JAVA自定义注解

• 自定义注解
• 一、aop切面代码如下

该注解用于前置通知

import java.lang.annotation.documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;


@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@documented
public @interface FunBtnPermissions {
	String value()default"";
}

该注解用于环绕通知

import java.lang.annotation.documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;


@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@documented
public @interface FunPermissions {
	String value()default"";
}

import java.lang.reflect.Method;

import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.com.core.annotation.FunPermissions;
import org.springframework.stereotype.Component;

@Aspect
@Component
public class FunPermissionsAspect {
	
	@Pointcut("@annotation(com.core.annotation.FunPermissions)")
	public void funPermissionscut() {
	}
	@Pointcut("@annotation(com.core.annotation.FunBtnPermissions)")
	public void funBtnPermissionscut() {
	}
	
	@Around("funPermissionscut()")
	public Object around(ProceedingJoinPoint point) {
		Signature signature = point.getSignature();
        MethodSignature methodSignature = (MethodSignature) signature;
        Method method = methodSignature.getMethod();
        if (method != null){
        	FunPermissions annotation = method.getAnnotation(FunPermissions.class);
        	//获取注解中向value赋的值
        	String value = annotation.value();
        	//获取方法上的参数名称数组
            String[] parameters =  methodSignature.getParameterNames();
            //获取方法上的参数值数组
            Object[] parameterVals = point.getArgs();
            if(判断是否让加@FunPermissions注解的方法继续执行){
            	try {
            		//这个return的时候加@FunPermissions注解的方法继续执行
    				return point.proceed();
    			} catch (Throwable e) {
    				e.printStackTrace();
    			}
            }
        }
        //这个return的时候加@FunPermissions注解的方法停止执行
        return null;
	}
	@Before("funBtnPermissionscut()")
	public void before(JoinPoint point) {
		Signature signature = point.getSignature();
		MethodSignature methodSignature = (MethodSignature) signature;
		Method method = methodSignature.getMethod();
		if (method != null){
		//写业务
	}	
}

结束