在“javax.validation 与 Spring Boot 集成”章节您应该发现了，javax.validation 默认给出来的异常信息很丑，如下图：
此时，为我们可以利用 Spring Boot 的全局异常捕获进行处理，将输出的错误信息进行格式化，例如：
package com.hxstrive.springboot.validation.handler;
import com.hxstrive.springboot.validation.dto.CommonResult;
import org.springframework.validation.BindingResult;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;
import javax.validation.ConstraintViolation;
import javax.validation.ConstraintViolationException;
import java.util.List;
import java.util.Optional;
import java.util.Set;
/**
* 全局异常处理
* @author hxstrive.com
* @since 1.0.0 2024/2/2 9:15
*/
@ControllerAdvice
@ResponseBody
public class GlobalExceptionHandler {
/**
* 捕获 ConstraintViolationException 异常，并处理，该异常由验证框架抛出
*/
@ExceptionHandler(value = {ConstraintViolationException.class})
public CommonResult<?> handleResourceNotFoundException(ConstraintViolationException e) {
Set<ConstraintViolation<?>> violations = e.getConstraintViolations();
StringBuilder strBuilder = new StringBuilder();
for (ConstraintViolation<?> violation : violations) {
strBuilder.append(violation.getMessage()).append("\n");
}
CommonResult<?> response = new CommonResult<>();
response.setState(false);
response.setMessage(strBuilder.toString());
return response;
}
/**
* 捕获 MethodArgumentNotValidException 异常，并处理，该异常由验证框架抛出
*/
@ExceptionHandler(value = {MethodArgumentNotValidException.class})
public CommonResult<?> handleMethodArgumentNotValidException(MethodArgumentNotValidException e) {
BindingResult bindingResult = e.getBindingResult();
List<ObjectError> errorList = bindingResult.getAllErrors();
String message = null;
if(!errorList.isEmpty()) {
message = Optional.ofNullable(errorList.get(0)).map(ObjectError::getDefaultMessage).orElse("");
}
CommonResult<?> response = new CommonResult<>();
response.setState(false);
response.setMessage(Optional.ofNullable(message).orElse(e.getMessage()));
return response;
}
/**
* 搂底的异常处理，正常来讲不应该走到这里的，如果走到这里需要特别注意
*/
@ExceptionHandler(value = Exception.class)
public CommonResult<?> defaultErrorHandler(Exception e) {
CommonResult<?> response = new CommonResult<>();
response.setState(false);
response.setMessage("服务器错误，请稍后重试");
return response;
}
}添加了全局异常捕获后，重启应用程序，再次使用 ApiFox 访问接口，输出的错误信息更具可读性，如下图：
