Aop切面编程

应用场景: 判断接口是否缓存,业务添加操作日志等
1.添加核心依赖

<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-aspects</artifactId>
</dependency>

2.添加注解

import java.lang.annotation.*;

/**
 * 自定义权限认证注解
 */
@Target({ElementType.PARAMETER, ElementType.METHOD})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface CheckPreAuthorize {
}

3.配置切面类,@Pointcut指定切点,pointcut同理

import org.aspectj.lang.annotation.*;
import org.springframework.stereotype.Component;

/**
 * 权限管理Aop切面
 */
@Aspect
@Component
public class PreAuthorizeAspect {

    /**
     * 添加切入点
     */
    @Pointcut("@annotation(vip.hblg.iot.annotation.CheckPreAuthorize)")
    public void checkPreAuthorize() {
    }

    /**
     * 之前操作
     */
    @Before("checkPreAuthorize()")
    public void check() {
        System.out.println("经过之前验证");
    }

    /**
     * 之后操作
     */
    @After("checkPreAuthorize()")
    public void check2() {
        System.out.println("经过之后验证");
    }

    /**
     * 处理完请求后执行
     */
    @AfterReturning(pointcut = "@annotation(vip.hblg.iot.annotation.CheckPreAuthorize)")
    public void doAfterReturning() {
        System.out.println("处理之后");
    }

    /**
     * 拦截异常操作
     */
    @AfterThrowing(value = "@annotation(vip.hblg.iot.annotation.CheckPreAuthorize)")
    public void doAfterThrowing() {
        System.out.println("处理发生异常时");
    }
}

4.在方法上使用

	@CheckPreAuthorize
    @GetMapping("findAllEntityList")
    public List<Entity> findAllEntityList() {
        return entityService.findAllEntityList();
    }

5.执行顺序

	经过之前验证
	处理之后
	经过之后验证