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Java Web Session 登录实例

2016-03-17 10:58 387 查看

package cn.com.login;

import java.io.IOException;

import java.io.PrintWriter;

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;

public class Login extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

response.setCharacterEncoding("UTF-8");

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

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

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

PrintWriter out=response.getWriter();

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

for(User user:list)

{

if(user.getUserName().equals(userName)&&user.getPassword().equals(password))

{

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

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

return ;

}

}

out.write("用户名或者密码错误！");

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request,response);

}

}

class Db

{

public 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"));

}

public static List<User> getAll()

{

return list;

}

}

package cn.com.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;

}

}

package cn.com.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;

/**

* Servlet implementation class LogOut

*/

public class LogOut extends HttpServlet {

private static final long serialVersionUID = 1L;

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

HttpSession session=request.getSession(false);

if(session==null)

{

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

return ;

}

session.removeAttribute("user");

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

}

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {

doGet(request,response);

}

}

<!DOCTYPE html>

<html>

<head>

<title>Index.html</title>

<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">

<meta http-equiv="description" content="this is my page">

<meta http-equiv="content-type" content="text/html; charset=UTF-8">



</head>

<body>

<form action="/Session/Login">

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

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

<input type="submit" value="登录" name="login"/>

</form>

</body>

</html>

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