HttpWebrequest来模拟登陆的全过程

根据我上面的几个小积累，其实平时饿get和post已经没问题了，有个特殊的post就是登陆。大家知道登陆问题在server端是session的问题，在客户端来post的时候其实还是cookie的问题，如何把cookie发送到server，并且server认为你是登陆成功了呢。这里给个例子，其实就是CookieContainer的使用，这个使用只需要附带进去就好了。也就是第一次请求的时候附带个空的给request，再次request的时候还是把这个给设置到request中去即可，第一次request带个空的去后，服务器端就把cookie的信息写到了这个container中了，你再次带这个container去request的话，服务器如果还是会从这个container里面找cookie或者再次放入点cookie的。整个代码如下，先发c#的模拟。再次发server端的验证代码：

 

 

using System;
using System.Collections.Generic;
using System.Text;
using System.Net;
using System.IO;
using System.Collections.Specialized; 

namespace post_test
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Begin...");

            Console.WriteLine("打开登陆页面...");

            // 设置cookie的container
            CookieContainer cookieContainer = new CookieContainer();

            // 设置一些公用的请求头
            NameValueCollection collection = new NameValueCollection();
            collection.Add("accept-language", "zh-cn,zh;q=0.5");
            collection.Add("accept-encoding", "gzip,deflate");
            collection.Add("accept-charset", "GB2312,utf-8;q=0.7,*;q=0.7");
            collection.Add("cache-control", "max-age=0");
            collection.Add("keep-alive", "115");

            // 先请求登陆页面
            HttpWebRequest requestLoginPage = (HttpWebRequest)WebRequest.Create("http://localhost:8080/test2/index.jsp");
            requestLoginPage.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            requestLoginPage.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13";
            requestLoginPage.Headers.Add(collection);
            HttpWebResponse responseLoginPage = (HttpWebResponse)requestLoginPage.GetResponse();
            Console.WriteLine("打开登陆页面状态:{0}", responseLoginPage.StatusCode);

            // 来Post数据到登陆页面
            HttpWebRequest requestLoginToPage = (HttpWebRequest)WebRequest.Create("http://localhost:8080/test2/servlet/LoginServlet");
            requestLoginToPage.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            requestLoginToPage.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13";
            requestLoginToPage.ContentType = "application/x-www-form-urlencoded";
            requestLoginToPage.Method = "POST";
            requestLoginToPage.Headers.Add(collection);

            requestLoginToPage.CookieContainer = cookieContainer;

            String data = "userName=admin&password=123456";
            byte[] bytes = Encoding.ASCII.GetBytes(data);
            requestLoginToPage.ContentLength = bytes.Length;
            Stream streamLoginToPage = requestLoginToPage.GetRequestStream();
            streamLoginToPage.Write(bytes, 0, bytes.Length);
            streamLoginToPage.Flush();
            streamLoginToPage.Close();
            HttpWebResponse responseLoginToPage = (HttpWebResponse)requestLoginToPage.GetResponse();
            Console.WriteLine("Post数据结果状态:{0}", responseLoginToPage.StatusCode);

            // 打开登陆状态页面
            HttpWebRequest requestResultPage = (HttpWebRequest)WebRequest.Create("http://localhost:8080/test2/result.jsp");
            requestResultPage.Accept = "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";
            requestResultPage.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv:1.9.2.13) Gecko/20101203 Firefox/3.6.13";
            requestResultPage.Headers.Add(collection);

            requestResultPage.CookieContainer = cookieContainer;

            HttpWebResponse responseResultPage = (HttpWebResponse)requestResultPage.GetResponse();
            Console.WriteLine("打开状态页面状态:{0},内容:{1}", responseLoginPage.StatusCode, new StreamReader(responseResultPage.GetResponseStream(), Encoding.UTF8).ReadToEnd());

            Console.Read();
        }
    }
}

服务器端也就是3个文件，一个是登陆页面，一个是登陆处理的servlet一个是验证登陆是否成功的jsp。分别如下：

1：登陆页面

<%@ page language="java"  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">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->
  </head>
  
  <body>
    <form action="<%=request.getContextPath()%>/servlet/LoginServlet" method="post">
    	<table>
    		<tr>
    			<td>用户名</td>
    			<td><input type="text" name="userName" /></td>
    		</tr>
    		<tr>
    			<td>密码</td>
    			<td><input type="text" name="password" /></td>
    		</tr>
    		<tr colspan="2">
    			<td><input type="submit" value="提交" /></td>
    		</tr>
    	</table>
    </form>
  </body>
</html>

2：处理登陆的servlet

package com.baseframework.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 LoginServlet extends HttpServlet {

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * 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 {

		doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @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 doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		response.setContentType("text/html");
		PrintWriter out = response.getWriter();
		String userName = request.getParameter("userName");
		String password = request.getParameter("password");
		if(userName != null && password != null && userName.equals("admin") && password.equals("123456")) {
			request.getSession().setAttribute("login", "true");
			// 添加一个session来验证cookie的效果
			request.getSession().setAttribute("count", "123456");
			out.println("登陆成功!");
			System.out.println("登陆成功!");
		} else {
			request.getSession().setAttribute("login", "false");
			out.println("登陆失败!");
			System.out.println("登陆失败!");
		}
		out.flush();
		out.close();
	}

}

3：判断登陆结果的页面

<%@ page language="java" 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 'result.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">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    <%
    	if(session.getAttribute("login") != null && session.getAttribute("login").equals("true")) {
    		out.println("登陆成功！");
    		// 打印测试session
    		out.println("[测试Session的count:" + session.getAttribute("count") + "]");
    		
    	} else {
    		out.println("失败！");
    	}	
    %>
  </body>
</html>

 

再次上个运行截图吧：