本文實例講述了JAVA實現監測tomcat是否宕機及控制重啟的方法。分享給大家供大家參考。具體如下：
Detector.java:
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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(); } }}} |
希望本文所述對大家的java程序設計有所幫助。
