【SSH网上商城】——AJAX异步验证是否存在该用户名
这几天抽着中午的空隙，敲SSH网上商城，刚开始敲的时候，弄SSH的框架花了段时间，框架搭完以后，开始首页跳转，一切都开始步入正轨了。敲了几集视频，感觉SSH网上商城的项目挺好玩的，虽然开始学习的时候不太懂，但是看着功能一个一个的实现，很有成就感。
使用ajax完成用户名是否存在的异步校验：一共分为五个步骤：
1.事件触发:
* 在用户名那添加onblur事件
2.编写AJAX代码:
* 向Action中提交:传递username参数
3.编写Action
* 接收username:模型驱动接收.
* 编写实体类
* User
* User.hbm.xml
* 配置到Spring中.
4.编写DAO
* 继承HibernateDaoSupport
* 在配置中注入sessionFactory
5.编写Service
*注入UserDao
*事务管理
1、在注册页面找到用户名，为用户名添加onblur（鼠标失去焦点）事件
<strong><span style="font-size:18px;"><input type="text" id="username" name="username" class="text" maxlength="20" onblur="checkUsername()"/></span></strong>2、编写AJAX代码:
<strong><span style="font-size:18px;"> function checkUsername(){
// 获得文件框值:
var username = document.getElementById("username").value;
// 1.创建异步交互对象
var xhr = createXmlHttp();
// 2.设置监听
xhr.onreadystatechange = function(){
if(xhr.readyState == 4){
if(xhr.status == 200){
document.getElementById("span1").innerHTML = xhr.responseText;
}
}
}
// 3.打开连接
xhr.open("GET","${pageContext.request.contextPath}/user_findByName.action?time="+new Date().getTime()+"&username="+username,true);
// 4.发送
xhr.send(null);
}
function createXmlHttp(){
var xmlHttp;
try{ // Firefox, Opera 8.0+, Safari
xmlHttp=new XMLHttpRequest();
}
catch (e){
try{// Internet Explorer
xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
}
catch (e){
try{
xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
}
catch (e){}
}
}
return xmlHttp;
}</span></strong>3.编写Action
在编写action前，需要先创建相应的包和类，要用到的user的包和类，见下图：
userAction:接收username:模型驱动接收
package cn.itcast.shop.user;
import java.io.IOException;
import cn.itcast.shop.user.service.UserService;
import cn.itcast.shop.user.vo.User;
import javax.servlet.http.HttpServletResponse;
import org.apache.struts2.ServletActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
/**
* 用户模块Action的类
* @author CXC
*
*/
public class UserAction extends ActionSupport implements ModelDriven<User> {
//模型驱动要使用的
private User user=new User();
public User getModel(){
return user;
}
//接受验证码：
private String checkcode;
public void setCheckcode(String checkcode){
this.checkcode=checkcode;
}
//注入UserService
private UserService userService;
public void setUserService(UserService userService) {
this.userService = userService;
}
/**
* 跳转到注册页面的执行方法
*/
public String registPage() {
return "registPage";
}
/**
* AJAX进行一步校验用户名的执行方法
* @ throws IOException
*/
public String findByName() throws IOException {
// 调用Service进行查询:
User existUser = userService.findByUsername(user.getUsername());
// 获得response对象,向页面输出:
HttpServletResponse response = ServletActionContext.getResponse();
response.setContentType("text/html;charset=UTF-8");
// 判断
if (existUser != null) {
// 查询到该用户:用户名已经存在
response.getWriter().println("<font color='red'>用户名已经存在</font>");
} else {
// 没查询到该用户:用户名可以使用
response.getWriter().println("<font color='green'>用户名可以使用</font>");
}
return NONE;
}
/**
* 用户注册的方法：
*/
public String regist(){
//判断验证码程序
//从session中获得验证码的随机值
String checkcode1=(String)ServletActionContext.getRequest().getSession().getAttribute("checkcode");
if(!checkcode.equalsIgnoreCase(checkcode1)){
this.addActionError("验证码输入错误！");
return "checkcodeFail";
}
userService.save(user);
this.addActionMessage("注册成功！请去邮箱激活！");
return "msg";
}
/**
* 用户激活的方法
*/
public String active(){
//根据激活码查询用户：
User existUser=userService.findByCode(user.getCode());
//判断
if(existUser ==null){
//激活码错误
this.addActionMessage("激活失败：激活码错误！");
}else{
//激活成功
//修改用户的状态
existUser.setState(1);
existUser.setCode(null);
userService.update(existUser);
this.addActionMessage("激活成功，请去登陆！");
}
return "msg";
}
/**
* 跳转到登陆页面
*/
public String loginPage(){
return "loginPage";
}
/**
* 登陆的方法
*/
public String login(){
User existUser=userService.login(user);
if(existUser==null){
//登陆失败
this.addActionError("登陆失败：用户名或密码错误或用户未激活！");
return LOGIN;
}else{
//登陆成功
//将用户的信息存入到session中
ServletActionContext.getRequest().getSession().setAttribute("existUser",existUser);
return "loginSuccess";
}
}
/**
* 用户退出的方法
*/
public String quit(){
//销毁session
ServletActionContext.getRequest().getSession().invalidate();
return "quit";
}
}
实体类：编写User的实体类
<strong><span style="font-size:18px;">package cn.itcast.shop.user.vo;
/**
* 用户名模块实体类:
* @author CXC
*CREATE TABLE `user` (
`uid` int(11) NOT NULL AUTO_INCREMENT,
`username` varchar(255) DEFAULT NULL,
`password` varchar(255) DEFAULT NULL,
`name` varchar(255) DEFAULT NULL,
`email` varchar(255) DEFAULT NULL,
`phone` varchar(255) DEFAULT NULL,
`addr` varchar(255) DEFAULT NULL,
`state` int(11) DEFAULT NULL,
`code` varchar(64) DEFAULT NULL,
PRIMARY KEY (`uid`)
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;
*/
public class User {
private Integer uid;
private String username;
private String password;
private String name;
private String email;
private String phone;
private String addr;
private Integer state;
private String code;
public Integer getUid() {
