JAVA程序获取Tomcat的运行状态

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用浏览器来查看Tomcat的运行状态：

配置Tomcat的管理用户和权限。

打开%Tomcat_Home%/conf/目录下的tomcat-user.xml文件，配置以下内容：

<role rolename="manager-status"/><role rolename="manager"/>  <role rolename="manager-jmx"/> <role rolename="manager-gui"/><role rolename="manager-script"/><role rolename="admin"/> <user username="tomcat" password="tomcat" roles="tomcat"/>  <user username="admin" password="tomcat" roles="manager,manager-gui,admin,manager-status,manager-jmx,manager-script"/>

此时可通过admin用户来访问tomcat的状态，在浏览器地址中输入：

http://localhost:8080/manager/status?XML=true

输入用户名：admin,密码：tomcat. 出现以下页面，即Tomcat的运行状态。

或者可以直接访问：

http://admin:tomcat@localhost :8080/manager/status?XML=true

Java程序获取Tomcat运行状态：

根据上面的思路，可以通过URL来获取Tomcat manager返回的信息，再解析这个信息就可以了，参考cacti的监控方式中，用perl编写的监控模板也是如此，如下：

my $host = shift; my $username = shift; my $password = shift; my $connector = shift or &usage; my $url = "http://$username:$password"."\@$host/manager/status?XML=true";  my $xml = `GET $url`;  my $status = XMLin($xml);

因此Java也可参考此方法：

@Test    public void test1() throws IOException {        URL url = null;        InputStream is = null;        StringBuffer resultBuffer = new StringBuffer();        BufferedReader breader = null;        try {            url = new URL(                    "http://admin:tomcat@localhost:8080/manager/status?XML=true");            HttpURLConnection conn = (HttpURLConnection) url.openConnection();            is = conn.getInputStream();             breader = new BufferedReader(new InputStreamReader(is));            String line = "";            while ((line = breader.readLine()) != null) {                resultBuffer.append(line);            }        } catch (MalformedURLException e) {            e.printStackTrace();        } finally {            if (breader != null)                breader.close();            if (is != null)                is.close();        }        System.out.println(resultBuffer.toString());    }

运行时出现如下错误：

java.io.IOException: Server returned HTTP response code: 401 for URL: http://admin:tomcat@localhost:8080/manager/status?XML=true    at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1625)    at com.merit.monitor.tomcat.TestTomcatStatus.test1(TestTomcatStatus.java:57)    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)    at java.lang.reflect.Method.invoke(Method.java:606)    at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)    at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)    at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)    at org.junit.runners.ParentRunner.run(ParentRunner.java:236)    at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)

出错原因可以去stackoverview上查看，这里直接给出正确的解决方法：

1、编写获取Tomcat状态的字符串方法：

/**      * @Description: 获取指定URL的内容      * @Version1.0 2014-7-23 下午02:18:22 by xuqiang（xuqiang@merit.com）创建      * @param tempurl url地址      * @param username tomcat 管理用户名      * @param password tomcat 管理用户密码      * @return      * @throws IOException      */    public static String getHtmlContext(String tempurl, String username, String password) throws IOException {        URL url = null;        BufferedReader breader = null;        InputStream is = null;        StringBuffer resultBuffer = new StringBuffer();        try {            url = new URL(tempurl);            String userPassword = username + ":" + password;            String encoding = new sun.misc.BASE64Encoder().encode (userPassword.getBytes());//在classpath中添加rt.jar包，在%java_home%/jre/lib/rt.jar             HttpURLConnection conn = (HttpURLConnection) url.openConnection();            conn.setRequestProperty("Authorization", "Basic " + encoding);            is = conn.getInputStream();            breader = new BufferedReader(new InputStreamReader(is));            String line = "";            while ((line = breader.readLine()) != null) {                resultBuffer.append(line);            }        } catch (MalformedURLException e) {            e.printStackTrace();        } finally {            if(breader != null)                breader.close();            if(is != null)                is.close();        }        return resultBuffer.toString();    }

2、编写测试方法：

@Test    public void test() {        String result = "";        Document document = null;//引入org.dom4j包        try {            result = GetHtmlContext.getHtmlContext("http://localhost:8080/manager/status?XML=true", "admin", "tomcat");            document = DocumentHelper.parseText(result);//将字符串转化为XML的Document        } catch (IOException e) {            e.printStackTrace();        } catch (DocumentException e) {            e.printStackTrace();        }        System.out.println(document.asXML());    }

运行junit,正常打印监控状态的XML格式内容。这样就可以解析XML Dom的值获取Tomcat的运行状态。

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