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Spring Data JPA初使用(转载)

时间:2014-09-12 13:11:13      阅读:319      评论:0      收藏:0      [点我收藏+]

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 我们都知道Spring是一个非常优秀的JavaEE整合框架,它尽可能的减少我们开发的工作量和难度。

  在持久层的业务逻辑方面,Spring开源组织又给我们带来了同样优秀的Spring Data JPA。

  通常我们写持久层,都是先写一个接口,再写接口对应的实现类,在实现类中进行持久层的业务逻辑处理。

  而现在,Spring Data JPA帮助我们自动完成了持久层的业务逻辑处理,我们要做的,仅仅是声明一个持久层接口。

 

  1、下载开发所需要的发布包。

    1)spring-framework-3.1.2.RELEASE-with-docs.zip  

      下载地址:http://www.springsource.org/spring-framework

    2)hibernate-release-4.1.6.Final.zip

      下载地址:http://olex.openlogic.com/packages/hibernate

    3)Spring Data JPA

      Spring Data JPA

        下载地址:http://www.springsource.org/spring-data/jpa

      Spring Data Commons

        下载地址:http://www.springsource.org/spring-data/commons

    4)其他一些依赖包可以从 http://ebr.springsource.com/repository/app/library 上查找下载

 

  2、新建一个Web项目 spring-data-jpa,把相应的jar包放到/WebRoot/WEB-INF/lib目录下。

    我也没有挑选哪些是不需要的,最后用到的jar如下:

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antlr-2.7.7.jar
com.springsource.net.sf.cglib-2.2.0.jar
com.springsource.org.aopalliance-1.0.0.jar
com.springsource.org.apache.commons.logging-1.1.1.jar
com.springsource.org.aspectj.weaver-1.6.3.RELEASE.jar
commons-lang3-3.1.jar
dom4j-1.6.1.jar
hibernate-commons-annotations-4.0.1.Final.jar
hibernate-core-4.1.6.Final.jar
hibernate-entitymanager-4.1.6.Final.jar
hibernate-jpa-2.0-api-1.0.1.Final.jar
javassist-3.15.0-GA.jar
jboss-logging-3.1.0.GA.jar
jboss-transaction-api_1.1_spec-1.0.0.Final.jar
log4j-1.2.17.jar
mysql-connector-java-5.0.4-bin.jar
org.springframework.aop-3.1.2.RELEASE.jar
org.springframework.asm-3.1.2.RELEASE.jar
org.springframework.aspects-3.1.2.RELEASE.jar
org.springframework.beans-3.1.2.RELEASE.jar
org.springframework.context-3.1.2.RELEASE.jar
org.springframework.context.support-3.1.2.RELEASE.jar
org.springframework.core-3.1.2.RELEASE.jar
org.springframework.expression-3.1.2.RELEASE.jar
org.springframework.instrument-3.1.2.RELEASE.jar
org.springframework.instrument.tomcat-3.1.2.RELEASE.jar
org.springframework.jdbc-3.1.2.RELEASE.jar
org.springframework.jms-3.1.2.RELEASE.jar
org.springframework.js.resources-2.3.0.RELEASE.jar
org.springframework.orm-3.1.2.RELEASE.jar
org.springframework.oxm-3.1.2.RELEASE.jar
org.springframework.test-3.1.2.RELEASE.jar
org.springframework.transaction-3.1.2.RELEASE.jar
org.springframework.web-3.1.2.RELEASE.jar
org.springframework.web.portlet-3.1.2.RELEASE.jar
org.springframework.web.servlet-3.1.2.RELEASE.jar
slf4j-api-1.6.6.jar
slf4j-log4j12-1.6.6.jar
spring-data-commons-core-1.3.0.M1.jar
spring-data-jpa-1.0.2.RELEASE.jar
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  3、在MySql数据库中建立一个叫spring_data_jpa的数据库。

create database spring_data_jpa default character set utf8;

 

  4、JPA配置文件persistence.xml

    1)在src目录下建立一个叫META-INF的文件夹

    2)在META-INF文件夹下建立persistence.xml文件

      persistence.xml内容如下:

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<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" 
            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
            xsi:schemaLocation="http://java.sun.com/xml/ns/persistence 
            http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
            
    <persistence-unit name="myJPA" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.ejb.HibernatePersistence</provider>  
        <properties>
            <!--配置Hibernate方言 -->
            <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect" />
            <!--配置数据库驱动 -->
            <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver" />
            <!--配置数据库用户名 -->
            <property name="hibernate.connection.username" value="root" />
            <!--配置数据库密码 -->
            <property name="hibernate.connection.password" value="root" />
            <!--配置数据库url -->
            <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/spring_data_jpa?useUnicode=true&amp;characterEncoding=UTF-8" />
            <!--设置外连接抓取树的最大深度 -->
            <property name="hibernate.max_fetch_depth" value="3" />
            <!--自动输出schema创建DDL语句 -->
            <property name="hibernate.hbm2ddl.auto" value="update" />    
            <property name="hibernate.show_sql" value="true" />
            <property name="hibernate.format_sql" value="true" />
            <property name="javax.persistence.validation.mode" value="none"/>
        </properties>
    </persistence-unit>
            
