SpringBoot实现AOP切面，aspect中获取注解

引入pom

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<dependency>     <groupId>org.springframework.boot</groupId>     <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency>     <groupId>org.springframework.boot</groupId>     <artifactId>spring-boot-starter-aop</artifactId>     <version>2.6.1</version> </dependency> <dependency>     <groupId>org.aspectj</groupId>     <artifactId>aspectjweaver</artifactId>     <version>1.9.7</version>     <scope>runtime</scope> </dependency> <dependency>     <groupId>aspectj</groupId>     <artifactId>aspectjrt</artifactId>     <version>1.5.4</version> </dependency>

　　新建AOP类

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package com.geebox.wmstest.config;   import org.aspectj.lang.JoinPoint; import org.aspectj.lang.annotation.AfterReturning; import org.aspectj.lang.annotation.Aspect; import org.aspectj.lang.annotation.Before; import org.aspectj.lang.annotation.Pointcut; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.stereotype.Component; import org.springframework.web.context.request.RequestContextHolder; import org.springframework.web.context.request.ServletRequestAttributes;   import javax.servlet.http.HttpServletRequest; import java.util.Arrays;   @Aspect @Component public class WebLogAcpect {     private Logger logger = LoggerFactory.getLogger(WebLogAcpect.class);     /**      * 定义切入点      */     @Pointcut("execution(public * com.geebox.wmstest.controller..*.*(..))")     public void webLog(){}       /**      * 前置通知：在连接点之前执行的通知      * @param joinPoint      * @throws Throwable      */     @Before("webLog()")     public void doBefore(JoinPoint joinPoint) throws Throwable {         // 接收到请求，记录请求内容         ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();         HttpServletRequest request = attributes.getRequest();         // 记录下请求内容         logger.info("URL : " + request.getRequestURL().toString());         logger.info("HTTP_METHOD : " + request.getMethod());         logger.info("IP : " + request.getRemoteAddr());         logger.info("CLASS_METHOD : " + joinPoint.getSignature().getDeclaringTypeName() + "." + joinPoint.getSignature().getName());         logger.info("ARGS : " + Arrays.toString(joinPoint.getArgs()));     }     @AfterReturning(returning = "ret",pointcut = "webLog()")     public void doAfterReturning(Object ret) throws Throwable {         // 处理完请求，返回内容         logger.info("RESPONSE : " + ret);     } }

来源：https://blog.csdn.net/lmb55/article/details/82470388/

常见的切面表达式
1 所有公有方法的执行
execution(public * *(..))
2 所有以set开头的公有方法的执行
execution(* set*(..))
3 AccountService接口下的所有方法的执行
execution(* com.xyz.service.AccountService.*(..))
4 com.xyz.service包下的所有方法的执行
execution(* com.xyz.service.*.*(..))
5 com.xyz.service包及其子包下的所有方法的执行
execution(* com.xyz.service..*.*(..))
6 匹配com.xyz.service包下的所有类的所有方法（不含子包）
within(com.xyz.service.*)
7 com.xyz.service包和子包的所有方法
within(com.xyz.service..*)
8 匹配AccountService的代理类（不支持通配符）
this(com.xyz.service.AccountService)
官方文档
https://docs.spring.io/spring/docs/4.2.5.RELEASE/spring-framework-reference/html/aop.html#aop-schema

aspect中获取注解

//获取方法上面的注解
MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature();
String dsKey = methodSignature.getMethod().getAnnotation(DS.class).value();

切入函数中获取注解

    @Around("pointcut() && @annotation(ds)")
    public Object around(ProceedingJoinPoint joinPoint, DS ds) throws Throwable {
        //数据源名称
        String dsKey = ds.value();
        DynamicDataSourceContextHolder.setContextKey(dsKey);
        try {
            return joinPoint.proceed();
        } finally {
            DynamicDataSourceContextHolder.removeContextKey();
        }
    }

//Service方法上的注解：ds.value();
//Service方法上的注解：((MethodSignature) joinPoint.getSignature()).getMethod().getAnnotation(DS.class).value();
//Service类上的注解：joinPoint.getTarget().getClass().getAnnotation(DS.class).value()