JavaWeb_(request和response)用户登陆注册模板_基础版

时间 2020-07-14

标签 javaweb request response 用户登陆注册模板基础栏目 Java 繁體版

原文原文链接

　　用户登陆注册模板进阶版　　传送门html

用户登陆注册模板基础版java

　　登陆：当用户登陆成功时，跳转到personCenter.jsp，当用户登陆失败时，跳转到login.jsp并给出提示数据库

　　注册：当用户注册成功时，跳转到login.jsp，当用户注册失败时，跳转到register.jsp并给出提示jsp

　　personCenter.jsp展现用户信息ide

　　用户登陆注册模板基础版　　目录结构【用户登陆_02版】post

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>

<a href="login.jsp">登陆</a>
<a href="register.jsp">注册</a>

</body>
</html>

index.jsp

<%@ 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 msg = request.getAttribute("message"); if(msg!=null) out.println(msg); %> 登陆<hr>
<form action="login_do.jsp" methon="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>
</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("登陆失败，用户名或密码错误"); request.setAttribute("message","登陆失败，用户名或密码错误"); request.getRequestDispatcher("login.jsp").forward(request,response); }else{ // out.println("登陆成功"); //登陆请求的转发,将数据传递给personCenter.jsp页面 request.setAttribute("user", user); request.getRequestDispatcher("personCenter.jsp").forward(request,response); } %>
</body>
</html>

login_do.jsp

<%@ 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 msg = request.getAttribute("message"); if(msg!=null) out.println(msg); %>

<form action="register_do.jsp" methon="post"> 用户名：<input type="text" name="username" /><br/> 密码： <input type="password" name="password" /><br/> 年龄： <input type="text" name="age" /><br/> 性别：男<input type="radio" name="sex" value="男" />女<input type="radio" name="sex" value="女"/><br/>

<input type="submit" value="注册"/>
</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); //使用请求转发 if(isSuccess){ request.setAttribute("message", "注册成功，请登陆"); //经过getRequestDispatcher传递路径将请求转发给login.jsp request.getRequestDispatcher("login.jsp").forward(request,response); }else{ request.setAttribute("message", "注册失败，用户名重复"); //经过getRequestDispatcher传递路径将请求转发给login.jsp request.getRequestDispatcher("register.jsp").forward(request,response); } // if(isSuccess){ // out.println(username); // out.println("<font color='green'>注册成功</font>"); // }else{ // out.println(username); // out.println("<font color='red'>注册失败</font>"); // } %>
</body>
</html>

register_do.jsp

<%@ 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>
<% User user = (User)request.getAttribute("user"); %> 用户名：<%=user.getUsername()%><br/> 年龄：<%=user.getAge()%><br/> 性别：<%=user.getSex()%><br/>
</body>
</html>

personCenter.jsp

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; } }

User.java

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; } } //帐号校验
    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; } }

DBUtil.java

用户注册_01版this

　　当用户点击主页面注册时跳转到register.jsp页面，用户输入完表单后由register_do.jsp页面进行处理，户数据模型驱动User,java和DBUtild.java中对数据进行本地处理spa

　　DBUtild.java对用户ID进行同名检测，用户注册成功显示绿色提示信息，用户注册失败显示红色提示信息.net

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>

<a>登陆</a>
<a href="register.jsp">注册</a>

</body>
</html>

index.jsp

<%@ 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>

<form action="register_do.jsp" methon="post"> 用户名：<input type="text" name="username" /><br/> 密码： <input type="password" name="password" /><br/> 年龄： <input type="text" name="age" /><br/> 性别：男<input type="radio" name="sex" value="男" />女<input type="radio" name="sex" value="女"/><br/>

<input type="submit" value="注册"/>
</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); if(isSuccess){ out.println(username); out.println("<font color='green'>注册成功</font>"); }else{ out.println(username); out.println("<font color='red'>注册失败</font>"); } %>
</body>
</html>

register_do.jsp

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; } }

User.java

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; } } }

DBUtil.java

　　开发注册界面3d

　　表单

　　用户表单信息注册完毕后提交表单给register_do.jsp

<form action="register_do.jsp" methon="post"> 用户名：<input type="text" name="username" /><br/> 密码： <input type="password" name="password" /><br/> 年龄： <input type="text" name="age" /><br/> 性别：男<input type="radio" name="sex" value="男" />女<input type="radio" name="sex" value="女"/><br/>

