使用spring AOP 利用注解判断方法是否需要执行（可以修改入参）_根据参数判断aop增强是否需要执行-优快云博客

本文链接：https://blog.youkuaiyun.com/AGallopingSnail/article/details/104928844

本文介绍如何使用Spring AOP和自定义注解来判断方法是否应该执行，通过Aspect切面编程拦截方法调用，检查注解属性并根据业务逻辑决定方法执行与否。

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首先创建注解：用来标记方法是否需要判断执行

@Target({ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface JudgeMethod{
    String daoName() default "ipDao";
}

在需要判断的是否执行的方法上面加上注解

@JudgeMethod
public String execute(){
// 发送信息
    return sendMsg();
}

利用spring的aop功能实现判断是否执行发送信息方法

@Aspect
@component
public class JudgeMethodAspect implements ApplicationContextAware{

    private ApplicationContext applicationContext;

    @Autowired
    private IpJudgeService ipJudgeService ;

    @Override
    public setApplicationContext(ApplicationContext applicationContext ){
        this.applicationContext = applicationContext;
    } 

    @Pointcut("@annotation(com.wei.annotation.JudgeMethod)")
    public void judgeMethodPointCut(){
    }

    @Around("judgeMethodPointCut()")
    public void around(ProceedingJoinPoint pjp) throws Throwable{
        try{
            String methodName = pjp.getSignature().getName();
            Class<?> targetClass = pjp.getTarget().getClass();
            Class[] parameterTypes = 
            ((MethodSignature)pjp.getsignature()).getParameterTypes();
            Method methodClass = targetClass.getMethod(methodName,parameterTypes):
            JudgeMethod judgeMethod =         
              (JudgeMethod)methodClass.getAnnotation(JudgeMethod.class);
            String ipDaoName = judgeMethod.daoName();
            IpDao ipDao = this.ApplicationContext.getBean(ipDaoName,IpDao.class);
            if(ipJudgeService.JudgeIsExecute(ipDao)){
                pjp.proceed();
            }else{
                 System.out.printlp("不匹配不执行该方法：" + methodName):
            }
        }catch(Exception e){
            System.err.printlp(e):
            throw e;
        }
    }
}

利用spring的aop功能实现打印和修改参数，使用表达式带入注解方法

@Aspect
@component
public class JudgeMethodAspect implements ApplicationContextAware{

    private ApplicationContext applicationContext;

    @Autowired
    private IpJudgeService ipJudgeService ;

    @Override
    public setApplicationContext(ApplicationContext applicationContext ){
        this.applicationContext = applicationContext;
    } 

    @Pointcut("@annotation(com.wei.annotation.JudgeMethod)")
    public void judgeMethodPointCut(){
    }

    @Around("judgeMethodPointCut() && @Annotation(judgeMethod)")
    public void around(ProceedingJoinPoint pjp,JudgeMethod judgeMethod) throws Throwable{
        String servicaIp;
        try{
            String ipDaoName = judgeMethod.daoName();
            IpDao ipDao = this.ApplicationContext.getBean(ipDaoName,IpDao.class);
            if(ipJudgeService.JudgeIsExecute(ipDao)){
                Object[] params = pjp.getArgs();
                for(int i=0;i<params.length;i++){
                    System.out.printlp("参数：" + params[i]):
                }
                pjp.proceed(params);
            }else{
                 System.out.printlp("不匹配不执行该方法：" + methodName):
            }
        }catch(Exception e){
            System.err.printlp(e):
            throw e;
        }
    }
}