一 實現的思路：
1．Register.jsp
負責向用戶顯示註冊的頁面，用戶名、密碼、確認密碼、email
2．ControllerServlet.java
用來接收客戶端提交的請求，然後進行驗證：語法格式的驗證和該用戶是否是已經存在的用戶，如果該用戶是合法的，將該用戶加入到users表中，然後跳轉到loginSuccess.jsp頁面上，顯示用戶信息。否則跳轉到register.jsp，將錯誤信息顯示出來
3．RegisterFormBean.java：用來封裝用戶輸入的表單的數據，並可以做基本語法格式的驗證
4．UserBean.java：保存用戶的信息，包括用戶名、密碼以及確認密碼
5．DbUtil.java： 集合對象 user,<”zhangsan”,user>
添加用戶的方法 insertUser(User user)
6．自定義異常類---提示用戶註冊錯誤，寫一個異常類DbUtilException
二 實現的代碼：
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 4.01Transitional//EN">
<html>
<head>
<base href="<%=basePath%>">
<title>My JSP'register.jsp' starting page</title>
<meta http-equiv="pragma" content="no-cache">
<meta http-equiv="cache-control" content="no-cache">
<meta http-equiv="expires" content="0">
<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
<meta http-equiv="description" content="This is my page">
<!--
<link rel="stylesheet"type="text/css" href="styles.css">
-->
</head>
<body>
<jsp:useBean id="registerForm" class="com.csdn.beans.RegisterFormBean"
scope="request" />
<jsp:setProperty property="*" name="registerForm" />
<form action="registerServlet" method="post">
<table>
<tbody>
<tr>
<td>
用戶名:
</td>
<td>
<input type="text" name="name" value="<%=registerForm.getName() %>"/>
</td>
<td>
<%=registerForm.getErrorMsg("name") %>
</td>
</tr>
<tr>
<td>
密 碼:
</td>
<td>
<input type="password" name="password1" value="<%=registerForm.getPassword1()%>"/>
</td>
<td>
<%=registerForm.getErrorMsg("password1") %>
</td>
</tr>
<tr>
<td>
確認密碼：
</td>
<td>
<input type="password" name="password2" value="<%=registerForm.getPassword2()%>"/>
</td>
<td>
<%=registerForm.getErrorMsg("password2") %>
</td>
</tr>
<tr>
<td>
email：
</td>
<td>
<input type="text" name="email" value="<%=registerForm.getEmail()%>"/>
</td>
<td>
<%=registerForm.getErrorMsg("email") %>
</td>
</tr>
<tr>
<td>
<input type="submit" name="submit" value="註冊" />
</td>
<td>
</td>
<td>
</td>
</tr>
</tbody>
</table>
</form>
</body>
</html>
2．ControllerServlet.java
public void doPost(HttpServletRequest request,HttpServletResponse response)
throws ServletException, IOException {
RequestDispatcher rd = null;
//控制器
//獲取表單提交的數據封裝在registerFormBean對象中，進行語法格式的驗證
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"));
//驗證
if(!registerForm.validte()){
//轉向到register.jsp
rd =request.getRequestDispatcher("/register.jsp");
rd.forward(request, response);
return;
}
//將registerFormBean對象中的數據存儲到UserBean對象中，然後調用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) {
// 處理該異常
registerForm.setErrorMsg("name", ex.getErrorMsg("name"));
//轉到register.jsp頁面中
rd =request.getRequestDispatcher("/register.jsp");
rd.forward(request, response);
return;
}
//得到session對象
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-generated constructor stub
}
public RegisterFormBean(String name, Stringpassword1, String password2,
Stringemail) {
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 +"]";
}
// 基本格式的驗證
private Hashtable errors = new Hashtable();
@SuppressWarnings("unchecked")
public boolean validte() {
boolean okAll = true;
// 語法格式的驗證
if (name.trim().equals("")) {
errors.put(name, "請重新輸入");
okAll= false;
}
if (password1.length() > 10 ||password1.length() < 6) {
errors.put("password1", "密碼必須包含6-10個字符");
okAll= false;
}
if (!password2.equals("password1")){
errors.put("password2", "密碼不一致");
okAll= false;
}
if (!email.matches("[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\\.[a-zA-Z0-9_-]+)+")){
errors.put("email", "郵箱格式不正確");
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-generated constructor 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 + "]";
}
//驗證方法
public boolean validatePassword(String password){
if(this.password.equals(password)){
returntrue;
}else{
returnfalse;
}
}
}
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;
//單利類的實現
public class DbUtil{
private Hashtable users = new Hashtable();
static DbUtil instance = new DbUtil();
private DbUtil(){
UserBean user1 = new UserBean();
user1.setName("張三");
user1.setPassword("1234567");
user1.setEmail("[email protected]");
UserBean user2 = new UserBean();
user2.setName("李四");
user2.setPassword("1234567");
user2.setEmail("[email protected]");
UserBean user3 = new UserBean();
user3.setName("王五");
user3.setPassword("1234567");
user3.setEmail("[email protected]");
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;
}
StringuserName=user.getName();
if(users.get(userName)!=null){
//說明該用戶名已經存在
DbUtilException ex = new DbUtilException();
ex.setErrorMsg("name","該用戶已經存在");
throw ex;
}
//說明該用戶不存在,添加
users.put(userName, user);
}
}
6．自定義異常類
package com.csdn.exception;
import java.util.Hashtable;
//異常處理類
public class DbUtilException extends Exception{
// 存儲錯誤消息
private Hashtable errors = new Hashtable();
public void setErrorMsg(String err, String msg) {
if (err != null && msg != null){
errors.put(err, msg);
}
}
public String getErrorMsg(String err) {
Object message = (String)errors.get(err);
return (String) ((message == null)? "" : message);
}
}