</persistence>
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  5、Spring配置文件applicationContext.xml

   在src目录下建立applicationContext.xml

   applicationContext.xml内容如下:

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<?xml version="1.0" encoding="UTF-8"?>  
<beans xmlns="http://www.springframework.org/schema/beans"  
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"  
    xmlns:context="http://www.springframework.org/schema/context"  
    xmlns:aop="http://www.springframework.org/schema/aop"  
    xmlns:tx="http://www.springframework.org/schema/tx"  
    xmlns:p="http://www.springframework.org/schema/p"  
    xmlns:cache="http://www.springframework.org/schema/cache"  
    xmlns:jpa="http://www.springframework.org/schema/data/jpa"
    
    xsi:schemaLocation="http://www.springframework.org/schema/beans   
          http://www.springframework.org/schema/beans/spring-beans-3.1.xsd   
          http://www.springframework.org/schema/context   
          http://www.springframework.org/schema/context/spring-context-3.1.xsd   
          http://www.springframework.org/schema/aop   
          http://www.springframework.org/schema/aop/spring-aop-3.1.xsd   
          http://www.springframework.org/schema/tx    
          http://www.springframework.org/schema/tx/spring-tx-3.1.xsd
          http://www.springframework.org/schema/cache 
          http://www.springframework.org/schema/cache/spring-cache-3.1.xsd
          http://www.springframework.org/schema/data/jpa
          http://www.springframework.org/schema/data/jpa/spring-jpa.xsd">  
        
        <context:annotation-config />  
        
        <context:component-scan base-package="cn.luxh.app"/>
       
        <!-- 定义实体管理器工厂 -->
        <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">  
             <property name="persistenceUnitName" value="myJPA"/>
        </bean>
         
         <!-- 配置事务管理器 -->  
           <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">  
            <property name="entityManagerFactory" ref="entityManagerFactory" />  
           </bean> 
       
          <!-- 启用 annotation事务--> 
           <tx:annotation-driven transaction-manager="transactionManager"/> 
           
           <!-- 配置Spring Data JPA扫描目录--> 
           <jpa:repositories base-package="cn.luxh.app.repository"/>

        
       
</beans>
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  6、web.xml

  web.xml内容如下:

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<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" 
    xmlns="http://java.sun.com/xml/ns/javaee" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
    xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
    http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <display-name></display-name>    
  
   <!-- log4j配置 -->
  <context-param>
    <param-name>webAppRootKey</param-name>
    <param-value>springdatajpa.root</param-value>
  </context-param>
  <context-param>
    <param-name>log4jConfigLocation</param-name>
    <param-value>classpath:log4j.properties</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
  </listener>
  
  <!-- 编码过滤器 -->
  <filter>
    <filter-name>characterEncodingFilter</filter-name>
    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>
    <init-param>
          <param-name>encoding</param-name>
          <param-value>UTF-8</param-value>
    </init-param>
    
    
  </filter>
  <filter-mapping>
    <filter-name>characterEncodingFilter</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  
  <!-- 配置spring监听器 -->
  <context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>classpath:applicationContext.xml</param-value>
  </context-param>
  <listener>
    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
  </listener>
  
  <!-- 配置缓存清除监听器,负责处理由 JavaBean Introspector 功能而引起的缓存泄露 -->
  <listener>  
      <listener-class>org.springframework.web.util.IntrospectorCleanupListener</listener-class>  
  </listener> 
  
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
</web-app>
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  7、日志配置

    在src目录下建立log4j.properties文件

    log4j.properties内容如下:

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log4j.rootLogger=INFO,CONSOLE,FILE
log4j.addivity.org.apache=true 
# 应用于控制台 
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender 
log4j.appender.Threshold=INFO 
log4j.appender.CONSOLE.Target=System.out 
log4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayout 
log4j.appender.CONSOLE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n 
#log4j.appender.CONSOLE.layout.ConversionPattern=[start]%d{DATE}[DATE]%n%p[PRIORITY]%n%x[NDC]%n%t[THREAD] n%c[CATEGORY]%n%m[MESSAGE]%n%n 
#应用于文件 
log4j.appender.FILE=org.apache.log4j.DailyRollingFileAppender
log4j.appender.FILE.File=${springdatajpa.root}/springdatajpa.log 
log4j.appender.FILE.Append=true 
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout 
log4j.appender.FILE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n 
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  8、所有环境配完毕,开始写一个Spring Data JPA 的增删改查

    1)建立相应的包

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    2)领域模型实体类User

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package cn.luxh.app.domain;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

/**
 * 用户信息
 * @author Luxh
 * 2012-8-30
 */
@Entity
@Table(name="t_user")
public class User {
    
    @Id
    @GeneratedValue
    private Integer id;
    
    //账号
    private String account;
    
    //姓名
    private String name;
    
    //密码
    private String password;
    
    
    //省略 getter和setter方法

}
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    3)声明持久层接口UserRepository

    让UserRepository接口继承CrudRepository<T,ID>,T是领域实体,ID是领域实体的主键类型。CrudRepository实现了相应的增删改查方法。

