Session小案例------完成用户登录

在项目开发中，用户登陆功能再平常只是啦，当用户完毕username和password校验后。进入主界面，须要在主界面中显示用户的信息，此时用session来记住用户是最为合适只是了。

功能实现例如以下：

1，完毕用户登陆功能

2，在主界面记住用户

3，完毕用户注销功能

用户类：

package cn.itcast.login;

public class User{

	private String username;

	private String password;

	public User() {

		super();

		// TODO Auto-generated constructor stub

	}

	public User(String username, String password) {

		super();

		this.username = username;

		this.password = password;

	}

	public String getUsername() {

		return username;

	}

	public void setUsername(String username) {

		this.username = username;

	}

	public String getPassword() {

		return password;

	}

	public void setPassword(String password) {

		this.password = password;

	}

}

登陆：

package cn.itcast.login;

import java.io.IOException;

import java.util.ArrayList;

import java.util.List;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

//处理登陆请求

public class LoginServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		//request.getAttribute("username");  //从域中取username

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

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

		//检測username与password在数据库中是否存在

		List<User> list = DB.getAll();

		for(User user : list){

			if(user.getUsername().equals(username)  && user.getPassword().equals(password)){

				//从数据库中找到匹配用户。让用户登陆成功

				request.getSession().setAttribute("user", user);

				response.sendRedirect("/day07/index.jsp");

				return;

			}

		}

		response.setCharacterEncoding("UTF-8");

		response.setContentType("text/html;charset=UTF-8");

		response.getWriter().write("用户名或密码错误。！");

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		doGet(request, response);

	}

}

class DB{

	private static List<User> list = new ArrayList();

	static{

		list.add(new User("aaa","123"));

		list.add(new User("bbb","123"));

		list.add(new User("ccc","123"));

		list.add(new User("ddd","123"));

	}

	public static List getAll(){

		return list;

	}

}

注销：

package cn.itcast.login;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

import javax.servlet.http.HttpSession;

//注销登陆用户

public class LogoutServlet extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		HttpSession session = request.getSession(false);

		if(session!=null){

			session.removeAttribute("user");

		}

		response.sendRedirect("/day07/index.jsp");

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)

			throws ServletException, IOException {

		doGet(request, response);

	}

}

登陆页面：

	<form action="/day07/servlet/LoginServlet" method="post">

  		用户名：<input type="text" name="username"><br/>

  		密码：<input type="password" name="password"><br/>

  		<input type="submit" value="登陆">

  	</form>

主页面：

 <body>

    欢迎您：

    <%

    	User user = (User)session.getAttribute("user");

    	if(user!=null)

    		out.write(user.getUsername());

    %>

    <a href="/day07/servlet/LogoutServlet">注销</a>

  </body>

秒客网

Session小案例------完成用户登录

Session小案例------完成用户登录

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