spring调整hibernate实例

spring整合hibernate实例
新建web工程，添加spring功能，添加hibernate功能
然后反向工程，生成spring整合hibernate的DAO和表格对应的类。
工程的目录结构如：


JavaBean ：

package com.qdu.sun.BO;import org.springframework.context.ApplicationContext;import org.springframework.context.support.ClassPathXmlApplicationContext;import com.qud.sun.hibernate.IUserDAO;import com.qud.sun.hibernate.User;public class Register {private String username;private String password;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 void insert()    {    ApplicationContext ctx=new ClassPathXmlApplicationContext("applicationContext.xml");    IUserDAO dao = (IUserDAO)ctx.getBean("UserDAO");    User user = new User();    user.setPassword(password);    user.setName(username);    dao.save(user);    }}

生成的USerdao：

package com.qud.sun.hibernate;// default packageimport java.util.List;import org.apache.commons.logging.Log;import org.apache.commons.logging.LogFactory;import org.hibernate.LockMode;import org.springframework.context.ApplicationContext;import org.springframework.orm.hibernate3.support.HibernateDaoSupport;/** * A data access object (DAO) providing persistence and search support for User entities. * Transaction control of the save(), update() and delete() operations can directly support Spring container-managed transactions or they can be augmentedto handle user-managed Spring transactions. Each of these methods provides additional information for how to configure it for the desired type of transaction control.  * @see .User  * @author MyEclipse Persistence Tools  */public class UserDAO extends HibernateDaoSupport implements IUserDAO  {    private static final Log log = LogFactory.getLog(UserDAO.class);//property constantspublic static final String NAME = "name";public static final String PASSWORD = "password";protected void initDao() {//do nothing}        public void save(User transientInstance) {        log.debug("saving User instance");        try {            getHibernateTemplate().save(transientInstance);            log.debug("save successful");        } catch (RuntimeException re) {            log.error("save failed", re);            throw re;        }    }    public void delete(User persistentInstance) {        log.debug("deleting User instance");        try {            getHibernateTemplate().delete(persistentInstance);            log.debug("delete successful");        } catch (RuntimeException re) {            log.error("delete failed", re);            throw re;        }    }        public User findById( java.lang.Integer id) {        log.debug("getting User instance with id: " + id);        try {            User instance = (User) getHibernateTemplate()                    .get("User", id);            return instance;        } catch (RuntimeException re) {            log.error("get failed", re);            throw re;        }    }            public List findByExample(User instance) {        log.debug("finding User instance by example");        try {            List results = getHibernateTemplate().findByExample(instance);            log.debug("find by example successful, result size: " + results.size());            return results;        } catch (RuntimeException re) {            log.error("find by example failed", re);            throw re;        }    }            public List findByProperty(String propertyName, Object value) {      log.debug("finding User instance with property: " + propertyName            + ", value: " + value);      try {         String queryString = "from User as model where model."          + propertyName + "= ?"; return getHibernateTemplate().find(queryString, value);      } catch (RuntimeException re) {         log.error("find by property name failed", re);         throw re;      }}public List findByName(Object name) {return findByProperty(NAME, name);}public List findByPassword(Object password) {return findByProperty(PASSWORD, password);}public List findAll() {log.debug("finding all User instances");try {String queryString = "from User"; return getHibernateTemplate().find(queryString);} catch (RuntimeException re) {log.error("find all failed", re);throw re;}}    public User merge(User detachedInstance) {        log.debug("merging User instance");        try {            User result = (User) getHibernateTemplate()                    .merge(detachedInstance);            log.debug("merge successful");            return result;        } catch (RuntimeException re) {            log.error("merge failed", re);            throw re;        }    }    public void attachDirty(User instance) {        log.debug("attaching dirty User instance");        try {            getHibernateTemplate().saveOrUpdate(instance);            log.debug("attach successful");        } catch (RuntimeException re) {            log.error("attach failed", re);            throw re;        }    }        public void attachClean(User instance) {        log.debug("attaching clean User instance");        try {            getHibernateTemplate().lock(instance, LockMode.NONE);            log.debug("attach successful");        } catch (RuntimeException re) {            log.error("attach failed", re);            throw re;        }    }public static UserDAO getFromApplicationContext(ApplicationContext ctx) {    return (UserDAO) ctx.getBean("UserDAO");}public List findByUsername(Object username) {return null;}}

index.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html><head><title>注册</title><meta http-equiv="content-type" content="text/html; charset=GBK"></head><script type="text/javascript">// 验证输入不为空的脚本代码function checkForm(form) {if(form.username.value == "") {alert("用户名不能为空!");form.username.focus();return false;}if(form.password.value == "") {alert("密码不能为空!");form.password.focus();return false;}return true;}</script><body>请输入注册信息<br><form action="insert.jsp" method="post"onsubmit="return checkForm(this);">用户名：<input type="text" name="username"><br>密码：<input type="password" name="password"><br><input type="submit" value="注册" name="submit1"><input type="reset" value="重置" name="reset1"></form></body></html>

insert.jsp

<%@ page language="java" import="java.util.*" pageEncoding="gb2312"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html>  <head>    <base href="<%=basePath%>">        <title>My JSP 'MyJsp.jsp' starting page</title>    <meta http-equiv="pragma" content="no-cache"><meta http-equiv="cache-control" content="no-cache"><meta http-equiv="expires" content="0">    <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"><meta http-equiv="description" content="This is my page"><!--<link rel="stylesheet" type="text/css" href="styles.css">-->  </head>    <body>    <jsp:useBean id="regist" scope="session" />    <jsp:setProperty name="regist" property="*" />    <%       regist.insert();    %>      </body></html>

spring配置文件：

<?xml version="1.0" encoding="UTF-8"?><beansxmlns="http://www.springframework.org/schema/beans"xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"><bean id="sessionFactory"/></property></bean></beans>

然后部署到tomcat上运行tomcat，地址栏中输入访问index.html的URL。

但是，执行完，查看数据时，却发现数据并没有保存进去。这是为啥？不是hibernate的错误，hibernate框架确实执行了对应的插入操作，但是hibernate的操作必须在事务中执行才能够得到正确的结果，而dao类中，只定义了hibernate的操作，并没有涉及到事务提交。

因此，在实际开发中，必须使用spring框架来实现事务的自动提交。有两种方式，一种是用spring1.2的事务代理类，另一种使用spring 2.0中的AOP声明式配置。本实例采用第二种。
只需修改spring的配置文件即可：
在applicationContext.xml中添加如下内容：

<!-- 声明一个 Hibernate 3 的 事务管理器供代理类自动管理事务用 --><bean id="transactionManager"/></property></bean><aop:config><!-- 切入点指明了在执行dao.StudentDAO的所有方法时产生事务拦截操作 --><aop:pointcut id="daoMethods"expression="execution(* com.qdu.sun.hibernate.UserDAO.*(..))" /><!-- 定义了将采用何种拦截操作，这里引用到 txAdvice --><aop:advisor advice-ref="txAdvice" pointcut-ref="daoMethods" /></aop:config><!-- 这是事务通知操作，使用的事务管理器引用自 transactionManager --><tx:advice id="txAdvice" transaction-manager="transactionManager"><tx:attributes><!-- 指定哪些方法需要加入事务，这里懒惰一下全部加入，可以使用通配符来只加入需要的方法 --><tx:method name="*" propagation="REQUIRED" /></tx:attributes></tx:advice>

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