集群cpu使用率监控系统的简单实现（二）监控端的实现_监控系统中 cpu 平均利用率-优快云博客

本文链接：https://blog.youkuaiyun.com/HEYUTAO007/article/details/5693521

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