How does spring boot use spring AOP to implement interceptors

In spring boot, a simple step is to use spring AOP to implement 1 interceptor:

1. Introduction of dependencies:

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

2, create interceptor class (defined in the class, the blocking rule: intercept com. xjj. web. controller package all the classes below, an @ RequestMapping annotation methods.) :

/** 
 *  Interceptor: Logs user actions to check if the user is logged in...  
 * @author XuJijun 
 */ 
@Aspect 
@Component 
public class ControllerInterceptor { 
  private static final Logger logger = LoggerFactory.getLogger(ControllerInterceptor.class); 
   
  @Value("${spring.profiles}") 
  private String env; 
   
  /** 
   *  Define interception rules: Intercept com.xjj.web.controller Of all the classes below the package, there are @RequestMapping Method of annotation.  
   */ 
  @Pointcut("execution(* com.xjj.web.controller..*(..)) and @annotation(org.springframework.web.bind.annotation.RequestMapping)") 
  public void controllerMethodPointcut(){} 
   
  /** 
   *  Specific implementation of the interceptor  
   * @param pjp 
   * @return JsonResult (The execution result of the blocked method, or an error message requiring login.)  
   */ 
  @Around("controllerMethodPointcut()") // Specify interceptor rules; Or you can just put" execution(* com.xjj.........) "Let me write it here  
  public Object Interceptor(ProceedingJoinPoint pjp){ 
    long beginTime = System.currentTimeMillis(); 
    MethodSignature signature = (MethodSignature) pjp.getSignature(); 
    Method method = signature.getMethod(); // Gets the method that is intercepted  
    String methodName = method.getName(); // Gets the name of the method being intercepted  
     
    Set<Object> allParams = new LinkedHashSet<>(); // Save all request parameters for output to the log  
     
    logger.info(" Request start, Method: {}", methodName); 
     
    Object result = null; 
 
    Object[] args = pjp.getArgs(); 
    for(Object arg : args){ 
      //logger.debug("arg: {}", arg); 
      if (arg instanceof Map<?, ?>) { 
        // In the extraction method MAP Parameter used for logging  
        @SuppressWarnings("unchecked") 
        Map<String, Object> map = (Map<String, Object>) arg; 
 
        allParams.add(map); 
      }else if(arg instanceof HttpServletRequest){ 
        HttpServletRequest request = (HttpServletRequest) arg; 
        if(isLoginRequired(method)){ 
          if(!isLogin(request)){ 
            result = new JsonResult(ResultCode.NOT_LOGIN, " This operation requires login! Log in? \n\n Don't know your login account? Please contact Lao Xu. ", null); 
          } 
        } 
         
        // To obtain query string  or  posted form data parameter  
        Map<String, String[]> paramMap = request.getParameterMap(); 
        if(paramMap!=null && paramMap.size()>0){ 
          allParams.add(paramMap); 
        } 
      }else if(arg instanceof HttpServletResponse){ 
        //do nothing... 
      }else{ 
        //allParams.add(arg); 
      } 
    } 
     
    try { 
      if(result == null){ 
        // 1 Continue execution of the intercepted method if it is normal  
        result = pjp.proceed(); 
      } 
    } catch (Throwable e) { 
      logger.info("exception: ", e); 
      result = new JsonResult(ResultCode.EXCEPTION, " Exception occurs: "+e.getMessage()); 
    } 
     
    if(result instanceof JsonResult){ 
      long costMs = System.currentTimeMillis() - beginTime; 
      logger.info("{} End of request, time consuming: {}ms", methodName, costMs); 
    } 
     
    return result; 
  } 
   
  /** 
   *  judge 1 Whether or not a method requires login  
   * @param method 
   * @return 
   */ 
  private boolean isLoginRequired(Method method){ 
    if(!env.equals("prod")){ // Only production environments require login  
      return false; 
    } 
     
    boolean result = true; 
    if(method.isAnnotationPresent(Permission.class)){ 
      result = method.getAnnotation(Permission.class).loginReqired(); 
    } 
     
    return result; 
  } 
   
  // Determine if you are logged in  
  private boolean isLogin(HttpServletRequest request) { 
    return true; 
    /*String token = XWebUtils.getCookieByName(request, WebConstants.CookieName.AdminToken); 
    if("1".equals(redisOperator.get(RedisConstants.Prefix.ADMIN_TOKEN+token))){ 
      return true; 
    }else { 
      return false; 
    }*/ 
  } 
} 

3, test,

The browser input: http: / / localhost: 8082 / api admin/login

Test results:

2016-07-26 11:58:12,057:INFO http-nio-8082-exec-1 (ControllerInterceptor.java:58) -  Request start, Method: login 
2016-07-26 11:58:12,061:INFO http-nio-8082-exec-1 (ControllerInterceptor.java:103) - login End of request, time consuming: 8ms 

Verify that the interceptor is in effect.

Source code reference: https: / / github com xujijun/my spring -- boot

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