Spring Data JPA HelloWorld

使用 Spring Data JPA 进行持久层开发需要的四个步骤：

配置 Spring 整合 JPA
在 Spring 配置文件中配置 Spring Data，让 Spring 为声明的接口创建代理对象。配置了 <jpa:repositories> 后，Spring 初始化容器时将会扫描 base-package 指定的包目录及其子目录，为继承 Repository 或其子接口的接口创建代理对象，并将代理对象注册为 Spring Bean，业务层便可以通过 Spring 自动封装的特性来直接使用该对象。
声明持久层的接口，该接口继承 Repository，Repository 是一个标记型接口，它不包含任何方法，如必要，Spring Data 可实现 Repository 其他子接口，其中定义了一些常用的增删改查，以及分页相关的方法。
在接口中声明需要的方法。Spring Data 将根据给定的策略（具体策略稍后讲解）来为其生成实现代码。

搭建环境

pom.xml

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"><modelVersion>4.0.0</modelVersion><groupId>com.ifox.hgx</groupId><artifactId>springData</artifactId><version>1.0-SNAPSHOT</version><packaging>war</packaging><name>springData Maven Webapp</name><!-- FIXME change it to the project's website --><url>http://www.example.com</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding><maven.compiler.source>1.8</maven.compiler.source><maven.compiler.target>1.8</maven.compiler.target></properties><dependencies><!-- https://mvnrepository.com/artifact/org.springframework/spring-context --><dependency><groupId>org.springframework</groupId><artifactId>spring-context</artifactId><version>5.0.3.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-core --><dependency><groupId>org.springframework</groupId><artifactId>spring-core</artifactId><version>5.0.3.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-beans --><dependency><groupId>org.springframework</groupId><artifactId>spring-beans</artifactId><version>5.0.3.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-web --><dependency><groupId>org.springframework</groupId><artifactId>spring-web</artifactId><version>5.0.3.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc --><dependency><groupId>org.springframework</groupId><artifactId>spring-webmvc</artifactId><version>5.0.3.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-jdbc --><dependency><groupId>org.springframework</groupId><artifactId>spring-jdbc</artifactId><version>5.0.3.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework/spring-orm --><dependency><groupId>org.springframework</groupId><artifactId>spring-orm</artifactId><version>5.0.3.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core --><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-core</artifactId><version>5.2.13.Final</version></dependency><!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-entitymanager --><dependency><groupId>org.hibernate</groupId><artifactId>hibernate-entitymanager</artifactId><version>5.2.13.Final</version></dependency><!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-jpa --><dependency><groupId>org.springframework.data</groupId><artifactId>spring-data-jpa</artifactId><version>2.0.3.RELEASE</version></dependency><!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java --><dependency><groupId>mysql</groupId><artifactId>mysql-connector-java</artifactId><version>5.1.38</version></dependency><!-- https://mvnrepository.com/artifact/com.mchange/c3p0 --><dependency><groupId>com.mchange</groupId><artifactId>c3p0</artifactId><version>0.9.5.2</version></dependency><!-- https://mvnrepository.com/artifact/org.slf4j/slf4j-log4j12 --><dependency><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId><version>1.7.25</version><scope>test</scope></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.11</version><scope>test</scope></dependency></dependencies>

