本文介绍如何集成SpringDataJpa与Spring技术构建智能销售系统，重点讲解配置步骤及自定义Repository实现高级查询功能。
智能销售系统技术心得
第一章
集成SpringDataJpa+Spring 技术
什么是SpringDataJpa
其实就是Spring对JPA的 封装使用，底层是通过hibernate对JPA的实现来完成的，使我们操作数据库变得更加加单方便，配置相对较多
配置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>cn.itsource</groupId>
<artifactId>aisell</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<org.springframework.version>4.2.5.RELEASE</org.springframework.version>
<org.hibernate.version>4.3.8.Final</org.hibernate.version>
<spring-data-jpa.version>1.9.0.RELEASE</spring-data-jpa.version>
<com.fasterxml.jackson.version>2.5.0</com.fasterxml.jackson.version>
<org.slf4j.version>1.6.1</org.slf4j.version>
</properties>
<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>
<!--上下文支持包:支持以后Spring的邮件发送,定时器,模板-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>${org.springframework.version}</version>
</dependency>
<!--事务-->
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>${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>
<!--代表测试只能在test包中使用-->
<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>
<!-- SpringMVC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>
<!--hibernate对于jpa的支持包-->
<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>
<!-- SpringDataJPA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>
<!-- easypoi的支持 -->
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-base</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-web</artifactId>
<version>3.2.0</version>
</dependency>
<dependency>
<groupId>cn.afterturn</groupId>
<artifactId>easypoi-annotation</artifactId>
<version>3.2.0</version>
</dependency>
<!-- JSR 303 规范验证包 -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-validator</artifactId>
<version>5.2.4.Final</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>
<build>
<finalName>aisell</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<groupId>org.mortbay.jetty</groupId>
<artifactId>jetty-maven-plugin</artifactId>
<version>8.1.15.v20140411</version>
<configuration>
<stopPort>9966</stopPort>
<stopKey>foo</stopKey>
<webAppConfig>
<contextPath>/</contextPath>
</webAppConfig>
</configuration>
</plugin>
</plugins>
</build>
</project>
配置applicationContext.xml文件
<?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">
<!-- 扫描service部分的包 -->
<context:component-scan base-package="cn.itsource.aisell.service" />
<context:property-placeholder location="classpath:jdbc.properties" />
<!-- 配置连接池 -->
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<!--连接数据4个属性 -->
<property name="driverClassName" value="${jdbc.driverClassName}" />
<property name="url" value="${jdbc.url}" />
<property name="username" value="${jdbc.username}" />
<property name="password" value="${jdbc.password}" />
<!--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>
<!-- 集成hibernate的jpa功能 -->
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<!--待扫描的实体类包，不再需要persistence.xml了 -->
<property name="packagesToScan" value="cn.itsource.aisell.domain" />
<!-- 3.配置JPA的实现 -->
<!-- private JpaVendorAdapter jpaVendorAdapter; -->
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<!-- org.springframework.orm.jpa.vendor.AbstractJpaVendorAdapter -->
<!-- private boolean showSql = false;是否显示sql语句 -->
<property name="showSql" value="true" />
<!-- private boolean generateDdl = false;是否建表 -->
<property name="generateDdl" value="false" />
<!-- private String databasePlatform;原来方言 -->
<property name="databasePlatform" value="org.hibernate.dialect.MySQLDialect" />
</bean>
</property>
</bean>
<!-- Jpa 事务配置 -->
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactory" />
</bean>
<!-- 注解声明式事务管理 -->
<tx:annotation-driven />
<!-- Spring Data Jpa配置 ********************************************-->
<!-- base-package:扫描的包 -->
<jpa:repositories base-package="cn.itsource.pss.repository" transaction-manager-ref="transactionManager"
entity-manager-factory-ref="entityManagerFactory" />
</beans>
配置完之后就可以开始创建domain了，然后相应的是repository，service，controller，query等包
完成相应的CRUD，然后开始写高级查询功能
/**
* 自定义一个Repository,它是JpaRepository的功能基础上继承增强
* 在上面添加@NoRepositoryBean标注，这样Spring Data Jpa在启动时就不会去实例化BaseRepository这个接口
* @param <T>
* @param <ID>
*/
@NoRepositoryBean
public interface BaseRepository<T,ID extends Serializable> extends JpaRepository<T,ID>, JpaSpecificationExecutor<T> {
//根据Query拿到分页对象(分页)
Page findPageByQuery(BaseQuery baseQuery);
//根据Query拿到对应的所有数据(不分页)
List<T> findByQuery(BaseQuery baseQuery);
//根据jpql与对应的参数拿到数据
List findByJpql(String jpql,Object... values);
}
JpaSpecification Executor
JpaSpecificationExecutor(JPA规则执行者)是JPA2.0提供的Criteria API的使用封装，可以用于动态生成Query来满足我们业务中的各种复杂场景。
Spring Data JPA为我们提供了JpaSpecificationExecutor接口，只要简单实现toPredicate方法就可以实现复杂的查询。
package org.springframework.data.jpa.repository;
import java.util.List;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.domain.Specification;
public interface JpaSpecificationExecutor<T> {
T findOne(Specification<T> spec);
List<T> findAll(Specification<T> spec);
Page<T> findAll(Specification<T> spec, Pageable pageable);
List<T> findAll(Specification<T> spec, Sort sort);
long count(Specification<T> spec);
}
但是很难使用，所以我这里使用了一个插件
https://github.com/wenhao/jpa-spec
<!-- jpa的SpecificationSpecification功能封装 -->
<dependency>
<groupId>com.github.wenhao</groupId>
<artifactId>jpa-spec</artifactId>
<version>3.1.1</version>
<!-- 把所有依赖都过滤 -->
<exclusions>
<exclusion>
<groupId>*</groupId>
<artifactId>*</artifactId>
</exclusion>
</exclusions>
</dependency>
然后就可以愉快的
Specification<Employee> spec = Specifications.<Employee>and()
.like("username", "%1%")
。。。。一直在这儿追加高级查询就行了
.build();
可以使用插件之后我们就可以抽一个公共的查询父类出来，以后子类都继承他就行了，里面完成了分页和排序的功能，子类只用写自己的高级查询条件就行了
package cn.itsource.aisell.query;
import org.apache.commons.lang3.StringUtils;
import org.springframework.data.domain.Sort;
import org.springframework.data.jpa.domain.Specification;
//抽象方法类名上也要加abstract
public abstract class BaseQuery {
//注意这里使用int类型，包装类以后可能会判断是否为空，int只判断是否为0
private int currentPage = 1;
private int pageSize = 10;
//规范子类必须继承父类的查询的方法
public abstract Specification createSpec();
private Boolean orderByType = true;
private String orderByName;
public Sort createSort(){
if (StringUtils.isNotBlank(orderByName)){
//new Sort方法，要传两个参数
Sort sort = new Sort(orderByType?Sort.Direction.ASC: Sort.Direction.DESC,orderByName);
return sort;
}
return null;
}
public Boolean getOrderByType() {
return orderByType;
}
public void setOrderByType(Boolean orderByType) {
this.orderByType = orderByType;
}
public String getOrderByName() {
return orderByName;
}
public void setOrderByName(String orderByName) {
this.orderByName = orderByName;
}
public int getCurrentPage() {
return currentPage;
}
//只用给我们自己使用的获取当前页的方法，用户的是从1开始的，我们的是从0开始的
public int getJpaPage() {
return currentPage-1;
}
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
public int getPageSize() {
return pageSize;
}
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
}
public void setPage(int page){
this.currentPage=page;
}
public void setRows(int rows){
this.pageSize=rows;
}
}
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