@RestControllerAdvice
@Slf4j
public class ControllerExceptionHandleAdvice {
	@ExceptionHandler
	public R handler(HttpServletRequest req, HttpServletResponse res, Exception e) {
		if (e instanceof NullPointerException) {
			log.error("請(qǐng)求的方法名為:{},發(fā)生空指針異常:{}", req.getRequestURI(), ExceptionUtils.getStackTrace(e));
			return R.fail("執(zhí)行異常");
		} else if (e instanceof DataIntegrityViolationException) {
			String stackTrace = ExceptionUtils.getStackTrace(e);
			log.error("請(qǐng)求的方法名為:{},數(shù)據(jù)庫(kù)訪(fǎng)問(wèn)異常:{}", req.getRequestURI(), stackTrace);
			if (stackTrace.contains("唯一性約束")) {
				return R.fail("數(shù)據(jù)不能重復(fù)!");
			} else if (stackTrace.contains("非空約束")) {
				return R.fail("必填項(xiàng)不能空!");
			} else {
				return R.fail("數(shù)據(jù)庫(kù)異常");
			}
		}  else if (e instanceof SQLException) {
			log.error("請(qǐng)求的方法名為:{},數(shù)據(jù)庫(kù)訪(fǎng)問(wèn)異常:{}", req.getRequestURI(), ExceptionUtils.getStackTrace(e));
			return R.fail("數(shù)據(jù)庫(kù)訪(fǎng)問(wèn)執(zhí)行異常");
		} else {
			log.error("請(qǐng)求的方法名為:{},服務(wù)器代碼發(fā)生異常,請(qǐng)聯(lián)系管理員:{}", req.getRequestURI(), ExceptionUtils.getStackTrace(e));
			return R.fail("服務(wù)器代碼發(fā)生異常,請(qǐng)聯(lián)系管理員");
		}
	}
}

@Slf4j
@RestControllerAdvice
public class MyHandler {
     /**
     * 應(yīng)用到所有@RequestMapping注解方法，在其執(zhí)行之前初始化數(shù)據(jù)綁定器
     *
     * @param binder
     */
    @InitBinder
    public void initBinder(WebDataBinder binder) {
        log.info("初始化數(shù)據(jù)綁定器");
        log.info(binder.getFieldDefaultPrefix());
        log.info(binder.getFieldMarkerPrefix());
    }
    /**
     * 把值綁定到Model中，使全局@RequestMapping可以獲取到該值
     * @param model
     */
    @ModelAttribute
    public void addAttributes(Model model) {
        log.info("添加name參數(shù)");
        model.addAttribute("name", "allen");
    }
 }