SpringBoot利用自定义注解实现多数据源

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-aop</artifactId>
</dependency>

public enum DataSourceType {
    Mysql_DATASOURCE1,
    mysql_DATASOURCE2,
}

@Component
@Primary
public class DataSourceManagement extends AbstractRoutingDataSource {

    public static ThreadLocal<String> flag = new ThreadLocal<>();

    
    @Resource
    private DataSource mysqlDataSource1;
    
    @Resource
    private DataSource mysqlDataSource2;

    public DataSourceManagement() {
        flag.set(DataSourceType.MYSQL_DATASOURCE1.name());
    }

    @Override
    protected Object determineCurrentLookupKey() {
        return flag.get();
    }

    @Override
    public void afterPropertiesSet() {
        Map<Object, Object> targetDataSource = new ConcurrentHashMap<>();
        targetDataSource.put(DataSourceType.MYSQL_DATASOURCE1.name(), mysqlDataSource1);
        targetDataSource.put(DataSourceType.MYSQL_DATASOURCE2.name(), mysqlDataSource2);
        // 设置数据源来源
        super.setTargetDataSources(targetDataSource);
        // 设置默认数据源
        super.setDefaultTargetDataSource(mysqlDataSource1);
        super.afterPropertiesSet();
    }
}

@Target({ElementType.TYPE,ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface TargetDataSource {
    DataSourceType value() default DataSourceType.MYSQL_DATASOURCE1;
}

@Component
@Aspect
@Slf4j
@Order(Ordered.LOWEST_PRECEDENCE-1) // Bean加载顺序
public class TargetDataSourceAspect {

    @Around("@within(TargetDataSource) || @annotation(TargetDataSource)")
    public Object beforeNoticeUpdateDataSource(ProceedingJoinPoint joinPoint) {
        TargetDataSource annotation = null;
        Class<? extends Object> target = joinPoint.getTarget().getClass();
        if (target.isAnnotationPresent(TargetDataSource.class)) {
            // 判断类上是否标注着注解
            annotation = target.getAnnotation(TargetDataSource.class);
            log.info("类上标注了注解");
        } else {
            Method method = ((MethodSignature) joinPoint.getSignature()).getMethod();
            if (method.isAnnotationPresent(TargetDataSource.class)) {
                // 判断方法上是否标注着注解，如果类和方法上都没有标注，则报错
                annotation = method.getAnnotation(TargetDataSource.class);
                log.info("方法上标注了注解");
            } else {
                throw new RuntimeException("@TargetDataSource注解只能用于类或者方法上, 错误出现在:[" +
                        target.toString() + " " + method.toString() + "];");
            }
        }
        // 切换数据源
        DataSourceManagement.flag.set(annotation.value().name());
        Object result = null;
        try {
            // 执行目标代码
            result = joinPoint.proceed();
        } catch (Throwable e) {
            e.printStackTrace();
        }
        return result;
    }
}

import look.Word.datasource.service.BookService;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import javax.annotation.Resource;


@SpringBootTest
public class TestBookMapper {
    @Resource
    private BookService bookService;
    @Test
    void updatePrice() {
        System.out.println(bookService.updatePrice(1, 777));
    }
}