content: package com.cf.framework.exception;
  
  import com.cf.framework.domain.response.CommonCode;
  import com.cf.framework.domain.response.ResponseResult;
  import com.cf.framework.domain.response.ResultCode;
  import com.cf.framework.domain.ucenter.response.AuthCode;
  import com.google.common.collect.ImmutableMap;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.http.converter.HttpMessageNotReadableException;
  import org.springframework.security.access.AccessDeniedException;
  import org.springframework.util.StringUtils;
  import org.springframework.validation.BindException;
  import org.springframework.validation.FieldError;
  import org.springframework.web.bind.MissingServletRequestParameterException;
  import org.springframework.web.bind.annotation.ControllerAdvice;
  import org.springframework.web.bind.annotation.ExceptionHandler;
  import org.springframework.web.bind.annotation.ResponseBody;
  
  import javax.validation.ConstraintViolationException;
  
  /**
   * 统一异常捕获类
   * @author Administrator
   * @version 1.0
   * @create 2018-09-14 17:32
   **/
  @ControllerAdvice//控制器增强
  public class ExceptionCatch {
  
      private static final Logger LOGGER = LoggerFactory.getLogger(ExceptionCatch.class);
  
      //定义map，配置异常类型所对应的错误代码
      private static ImmutableMap<Class<? extends Throwable>, ResultCode> EXCEPTIONS;
      //定义map的builder对象，去构建ImmutableMap
      protected static ImmutableMap.Builder<Class<? extends Throwable>,ResultCode> builder = ImmutableMap.builder();
  
      //捕获CustomException此类异常
      @ExceptionHandler(CustomException.class)
      @ResponseBody
      public ResponseResult customException(CustomException customException){
          customException.printStackTrace();
          //记录日志
          ResultCode resultCode = customException.getResultCode();
          return new ResponseResult(resultCode);
      }
      //捕获Exception此类异常
      @ExceptionHandler(Exception.class)
      @ResponseBody
      public ResponseResult exception(Exception exception){
          exception.printStackTrace();
          //记录日志
          if(EXCEPTIONS == null){
              EXCEPTIONS = builder.build();//EXCEPTIONS构建成功
          }
          //从EXCEPTIONS中找异常类型所对应的错误代码，如果找到了将错误代码响应给用户，如果找不到给用户响应99999异常
          ResultCode resultCode = EXCEPTIONS.get(exception.getClass());
          if(resultCode !=null){
              if(exception instanceof BindException){
                  BindException bindException = (BindException) exception;
                  resultCode.setMixMessage(bindException.getBindingResult().getAllErrors().get(0).getDefaultMessage());
              }else if (!StringUtils.isEmpty(exception.getMessage())) {
                  resultCode.setMessage(exception.getMessage());
              }
              return new ResponseResult(resultCode);
          }else{
              //返回99999异常
              return new ResponseResult(CommonCode.SERVER_ERROR, null, exception.getMessage());
          }
  
  
      }
  
      static {
          //定义异常类型所对应的错误代码
          builder.put(HttpMessageNotReadableException.class,CommonCode.INVALID_PARAM);
          builder.put(ConstraintViolationException.class, CommonCode.INVALID_PARAM);
          builder.put(BindException.class, CommonCode.INVALID_PARAM);
          builder.put(MissingServletRequestParameterException.class, CommonCode.INVALID_PARAM);
          builder.put(AccessDeniedException.class, AuthCode.INSUFFICIENT_PERMISSIONS);
      }
  }
  