1. 目录结构及配置
pom.xml(不要乱放太多，会引起jar冲突，亲身体验)
<?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.luoshupeng</groupId>
<artifactId>multidatasource</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>SpringBoot2-MultiDataSource</name>
<description>Spring Boot 2.0 多数据源练习程序</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.0.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>2. 配置文件
server.port=8080
##\u7B2C\u4E00\u79CD\u65B9\u6CD5
spring.datasource.primary.name=primaryDB
spring.datasource.primary.url=jdbc:mysql://localhost:3306/shiro?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&useSSL=true
spring.datasource.primary.username=root
spring.datasource.primary.password=
spring.datasource.primary.driver-class-name=com.mysql.jdbc.Driver
##\u7B2C\u4E8C\u79CD\u65B9\u6CD5
spring.datasource.secondary.name=secondaryDB
#spring.datasource.secondary.url=jdbc:h2:mem:test-db2
spring.datasource.secondary.jdbc-url=jdbc:mysql://localhost:3306/test?useUnicode=true&characterEncoding=utf-8&serverTimezone=UTC&useSSL=true
spring.datasource.secondary.username=root
spring.datasource.secondary.password=
spring.datasource.secondary.driver-class-name=com.mysql.jdbc.Driver
spring.jpa.hibernate.ddl-auto=create-drop
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.hbm2ddl.auto=update
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect3. DataSourceConfigurer类
（两种方法，取任何一种都可以，此程序中两种都有demo）
@Configuration
public class DataSourceConfigurer {
@Primary
@Bean(name = "primaryDataSourceProperties")
@ConfigurationProperties(prefix = "spring.datasource.primary")
public DataSourceProperties primaryDataSourceProperties() {
return new DataSourceProperties();
}
@Primary
@Bean(name = "primaryDataSource")
@ConfigurationProperties(prefix = "spring.datasource.primary")
public DataSource primaryDataSource() {
return primaryDataSourceProperties().initializeDataSourceBuilder().build();
}
@Bean(name = "secondaryDataSource")
@ConfigurationProperties(prefix = "spring.datasource.secondary")
public DataSource secondaryDataSource() {
return DataSourceBuilder.create().build();
}
}4. 主数据源配置
（需要改两处，1.注解处basePackages=“****”//此处对应程序dao层 全路径包名，2. LocalContainerEntityManagerFactoryBean方法下的.packeages(“***”)//pojo类全类名）
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = "entityManagerFactoryPrimary",
transactionManagerRef = "transactionManagerPrimary",
basePackages = {"com.luoshupeng.multidatasource.primary"})
public class PrimaryConfigurer {
@Resource(name = "primaryDataSource")
private DataSource primaryDataSource;
@Autowired
private JpaProperties jpaProperties;
private Map<String, Object> getVendorProperties() {
return jpaProperties.getHibernateProperties(new HibernateSettings());
}
@Primary
@Bean(name = "entityManagerFactoryPrimary")
public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) {
return builder.dataSource(primaryDataSource).properties(getVendorProperties())
.packages("com.luoshupeng.multidatasource.primary").persistenceUnit("primaryPersistenceUnit")
.build();
}
@Primary
@Bean(name = "entityManagerPrimary")
public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
}
@Primary
@Bean(name = "transactionManagerPrimary")
public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
}
}5. 从数据源配置
（需要改两处，1.注解处basePackages=“****”//此处对应程序dao层 全路径包名，2. LocalContainerEntityManagerFactoryBean方法下的.packeages(“***”)//pojo类全类名）
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
transactionManagerRef = "transactionManagerSecondary",
entityManagerFactoryRef = "entityManagerFactorySecondary",
basePackages = {"com.luoshupeng.multidatasource.secondary.repository"})
public class SecondaryConfigurer {
//@Resource(name = "secondaryDataSource")
@Autowired
@Qualifier(value = "secondaryDataSource")
private DataSource secondaryDataSource;
@Autowired
private JpaProperties jpaProperties;
private Map<String, Object> getVendorProperties() {
return jpaProperties.getHibernateProperties(new HibernateSettings());
}
@Bean(name = "entityManagerFactorySecondary")
public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary(EntityManagerFactoryBuilder builder) {
return builder.dataSource(secondaryDataSource).properties(getVendorProperties())
.packages("com.luoshupeng.multidatasource.secondary.repository").persistenceUnit("secondaryPersistenceUnit")
.build();
}
@Bean(name = "entityManagerSecondary")
public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
return entityManagerFactorySecondary(builder).getObject().createEntityManager();
}
@Bean(name = "transactionManagerSecondary")
public PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
}
}6.User实体类模板
package com.luoshupeng.multidatasource.primary.entity;
import javax.persistence.*;
@Entity
@Table(name = "user")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private Integer id;
private String name;
private Integer age;
public User() {
}
public User(String name, Integer age) {
this.name = name;
this.age = age;
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Integer getAge() {
return age;
}
public void setAge(Integer age) {
this.age = age;
}
@Override
public String toString() {
return "User{" +
"id=" + id +
", name='" + name + '\'' +
", age=" + age +
'}';
}
}7.dao层模板
//注意！！必须继承JpaRepository
import com.luoshupeng.multidatasource.primary.entity.User;
import org.springframework.data.jpa.repository.JpaRepository;
import java.util.List;
public interface UserRepository extends JpaRepository<User, Integer> {
List<User> findAll();
}
8.service模板
import com.luoshupeng.multidatasource.primary.entity.User;
import com.luoshupeng.multidatasource.primary.repository.UserRepository;
import com.luoshupeng.multidatasource.baseservice.IBaseService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.util.List;
@Service
public class UserService implements IBaseService<User> {
@Autowired
UserRepository userRepository;
@Override
public List<User> list() {
return userRepository.findAll();
}
}
9.IBaseService接口
import java.util.List;
public interface IBaseService<T> {
List<T> list();
}
以上为个人经验，希望能给大家一个参考，也希望大家多多支持编程网。
