Java代码查看Tomcat运行状态

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();
}