用戶登錄注冊模板_基礎版 傳送門
用戶登錄注冊模板進階版
添加了獲得獲得當前登錄用戶信息及存儲登錄人數
用戶登錄后，在首頁、注冊頁、登錄頁顯示登錄用戶信息和存儲登錄人數信息
目錄結構
<%@page import="com.Gary.model.User"%> <%@ page language="java" import="java.util.*" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Insert title here</title> </head> <body> <% Object o = session.getAttribute("user"); if(o!=null){ User user = (User)o; out.println("當前登錄用戶："+user.getUsername()+"<br/>"); } %> <% Object o2 = application.getAttribute("userNumber"); if(o2!=null){ out.println("當前登錄用戶"+o2+"個<br/>"); } %> <a href="login.jsp">登錄</a> <a href="register.jsp">注冊</a> </body> </html>
<%@page import="com.Gary.model.User"%> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Insert title here</title> </head> <body> <% Object o = session.getAttribute("user"); if(o!=null){ User user = (User)o; out.println("當前登錄用戶："+user.getUsername()+"<br/>"); } %> <% Object msg = request.getAttribute("message"); if(msg!=null) out.println(msg); %> 登錄<hr> <form action="login_do.jsp" methon="post"> 用戶名：<input type="text" name="username" /><br/> 密碼 ：<input type="password" name="password" /><br/> <input type="submit" value="登錄"/> </form> </body> </html>
<%@page import="com.Gary.util.DBUtil" %> <%@page import="com.Gary.model.User" %> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Insert title here</title> </head> <body> <% String username = request.getParameter("username"); String password = request.getParameter("password"); User user = DBUtil.verifyAccount(username,password); if(user==null){ // out.println("登錄失敗，用戶名或密碼錯誤"); request.setAttribute("message","登錄失敗，用戶名或密碼錯誤"); request.getRequestDispatcher("login.jsp").forward(request,response); }else{ // out.println("登錄成功"); int number = 0; //第一次登錄用戶時if不瞞住,number=0 if(application.getAttribute("userNumber")!=null){ number = (Integer)application.getAttribute("userNumber"); } //登錄過一個用戶后在原基礎number上進行++ number++; application.setAttribute("userNumber",number); //通過seesion的setAttribute傳遞數據 session.setAttribute("user", user); //登錄請求的轉發,將數據傳遞給personCenter.jsp頁面 request.getRequestDispatcher("personCenter.jsp").forward(request,response); } %> </body> </html>
<%@page import="com.Gary.model.User"%> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Insert title here</title> </head> <body> <% Object o = session.getAttribute("user"); if(o!=null){ User user = (User)o; out.println("當前登錄用戶："+user.getUsername()+"<br/>"); } %> <% Object msg = request.getAttribute("message"); if(msg!=null) out.println(msg); %> <form action="register_do.jsp" methon="post"> 用戶名：<input type="text" name="username" /><br/> 密碼： <input type="password" name="password" /><br/> 年齡： <input type="text" name="age" /><br/> 性別：男<input type="radio" name="sex" value="男" />女<input type="radio" name="sex" value="女"/><br/> <input type="submit" value="注冊"/> </form> </body> </html>
<%@ page import="com.Gary.util.DBUtil" %> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Insert title here</title> </head> <body> <% String username = request.getParameter("username"); String password = request.getParameter("password"); int age = Integer.parseInt(request.getParameter("age")); String sex = request.getParameter("sex"); boolean isSuccess = DBUtil.addUser(username,password,age,sex); //使用請求轉發 if(isSuccess){ request.setAttribute("message", "注冊成功，請登錄"); //通過getRequestDispatcher傳遞路徑將請求轉發給login.jsp request.getRequestDispatcher("login.jsp").forward(request,response); }else{ request.setAttribute("message", "注冊失敗，用戶名重復"); //通過getRequestDispatcher傳遞路徑將請求轉發給login.jsp request.getRequestDispatcher("register.jsp").forward(request,response); } // if(isSuccess){ // out.println(username); // out.println("<font color='green'>注冊成功</font>"); // }else{ // out.println(username); // out.println("<font color='red'>注冊失敗</font>"); // } %> </body> </html>
