集群cpu使用率监控系统的简单实现（二）监控端的实现

来源：互联网发布：广州城中村网络被承包编辑：程序博客网时间：2024/04/30 02:58

1 在webapps文件夹下新建文件夹monitor

2 monitor下新建WEB-INF和src

3 WEB-INF里面新建web.xml和classes

4 web.xml内容

<?xml version="1.0" encoding="ISO-8859-1"?><web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <description> Monitoring cpu,mem,disk and netstate </description> <display-name>MyMonitor</display-name>  <servlet> <servlet-name>recvInfo</servlet-name> <servlet-class>recvInfo</servlet-class> </servlet> <servlet-mapping> <servlet-name>recvInfo</servlet-name> <url-pattern>/recvInfo</url-pattern> </servlet-mapping> </web-app>

5 下面就是写处理接受的servlet了。如下：

import java.io.IOException;import java.io.PrintWriter;import java.io.FileReader;import java.io.BufferedReader;import java.io.FileWriter;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class recvInfo extends HttpServlet {public void doPost(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {// Returns the value of a request parameter as a String, or null if the// parameter does not exist.String cpu = request.getParameter("cpu");if (null != cpu) {FileWriter fw = new FileWriter("/opt/apache-tomcat-6.0.26/webapps/monitor/WEB-INF/classes/cpu.txt", true);PrintWriter pw = new PrintWriter(fw);pw.println(cpu);pw.close();fw.close();} else {response.setContentType("text/html");PrintWriter out = response.getWriter();out.println("<html>");out.println("<body>");out.println("<head>");out.println("</head>");out.println("<body>");FileReader fr = new FileReader("/opt/apache-tomcat-6.0.26/webapps/monitor/WEB-INF/classes/cpu.txt"); BufferedReader br = new BufferedReader(fr); String aRow = null; while ((aRow = br.readLine()) != null) out.println("<br>"+aRow+"<br>"); out.println("</body>");out.println("</html>");fr.close();br.close();out.close();}}public void doGet(HttpServletRequest request, HttpServletResponse response)throws ServletException, IOException {doPost(request, response);}}

作用就是如果是curl发送的请求，则取出cpu参数的值，写到cpu.txt文件中。如果是用户使用浏览器访问这个servlet，http://localhost:8080/monitor/recvInfo

则读cpu.txt文件，将内容通过html写到用户的浏览器中。

编译该java文件到WEB-INF的classes中：

javac -classpath /opt/apache-tomcat-6.0.26/lib/servlet-api.jar -d /opt/apache-tomcat-6.0.26/webapps/monitor/WEB-INF/classes recvInfo.java

6 启动tomcat

sudo -E ./startup.sh

关闭用sudo ./shutdown.sh

7 启动被监控端的cpu.sh，他开始搜集本机cpu使用率，并向监控端recvInfo servlet发送http请求。

8 过几秒后，ctrl+c停止cpu.sh，看监控端的结果：

(1)cpu.txt

(2)使用浏览器访问servlet，http://localhost:8080/monitor/recvInfo

9 也可以使用浏览器http://localhost:8080/monitor/recvInfo?cpu=123提交cpu数据。就不改正这个bug了吧。