搭建第一个SpringDataJPA工程

第一步：创建maven工程，导入maven坐标

使用Spring Data JPA，需要整合Spring与Spring Data JPA，并且需要提供JPA的服务提供者hibernate，所以需要导入spring相关坐标，hibernate坐标，数据库驱动坐标等

<properties><spring.version>4.2.4.RELEASE</spring.version><hibernate.version>5.0.7.Final</hibernate.version><slf4j.version>1.6.6</slf4j.version><log4j.version>1.2.12</log4j.version><c3p0.version>0.9.1.2</c3p0.version><mysql.version>5.1.6</mysql.version></properties><dependencies><!-- junit单元测试 --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.9</version><scope>test</scope></dependency><!-- spring beg --><dependency><groupId>org.aspectj</groupId><artifactId>aspectjweaver</artifactId><version>1.6.8</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-aop</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-context-support</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-orm</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>${spring.version}</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>${spring.version}</version></dependency><!-- spring end --><!-- hibernate beg --><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-core</artifactId><version>${hibernate.version}</version></dependency><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-entitymanager</artifactId><version>${hibernate.version}</version></dependency><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-validator</artifactId><version>5.2.1.Final</version></dependency><!-- hibernate end --><!-- c3p0 beg --><dependency><groupId>c3p0</groupId><artifactId>c3p0</artifactId><version>${c3p0.version}</version></dependency><!-- c3p0 end --><!-- log end --><dependency><groupId>log4j</groupId><artifactId>log4j</artifactId><version>${log4j.version}</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-api</artifactId><version>${slf4j.version}</version></dependency><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>${slf4j.version}</version></dependency><!-- log end --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>${mysql.version}</version></dependency><dependency><groupId>org.springframework.data</groupId><artifactId>spring-data-jpa</artifactId><version>1.9.0.RELEASE</version></dependency><dependency><groupId>org.springframework</groupId><artifactId>spring-test</artifactId><version>4.2.4.RELEASE</version></dependency><!-- el beg 使用spring data jpa 必须引入 --><dependency>  <groupId>javax.el</groupId>  <artifactId>javax.el-api</artifactId>  <version>2.2.4</version>  </dependency>  <dependency>  <groupId>org.glassfish.web</groupId>  <artifactId>javax.el</artifactId>  <version>2.2.4</version>  </dependency> <!-- el end --></dependencies>

第二步：创建核心配置文件

配置数据源

配置实体管理器工厂

注入数据源

注入实体类扫描

配置Hibernate底层供应商信息

配置JPA事务管理器

注入实体管理器工厂

配置数据仓库dao加强

<?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:jpa="http://www.springframework.org/schema/data/jpa"xsi:schemaLocation="http://www.springframework.org/schema/beanshttp://www.springframework.org/schema/beans/spring-beans.xsdhttp://www.springframework.org/schema/data/jpahttp://www.springframework.org/schema/data/jpa/spring-jpa.xsd"><!-- 1.dataSource 配置数据库连接池，配置数据源--><bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="driverClass" value="com.mysql.jdbc.Driver" /><property name="jdbcUrl" value="jdbc:mysql://localhost:3306/jpa" /><property name="user" value="root" /><property name="password" value="123456" /></bean><!-- 2.配置entityManagerFactory 实体管理器工厂--><bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"><!--配置数据源依赖注入--><property name="dataSource" ref="dataSource" /><!--配置实体类扫描--><property name="packagesToScan" value="com.xszx.beans" /><!--配置底层供应商信息--><property name="persistenceProvider"><bean class="org.hibernate.jpa.HibernatePersistenceProvider" /></property><!--JPA的供应商适配器--><property name="jpaVendorAdapter"><bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"><property name="generateDdl" value="false" /><property name="database" value="MYSQL" /><property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" /><property name="showSql" value="true" /></bean></property><property name="jpaDialect"><bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" /></property><!--注入JPA的配置信息--><property name="jpaProperties"><props><prop key="hibernate.hbm2ddl.auto">create</prop></props></property></bean><!-- 3.事务管理器--><!-- JPA事务管理器  --><bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"><property name="entityManagerFactory" ref="entityManagerFactory" /></bean><!-- 整合spring data jpa,数据层dao的加强配置--><jpa:repositories base-package="com.xszx.dao"transaction-manager-ref="transactionManager"entity-manager-factory-ref="entityManagerFactory"></jpa:repositories></beans>

第三步：创建实体类，标明相关注解

映射注解、表格注解、主键注解、主键生成策略注解

package com.xszx.beans;import javax.persistence.*;@Entity
@Table(name = "t_user")
public class User {@Id@GeneratedValue(strategy = GenerationType.IDENTITY)private int id;private String username;private String password;private int age;public User() {}public User(int id, String username, String password, int age) {this.id = id;this.username = username;this.password = password;this.age = age;}public User(int age, String password, String username) {this.age = age;this.password = password;this.username = username;}public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public int getId() {return id;}public void setId(int id) {this.id = id;}@Overridepublic String toString() {return "User{" +"id=" + id +", username='" + username + '\'' +", password='" + password + '\'' +", age=" + age +'}';}
}

第四步：创建符合SpringDataJPA规范的dao接口

继承JpaRepository,JpaSpecificationExecutor

package com.xszx.dao;import com.xszx.beans.User;
import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.data.jpa.repository.JpaSpecificationExecutor;public interface UserDao extends JpaRepository<User,Integer>,JpaSpecificationExecutor<User> {}

第五步：测试

import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations="classpath:beans.xml")
public class UserTest {@Autowiredprivate UserDao userDao;@Testpublic void add(){User user=new User(18,"123456","1111");userDao.save(user);}}