检测tomcat服务状态，并能自动重启的代码

来源：http://java0note.blog.51cto.com/469557/110003

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 


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) { 

            } 
        } 
    } 
} 

远程重启 tomcat

测试成功，jsp 代码如下：
<%@ page language="java" contentType="text/html; charset=GB18030" pageEncoding="GB18030"%>
<%
Runtime   run   =   Runtime.getRuntime();   
Process   pro   =   run.exec("d:\\tomcat\\bin\\restart.bat");   // 替换为你的路径，linux下为.sh ， 如果单独调用 shutdown.bat 就关闭了。 单独启动没戏，因为tomcat已经停了
%>


restart.bat
call shutdown.bat
delay.exe 5
call startup.bat
唯一的问题，你需要一个延迟程序,就是那个 delay.exe 5, 否则可能还没有关闭就启动了，80端口被占用 
如果是服务，就更简单了,restart.bat 里面写上 net stop Tomcat 和 net start Tomcat 就可以了！