spring mvc + jpa

最近看到公司一同事在玩spring mvc,知道spring mvc已经出了很久了，空闲之余本人就整合了一下springmvc + jpa,其中jpa的实现还是Hibernate

现在注解是大行其道。

让我们回顾一下:

1、以前的servlet一定要在web.xml里配置每一个servlet，现在只要在servlet类上面配置下注解就可以。

2、struts的每一个Action请求要在struts.xml文件配置，不过也可以通过注解来配置每一个action请求@Repository("userDao")

3、在j2ee中每一个dao 或 service的bean要在spring.xml，其实也可能用注解来配置 @Repository("userDao") || @Service("userService")

4、spring mvc  在处理请求的时候是用Controller来实现，它可以在spring配置文件里去配置请求，用注解也不在话下了@Controller@RequestMapping("/user.do")

现在就来讲解下整合步骤：

step 1：配置下web.xml文件

在web.xml配置下将请求转交给spring去处理，

 <servlet>
  <servlet-name>dispatcher</servlet-name>
  <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>
  <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
  <servlet-name>dispatcher</servlet-name>
  <url-pattern>*.do</url-pattern>
  </servlet-mapping>

step 2：在WEB-INF里配置个dispatcher-servlet.xml

//下面是声明你可以用注解来配置controller，这样我们以后用注解来配置每一个请求就好了，不用在spring配置文件去配置每一个请求

<mvc:annotation-driven />  
<context:component-scan base-package="com.kwok.springmvc.controller" />

 <bean class="org.springframework.web.servlet.view.InternalResourceViewResolver">  
        <property name="prefix" value="/WEB-INF/views/" />  
        <property name="suffix" value=".jsp" />  
 </bean> 

step3：请求这一步骤讲解了，接下来就配置jpa用hibernate实现怎么整合spring, 然后再junit测试下

配置Hibernate的数据库连接时，一般的工作流程都是先配置dataSource，再配置sessionFactory，然后配置事件管理，这个就不做详细的解释

下面是db.properties文件

jdbc.driverClass=com.mysql.jdbc.Driverjdbc.url=jdbc:mysql://localhost:3306/mvc?useUnicode=true&characterEncoding=utf-8&autoReconnect=truejdbc.user=rootjdbc.password=123jdbc.dialect=org.hibernate.dialect.MySQL5Dialect#jdbc.dialect=org.hibernate.dialect.MySQLInnoDBDialectjdbc.initialPoolSize=2jdbc.maxPoolSize=200jdbc.batch_size=20jdbc.hbm2ddl.auto=updatejdbc.query.substitutions=true 1, false 0, yes ''Y'', no ''N''

Hibernate 在spring中的配置

<?xml version="1.0" encoding="UTF-8"?> <!-- <!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd"> --><beans xmlns="http://www.springframework.org/schema/beans"xmlns:aop="http://www.springframework.org/schema/aop" xmlns:p="http://www.springframework.org/schema/p"xmlns:tx="http://www.springframework.org/schema/tx" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xmlns:context="http://www.springframework.org/schema/context"xsi:schemaLocation="http://www.springframework.org/schema/beans  http://www.springframework.org/schema/beans/spring-beans-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.xsdhttp://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.1.xsd"><!-- 配置占位符 --><beanclass="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"><property name="location" value="classpath:db.properties" /></bean><!-- 数据源 --><bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close" abstract="false"         lazy-init="default" autowire="default"><property name="driverClassName" value="${jdbc.driverClass}"/><property name="url" value="${jdbc.url}"/><property name="username" value="${jdbc.user}"/><property name="password" value="${jdbc.password}"/></bean><!-- 配置一个sessionFactory --><bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean"><property name="dataSource" ref="dataSource"/><property name="hibernateProperties"><props><prop key="hibernate.dialect">${jdbc.dialect}</prop><prop key="hibernate.hbm2ddl.auto">${jdbc.hbm2ddl.auto}</prop><prop key="hibernate.jdbc.batch_size">${jdbc.batch_size}</prop><prop key="hibernate.cache.use_second_level_cache">false</prop><prop key="hibernate.query.substitutions">${jdbc.query.substitutions}</prop><prop key="hibernate.show_sql">false</prop><prop key="hibernate.format_sql">true</prop></props></property><property name="packagesToScan"><list><value>com.kwok.springmvc.module.entity</value></list></property></bean><context:annotation-config/><context:component-scan base-package="com.kwok.springmvc" /><bean id="myTxManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">    <property name="sessionFactory" ref="sessionFactory" />    <property name="dataSource" ref="dataSource"/>  </bean><tx:annotation-driven transaction-manager="transactionManager" /><!-- hibernateTemplate --><bean id="hibernateTemplate" class="org.springframework.orm.hibernate3.HibernateTemplate"><property name="sessionFactory" ref="sessionFactory"></property></bean></beans>

step4：接下来都是Entity,Controller,Service,Dao之间的注解来完成业务逻辑,下面是每一个层的注解啦

@Entity
@Table(name="mvc_user")

@Controller
@RequestMapping("/user.do")

@Service("userService")

@Repository("userDao")

step4：Junit4的单元测试

package com.kwok.springmvc.junit;import org.junit.Test;import org.junit.runner.RunWith;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.test.context.ContextConfiguration;import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;import org.springframework.test.context.transaction.TransactionConfiguration;import com.kwok.springmvc.module.entity.User;import com.kwok.springmvc.service.UserService;@RunWith(SpringJUnit4ClassRunner.class)@ContextConfiguration({"/applicationContext.xml"})@TransactionConfiguration(transactionManager="myTxManager",defaultRollback=false)public class ServiceJunit {@Autowiredprivate UserService userService;@Testpublic void testInsert(){User user = new User();user.setName("wfung_kwok2");user.setPassword("wfung_kwok");user.setEmail("[e-mail]");user.setStatus(true);userService.insert(user);}@Testpublic void testGet(){/*User user = userService.get((long)2);System.out.println(user.getName());List<User> users = getUserService().findAllByCondition("1=1", null, 0, 0);for(User u : users){System.out.println(u.getId());}user.setPassword("!@#$%");userService.update(user);*/Object o = userService.queryObjcet("select count(*) from User where 1=1", null);System.out.println((Long)o);}public void setUserService(UserService userService) {this.userService = userService;}}