SpringBoot 自定义注解实现过程

1、新建SpringBoot-Test

 其中pom.xml 文件如下:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.6.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>org.example</groupId>
    <artifactId>SpringBoot-Test</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjrt</artifactId>
        </dependency>
        <dependency>
            <groupId>org.aspectj</groupId>
            <artifactId>aspectjweaver</artifactId>
        </dependency>
        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <version>4.12</version>
        </dependency>
    </dependencies>
</project>

2、设置启动端口：

3、自定义注解 MyAnotion

package com.springboot.annotation;

import java.lang.annotation.*;

@Target(ElementType.METHOD)//注解实现位置
@Retention(RetentionPolicy.RUNTIME)//元注解 运行时生效
@Documented
@Inherited
public @interface MyAnotion {
    String operation() default "";
}

4、自定义切面 MyAnnotationAspect

package com.springboot.aop;

import org.aspectj.lang.ProceedingJoinPoint;
import org.aspectj.lang.annotation.Around;
import org.aspectj.lang.annotation.Aspect;
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;

@Aspect //声明为切面类
@Component //扫描到容器中
public class MyAnnotationAspect {
    @Around(value = "@annotation(com.springboot.annotation.MyAnotion)")
    public Object logAround(ProceedingJoinPoint joinPoint) throws Throwable {
        //方法参数
        Object[] joinPointArgs = joinPoint.getArgs();
        //方法名称 首先获取签名
        MethodSignature signature = (MethodSignature)joinPoint.getSignature();
        Method method = signature.getMethod();
        String methodName = method.toString();
        //获取方法上的注解
        //获取ip地址
        ServletRequestAttributes requestAttributes =
                (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
        HttpServletRequest request = requestAttributes.getRequest();
        String ip = request.getRemoteAddr();
        //获取方法执行时间
        System.out.println("=======请求前=======");
        //执行方法
        joinPoint.proceed();
        System.out.println("=======请求后=======");
        return null;
    }
}

5、编写测试TestController,加上自定义注解 MyAnotion

package com.springboot.controller;

import com.springboot.annotation.MyAnotion;
import org.junit.Test;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping(value = "test")
public class TestController {
    @Test
    @MyAnotion
    @RequestMapping(value = "/demo")
    public void Demo(){
        System.out.println("请求成功!");
    }
}

6、编写测试接口 MyTestHttp.http

7、验证测试结果：

上边就是简单的SpringBoot中自定义注解的实现过程：

其中代码结构为：