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package cn.luxh.app.repository;


import org.springframework.data.repository.CrudRepository;

import cn.luxh.app.domain.User;

/**
 * 用户持久层接口
 * @author Luxh
 * 2012-8-31
 */
public interface UserRepository extends CrudRepository<User,Integer>{
    
    
}
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    不再需要持久层接口实现类。

 

    4)业务层

      一般多层架构是控制层调用业务层,业务层再调用持久层。所以这里写个业务层。

      a、业务层接口:

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package cn.luxh.app.service;

import cn.luxh.app.domain.User;

/**
 * 用户业务接口
 * @author Luxh
 * 2012-8-31
 */
public interface UserService {
    
    /**
     * 保存用户
     * @param user
     */
    void saveUser(User user);
    
    /**
     * 根据id查找用户
     * @param id
     * @return
     */
    User findUserById(Integer id);
    
    /**
     * 更新用户
     * @param user
     */
    void updateUser(User user);
    
    /**
     * 根据ID删除用户
     * @param id
     */
    void deleteUserById(Integer id);
    
    
}
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    b、业务层接口实现类

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package cn.luxh.app.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import cn.luxh.app.domain.User;
import cn.luxh.app.repository.UserRepository;

/**
 * 用户业务服务实现类
 * @author Luxh
 * 2012-8-31
 */
@Service("userService")
public class UserServiceImpl implements UserService{
    
    
    @Autowired
    private UserRepository userRepository;//注入UserRepository

    @Override
    @Transactional
    public void saveUser(User user) {
        userRepository.save(user);
        
    }

    @Override
    @Transactional(readOnly=true)
    public User findUserById(Integer id) {
        return userRepository.findOne(id);
    }

    
    @Override
    @Transactional
    public void updateUser(User user) {
        userRepository.save(user);
    }

    @Override
    @Transactional
    public void deleteUserById(Integer id) {
        userRepository.delete(id);
    }

}
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  9)编写测试用例

    在执行测试的时候,发现如下错误:

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Caused by: java.lang.NoSuchMethodError: javax.persistence.spi.PersistenceUnitInfo.getValidationMode()Ljavax/persistence/ValidationMode;
    at org.hibernate.ejb.Ejb3Configuration.configure(Ejb3Configuration.java:633)
    at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:73)
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:268)
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:310)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1514)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452)
    ... 51 more
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  网上说是新版本的Hibernate跟javaee.jar里面的JPA接口冲突了。

  解决方法:移除MyEclipse自带的Java EE 5 Libraries,自己新建一个user libraries,加入Java EE中的jsf-api.jar、jsf-impl.jar和jstl-1.2.jar,再加入Tomcat中自带的     servlet-api.jar

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       bubuko.com,布布扣

       

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  用servlet-api.jar替换掉javaee.jar就没问题了。

  测试代码:

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package cn.luxh.app.test;

import org.junit.Assert;
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 cn.luxh.app.domain.User;
import cn.luxh.app.service.UserService;

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration({"/applicationContext.xml"}) 
public class UserTest {
    
    @Autowired
    private UserService userService;
    
    //保存用户
    @Test
    public void testSaveUser() {
        User user = new User();
        user.setAccount("LiHuai");
        user.setName("李坏");
        user.setPassword("123456");
        
        userService.saveUser(user);
    }
    
    
    //根据id查找用户
    @Test
    public void testFindUserById() {
        Integer id = 1;
        User user = userService.findUserById(id);
        Assert.assertEquals("李坏",user.getName());
    }
    
    //更新用户
    @Test
    public void testUpdateUser() {
        Integer id = 1;
        User user = userService.findUserById(id);
        user.setName("李寻欢");
        
        userService.updateUser(user);
        
    }
    
    //根据id删除用户
    @Test
    public void testDeleteUserById() {
        Integer id = 1;
        
        userService.deleteUserById(id);
    }

}
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  使用Spring Data JPA相当的简单,我们只需要定义持久层的接口,不需要编写实现代码。

  步骤和注意点:

  1)在spring配置文件中添加仓库接口的扫描路径 <jpa:repositories base-package="cn.luxh.app.repository"/>

  2)编写领域实体,需要按照JPA规范

  3)编写仓库Repository<T,ID>接口,依靠Spring Data规范定义接口方法。

     比如按照规范定义一个数据访问接口方法  List<User> findByName(String name);

     Spring Data JPA 就会自动转化为 select u from User u where u.name = ?1

  


 

  可以使用的仓库接口有:
    Repository:           是 Spring Data的一个核心接口,它不提供任何方法,开发者需要在自己定义的接口中声明需要的方法。

    CrudRepository:          继承Repository,提供增删改查方法,可以直接调用。

    PagingAndSortingRepository:    继承CrudRepository,具有分页查询和排序功能

    JpaRepository:                         继承PagingAndSortingRepository,针对JPA技术提供的接口

    JpaSpecificationExecutor:          可以执行原生SQL查询

Spring Data JPA初使用(转载)

标签:blog   http   io   os   使用   java   ar   strong   for   

原文地址:http://www.cnblogs.com/wjwen/p/3968082.html

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