检测tomcat服务状态，自动重启Tomcat(java实现)

zdc253212956

原理很简单。 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，可简单实现Tomcat HA.

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) {

}
}
}
}



另一种方式：监控日志
由于tomcat部署的应用，在客户使用的过程中，每过五六天总会吊死成僵尸进程，查看日志为无效的变元，搜遍网络，尝试了很多办法也没有解决此问题。同时不能更换web容器，因为会增加成本，只好用java写了个监控程序，目前正在测试中

import java.net.URL;
import java.net.URLConnection;
import java.text.SimpleDateFormat;
import java.util.Date;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
import java.util.TimeZone;


/**
* NAME : tomcat.java
* FUNCTION : 监控服务器tomcat状态
* PROGRAMMED : TELSTAR/jlsu
* DATE(ORG) : 20090109
* PROJECT : TELSTAR
* OS : HP-UNIX
* HISTORY :
*/

public class TomcatDetector {

private long sJKdate;

public TomcatDetector() {
Date now = new Date();
sJKdate = now.getTime();

}

private static final Logger logger = Logger.getLogger(TomcatDetector.class);

private static void keepTomcatAlive() throws NullPointerException {
String s;
boolean isTomcatAlive = false;
java.io.BufferedReader in;
Date now = new Date();
long lnow = now.getTime();
Date selDate = new Date();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
df.setTimeZone(TimeZone.getTimeZone("Etc/GMT-8"));
String sSel_date = df.format(selDate);
try {
URL url = new URL("http://133.128.4.7:8080/index.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) {
// 如果in.readLine的内容不为空，则证明当前的tomcat容器可用，不过操作直接返回
return;
}
}
in.close();
} catch (Exception ex) {
}
try {
java.lang.Process p = java.lang.Runtime.getRuntime().exec("ps -ef | grep Djava.uti | grep -v tail | grep -v vi | grep -v grep | awk '{print $2}'");
in = new java.io.BufferedReader(new java.io.InputStreamReader(p.getInputStream()));
while ((s = in.readLine()) != null) {
isTomcatAlive = true;
break;
}
in.close();
} catch (Exception e) {
e.printStackTrace();
}
if (isTomcatAlive) {
logger.debug(sSel_date + "> Tomcat is alive but not response!");
stopTomcat();
}
startTomcat();
}

public static void stopTomcat() {
Date now = new Date();
long lnow = now.getTime();
Date selDate = new Date();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
df.setTimeZone(TimeZone.getTimeZone("Etc/GMT-8"));
String sSel_date = df.format(selDate);
try {
logger.debug("------------------开始杀死僵尸tomcat---------------------");

java.lang.Process p = java.lang.Runtime.getRuntime().exec("kill -9 `ps -ef | grep Djava.uti | grep -v tail | grep -v vi | grep -v grep | awk '{print $2}'`");
java.lang.Process p1 = java.lang.Runtime.getRuntime().exec("ps -ef |grep java | grep -v vi | grep -v tail | grep -v grep");
java.io.BufferedReader in = new java.io.BufferedReader(new java.io.InputStreamReader(p1.getInputStream()));
String s;
String t = "Djava";
boolean restart = false;
while ((s = in.readLine()) != null) {
if (s.indexOf(t) == -1) {
restart = true;
break;
}
}
logger.debug( sSel_date + "> Tomcat is stop " + (restart ? "OK" : "ERROR"));
} catch (Exception e) {
e.printStackTrace();
}
}

public static void startTomcat() {
Date now = new Date();
long lnow = now.getTime();
Date selDate = new Date();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
df.setTimeZone(TimeZone.getTimeZone("Etc/GMT-8"));
String sSel_date = df.format(selDate);
try {
java.lang.Process p = java.lang.Runtime.getRuntime().exec("kill -9 `ps -ef | grep Djava.uti | grep -v tail | grep -v vi | grep -v grep | awk '{print $2}'`");

} catch (Exception e) {
e.printStackTrace();
}
try {
logger.debug("------------------开始重启---------------------");
java.lang.Process p1 = java.lang.Runtime.getRuntime().exec("/telstar/tomcat/bin/./startup.sh &");
java.io.BufferedReader in = new java.io.BufferedReader(new java.io.InputStreamReader(p1.getInputStream()));
String s;
String t = "tomcat";
boolean restart = false;
while ((s = in.readLine()) != null) {
if (s.indexOf(t) != -1) {
restart = true;
break;
}
}
logger.debug( sSel_date + "> Tomcat is start " + (restart ? "OK" : "ERROR"));
} catch (Exception e) {
e.printStackTrace();
}
}

public static void main(String[] args) {
Date now = new Date();
long lnow = now.getTime();
Date selDate = new Date();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
df.setTimeZone(TimeZone.getTimeZone("Etc/GMT-8"));
String sSel_date = df.format(selDate);
PropertyConfigurator.configure("/telstar/bin/tomcatJK/logtomcatJK.properties");
logger.debug("------------------开始监控---------------------");
while (true) {
try {
TomcatDetector.keepTomcatAlive();
logger.debug("------------------检测tomcat状态---------------------");
Thread.sleep(24000);
} catch (Exception ex) {
}
}
}
}