自定义注解+面向切面 日志记录

自定义注解

package com.example.spring.controller;
​
import java.lang.annotation.*;
​
@Target(value = ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface LogTest {
    String type() default "";
    String name() default "";
}
​

target选择注解可以放在类或者方法上面

retention 什么时候启动注解

切面

@Pointcut 切点，切面什么时候可以切入（切入什么方法）

@Around 环绕加强，有助于对操作前后都操作，必须加上process方法，否则业务代码无法运行

@After 业务跑完之后运行

@AfterThrow 跑完如果抛异常会运行

@AfterReturning（若目标方法无异常，执行@AfterReturning注解方法的业务逻辑）

简单实现

package com.example.spring.controller;
​
import jdk.nashorn.internal.runtime.logging.Logger;
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 org.springframework.web.context.request.RequestContextHolder;
import org.springframework.web.context.request.ServletRequestAttributes;
​
import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.Method;
​
@Component
@Aspect
@Logger
public class AopTest {
​
    @Pointcut("@annotation(com.example.spring.controller.LogTest)")
    public void log(){}
​
    @Around("log()")
    public Object around(ProceedingJoinPoint joinPoint) throws Throwable {
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        Method method = signature.getMethod();
        String name = signature.getName();
        LogTest logTest = signature.getMethod().getAnnotation(LogTest.class);
        String name1 = logTest.name();
        String type = logTest.type();
        System.out.println("method:"+method);
        System.out.println("name:"+name);
        System.out.println("name1:"+name1);
        System.out.println("type:"+type);
        return joinPoint.proceed();
    }
    @Before("log()")
    public void before(JoinPoint joinPoint){
        ServletRequestAttributes signature = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = signature.getRequest();
        String ip = request.getRemoteHost();
        String remoteUser = request.getRemoteUser();
        System.out.println("ip:"+ip);
        System.out.println("user"+remoteUser);
    }
​
    @After("log()")
    public void after(JoinPoint point){
        System.out.println("跑完了");
    }
​
​
    @AfterThrowing("log()")
    public void after1(JoinPoint joinPoint){
        System.out.println("baocuole");
    }
}
​