<%@ page import="com.Gary.model.User" %> <%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>Insert title here</title> </head> <body> <% //通過session的getAttribute進行訪問 User user = (User)session.getAttribute("user"); %> 用戶名：<%=user.getUsername()%><br/> 年齡：<%=user.getAge()%><br/> 性別：<%=user.getSex()%><br/> </body> </html>
package com.Gary.model; public class User { private String username; private String password; private int age; private String sex; public User(String username, String password, int age, String sex) { super(); this.username = username; this.password = password; this.age = age; this.sex = sex; } 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; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } }
package com.Gary.util; import java.util.HashMap; import java.util.Map; import com.Gary.model.User; public class DBUtil { private static Map<String ,User>db = new HashMap<String,User>(); public static boolean addUser(String username,String password,int age,String sex) { //TODO if(db.containsKey(username)) { return false; }else { User user=new User(username,password,age,sex); db.put(username, user); return true; } } //賬號校驗 public static User verifyAccount(String username,String password) { if(db.containsKey(username)) { User user = db.get(username); if(user.getPassword().equals(password)) { return user; }else { return null; } } return null; } }
獲得當前用戶登錄
注冊時通過session的setAttribute傳遞數據
<% String username = request.getParameter("username"); String password = request.getParameter("password"); User user = DBUtil.verifyAccount(username,password); if(user==null){ // out.println("登錄失敗，用戶名或密碼錯誤"); request.setAttribute("message","登錄失敗，用戶名或密碼錯誤"); request.getRequestDispatcher("login.jsp").forward(request,response); }else{ // out.println("登錄成功"); //通過seesion的setAttribute傳遞數據 session.setAttribute("user", user); //登錄請求的轉發,將數據傳遞給personCenter.jsp頁面 request.getRequestDispatcher("personCenter.jsp").forward(request,response); } %>
personCenter中通過Session對存儲user鍵值進行訪問
<% //通過session的getAttribute進行訪問 User user = (User)session.getAttribute("user"); %>
index.jsp、login.jsp、register.jsp中添加session會話獲得當前登錄用戶
<% Object o = session.getAttribute("user"); if(o!=null){ User user = (User)o; out.println("當前登錄用戶："+user.getUsername()+"<br/>"); } %>
存儲登錄人數
當用戶web啟動的時候會創建application內置對象，當用戶關閉web時銷毀application內置對象
application存放的數據通常是所有客戶端所共享的數據
當用戶注冊時，login_do.jsp中定義一個number變量用來存儲登錄人數，每次有用戶進行登錄時，使number數量+1
<% String username = request.getParameter("username"); String password = request.getParameter("password"); User user = DBUtil.verifyAccount(username,password); if(user==null){ // out.println("登錄失敗，用戶名或密碼錯誤"); request.setAttribute("message","登錄失敗，用戶名或密碼錯誤"); request.getRequestDispatcher("login.jsp").forward(request,response); }else{ // out.println("登錄成功"); int number = 0; //第一次登錄用戶時if不瞞住,number=0 if(application.getAttribute("userNumber")!=null){ number = (Integer)application.getAttribute("userNumber"); } //登錄過一個用戶后在原基礎number上進行++ number++; application.setAttribute("userNumber",number); //通過seesion的setAttribute傳遞數據 session.setAttribute("user", user); //登錄請求的轉發,將數據傳遞給personCenter.jsp頁面 request.getRequestDispatcher("personCenter.jsp").forward(request,response); } %>
在index.jsp中添加application應用
<% Object o2 = application.getAttribute("userNumber"); if(o2!=null){ out.println("當前登錄用戶"+o2+"個<br/>"); } %>