springMVC之事务配置（问题来源：为什么数据保存不了）

一 问题来源

自己的亲身体会，来源问题this.sessionFactory.getCurrentSession().save(obj);保存不了数据。

二、解决方法

原因在springMVC配置事务时，事务注解应该在类扫描注解之后，然后在到相对应dao层的方法要加@Transaction

全注解配置如下：

第一步，首先看一下web.xml，如下：

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns="http://java.sun.com/xml/ns/javaee"
    xmlns:web="http://java.sun.com/xml/ns/javaee"
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
        http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"
        id="WebApp_ID" version="3.0">
  <display-name>Archetype Created Web Application</display-name>
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:/spring-*.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  <servlet>
    <servlet-name>lei-dispatcher</servlet-name>
    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
    <init-param>
      <param-name>contextConfigLocation</param-name>
      <param-value>classpath:/lei-dispatcher-servlet.xml</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>lei-dispatcher</servlet-name>
    <url-pattern>/</url-pattern>
  </servlet-mapping>
</web-app>

　　

第二步，spring-hibernate配置，见以下spring-hibernate.xml配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:aop="http://www.springframework.org/schema/aop" xmlns:context="http://www.springframework.org/schema/context"
    xmlns:p="http://www.springframework.org/schema/p" xmlns:tx="http://www.springframework.org/schema/tx"
    xmlns:mvc="http://www.springframework.org/schema/mvc" 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-3.0.xsd
            http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
            http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
            http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
            http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd">
<!-- 配置数据源 -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
		<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
		<property name="url" value="jdbc:mysql://localhost:3306/test?characterEncoding=UTF-8"/>
		<property name="username" value="root"/>
		<property name="password" value="root"/>
	</bean>

<!-- 配置sessionFactory-->
	<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
		<property name="dataSource" ref="dataSource"/>
		<property name="hibernateProperties">
			<props>
				<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
				<prop key="hibernate.hbm2ddl.auto">update</prop>
                <prop key="hibernate.show_sql">true</prop>
                <prop key="hiberante.format_sql">true</prop>
                <prop key="current_session_context_class">thread</prop>
			</props>
		</property>
		<property name="configLocations">
			<list>
				<value>
					classpath*:hibernate.cfg.test.xml
				</value>
			</list>
		</property>
	</bean>

	<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
		<property name="sessionFactory" ref="sessionFactory"></property>
	</bean>

</beans>

　　第三步:springMVC配置

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:context="http://www.springframework.org/schema/context"
 xmlns:p="http://www.springframework.org/schema/p"
 xmlns:mvc="http://www.springframework.org/schema/mvc"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xmlns:tx="http://www.springframework.org/schema/tx"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
      http://www.springframework.org/schema/context
      http://www.springframework.org/schema/context/spring-context.xsd
      http://www.springframework.org/schema/mvc
      http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd
       http://www.springframework.org/schema/tx
        http://www.springframework.org/schema/tx/spring-tx-4.0.xsd
      ">

	<!-- 注解扫描包 -->
	<context:component-scan base-package="com.example.*"/>

	 <tx:annotation-driven transaction-manager="transactionManager"/>

	<!-- 引入注解类
		下面两个都可以注释
	 -->
	<mvc:annotation-driven/>
<!-- 	<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"/> -->

<!-- 	<bean class="org.springframework.web.servlet.mvc.annotation.DefaultAnnotationHandlerMapping" /> -->

	<!-- 文件上传配置 -->
	<bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver">
		  <property name="defaultEncoding" value="utf-8" />
	      <property name="maxUploadSize" value="10485760000" />
	      <property name="maxInMemorySize" value="40960" />
	</bean>

	<!-- 静态资源访问配置 -->
	<mvc:resources location="/img/" mapping="/img/**"/>
	<mvc:resources location="/topui/" mapping="/topui/**"/>
	<!-- 视图解析器 -->
	<bean id="viewResolver" class="org.springframework.web.servlet.view.InternalResourceViewResolver">
		<property name="prefix" value="/"></property>
		<property name="suffix" value=".jsp"></property>
	</bean>
 </beans>

　　到这配置完毕，相对应的dao层如下：

package com.example.dao.impl;

import java.util.List;

import javax.annotation.Resource;

import org.hibernate.SessionFactory;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;

import com.example.dao.IFilesDAO;
import com.example.entity.Files;

@Repository
public class FilesDAO implements IFilesDAO{

	@Resource
	private SessionFactory sessionFactory;

	@SuppressWarnings("unchecked")
	@Override
	public List<Files> findFilesList(String id) {
		// TODO Auto-generated method stub
		return this.sessionFactory.getCurrentSession().createQuery("from Files where id='" + id+"'").list();
	}

	@Transactional
	@Override
	public void deleteFile(Files file) {
		this.sessionFactory.getCurrentSession().delete(file);
	}

	@Transactional
	@Override
	public void updateFile(Files file) {
		// TODO Auto-generated method stub
		this.sessionFactory.getCurrentSession().update(file);
	}

	@Transactional
	@Override
	public void saveFiles(Files file) {
		// TODO Auto-generated method stub
		System.out.println(file.getId());
		this.sessionFactory.getCurrentSession().save(file);
		System.out.println(file.getId());
	}

}

　　具体展示如下,其实spring事务配置还有其他配置方式。如需看可以访问《Spring事务配置的5种方法》

三 参考文章：

http://www.cnblogs.com/leiOOlei/p/3725911.html