在Spring中使用自定義注解的本質就是使用Spring 的 AOP編程。

首先創建一個注解@interface

import org.springframework.data.mongodb.core.mapping.Document; import java.lang.annotation.ElementType; import java.lang.annotation.Retention; import java.lang.annotation.RetentionPolicy; import java.lang.annotation.Target;@Target({ElementType.METHOD,ElementType.TYPE}) @Retention(RetentionPolicy.RUNTIME) @Document public @interface Zhangxueliang {String value(); }

編寫一個切面類，獲取注解@Zhangxueliang信息，并對@Zhangxueliang標注的方法進行切面編程

import lombok.extern.slf4j.Slf4j; import org.aspectj.lang.JoinPoint; import org.aspectj.lang.ProceedingJoinPoint; import org.aspectj.lang.annotation.*; import org.aspectj.lang.reflect.MethodSignature; import org.springframework.stereotype.Component; import java.lang.reflect.Method;/*** @ProjectName springbootdemo_src* @ClassName AnnotationAspect* @Desicription TODO* @Author Zhang Xueliang* @Date 2019/5/15 11:23* @Version 1.0**/ @Aspect @Component @Slf4j public class AnnotationAspect {@Pointcut("@annotation(com.zhangxueliang.demo.springbootdemo.annotation.Zhangxueliang)")public void annotationPointCut() {}@Before("annotationPointCut()")public void before(JoinPoint joinPoint){MethodSignature sign = (MethodSignature)joinPoint.getSignature();Method method = sign.getMethod();Zhangxueliang annotation = method.getAnnotation(Zhangxueliang.class);System.out.println("打印："+annotation.value()+" 開始前");}@Around("annotationPointCut()")public Object advice(ProceedingJoinPoint joinPoint){System.out.println("通知之開始");Object resultMsg=null;try {resultMsg=joinPoint.proceed();System.err.println("++++++++"+resultMsg);log.info("==============可以應用于日志打印==============> "+resultMsg.toString());} catch (Throwable e) {e.printStackTrace();}System.out.println("通知之結束");return resultMsg;}@After("annotationPointCut()")public void after() {System.out.println("after方法執行后");} }

測試注解@Zhangxueliang的使用

import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.EnableAspectJAutoProxy; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RestController; import java.util.ArrayList; import java.util.List;/*** @ProjectName springbootdemo_src* @ClassName Test* @Desicription TODO* @Author Zhang Xueliang* @Date 2019/5/15 11:26* @Version 1.0**/ @SpringBootApplication @RestController //@EnableAspectJAutoProxy public class Test {public static void main(String[] args) {SpringApplication.run(Test.class, args);}@RequestMapping("/annotation")@Zhangxueliang("測試注解1")public List<String> getById() {System.err.println("o+++++++++++++++++");List<String> list = new ArrayList<String>();list.add("1");list.add("qwe");list.add("asd");return list;} }

總結

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