服务器场集群操控雏形-优快云博客

本文链接：https://blog.youkuaiyun.com/linux_wang130/article/details/9709219

本文介绍了如何使用JavaServlet和HttpClient实现与Tomcat的客户端交互，包括关闭Tomcat服务及服务端响应客户端请求。通过Java编程实现远程控制Tomcat，展示了Java在Web应用开发中的灵活性。

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利用java servlet来实现：

客户端雏形：
package cat.manager.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class Switch extends HttpServlet {
public void doGet(HttpServletRequest req,HttpServletResponse resp)throws IOException,ServletException{
  req.setCharacterEncoding("utf-8");
  //String swi=(String)req.getParameter("startuptomcat");
  Runtime rt=Runtime.getRuntime();
  String cmd=" /home/reManager/tomcatClient/bin/shutdown.sh";
  Process proc=rt.exec(cmd);
  //System.out.println(swi);
}
public void doPost(HttpServletRequest req,HttpServletResponse resp)throws IOException,ServletException{

}
}

servlet注册：
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
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 ">

<servlet>
  <servlet-name>cat</servlet-name>
  <servlet-class>cat.manager.servlet.Switch</servlet-class>
</servlet>
<servlet-mapping>
  <servlet-name>cat</servlet-name>
  <url-pattern>/cat</url-pattern>
</servlet-mapping>

<welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>

服务端（使用java命令调用HttpClient来实现）：
<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
String path = request.getContextPath();
String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";
%>

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <base href="<%=basePath%>">

    <title>My JSP 'index.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">

</head>

<body>
    This is my JSP page. <br>
    <form action=" http://192.168.2.19:2080/cat " method="get">
    select the type of operation:<br/>
    <input type="text" name="startuptomcat"/>
    <input type="submit" value="submit">
    </form>
</body>
</html>