spring boot2.0+中添加全局异常捕获

1、添加自定义异常，继承RuntimeException，为什么继承RuntimeException呢？是因为我们的事务在RuntimeException异常下会发生回滚。

public class BusinessException extends RuntimeException{

    public BusinessException(String code, String msg){
        this.code = code;
        this.msg = msg;
    }

    private String code;
    private String msg;

    public String getCode() {
        return code;
    }
    public void setCode(String code) {
        this.code = code;
    }

    public String getMsg() {
        return msg;
    }

    public void setMsg(String msg) {
        this.msg = msg;
    }

}

2、添加全局异常捕获，使用@RestControllerAdvice 注解实现

public class CustomExtHandler {

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


    //捕获全局异常,处理所有不可知的异常
    @ExceptionHandler(value=Exception.class)
    Object handleException(Exception e,HttpServletRequest request){
        LOG.error("url {}, msg {}",request.getRequestURL(), e.getMessage());
        Map<String, Object> map = new HashMap<>();
        map.put("code", 100);
        map.put("msg", e.getMessage());
        map.put("url", request.getRequestURL());
        return map;
    }

    /**
     * 功能描述: 处理自定义异常类
     * @return
     *
     */
    @ExceptionHandler(value = BusinessException.class)
    Object handleMyException(BusinessException e, HttpServletRequest request){
        //f返回json数据
        Map<String, Object> map = new HashMap<>();
        map.put("code", e.getCode());
        map.put("msg", e.getMsg());
        map.put("url", request.getRequestURL());
        return map;
    }

3、使用

throw new BusinessException("200","出错了啊！");