1.导包
<?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>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.4.RELEASE</version>
</parent>
<groupId>com.xiaobin</groupId>
<artifactId>mysql_master_slave</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<java.version>1.8</java.version>
<lombok.version>1.18.6</lombok.version>
<mybatis.version>1.3.2</mybatis.version>
<lombox.version>1.18.6</lombox.version>
</properties>
<dependencies>
<!-- 添加web启动座标 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- 添加lombok工具座标 -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
</dependency>
<!-- 添加springboot 测试座标 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
</dependency>
<!-- 添加lombox 测试座标 -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombox.version}</version>
</dependency>
<!-- 添加mybatis依赖座标 -->
<dependency>
<groupId>org.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
<version>${mybatis.version}</version>
</dependency>
<!-- 添加mysql驱动器座标 -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<!-- 添加druid数据源座标 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<!-- 添加AOP座标 -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
</dependencies>
</project>
2.application.yml配置
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
druid:
master:
driverClassName: com.mysql.jdbc.Driver
username: root
password: root
url: jdbc:mysql://localhost:3306/master?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8
slave:
enable: false
driverClassName: com.mysql.jdbc.Driver
username: root
password: root
url: jdbc:mysql://localhost:3306/slave?serverTimezone=GMT%2B8&useUnicode=true&characterEncoding=utf8
3.配置多数据源类
package com.hjl.config;
import java.util.HashMap;
import java.util.Map;
import javax.sql.DataSource;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import com.alibaba.druid.spring.boot.autoconfigure.DruidDataSourceBuilder;
import com.myproj.common.enums.DataSourceType;
import com.myproj.framework.datasource.DynamicDataSource;
/**
* druid 配置多数据源
*
* @author hjl
*/
@Configuration
public class DruidConfig {
@Bean
@ConfigurationProperties("spring.datasource.druid.master")
public DataSource masterDataSource() {
return DruidDataSourceBuilder.create().build();
}
@Bean
@ConfigurationProperties("spring.datasource.druid.slave")
//配置为中的spring.datasource.druid.slave.enable=true才加载
@ConditionalOnProperty(prefix = "spring.datasource.druid.slave" , name = "enabled" , havingValue = "true")
public DataSource slaveDataSource() {
return DruidDataSourceBuilder.create().build();
}
@Bean(name = "dynamicDataSource")
@Primary
public DynamicDataSource dataSource(DataSource masterDataSource, DataSource slaveDataSource) {
Map<Object, Object> targetDataSources = new HashMap<>();
targetDataSources.put(DataSourceType.MASTER.name(), masterDataSource);
targetDataSources.put(DataSourceType.SLAVE.name(), slaveDataSource);
return new DynamicDataSource(masterDataSource, targetDataSources);
}
}
4.动态数据源切换类
public class DynamicDataSource extends AbstractRoutingDataSource {
private static final ThreadLocal<String> contextHolder = new ThreadLocal<>();
public DynamicDataSource(DataSource defaultTargetDataSource, Map<Object, Object> targetDataSources) {
super.setDefaultTargetDataSource(defaultTargetDataSource);
super.setTargetDataSources(targetDataSources);
super.afterPropertiesSet();
}
@Override
protected Object determineCurrentLookupKey() {
return getDataSource();
}
public static void setDataSource(String dataSource) {
contextHolder.set(dataSource);
}
public static String getDataSource() {
return contextHolder.get();
}
public static void clearDataSource() {
contextHolder.remove();
}
}
5.自定义注解类
package com.hjl.annotation;
import java.lang.annotation.*;
@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface DataSource {
String name() default "";
}
6.AOP切面类,用于判断切换数据源
@Aspect
@Order(1)
@Component
public class DataSourceAspect {
@Pointcut("@annotation(com.hjl.annotation.DataSource)")
public void dataSourcePointCut() {
}
@Around("dataSourcePointCut()")
public Object around(ProceedingJoinPoint point) throws Throwable {
MethodSignature signature = (MethodSignature) point.getSignature();
Method method = signature.getMethod();
//判断方法上是否有@DataSource注解,如果有就走master数据源
DataSource dataSource = method.getAnnotation(DataSource.class);
if(dataSource == null){
DynamicDataSource.setDataSource("master");
}else {
DynamicDataSource.setDataSource(dataSource.name());
}
try {
return point.proceed();
} finally {
DynamicDataSource.clearDataSource();
}
}
}
7.main启动类
@SpringBootApplication(exclude= {DataSourceAutoConfiguration.class})
@MapperScan(basePackages = "com.hjl.mapper")
public class StartApp {
public static void main(String[] args) {
SpringApplication.run(StartApp.class);
}
}