package com.linghu.config;
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import com.linghu.model.common.ResponseResult;
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import org.springframework.validation.BindingResult;
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import org.springframework.validation.FieldError;
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import org.springframework.web.bind.MethodArgumentNotValidException;
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import org.springframework.web.bind.annotation.ExceptionHandler;
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import org.springframework.web.bind.annotation.RestControllerAdvice;
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import javax.validation.ConstraintViolation;
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import javax.validation.ConstraintViolationException;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Set;
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// 全局异常处理器，作用于所有 @RestController 注解的控制器
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@RestControllerAdvice
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public class GlobalExceptionHandler {
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// 处理 @RequestBody 参数校验失败的异常（如 DTO 中的校验）
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@ExceptionHandler(MethodArgumentNotValidException.class)
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public ResponseResult handleMethodArgumentNotValid(MethodArgumentNotValidException e) {
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Map<String, String> errors = new HashMap<>();
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// 获取所有校验失败的字段和消息
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BindingResult bindingResult = e.getBindingResult();
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for (FieldError fieldError : e.getBindingResult().getFieldErrors()) {
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// 字段名 -> 错误消息（如 "keyword: 关键词不能为空"）
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errors.put(fieldError.getField(), fieldError.getDefaultMessage());
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}
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// 返回自定义的错误响应（根据你的 ResponseResult 结构调整）
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return ResponseResult.error("参数校验失败"+ errors);
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}
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// 处理 @RequestParam/@PathVariable 参数校验失败的异常
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@ExceptionHandler(ConstraintViolationException.class)
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public ResponseResult<Map<String, String>> handleConstraintViolation(ConstraintViolationException e) {
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Map<String, String> errors = new HashMap<>();
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for (ConstraintViolation<?> violation : e.getConstraintViolations()) {
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String field = violation.getPropertyPath().toString();
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String simplifiedField = field.substring(field.lastIndexOf('.') + 1);
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errors.put(simplifiedField, violation.getMessage());
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}
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return ResponseResult.error("参数校验失败"+ errors);
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}
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}
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