<input type="submit" value="注册"/>
</form>

　　户数据模型驱动User,java存储用户信息，DBUtil.java运用字典集对数据进行本地存储

private static Map<String ,User>db = new HashMap<String,User>();

　　经过DBUtil.java中的addUser()方法对用户进行本地注册，返回bool值，当用户注册ID相同时返回false，不然返回true

if(db.containsKey(username)) { return false; }else { User user=new User(username,password,age,sex); db.put(username, user); return true; }

　　由register_do.java对用户信息进行校验

boolean isSuccess = DBUtil.addUser(username,password,age,sex); if(isSuccess){ out.println(username); out.println("<font color='green'>注册成功</font>"); }else{ out.println(username); out.println("<font color='red'>注册失败</font>"); }

用户注册_02版

　　当用户经过首页直接进入login.jsp时，login.jsp页面只显示登陆字样，用户经过register.jsp进入login.jsp页面时，跳转到login.jsp并提示用户注册成功

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>

<a href="login.jsp">登陆</a>
<a href="register.jsp">注册</a>

</body>
</html>

index.jsp

<%@ 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 msg = request.getAttribute("message"); if(msg!=null) out.println(msg); %> 登陆<hr>
<form action="" methon="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>
</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); //使用请求转发 if(isSuccess){ request.setAttribute("message", "注册成功，请登陆"); //经过getRequestDispatcher传递路径将请求转发给login.jsp request.getRequestDispatcher("login.jsp").forward(request,response); } // if(isSuccess){ // out.println(username); // out.println("<font color='green'>注册成功</font>"); // }else{ // out.println(username); // out.println("<font color='red'>注册失败</font>"); // } %>
</body>
</html>

register_do.jsp

<%@ 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>

<form action="register_do.jsp" methon="post"> 用户名：<input type="text" name="username" /><br/> 密码： <input type="password" name="password" /><br/> 年龄： <input type="text" name="age" /><br/> 性别：男<input type="radio" name="sex" value="男" />女<input type="radio" name="sex" value="女"/><br/>

<input type="submit" value="注册"/>
</form>

</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; } }

User.java

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; } } }

DBUtil.Java

　　当登陆成功时，经过在register_do.jsp页面中表单传递时进行转发给login,jsp页面【跳转到login.jsp页面】

boolean isSuccess = DBUtil.addUser(username,password,age,sex); //使用请求转发
if(isSuccess){ request.setAttribute("message", "注册成功，请登陆"); //经过getRequestDispatcher传递路径将请求转发给login.jsp
    request.getRequestDispatcher("login.jsp").forward(request,response); }

<%
Object msg = request.getAttribute("message"); if(msg!=null) out.println(msg); %>

用户登陆_01版

　　当用户登陆后，login.jsp表单中的信息与数据库中的帐号进行匹配，当用户的帐号存在时且密码输入正确，提示用户登陆成功，用户名不存在或用户名与帐号匹配错误时提示登陆失败

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>

<a href="login.jsp">登陆</a>
<a href="register.jsp">注册</a>

</body>
</html>

index.jsp

<%@ 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 msg = request.getAttribute("message"); if(msg!=null) out.println(msg); %> 登陆<hr>
<form action="login_do.jsp" methon="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>
</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("登陆失败，用户名或密码错误"); }else{ out.println("登陆成功"); } %>
</body>
</html>

login_do.html

<%@ 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>

<form action="register_do.jsp" methon="post"> 用户名：<input type="text" name="username" /><br/> 密码： <input type="password" name="password" /><br/> 年龄： <input type="text" name="age" /><br/> 性别：男<input type="radio" name="sex" value="男" />女<input type="radio" name="sex" value="女"/><br/>

<input type="submit" value="注册"/>
</form>

</body>
</html>

Vregister.jsp

<%@ 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); //使用请求转发 if(isSuccess){ request.setAttribute("message", "注册成功，请登陆"); //经过getRequestDispatcher传递路径将请求转发给login.jsp request.getRequestDispatcher("login.jsp").forward(request,response); } // if(isSuccess){ // out.println(username); // out.println("<font color='green'>注册成功</font>"); // }else{ // out.println(username); // out.println("<font color='red'>注册失败</font>"); // } %>
</body>
</html>

register_do.jsp

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; } }

User.java

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; } } //帐号校验
    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; } }

