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 package
import 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 augmented to 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 constants
public 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" class="com.qdu.sun.BO.Register" scope="session" />
<jsp:setProperty name="regist" property="*" />
<%
regist.insert();
%>
</body>
</html>
spring配置文件:
<?xml version="1.0" encoding="UTF-8"?>
<beans
xmlns="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"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="configLocation"
value="classpath:hibernate.cfg.xml">
</property>
</bean>
<bean id="UserDAO" class="com.qud.sun.hibernate.UserDAO">
<property name="sessionFactory">
<ref bean="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"
class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory">
<ref local="sessionFactory" />
</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>