qingcheng-houduan/src/main/java/com/greenorange/promotion/exception/GlobalExceptionHandler.java

package com.greenorange.promotion.exception;

import com.greenorange.promotion.common.BaseResponse;
import com.greenorange.promotion.common.ErrorCode;
import com.greenorange.promotion.common.ResultUtils;
import io.swagger.v3.oas.annotations.Hidden;
import lombok.extern.slf4j.Slf4j;
import net.sf.jsqlparser.util.validation.ValidationError;
import org.springframework.dao.InvalidDataAccessResourceUsageException;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.FieldError;
import org.springframework.validation.ObjectError;
import org.springframework.web.bind.MethodArgumentNotValidException;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.RestControllerAdvice;
import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;

import java.sql.SQLException;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.List;

/**
 * 全局异常处理器
 */
@Slf4j
@Hidden
@RestControllerAdvice
public class GlobalExceptionHandler {


    // 处理参数类型不匹配的异常（GET请求）
    @ExceptionHandler(MethodArgumentTypeMismatchException.class)
    public BaseResponse<?> handleMethodArgumentTypeMismatchException(MethodArgumentTypeMismatchException ex) {
        return ResultUtils.error(ErrorCode.PARAMS_ERROR, "请求参数类型不匹配: " + ex.getName());
    }


    // 处理消息体解析失败的异常（POST请求）
    @ExceptionHandler(HttpMessageNotReadableException.class)
    public BaseResponse<?> handleHttpMessageNotReadableException(HttpMessageNotReadableException e) {
        log.error("HttpMessageNotReadableException", e);
        return ResultUtils.error(ErrorCode.PARAMS_ERROR, "请求体不能为空或格式无效");
    }


    // 处理参数绑定失败的异常
    @ExceptionHandler(MethodArgumentNotValidException.class)
    public BaseResponse<?> handleMethodArgumentNotValidException(MethodArgumentNotValidException e) {
//        StringBuilder errors = new StringBuilder();
//        // 按字段名排序，确保每次返回的顺序一致
//        e.getBindingResult().getFieldErrors().stream()
//                .sorted(Comparator.comparing(FieldError::getField))  // 按字段名排序
//                .forEach(fieldError -> errors.append("参数: ")
//                        .append(fieldError.getField())
//                        .append(" | 错误: ")
//                        .append(fieldError.getDefaultMessage())
//                        .append("; "));
//        return ResultUtils.error(ErrorCode.PARAMS_ERROR, errors.toString());

                // 从所有 FieldError 里，排序后取第一个
                FieldError firstError = e.getBindingResult()
                        .getFieldErrors().stream().min(Comparator.comparing(FieldError::getField))
                        .orElse(null);

                // 直接取它的 defaultMessage，即注解里配置的 message
                String msg = (firstError != null)
                        ? firstError.getDefaultMessage()
                        : "参数校验失败";

                // 返回时只带 msg，不再拼前缀或字段名
                return ResultUtils.error(ErrorCode.PARAMS_ERROR, msg);
    }


    // 处理业务异常
    @ExceptionHandler(BusinessException.class)
    public BaseResponse<?> businessExceptionHandler(BusinessException e) {
        log.error("BusinessException", e);
        return ResultUtils.error(e.getCode(), e.getMessage());
    }


    // 处理 SQL 语法错误
    @ExceptionHandler(SQLException.class)
    public BaseResponse<?> handleSQLException(SQLException ex) {
        // 记录详细的 SQL 错误信息
        log.error("SQL 错误: " + ex.getMessage());
        return ResultUtils.error(ErrorCode.DATABASE_ERROR, "SQL语法错误，详细信息：" + ex.getMessage());
    }



}