本文主要是介绍【SSH网上商城】——AJAX异步验证是否存在该用户名,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
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" οnblur="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+, SafarixmlHttp=new XMLHttpRequest();}catch (e){try{// Internet ExplorerxmlHttp=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:
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UserServiceprivate 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sessionServletActionContext.getRequest().getSession().invalidate();return "quit";}}
<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 stubString 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.xsdhttp://www.springframework.org/schema/contexthttp://www.springframework.org/schema/context/spring-context.xsdhttp://www.springframework.org/schema/aophttp://www.springframework.org/schema/aop/spring-aop.xsdhttp://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。
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