<dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-web</artifactId>
  </dependency>

  <!-- AOP 切面-->
  <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-aop</artifactId>
  </dependency>

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface VisitPermission {
 /**
  * 用于配置具體接口的權(quán)限值
  * 在數(shù)據(jù)庫(kù)中添加對(duì)應(yīng)的記錄
  * 用戶(hù)登錄時(shí)，將用戶(hù)所有的權(quán)限列表放入redis中
  * 用戶(hù)訪問(wèn)接口時(shí)，將對(duì)應(yīng)接口的值和redis中的匹配看是否有訪問(wèn)權(quán)限
  * 用戶(hù)退出登錄時(shí)，清空redis中對(duì)應(yīng)的權(quán)限緩存
  */
 String value() default "";
}

@RestController
@RequestMapping("/permission")
public class PermissionController {
 /**
  * 配置權(quán)限注解 @VisitPermission("permission-test")
  * 只用擁有該權(quán)限的用戶(hù)才能訪問(wèn)，否則提示非法操作
  */
 @VisitPermission("permission-test")
 @GetMapping("/test")
 public String test() {
  System.out.println("================== step 3: doing ==================");
  return "success";
 }
}

@Aspect
@Component
public class PermissionAspect {

 /**
  * 切入點(diǎn)
  * 切入點(diǎn)為包路徑下的：execution(public * org.ylc.note.aop.controller..*(..))：
  * org.ylc.note.aop.Controller包下任意類(lèi)任意返回值的 public 的方法
  * <p>
  * 切入點(diǎn)為注解的： @annotation(VisitPermission)
  * 存在 VisitPermission 注解的方法
  */
 @Pointcut("@annotation(org.ylc.note.aop.annotation.VisitPermission)")
 private void permission() {

 }

 /**
  * 目標(biāo)方法調(diào)用之前執(zhí)行
  */
 @Before("permission()")
 public void doBefore() {
  System.out.println("================== step 2: before ==================");
 }

 /**
  * 目標(biāo)方法調(diào)用之后執(zhí)行
  */
 @After("permission()")
 public void doAfter() {
  System.out.println("================== step 4: after ==================");
 }

 /**
  * 環(huán)繞
  * 會(huì)將目標(biāo)方法封裝起來(lái)
  * 具體驗(yàn)證業(yè)務(wù)數(shù)據(jù)
  */
 @Around("permission()")
 public Object doAround(ProceedingJoinPoint proceedingJoinPoint) throws Throwable {
  System.out.println("================== step 1: around ==================");
  long startTime = System.currentTimeMillis();
  /*
   * 獲取當(dāng)前http請(qǐng)求中的token
   * 解析token :
   * 1、token是否存在
   * 2、token格式是否正確
   * 3、token是否已過(guò)期（解析信息或者redis中是否存在）
   * */
  ServletRequestAttributes attributes = (ServletRequestAttributes) RequestContextHolder.getRequestAttributes();
  HttpServletRequest request = attributes.getRequest();
  String token = request.getHeader("token");
  if (StringUtils.isEmpty(token)) {
   throw new RuntimeException("非法請(qǐng)求，無(wú)效token");
  }
  // 校驗(yàn)token的業(yè)務(wù)邏輯
  // ...

  /*
   * 獲取注解的值，并進(jìn)行權(quán)限驗(yàn)證:
   * redis 中是否存在對(duì)應(yīng)的權(quán)限
   * redis 中沒(méi)有則從數(shù)據(jù)庫(kù)中獲取權(quán)限
   * 數(shù)據(jù)空中沒(méi)有，拋異常，非法請(qǐng)求，沒(méi)有權(quán)限
   * */
  Method method = ((MethodSignature) proceedingJoinPoint.getSignature()).getMethod();
  VisitPermission visitPermission = method.getAnnotation(VisitPermission.class);
  String value = visitPermission.value();
  // 校驗(yàn)權(quán)限的業(yè)務(wù)邏輯
  // List<Object> permissions = redis.get(permission)
  // db.getPermission
  // permissions.contains(value)
  // ...
  System.out.println(value);
  
  // 執(zhí)行具體方法
  Object result = proceedingJoinPoint.proceed();

  long endTime = System.currentTimeMillis();

  /*
   * 記錄相關(guān)執(zhí)行結(jié)果
   * 可以存入MongoDB 后期做數(shù)據(jù)分析
   * */
  // 打印請(qǐng)求 url
  System.out.println("URL   : " + request.getRequestURL().toString());
  // 打印 Http method
  System.out.println("HTTP Method : " + request.getMethod());
  // 打印調(diào)用 controller 的全路徑以及執(zhí)行方法
  System.out.println("controller  : " + proceedingJoinPoint.getSignature().getDeclaringTypeName());
  // 調(diào)用方法
  System.out.println("Method   : " + proceedingJoinPoint.getSignature().getName());
  // 執(zhí)行耗時(shí)
  System.out.println("cost-time  : " + (endTime - startTime) + " ms");

  return result;
 }
}

package org.ylc.note.aop;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.http.MediaType;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.MvcResult;
import org.springframework.test.web.servlet.request.MockMvcRequestBuilders;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.ylc.note.aop.controller.PermissionController;

@SpringBootTest
class AopApplicationTests {

 @Autowired
 private PermissionController permissionController;

 private MockMvc mvc;

 @BeforeEach
 void setupMockMvc() {
  mvc = MockMvcBuilders.standaloneSetup(permissionController).build();
 }

 @Test
 void apiTest() throws Exception {
  MvcResult result = mvc.perform(MockMvcRequestBuilders.get("/permission/test")
    .accept(MediaType.APPLICATION_JSON)
    .header("token", "9527"))
    .andReturn();
  System.out.println("api test result : " + result.getResponse().getContentAsString());
 }

}