SpringAOP方法参数注解 SpringAOP怎样获取方法参数上的注解

/**
* 自定义注解，用于参数
*/
@Target(PARAMETER)
@Documented
@Retention(RetentionPolicy.RUNTIME)
public @interface Test{
}
/**
* 接口层，使用使用@Test注解标记参数
*/
@RestController
@RequestMapping("/v1/test")
public class TestController {
    @PostMapping(value = "/email", produces = "application/json")
    public String send(@RequestBody @Test MailSendDTO mailSendDTO) {
        //TODO 业务处理
        return "SUCCESS";
    }
}

@Aspect
@Configuration
public class ValidateAop {
 
    /**
     * 切点配置，表达式， 在com.laoxi.test.controller包下，所有的类public的任意参数的方法
     */
    @Pointcut("execution(public * com.laoxi.test.controller.*.*(..))")
    public void validate(){}
 
    @Before("validate()")
    public void doBefore(JoinPoint joinPoint){
        Object[] params = joinPoint.getArgs();
        if(params.length == 0){
            return;
        }
        //获取方法，此处可将signature强转为MethodSignature
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
 
        //参数注解，1维是参数，2维是注解
        Annotation[][] annotations = method.getParameterAnnotations();
        for (int i = 0; i < annotations.length; i++) {
            Object param = params[i];
            Annotation[] paramAnn = annotations[i];
            //参数为空，直接下一个参数
            if(param == null || paramAnn.length == 0){
                continue;
            }
            for (Annotation annotation : paramAnn) {
                //这里判断当前注解是否为Test.class
                if(annotation.annotationType().equals(Test.class)){
                    //校验该参数，验证一次退出该注解
                    //TODO 校验参数
                    break;
                }
            }
        }
    }
}

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface Axin {
    /**
     * 所属模块
     * @return
     */
    String module()  default "日志模块";
 
    /**
     * 动作描述
     * @return
     */
    String desc()  default "无动作";
}

/**
 * @author Axin
 */
@Aspect
@Component
public class AxinAspect {
 
    /**
     * 这里定义了一个总的匹配规则，以后拦截的时候直接拦截log()方法即可，无须去重复写execution表达式
     */
    @Pointcut("@annotation(Axin)")
    public void log() {
    }
 
    @Before("log()&&@annotation(axin)")
    public void doBefore(JoinPoint joinPoint,Axin axin) {
        System.out.println("******拦截前的逻辑******");
        System.out.println("目标方法名为:" + joinPoint.getSignature().getName());
        System.out.println("目标方法所属类的简单类名:" + joinPoint.getSignature().getDeclaringType().getSimpleName());
        System.out.println("目标方法所属类的类名:" + joinPoint.getSignature().getDeclaringTypeName());
        System.out.println("目标方法声明类型:" + Modifier.toString(joinPoint.getSignature().getModifiers()));
        //获取传入目标方法的参数
        Object[] args = joinPoint.getArgs();
        for (int i = 0; i < args.length; i++) {
            System.out.println("第" + (i + 1) + "个参数为:" + args[i]);
        }
        System.out.println("被代理的对象:" + joinPoint.getTarget());
        System.out.println("代理对象自己:" + joinPoint.getThis());
 
        System.out.println("拦截的注解的参数：");
        System.out.println(axin.module());
        System.out.println(axin.desc());
    }
 
    @Around("log()&&@annotation(axin)")
    public Object doAround(ProceedingJoinPoint proceedingJoinPoint,Axin axin) throws Throwable {
        System.out.println("环绕通知：");
        System.out.println(axin.module());
        System.out.println(axin.desc());
        Object result = null;
        result = proceedingJoinPoint.proceed();
        return result;
    }
 
    @After("log()")
    public void doAfter() {
        System.out.println("******拦截后的逻辑******");
    }
}

//匹配AOP对象的目标对象为指定类型的方法，即DemoDao的aop的代理对象
@Pointcut("this(com.hhu.DemaoDao)")
public void thisDemo() {
    ...
}

public void doBefore(JoinPoint joinPoint) {
System.out.println("******拦截前的逻辑******");
System.out.println("目标方法名为:" + joinPoint.getSignature().getName());
System.out.println("目标方法所属类的简单类名:" + joinPoint.getSignature().getDeclaringType().getSimpleName());
    System.out.println("目标方法所属类的类名:" + joinPoint.getSignature().getDeclaringTypeName());
    System.out.println("目标方法声明类型:" + Modifier.toString(joinPoint.getSignature().getModifiers()));
    //获取传入目标方法的参数
    Object[] args = joinPoint.getArgs();
    for (int i = 0; i < args.length; i++) {
        System.out.println("第" + (i + 1) + "个参数为:" + args[i]);
    }
    System.out.println("被代理的对象:" + joinPoint.getTarget());
    System.out.println("代理对象自己:" + joinPoint.getThis());
}

//Service接口
public interface AxinService {
    String axinRun(String arg1, User user);
} 
//实现类
/**
 * @author Axin
 */
@Component
public class AxinServiceImpl implements AxinService { 
    @Axin(module = "print",desc = "打印")
    @Override
    public String axinRun(String arg1, User user) {
        String res = arg1 + user.getName() + user.getAge();
        return res;
    }
 
    public String axinRun(String arg1, Person person) {
        String res = arg1 + person.getName() + person.getAge();
        return res;
    }
}
 
//控制类
/**
 * @author Axin
 */
@RestController
public class HelloController {
    @Autowired
    AxinService axinService;
 
    @RequestMapping("/hello")
    public String hello() {
        User user = new User();
        user.setAge(10);
        user.setName("张三");
        String res = axinService.axinRun("Test:", user); 
        return "Hello Spring Boot!<br>"+res;
    }
}