DBUtil.java

　　当用户提交登陆信息时，由login_do处理用户登陆的信息，

　　经过DBUtil.java中的verifyAccount()进行用户校验，当用户名存在并密码与用户相匹配时返回true

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; }

　　login_do.jsp中进行帐号校验

User user = DBUtil.verifyAccount(username,password); if(user==null){ out.println("登陆失败，用户名或密码错误"); }else{ out.println("登陆成功"); }

用户登陆_02版

　　登陆：当用户登陆成功时，跳转到personCenter.jsp，当用户登陆失败时，跳转到login.jsp并给出提示

　　注册：当用户注册成功时，跳转到login.jsp，当用户注册失败时，跳转到register.jsp并给出提示

　　personCenter.jsp展现用户信息

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Insert title here</title>
</head>
<body>

<a href="login.jsp">登陆</a>
<a href="register.jsp">注册</a>

</body>
</html>

index.jsp

<%@ 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 msg = request.getAttribute("message"); if(msg!=null) out.println(msg); %> 登陆<hr>
<form action="login_do.jsp" methon="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>
</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("登陆失败，用户名或密码错误"); request.setAttribute("message","登陆失败，用户名或密码错误"); request.getRequestDispatcher("login.jsp").forward(request,response); }else{ // out.println("登陆成功"); //登陆请求的转发,将数据传递给personCenter.jsp页面 request.setAttribute("user", user); request.getRequestDispatcher("personCenter.jsp").forward(request,response); } %>
</body>
</html>

login_do.jsp

<%@ 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 msg = request.getAttribute("message"); if(msg!=null) out.println(msg); %>

<form action="register_do.jsp" methon="post"> 用户名：<input type="text" name="username" /><br/> 密码： <input type="password" name="password" /><br/> 年龄： <input type="text" name="age" /><br/> 性别：男<input type="radio" name="sex" value="男" />女<input type="radio" name="sex" value="女"/><br/>

<input type="submit" value="注册"/>
</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); //使用请求转发 if(isSuccess){ request.setAttribute("message", "注册成功，请登陆"); //经过getRequestDispatcher传递路径将请求转发给login.jsp request.getRequestDispatcher("login.jsp").forward(request,response); }else{ request.setAttribute("message", "注册失败，用户名重复"); //经过getRequestDispatcher传递路径将请求转发给login.jsp request.getRequestDispatcher("register.jsp").forward(request,response); } // if(isSuccess){ // out.println(username); // out.println("<font color='green'>注册成功</font>"); // }else{ // out.println(username); // out.println("<font color='red'>注册失败</font>"); // } %>
</body>
</html>

register_do.jsp

<%@ 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>
<% User user = (User)request.getAttribute("user"); %> 用户名：<%=user.getUsername()%><br/> 年龄：<%=user.getAge()%><br/> 性别：<%=user.getSex()%><br/>
</body>
</html>

personCenter.jsp

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; } }

User.java

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; } }

DBUtil.java

　　personCenter.jsp经过request内置对象获得用户信息后输出其信息

<% User user = (User)request.getAttribute("user"); %> 用户名：<%=user.getUsername()%><br/> 年龄：<%=user.getAge()%><br/> 性别：<%=user.getSex()%><br/>

　　login_do.jsp处理用户登陆成功时和登陆失败时事件

<%
String username = request.getParameter("username"); String password = request.getParameter("password"); User user = DBUtil.verifyAccount(username,password); if(user==null){ // out.println("登陆失败，用户名或密码错误"); request.setAttribute("message","登陆失败，用户名或密码错误"); request.getRequestDispatcher("login.jsp").forward(request,response); }else{ // out.println("登陆成功"); //登陆请求的转发,将数据传递给personCenter.jsp页面 request.setAttribute("user", user); request.getRequestDispatcher("personCenter.jsp").forward(request,response); } %>

　　register_do.jsp处理用户注册成功时和注册失败时事件

<%

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); //使用请求转发 if(isSuccess){ request.setAttribute("message", "注册成功，请登陆"); //经过getRequestDispatcher传递路径将请求转发给login.jsp request.getRequestDispatcher("login.jsp").forward(request,response); }else{ request.setAttribute("message", "注册失败，用户名重复"); //经过getRequestDispatcher传递路径将请求转发给login.jsp request.getRequestDispatcher("register.jsp").forward(request,response); } // if(isSuccess){ // out.println(username); // out.println("<font color='green'>注册成功</font>"); // }else{ // out.println(username); // out.println("<font color='red'>注册失败</font>"); // } %>