配置文件: applicationContext.xml

<?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:tx="http://www.springframework.org/schema/tx"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.xsd   http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/data/jpa http://www.springframework.org/schema/data/jpa/spring-jpa.xsd"><!-- 配置自动扫描的包 --><context:component-scan base-package="com.ifox.hgx.springdata"></context:component-scan><!-- 1. 配置数据源 --><context:property-placeholder location="classpath:db.properties"/><bean id="dataSource"class="com.mchange.v2.c3p0.ComboPooledDataSource"><property name="user" value="${jdbc.user}"></property><property name="password" value="${jdbc.password}"></property><property name="driverClass" value="${jdbc.driverClass}"></property><property name="jdbcUrl" value="${jdbc.url}"></property><!-- 配置其他属性 --></bean><!-- 2. 配置 JPA 的 EntityManagerFactory --><bean id="entityManagerFactory"class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"><property name="dataSource" ref="dataSource"></property><property name="jpaVendorAdapter"><bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"></bean></property><property name="packagesToScan" value="com.ifox.hgx.springdata"></property><property name="jpaProperties"><props><!-- 二级缓存相关 --><!--<prop key="hibernate.cache.region.factory_class">org.hibernate.cache.ehcache.EhCacheRegionFactory</prop><prop key="net.sf.ehcache.configurationResourceName">ehcache-hibernate.xml</prop>--><!-- 生成的数据表的列的映射策略 --><prop key="hibernate.ejb.naming_strategy">org.hibernate.cfg.ImprovedNamingStrategy</prop><!-- hibernate 基本属性 --><prop key="hibernate.dialect">org.hibernate.dialect.MySQL57Dialect</prop><prop key="hibernate.show_sql">true</prop><prop key="hibernate.format_sql">true</prop><prop key="hibernate.hbm2ddl.auto">update</prop></props></property></bean><!-- 3. 配置事务管理器 --><bean id="transactionManager"class="org.springframework.orm.jpa.JpaTransactionManager"><property name="entityManagerFactory" ref="entityManagerFactory"></property></bean><!-- 4. 配置支持注解的事务 --><tx:annotation-driven transaction-manager="transactionManager"/><!-- 5. 配置 SpringData --><!-- 加入  jpa 的命名空间 --><!-- base-package: 扫描 Repository Bean 所在的 package --><jpa:repositories base-package="com.ifox.hgx.springdata"entity-manager-factory-ref="entityManagerFactory"></jpa:repositories>
</beans>

数据库连接配置:db.properties

jdbc.url = jdbc:mysql://localhost:3306/JPA?useSSL=true
jdbc.user = root
jdbc.password = 123456
jdbc.driverClass = com.mysql.jdbc.Driver

log4j配置文件:log4j.properties

log4j.rootLogger=WARN, stdout, R
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d [%t] %-5p %c - %m%n
log4j.appender.R=org.apache.log4j.RollingFileAppender
log4j.appender.R.File=example.log
log4j.appender.R.MaxFileSize=100KB
log4j.appender.R.MaxBackupIndex=1
log4j.appender.R.layout=org.apache.log4j.PatternLayout
log4j.appender.R.layout.ConversionPattern=%p %t %c - %m%n
log4j.logger.com.foo=WARN

HelloWorld

entity实体类:Person

package com.ifox.hgx.springdata.entities;import org.springframework.format.annotation.DateTimeFormat;import javax.persistence.*;
import java.util.Date;@Table(name = "JPA_PERSONS")
@Entity
public class Person {private Integer id ;private String lastName ;private String email ;private Date birth ;@GeneratedValue(strategy = GenerationType.IDENTITY)@Idpublic Integer getId() {return id;}public void setId(Integer id) {this.id = id;}@Column(name = "LAST_NAME")public String getLastName() {return lastName;}public void setLastName(String lastName) {this.lastName = lastName;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}@DateTimeFormatpublic Date getBirth() {return birth;}public void setBirth(Date birth) {this.birth = birth;}@Overridepublic String toString() {return "Person{" +"id=" + id +", lastName='" + lastName + '\'' +", email='" + email + '\'' +", birth=" + birth +'}';}
}

dao层:PersonRepository

package com.ifox.hgx.springdata.dao;import com.ifox.hgx.springdata.entities.Person;
import org.springframework.data.repository.Repository;public interface PersonRepository extends Repository<Person,Integer> {Person getByLastName(String lastName) ;
}

service层:PersonService

package com.ifox.hgx.springdata.service;import com.ifox.hgx.springdata.dao.PersonRepository;
import com.ifox.hgx.springdata.entities.Person;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;@Service
public class PersonService {@Autowiredprivate PersonRepository personRepository;public Person getByLastName(String lastName) {return personRepository.getByLastName(lastName);}}

测试类:


package com.ifox.hgx.jap.spring;import com.ifox.hgx.springdata.entities.Person;
import com.ifox.hgx.springdata.service.PersonService;
import org.junit.Test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;import javax.sql.DataSource;
import java.sql.Connection;public class SpringDataTest {private ApplicationContext applicationContext = null;private PersonService personService = null;{applicationContext = new ClassPathXmlApplicationContext("applicationContext.xml");personService = applicationContext.getBean(PersonService.class);}@Testpublic void testDataSource() throws Exception {DataSource dataSource = applicationContext.getBean(DataSource.class);Connection connection = dataSource.getConnection();System.out.println(connection);}@Testpublic void testPersonFindByLastName() {Person person = personService.getByLastName("sjsja") ;System.out.println(person);}
}

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Spring Data JPA 2. HelloWorld

Spring Data JPA HelloWorld

使用 Spring Data JPA 进行持久层开发需要的四个步骤：

搭建环境

HelloWorld

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