看之前先点赞! 1.JSP开发模型
为了方便使用JSP技术,SUN公司玮JSP技术提供了两种开发模型:JSP Mode1 和 JSP Mode2.
JSP Mode1:
JSP Mode2:
我们将按照Model2思想来完成用户注册功能;
1.创建项目,编写JavaBean(1)编写一个UserBean类,用于封装用户信息,代码如下:
package chapter14.jsp;
public class UserBean {
private String name;
private String password;
private String 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;
}
}
(2) 编写RegisterFormBean类,用于封装注册表单
package chapter14.jsp;
import java.util.HashMap;
import java.util.Map;
public class RegisterFormBean {
//1.用来封装注册参数的
private String name;
private String password;
private String password2;
private String 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 getPassword2() {
return password2;
}
public void setPassword2(String password2) {
this.password2 = password2;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
//------------进行服务端的数据-----------------------
//2.定义变量来接收用户校验的信息，比如说用户名、邮箱是否符合规范,
//第一个参数 属性名称 第二个参数：属性值是否符合规范信息,比如（“email”,”邮箱格式有误“）；
private Map errors = new HashMap();
public boolean validate(){
//2.定义变量，来判断数据是否满足规范，如果满足 就返回true,不满足就返回false
boolean flag = true;
if(name == null || name.trim().equals("")){
errors.put("name","请输入用户名");
flag = false;
return flag;
}
if(password == null || password.trim().equals("")){
errors.put("password","请输入密码");
flag = false;
return flag;
}else if(password.length()>12 || password.length()<6){
errors.put("password","请输入6-12个字符");
flag = false;
return flag;
}
if(password != null && !password.equals(password2)){
errors.put("password2","两次输入密码不一致");
flag = false;
return flag;
}
//校验邮箱,校验邮箱格式是否满足规范
String regex = "[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+";
if(email == null || email.trim().equals("")){
errors.put("email","请输入邮箱");
flag = false;
return flag;
}else if(!email.matches(regex)){
errors.put("email","邮箱格式错误");
flag = false;
return flag;
}
return flag;
}
//获取错误信息的方法
public Map getErrors() {
return errors;
}
//提供向map集合中添加错误信息
public void setErrorMsg(String err,String errMsg){
if((err != null) && (errMsg!=null)){
errors.put(err, errMsg);
}
}
}
2.创建工具类
(1) 编写DBUtil,实现两个功能,一个是定义了一个HashMap集合users,用于模拟数据库,并向数据库中存入了两条学生信息,第二个是定义getUser()方法和insertYser()方法操作数据库,如果存在就不能新建(返回FALSE),不存在则注册成功(返回TRUE)代码如下:
package chapter14.jsp;
import java.util.HashMap;
import chapter14.jsp.UserBean;
public class DBUtil {
private static DBUtil instance = new DBUtil();
public static DBUtil getInstance(){
return instance;
}
//定义集合，来保存用户注册的数据
private HashMap users = new HashMap();
//插入2条数据
public DBUtil(){
UserBean user1 = new UserBean();
user1.setName("Jack");
user1.setPassword("123456");
user1.setEmail("jack@it315.org");
users.put("Jack",user1);//链接数据库，放进去
UserBean user2 = new UserBean();
user2.setName("Rose");
user2.setPassword("abcdefr");
user2.setEmail("rose@it315.org");
users.put("Rose",user2);
}
//获取值的方法
public UserBean getUser(String username){
UserBean user = users.get(username);
return user;
}
//提供插入数据库的方法
public boolean insertUser(UserBean user){
//用户为null,不能插入
if(user == null){
return false;
}
//判断用户名是否重复
String username = user.getName();//用户提交过来的注册的参数
//String usernameDB = users.get(username).getName();//从数据库查询出来的用户名
UserBean userDB = users.get(username);
if(userDB !=null){//根据注册参数查询数据库有用户对象，表明用户名存在
return false;
}
users.put(username,user);
return true;
}
}
3.创建Servlet用来处理用户请求,新建一个ControllerServlet代码如下:
package chapter14.jsp;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/ControllerServlet")
public class ControllerServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
this.doGet(request, response);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setHeader("Content-type", "text/html;charset=UTF-8");
response.setCharacterEncoding("UTF-8");
String name = request.getParameter("name");
String password = request.getParameter("password");
String password2 = request.getParameter("password2");
String email = request.getParameter("email");
RegisterFormBean formBean = new RegisterFormBean();
formBean.setName(name);
formBean.setPassword(password);
formBean.setPassword2(password2);
formBean.setEmail(email);
//验证参数填写是否符合要求,如果不符合,转发到register.jsp重新填写
if(!formBean.validate()) {
request.setAttribute("formBean", formBean);
request.getRequestDispatcher("/register.jsp").forward(request, response);
return;
}
//参数填写符合要求,则将数据封装到UserBean类中
UserBean userBean = new UserBean();
userBean.setName(name);
userBean.setPassword(password);
userBean.setEmail(email);
//调用DBUtil的insertYser()方法执行添加操作,并返回一个boolean类型的标志
boolean b = DBUtil.getInstance().insertUser(userBean);
//如果返回false则表示注册的用户存在,重新填写
if(!b) {
request.setAttribute("DBMes", "你注册的用户已存在");
request.setAttribute("formBean", formBean);
request.getRequestDispatcher("/register.jsp").forward(request, response);
return;
}
response.getWriter().print("恭喜你注册成功,3秒钟自动跳转");
//将成功注册的用户信息添加到Session中
request.getSession().setAttribute("userBean", userBean);
//注册成功后,3秒跳转到登录成功页面loginSuccess.jsp
response.setHeader("refresh", "3;url=loginSuccess.jsp");
}
}
4. 创建JSP页面
(1) 编写register.jsp文件,代码如下:
<%@ page language="java" pageEncoding="GBK"%>
用户注册
h3 {
margin-left: 100px;
}
#outer {
width: 750px;
}
span {
color: #ff0000
}
div {
height:20px;
margin-bottom: 10px;
}
.ch {
width: 80px;
text-align: right;
float: left;
}
.ip {
width: 500px;
float: left
}
.ip>input {
margin-right: 20px
}
#bt {
margin-left: 50px;
}
#bt>input {
margin-right: 30px;
}
(2) 编写loginSuccess.jsp文件,是用来显示用户登录成功页面,代码如下:
<%@ page language="java" pageEncoding="GBK" import="chapter14.jsp.UserBean"%> <%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c"%>5. 运行程序,测试结果login successfully #main { width: 500px; height: auto; } #main div { width: 200px; height: auto; } ul { padding-top: 1px; padding-left: 1px; list-style: none; } 恭喜你，登录成功
您的信息
- 您的姓名: ${userBean.name }
- 您的邮箱:${userBean.email}
运行register.jsp:
输入姓名,密码,邮箱,点击注册就可以注册,如果输错了可以点击重置;
