利用session完成登录

来源：互联网发布：加强网络管理的通知编辑：程序博客网时间：2024/06/05 05:41

package cn.itcast.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 LoginServlet extends HttpServlet {

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

response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();

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

List<User> list = DB.getAll();
for(User user : list){
if(user.getUsername().equals(username) && user.getPassword().equals(password)){
request.getSession().setAttribute("user", user);//登录成功，向session中存登录标记
response.sendRedirect("/day07/index.jsp");
return;
}
}
out.write("用户名或密码不对");
}

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

doGet(request, response);
}

}

class DB{
public static List list = new ArrayList();
static {
list.add(new User("aa","123"));
list.add(new User("bb","123"));
list.add(new User("cc","123"));
}
public static List getAll(){
return list;
}

}

package cn.itcast.login;

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;
import javax.servlet.http.HttpSession;

public class logoutServlet extends HttpServlet {

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

HttpSession session = request.getSession(false);
if(session==null){
response.sendRedirect("/day07/index.jsp");
return;
}
session.removeAttribute("user");
response.sendRedirect("/day07/index.jsp");
}

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

doGet(request, response);
}

}

index.jsp

<body>

欢迎您:${user.username}
<a href="/day07/servlet/LoginServlet">登录</a>
<a href="/day07/servlet/logoutServlet">注销</a>
<br/><br/><br/>
<a href="/day07/SessionDemo1">购买</a>
<a href="/day07/SessionDemo2">结账</a>

</body>

user.java

package cn.itcast.login;

public class User {

private String username;
private String password;
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;
}
}

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