JSP模式2 实现用户注册的功能

来源：互联网发布：石油骚动mac版中文编辑：程序博客网时间：2024/06/01 11:54

一实现的思路：

1．Register.jsp

负责向用户显示注册的页面，用户名、密码、确认密码、email

2．ControllerServlet.java

用来接收客户端提交的请求，然后进行验证：语法格式的验证和该用户是否是已经存在的用户，如果该用户是合法的，将该用户加入到users表中，然后跳转到loginSuccess.jsp页面上，显示用户信息。否则跳转到register.jsp，将错误信息显示出来

3．RegisterFormBean.java：用来封装用户输入的表单的数据，并可以做基本语法格式的验证

4．UserBean.java ：保存用户的信息，包括用户名、密码以及确认密码

5．DbUtil.java：集合对象 user,<”zhangsan”,user>

添加用户的方法 insertUser(User user)

6．自定义异常类---提示用户注册错误，写一个异常类 DbUtilException

二实现的代码：

1．register.jsp

<%@ page language="java"import="java.util.*" pageEncoding="utf-8"%>

String path = request.getContextPath();

String basePath = request.getScheme() + "://"

+ request.getServerName() + ":" + request.getServerPort()

+ path + "/";

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>

<head>

<title>My JSP'register.jsp' starting page</title>

<!--

-->

</head>

<body>

<jsp:useBean id="registerForm"class="com.csdn.beans.RegisterFormBean"

scope="request" />

<jsp:setProperty property="*"name="registerForm" />

<table>

<tbody>

<tr>

<td>

用户名:

</td>

<td>

</td>

<td>

<%=registerForm.getErrorMsg("name") %>

</td>

</tr>

<tr>

<td>

密  码:

</td>

<td>

</td>

<td>

<%=registerForm.getErrorMsg("password1") %>

</td>

</tr>

<tr>

<td>

确认密码：

</td>

<td>

</td>

<td>

<%=registerForm.getErrorMsg("password2") %>

</td>

</tr>

<tr>

<td>

email：

</td>

<td>

</td>

<td>

<%=registerForm.getErrorMsg("email") %>

</td>

</tr>

<tr>

<td>

</td>

<td>

</td>

<td>

</td>

</tr>

</tbody>

</table>

</form>

</body>

</html>

2．ControllerServlet.java

public void doPost(HttpServletRequest request, HttpServletResponseresponse)

throws ServletException, IOException {

RequestDispatcher rd = null;

//控制器

//获取表单提交的数据封装在registerFormBean对象中，进行语法格式的验证

RegisterFormBean registerForm = new RegisterFormBean();

request.setAttribute("registerForm", registerForm);

registerForm.setName(request.getParameter("name"));

registerForm.setPassword1(request.getParameter("password1"));

registerForm.setPassword2(request.getParameter("password2"));

registerForm.setEmail(request.getParameter("email"));

//验证

if(!registerForm.validte()){

//转向到register.jsp

rd = request.getRequestDispatcher("/register.jsp");

rd.forward(request, response);

return;

}

//将registerFormBean对象中的数据存储到UserBean对象中，然后调用DbUtil中的insertUtil

UserBean user = new UserBean();

user.setName(registerForm.getName());

user.setPassword(registerForm.getPassword1());

user.setPassword(registerForm.getPassword2());

user.setEmail(registerForm.getEmail());

DbUtil db = DbUtil.getInstance();

try {

db.insertUser(user);

} catch (DbUtilException ex) {

// 处理该异常

registerForm.setErrorMsg("name", ex.getErrorMsg("name"));

//转到register.jsp页面中

rd = request.getRequestDispatcher("/register.jsp");

rd.forward(request, response);

return;

}

//得到session对象

HttpSession session= request.getSession();

session.setAttribute("user", user);

rd = request.getRequestDispatcher("/loginSuccess");

rd.forward(request, response);

}

3．RegisterFormBean.java

package com.csdn.beans;

import java.util.Hashtable;

public class RegisterFormBean {

private String name = "";

private String password1 = "";

private String password2 = "";

private String email = "";

public RegisterFormBean() {

super();

