SpringDataJpa
前言：
它是JPA规范的再次封装抽象，底层还是使用了Hibernate的JPA技术实现，引用JPQL的查询语句 ，是属于Spring的生成体系中的一部分。
SpringDataJpa使用起来比较方便，加快了开发的速度，使开发人员不需要关心和配置更多的东西。
SpringDataJpa上手简单，开发效率高，对对象的支持非常好，还十分的灵活。
使用方法(开发工具：idea):
1、导包 pom.xml配置
${org.springframework.version}:这是为了统一更换同种类型的包
有些包是多余的，
1、 <dependencies>
<!-- Spring的支持包 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-orm</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-test</artifactId>
<version>${org.springframework.version}</version>
<scope>test</scope>
</dependency>
<!-- 引入web前端的支持 -->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<!-- SpringMCV上传需要用到io包-->
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-io</artifactId>
<version>1.3.2</version>
</dependency>
<!-- 文件上传用到的包 -->
<dependency>
<groupId>commons-fileupload</groupId>
<artifactId>commons-fileupload</artifactId>
<version>1.2.2</version>
</dependency>
<!-- SpringMVC的json支持包 -->
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>${com.fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>${com.fasterxml.jackson.version}</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>${com.fasterxml.jackson.version}</version>
</dependency>
<!-- hibernate的支持包 -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${org.hibernate.version}</version>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>${org.hibernate.version}</version>
</dependency>
<!-- SpringData的支持包 -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>${spring-data-jpa.version}</version>
</dependency>
<!-- SpringData的擴展包 -->
<dependency>
<groupId>com.github.wenhao</groupId>
<artifactId>jpa-spec</artifactId>
<version>3.1.1</version>
<!-- 把所有的依賴都去掉 -->
<exclusions>
<exclusion>
<groupId>*</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>commons-dbcp</groupId>
<artifactId>commons-dbcp</artifactId>
<version>1.2.2</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.6</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.5</version>
</dependency>
<!-- 測試包 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.12</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<!-- 这个scope 只能作用在编译和测试时，同时没有传递性。表示在运行的时候不添加此jar文件 -->
<scope>provided</scope>
</dependency>
<!-- 日志文件 -->
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${org.slf4j.version}</version>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>${org.slf4j.version}</version>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.14</version>
</dependency>
<!-- 代码生成器模版技术 -->
<dependency>
<groupId>org.apache.velocity</groupId>
<artifactId>velocity</artifactId>
<version>1.6</version>
</dependency>
<!-- shiro的支持包 -->
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-all</artifactId>
<version>1.4.0</version>
<type>pom</type>
</dependency>
<!-- shiro与Spring的集成包 -->
<dependency>
<groupId>org.apache.shiro</groupId>
<artifactId>shiro-spring</artifactId>
<version>1.4.0</version>
</dependency>
<!-- poi支持的jar包 -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.11</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.11</version>
</dependency>
<!-- 图片压缩功能 -->
<!-- 缩略图 -->
<dependency>
<groupId>net.coobird</groupId>
<artifactId>thumbnailator</artifactId>
<version>0.4.6</version>
</dependency>
<!-- 定时调度 -->
<dependency>
<groupId>quartz</groupId>
<artifactId>quartz</artifactId>
<version>1.5.2</version>
</dependency>
<!-- 邮件支持 -->
<dependency>
<groupId>javax.mail</groupId>
<artifactId>mail</artifactId>
<version>1.4.1</version>
</dependency>
</dependencies>
2、SpringDataJpa基本配置，配置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 "> <!--加载properties文件--> <context:property-placeholder location="classpath:jdbc.properties"/> <!--配置连接池--> <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close"> <property name="driverClassName" value="${jdbc.driverClassName}"></property> <property name="url" value="${jdbc.url}"></property> <property name="username" value="${jdbc.username}"></property> <property name="password" value="${jdbc.password}"></property> <!--maxActive: 最大连接数量 --> <property name="maxActive" value="150" /> <!--minIdle: 最小空闲连接 --> <property name="minIdle" value="5" /> <!--maxIdle: 最大空闲连接 --> <property name="maxIdle" value="20" /> <!--initialSize: 初始化连接 --> <property name="initialSize" value="30" /> <!-- 用来配置数据库断开后自动连接的 --> <!-- 连接被泄露时是否打印 --> <property name="logAbandoned" value="true" /> <!--removeAbandoned: 是否自动回收超时连接 --> <property name="removeAbandoned" value="true" /> <!--removeAbandonedTimeout: 超时时间(以秒数为单位) --> <property name="removeAbandonedTimeout" value="10" /> <!--maxWait: 超时等待时间以毫秒为单位 1000等于60秒 --> <property name="maxWait" value="1000" /> <!-- 在空闲连接回收器线程运行期间休眠的时间值,以毫秒为单位. --> <property name="timeBetweenEvictionRunsMillis" value="10000" /> <!-- 在每次空闲连接回收器线程(如果有)运行时检查的连接数量 --> <property name="numTestsPerEvictionRun" value="10" /> <!-- 1000 * 60 * 30 连接在池中保持空闲而不被空闲连接回收器线程 --> <property name="minEvictableIdleTimeMillis" value="10000" /> <property name="validationQuery" value="SELECT NOW() FROM DUAL" /> </bean> <!--配置entityManagerFactory--> <bean id="myEmf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <!--注入dataSource--> <property name="dataSource" ref="dataSource"/> <!--配置扫描的包,只认识jpa的注解--> <property name="packagesToScan" value="cn.king.aisell.domain"/> <!--配置jpa的实现--> <property name="jpaVendorAdapter"> <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <!--是否显示SQL--> <property name="showSql" value="true"/> <!--建表策略--> <property name="generateDdl" value="false"/> <!--方言--> <property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect"/> </bean> </property> </bean> <!--配置事务--> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="myEmf"/> </bean> <!--开启事务管理 transaction-manager="transactionManager"可以不写，默认transactionManager--> <tx:annotation-driven transaction-manager="transactionManager"/> <!--配置扫描--> <context:component-scan base-package="cn.king.aisell.service"/> <!--配置springDataJpa扫描--> <jpa:repositories base-package="cn.king.aisell.repository" transaction-manager-ref="transactionManager" entity-manager-factory-ref="myEmf"/> </beans>
3、原来dao层改成repository(命名规范)
4、完成相应的CRUD(继承JpaRepository和JpaSpecificationExecutor)
//JpaRepository<需要操作的domain,与之对应的主键类型> //JpaSpecificationExecutor<需要操作的domain>:让模糊查询和分页相结合 public interface EmployeeRepository extends JpaRepository<Employee,Long> , JpaSpecificationExecutor<Employee> { }
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