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servlet实现控制台输出用户名和密码的相关步骤和代码

2016-06-24 15:51 225 查看

1、创建一个servlet，命名ServletDemo1，在浏览中访问该servlet
代码如下：

package servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ServletDemo1 extends HttpServlet {

/**

* Constructor of the object.

*/

public ServletDemo1() {

 super();

}

/**

* Destruction of the servlet. 

*/

public void destroy() {

 super.destroy(); // Just puts "destroy" string in log

 // Put your code here

}

/**

* The doGet method of the servlet. 

*

* This method is called when a form has its tag value method equals to get.

*

* @param request the request send by the client to the server

* @param response the response send by the server to the client

* @throws ServletException if an error occurred

* @throws IOException if an error occurred

*/

public void doGet(HttpServletRequest request, HttpServletResponse response)

 throws ServletException, IOException {

 String mes=request.getParameter("mes");

 System.out.print(mes);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

 throws ServletException, IOException {

this.doGet(request, response);

}

/**

* Initialization of the servlet. 

* @throws ServletException if an error occurs

*/

public void init() throws ServletException {

 // Put your code here

}

}

2、创建一个带超链接的jsp页面，超链接到ServletDemo2,在控制台输出jsp页面通过超链接参数传递的用户名和密码。

Index.jsp 代码参考

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>

<%

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>

 <a href="/ZY/ServletDemo2?name=zy&&pass=123">hahhahahhahaha</a>

</body>

</html>

</html>

SevletDemo2.java 代码参考

package servlet;

import java.io.IOException;

import java.io.PrintWriter;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class ServletDemo2 extends HttpServlet {

/**

* Constructor of the object.

*/

public ServletDemo2() {

 super();

}

/**

* Destruction of the servlet. 

*/

public void destroy() {

 super.destroy(); // Just puts "destroy" string in log

 // Put your code here

}

/**

* The doGet method of the servlet. 

*

* This method is called when a form has its tag value method equals to get.

*

* @param request the request send by the client to the server

* @param response the response send by the server to the client

* @throws ServletException if an error occurred

* @throws IOException if an error occurred

*/

public void doGet(HttpServletRequest request, HttpServletResponse response)

 throws ServletException, IOException {

 String name=request.getParameter("name");

 String pass=request.getParameter("pass");

 System.out.println("用户名:"+name);

 System.out.println("密码:"+pass);

}

public void doPost(HttpServletRequest request, HttpServletResponse response)

 throws ServletException, IOException {

this.doGet(request, response);

}

/**

* Initialization of the servlet. 

*

* @throws ServletException if an error occurs

*/

public void init() throws ServletException {

 // Put your code here

}

}

3、创建一个用户登录的jsp页面，用户在表单中输入用户名和密码，提交后跳转到ServletDemo3，在控制台输出用户名和密码。

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标签： servlet 控制台

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