一、@RestControllerAdvice和 @ExceptionHandler拦截异常 

package com.lxk.socket.collector.common;

import com.lxk.base.bean.CommonResult;
import com.lxk.base.exception.BusinessRuntimeException;
import org.apache.commons.lang.exception.ExceptionUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;


@RestControllerAdvice
public class GlobalExceptionResolver {

    private static final Logger LOG = LoggerFactory.getLogger(GlobalExceptionResolver.class);

    /**
     * 处理所有不可知异常
     */
    @ExceptionHandler(Exception.class)
    public CommonResult handleException(Exception e) {
        LOG.error(e.getMessage(), e);
        return CommonResult.error(HttpStatus.INTERNAL_SERVER_ERROR.value(), "操作失败!，系统异常," + ExceptionUtils.getRootCauseMessage(e));
    }

    /**
     * 处理所有业务异常
     */
    @ExceptionHandler(BusinessRuntimeException.class)
    public ResponseEntity handleOpdRuntimeException(BusinessRuntimeException e) {
        // 不打印异常堆栈信息
        LOG.error(e.getMsg());
        if("409".equals(e.getCode())){
            return ResponseEntity.status(HttpStatus.CONFLICT.value()).body("不能重复建立连接！");
        }else{
            throw  e;
        }
    }
}

二、ResponseEntity更改HTTP Status Code

 /**
     * 处理所有业务异常
     */
    @ExceptionHandler(BusinessRuntimeException.class)
    public ResponseEntity handleOpdRuntimeException(BusinessRuntimeException e) {
        // 不打印异常堆栈信息
        LOG.error(e.getMsg());
        if("409".equals(e.getCode())){
            return ResponseEntity.status(HttpStatus.CONFLICT.value()).body("不能重复建立连接！");
        }else{
            throw  e;
        }
    }

HTTP Status Code

常用的几种状态码