// TODO Auto-generatedconstructor stub

}

public RegisterFormBean(String name, String password1, Stringpassword2,

String email) {

super();

this.name = name;

this.password1 = password1;

this.password2 = password2;

this.email = email;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getPassword1() {

return password1;

}

public void setPassword1(String password1) {

this.password1 = password1;

}

public String getPassword2() {

return password2;

}

public void setPassword2(String password2) {

this.password2 = password2;

}

public String getEmail() {

return email;

}

public void setEmail(String email) {

this.email = email;

}

@Override

public String toString() {

return "RegisterFormBean[email=" + email + ",name=" + name

+ ",password1=" + password1 + ",password2=" + password2 + "]";

}

// 基本格式的验证

private Hashtable errors = newHashtable();

@SuppressWarnings("unchecked")

public boolean validte() {

boolean okAll = true;

// 语法格式的验证

if (name.trim().equals("")) {

errors.put(name, "请重新输入");

okAll = false;

}

if (password1.length() > 10 || password1.length() < 6) {

errors.put("password1", "密码必须包含6-10个字符");

okAll = false;

}

if (!password2.equals("password1")) {

errors.put("password2", "密码不一致");

okAll = false;

}

if (!email.matches("[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\\.[a-zA-Z0-9_-]+)+")) {

errors.put("email", "邮箱格式不正确");

okAll = false;

}

return okAll;

}

public void setErrorMsg(String err, String errMsg) {

if (err != null && errMsg !=null) {

errors.put(err, errMsg);

}

public String getErrorMsg(String err) {

Object message =(String) errors.get(err);

return (String) ((message == null) ? "" : message);

}

4. UserBean.java

package com.csdn.beans;

public class UserBean {

private String name;

private String password;

private String email;

public UserBean() {

super();

// TODO Auto-generatedconstructor stub

}

public UserBean(String name, String password, String email) {

super();

this.name = name;

this.password = password;

this.email = email;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

public String getPassword() {

return password;

}

public void setPassword(String password) {

this.password = password;

}

public String getEmail() {

return email;

}

public void setEmail(String email) {

this.email = email;

}

@Override

public String toString() {

return "UserBean[email=" + email + ",name=" + name + ",password="

+ password + "]";

}

//验证方法

public boolean validatePassword(String password){

if(this.password.equals(password)){

return true;

}else{

return false;

}

5. DbUtil.java

package com.csdn.util;

import java.util.Hashtable;

import sun.security.jca.GetInstance;

import com.csdn.beans.UserBean;

import com.csdn.exception.DbUtilException;

//单利类的实现

public class DbUtil {

private Hashtable users = newHashtable();

static DbUtil instance = new DbUtil();

private DbUtil(){

UserBean user1 = new UserBean();

user1.setName("张三");

user1.setPassword("1234567");

user1.setEmail("zhangsan@163.com");

UserBean user2 = new UserBean();

user2.setName("李四");

user2.setPassword("1234567");

user2.setEmail("zhangsan@163.com");

UserBean user3 = new UserBean();

user3.setName("王五");

user3.setPassword("1234567");

user3.setEmail("zhangsan@163.com");

users.put(user1.getName(), user1);

users.put(user2.getName(), user2);

users.put(user3.getName(), user3);

}

public static DbUtil getInstance(){

return instance;

}

public UserBean getUser(String name){

UserBean user =(UserBean) users.get(name);

return user;

}

public void insertUser(UserBean user) throws DbUtilException{

if(user==null){

return;

}

String userName=user.getName();

if(users.get(userName)!=null){

//说明该用户名已经存在

DbUtilException ex = new DbUtilException();

ex.setErrorMsg("name","该用户已经存在");

throw ex;

}

//说明该用户不存在,添加

users.put(userName, user);

}

6．自定义异常类

package com.csdn.exception;

import java.util.Hashtable;

//异常处理类

public class DbUtilException extends Exception {

// 存储错误消息

private Hashtable errors = newHashtable();

public void setErrorMsg(String err, String msg) {

if (err != null && msg !=null) {

errors.put(err, msg);

}

public StringgetErrorMsg(String err) {

Object message = (String) errors.get(err);

return (String) ((message == null) ? "" : message);

}