Springmvc + 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，

 
  dispatcher
  org.springframework.web.servlet.DispatcherServlet
  1
 
 
  dispatcher
  *.do
 

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

 

   
         
         
  

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

Hibernate 在spring中的配置

 xml version="1.0" encoding="UTF-8"?>

 <beans xmlns="http://www.springframework.org/schema/beans"
     xmlns:aop="http://www.springframework.org/schema/aop"
     xmlns: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.xsd
     http://www.springframework.org/schema/context
     http://www.springframework.org/schema/context/spring-context-3.1.xsd">


     <bean
         class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
         <property name="location" value="classpath:db.properties" />
     bean>


     <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>

     <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">${jdbc.batch_size}prop>
                 <prop key="hibernate.cache.use_second_level_cache">falseprop>
                 <prop key="hibernate.query.substitutions">${jdbc.query.substitutions}prop>
                 <prop key="hibernate.show_sql">falseprop>
                 <prop key="hibernate.format_sql">trueprop>
             props>
         property>
         <property name="packagesToScan">
             <list>
                 <value>com.kwok.springmvc.module.entityvalue>
             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" />


     <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 {

     @Autowired
     private UserService userService;

     @Test
     public void testInsert(){
         User user = new User();
         user.setName("wfung_kwok2");
         user.setPassword("wfung_kwok");
         user.setEmail("[email protected]");
         user.setStatus(true);
         userService.insert(user);
     }

     @Test
     public void testGet(){
         /*User user = userService.get((long)2);
         System.out.println(user.getName());
         List 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;
     }

 }