SpringBoot中@ControllerAdvice注解的使用方法

@ControllerAdvice
public class ControllerExceptionHandler {
    /**
     * 校验的统一异常处理
     * @param e
     * @return ComResponse
     *
     * BindException 有针对性的,是校验不通过时,报的错误异常类做处理
     * Exception 对所有的报错异常做处理
     */
    @ExceptionHandler(value = {BindException.class})
    @ResponseBody
    public ComResponse validExceptionHandler(BindException e) {
        // 获取我们定义的校验失败的异常信息
        String msg = e.getBindingResult().getAllErrors().get(0).getDefaultMessage();
        ComResponse comResponse = new ComResponse<>();
        comResponse.setMsg(msg);
        comResponse.setSuccess(false);
        return comResponse;
    }
}

@ControllerAdvice
public class Test {
    @ModelAttribute(name = "globalData")
    public Map<String, Object> setGlobalData() {
        Map<String, Object> map = new HashMap<>(){
            {
                put("username", "吕星辰");
                put("uid", 123);
            }
        };
        return map;
    }
}

@RestController
public class UserController {
    @RequestMapping(value = "/test")
    public String userTest(Model model) {
        // 获取全局数据
        Map<String, Object> map = model.asMap();
        String json = JSON.toJSONString(map, SerializerFeature.PrettyFormat);
        System.out.println(json);
        return json;
    }
}