Exception ex) {
			ex.printStackTrace();
		}

		try {
			// 判断任务列表中是否存在tomcat6.exe进程
			// 如果存在且不响应，这就表明tomcat已经宕机了，需要重启tomcat
			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 tomcat2 /y");
			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 tomcat2 /y");
		} catch (Exception e) {
			e.printStackTrace();
		}
		try {
			java.lang.Process p = java.lang.Runtime.getRuntime().exec(
					"net start tomcat2");
			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();
		}
	}
}

评论

1 楼 nbsven 2010-03-22  

用UFO做网站的web server可以实现对网站监控，随时查看网站的运营状态，UFO内置的
UFO Probe实时监测UFO Web Server的重要运行数据。UFO的性能可查看：
http://www.oschina.net/bbs/thread/4309
http://www.oschina.net/bbs/thread/4310