<span><!-- Service的配置 =========================== --> <bean> <property ref="userDao"/> </bean> <!-- UserDao的配置 =========================== --> <bean> <property ref="sessionFactory"></property> </bean> </span>
配置好了之后，我们需要在UserDao里面完成查询，具体代码如下所示：
<span>package cn.itcast.shop.user.dao; import org.springframework.orm.hibernate3.support.HibernateDaoSupport; import java.util.List; import cn.itcast.shop.user.vo.User; /** * 用户模块持久层代码 * @author Flower * */ public class UserDao extends HibernateDaoSupport { //按名次查询是否有该用户 public User findByUsername (String username){ String hql ="from User where username= ?"; List <User> list=this.getHibernateTemplate().find(hql,username); if(list !=null && list.size() > 0){ return list.get(0); } return null; } } </span>
接着，我们需要在service里面完成对Dao的调用，具体代码如下所示：
<span>package cn.itcast.shop.user.service; import org.springframework.transaction.annotation.Transactional; import cn.itcast.shop.user.dao.UserDao; import cn.itcast.shop.user.vo.User; /** * 用户模块业务层代码 * @author Flower * */ @Transactional public class UserService { //注入UserDao private UserDao userDao; public void setUserDao(UserDao userDao){ this.userDao =userDao; } //按用户名查询用户的方法 public User findByUsername (String username){ return userDao.findByUsername(username); } } </span>
接着我们需要在UserAction中进行调用，具体代码如下所示：
<span>package cn.itcast.shop.user.action; import java.io.IOException; import javax.servlet.http.HttpServletResponse; import org.apache.struts2.ServletActionContext; import cn.itcast.shop.user.service.UserService; import cn.itcast.shop.user.vo.User; import com.opensymphony.xwork2.ActionSupport; import com.opensymphony.xwork2.ModelDriven; /** * 用户模块Action的类 * @author Flower * */ public class UserAction extends ActionSupport implements ModelDriven<User> { //模型驱动使用的对象 private User user = new User(); public User getModel(){ return user; } //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进行异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'>用户名已经存在</font>"); } return NONE; } /** * 用戶注册的方法： */ public String regist(){ return NONE; } } </span>
最后，我们来编写映射文件里面的内容，具体代码如下所示：
<span><?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 table="user"> <id> <generator/> </id> <property/> <property/> <property/> <property/> <property/> <property/> <property/> <property/> </class> </hibernate-mapping></span>
不要忘记了，要把她陪到applicationContext里面，具体代码如下所示：
<span><!-- 配置Hibernate的其他的属性 --> <property> <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> <list> <value>cn/itcast/shop/user/vo/User.hbm.xml</value> </list> </property> </span>
代码到此结束，下面给大家展示下效果图：
小编总结：