return uid;
}
public void setUid(Integer uid) {
this.uid = uid;
}
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 String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public String getAddr() {
return addr;
}
public void setAddr(String addr) {
this.addr = addr;
}
public Integer getState() {
return state;
}
public void setState(Integer state) {
this.state = state;
}
public String getCode() {
return code;
}
public void setCode(String code) {
this.code = code;
}
}</span></strong>
在User.hbm.xml中添加映射：
<strong><span style="font-size:18px;"><?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="cn.itcast.shop.user.vo.User" table="user">
<id name="uid">
<generator class="native"/>
</id>
<property name="username"/>
<property name="password"/>
<property name="name"/>
<property name="email"/>
<property name="phone"/>
<property name="addr"/>
<property name="state"/>
<property name="code"/>
</class>
</hibernate-mapping></span></strong>配置到Spring中：
4、编写Dao，在这块中UserDao继承HibernateDaoSupport
<strong style="font-family: Arial, Helvetica, sans-serif; font-size: 12px; background-color: rgb(255, 255, 255);"><span style="font-size:18px;"></span></strong>
<strong><span style="font-size:18px;">package cn.itcast.shop.user.dao;</span></strong>
import java.util.List;
import org.springframework.orm.hibernate3.support.HibernateDaoSupport;
import cn.itcast.shop.user.vo.User;
/*
*
* 用户模块持久层代码：
* @author CXC
*
*/
public class UserDao extends HibernateDaoSupport{
//按照名称查询是否有该用户：
public User findByUsername(String username){
String hql = "from User where username = ?";
List<User> list = (List<User>) this.getHibernateTemplate().find(hql, username);
if(list != null && list.size() > 0){
return list.get(0);
}
return null;
}
//注册用户存入数据库的代码实现
public void save(User user){
this.getHibernateTemplate().save(user);
}
// 根据激活码查询用户
public User findByCode(String code) {
String hql = "from User where code = ?";
List<User> list = (List<User>) this.getHibernateTemplate().find(hql,code);
if(list != null && list.size() > 0){
return list.get(0);
}
return null;
}
// 修改用户状态的方法
public void update(User existUser) {
this.getHibernateTemplate().update(existUser);
}
//用户登陆的方法
public User login(User user) {
// TODO Auto-generated method stub
String hql="from User where username= ? and password = ? and state= ?";
List<User> list=(List<User>) this.getHibernateTemplate().find(hql,user.getUsername(),user.getPassword(),1);
if (list !=null && list.size()>0){
return list.get(0);
}
return null;
}
}5、编写Service：将配置注入到sessionFactory中
<!-- 配置用户模块的Action -->
<action name="user_*" class="userAction" method="{1}">
<result name="registPage">/WEB-INF/jsp/regist.jsp</result>事务管理：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context.xsd
http://www.springframework.org/schema/aop
http://www.springframework.org/schema/aop/spring-aop.xsd
http://www.springframework.org/schema/tx
http://www.springframework.org/schema/tx/spring-tx.xsd">
<!-- 配置连接池: -->
<!-- 引入外部属性文件 -->
<context:property-placeholder location="classpath:jdbc.properties"/>
<!-- 配置C3P0连接池 -->
<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">
<property name="driverClass" value="${jdbc.driver}"/>
<property name="jdbcUrl" value="${jdbc.url}"/>
<property name="user" value="${jdbc.user}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!-- Hibernate的相关信息 -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<!-- 注入连接池 -->
<property name="dataSource" ref="dataSource"/>
<!-- 配置Hibernate的其他的属性 -->
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.connection.autocommit">false</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
<!--配置 hibernate的映射文件 -->
<property name="mappingResources">
<list>
<value>cn/itcast/shop/user/vo/User.hbm.xml</value>
</list>
</property>
</bean>
<!-- 事务管理： -->
<!-- 事务管理器 -->
<bean id="transactionManager" class ="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- 开启注解事务 -->
<tx:annotation-driven transaction-manager="transactionManager"/>
<!-- Action的配置 -->
<!-- 首页访问的Action -->
<bean id="indexAction" class="cn.itcast.shop.index.IndexAction" scope="prototype">
<property name="categoryService" ref="categoryService"/>
<property name="productService" ref="productService"/>
</bean>
<!-- 配置验证码的Action -->
<bean id="checkImgAction" class="cn.itcast.shop.user.CheckImgAction" scope="prototype"></bean>
<!-- 用户模块的Action -->
<bean id='userAction' class="cn.itcast.shop.user.UserAction" scope="prototype">
<!-- 注入Service -->
<property name="userService" ref="userService"/>
</bean>
<!-- Service的配置 -->
<bean id='userService' class="cn.itcast.shop.user.service.UserService">
<property name="userDao" ref="userDao"/>
</bean>
<!-- Dao的配置 -->
<bean id='userDao' class="cn.itcast.shop.user.dao.UserDao">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
</beans>总结：
刚开始学习SSH网上商城，接触到了好多东西，SSH（spring structs，hibernate）通过这个项目让我对以后的学习更感兴趣，通过敲这一条线，先来梳理一下简单的逻辑。
