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@ControllerAdvice

public class CommonExceptionHandler {

/**

*  攔截Exception類的異常

* @param e

* @return

*/

@ExceptionHandler(Exception.class)

@ResponseBody

public Map<String,Object> exceptionHandler(Exception e){

Map<String,Object> result = new HashMap<String,Object>();

result.put("respCode", "9999");

result.put("respMsg", e.getMessage());

//正常開發中，可建立一個統一響應實體，如CommonResp

return result;

}

}

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/**

* 攔截 CommonException 的異常

* @param ex

* @return

*/

@ExceptionHandler(CommonException.class)

@ResponseBody

public Map<String,Object> exceptionHandler(CommonException ex){

log.info("CommonException：{}({})",ex.getMsg(), ex.getCode());

Map<String,Object> result = new HashMap<String,Object>();

result.put("respCode", ex.getCode());

result.put("respMsg", ex.getMsg());

return result;

}

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@ExceptionHandler(value = Exception.class)

public ModelAndView defaultErrorHandler(HttpServletRequest req, Exception e) throws Exception {

ModelAndView mav = new ModelAndView();

mav.addObject("exception", e);

mav.addObject("url", req.getRequestURL());

mav.setViewName(DEFAULT_ERROR_VIEW);

return mav;

}

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@Data

@NoArgsConstructor

@AllArgsConstructor

public class DemoReq {

@NotBlank(message="code不能為空")

String code;

@Length(max=10,message="name長度不能超過10")

String name;

}

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@GetMapping("/demo/valid")

public String demoValid(@Valid DemoReq req) {

return req.getCode() + "," + req.getName();

}

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public class ValidatorUtil {

private static Validator validator = ((HibernateValidatorConfiguration) Validation

.byProvider(HibernateValidator.class).configure()).failFast(true).buildValidatorFactory().getValidator();

/**

* 實體校驗

*

* @param obj

* @throws CommonException

*/

public static <T> void validate(T obj) throws CommonException {

Set<ConstraintViolation<T>> constraintViolations = validator.validate(obj, new Class[0]);

if (constraintViolations.size() > 0) {

ConstraintViolation<T> validateInfo = (ConstraintViolation<T>) constraintViolations.iterator().next();

// validateInfo.getMessage() 校驗不通過時的資訊，即message對應的值

throw new CommonException("0001", validateInfo.getMessage());

}

}

}

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@GetMapping("/demo/valid")

public String demoValid(@Valid DemoReq req) {

//手動校驗

ValidatorUtil.validate(req);

return req.getCode() + "," + req.getName();

}

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@Documented

//指定註解的處理類

@Constraint(validatedBy = {ConstantValidatorHandler.class })

@Target({ METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER })

@Retention(RUNTIME)

public @interface Constant {

String message() default "{constraint.default.const.message}";

Class<?>[] groups() default {};

Class<? extends Payload>[] payload() default {};

String value();

}

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public class ConstantValidatorHandler implements ConstraintValidator<Constant, String> {

private String constant;

@Override

public void initialize(Constant constraintAnnotation) {

//獲取設定的欄位值

this.constant = constraintAnnotation.value();

}

@Override

public boolean isValid(String value, ConstraintValidatorContext context) {

//判斷引數是否等於設定的欄位值，返回結果

return constant.equals(value);

}

}

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@Constant(message = "verson只能為1.0",value="1.0")

String version;

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@ExceptionHandler(MethodArgumentNotValidException.class)

public Map<String,Object> handleBindException(MethodArgumentNotValidException ex) {

FieldError fieldError = ex.getBindingResult().getFieldError();

log.info("引數校驗異常:{}({})", fieldError.getDefaultMessage(),fieldError.getField());

Map<String,Object> result = new HashMap<String,Object>();

result.put("respCode", "01002");

result.put("respMsg", fieldError.getDefaultMessage());

return result;

}

@ExceptionHandler(BindException.class)

public Map<String,Object> handleBindException(BindException ex) {

//校驗 除了 requestbody 註解方式的引數校驗 對應的 bindingresult 為 BeanPropertyBindingResult

FieldError fieldError = ex.getBindingResult().getFieldError();

log.info("必填校驗異常:{}({})", fieldError.getDefaultMessage(),fieldError.getField());

Map<String,Object> result = new HashMap<String,Object>();

result.put("respCode", "01002");

result.put("respMsg", fieldError.getDefaultMessage());

return result;

}