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.
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<String,String> errors = new HashMap<String,String>();
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<String, String> 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;
/*
* 模拟数据库
*/
/*
* 模拟数据库
*/
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<String, UserBean> users = new HashMap<String, UserBean>();
//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;
/**
* Servlet implementation class ControllerServlet
*/
@WebServlet("/ControllerServlet")
public class ControllerServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* @see HttpServlet#HttpServlet()
*/
/**
* @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
this.doGet(request, response);
}
/**
* @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse 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"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01
Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>用户注册</title>
<style type="text/css">
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;
}
</style>
</head>
<body>
<form action="ControllerServlet" method="post">
<h3>用户注册</h3>
<div id="outer">
<div>
<div class="ch">姓名:</div>
<div class="ip">
<input type="text" name="name" value="${formBean.name }" />
<span>${formBean.errors.name}${DBMes}</span>
</div>
</div>
<div>
<div class="ch">密码:</div>
<div class="ip">
<input type="password" name="password" />
<span>${formBean.errors.password}</span>
</div>
</div>
<div>
<div class="ch">确认密码:</div>
<div class="ip">
<input type="password" name="password2" />
<span>${formBean.errors.password2}</span>
</div>
</div>
<div>
<div class="ch">邮箱:</div>
<div class="ip">
<input type="text" name="email" value="${formBean.email }" />
<span>${formBean.errors.email}</span>
</div>
</div>
<div id="bt">
<input type="reset" value="重置 " />
<input type="submit" value="注册" />
</div>
</div>
</form>
</body>
</html>
(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"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01
Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<title>login successfully</title>
<style type="text/css">
#main {
width: 500px;
height: auto;
}
#main div {
width: 200px;
height: auto;
}
ul {
padding-top: 1px;
padding-left: 1px;
list-style: none;
}
</style>
</head>
<body>
<div id="main">
<div id="welcome">恭喜你，登录成功</div>
<hr />
<div>您的信息</div>
<div>
<ul>
<li>您的姓名: ${userBean.name }</li>
<li>您的邮箱:${userBean.email}</li>
</ul>
</div>
</div>
</body>
</html>
5. 运行程序,测试结果
运行register.jsp:
输入姓名,密码,邮箱,点击注册就可以注册,