Mini-Program/server-example/fixed-server.js

// 简单测试服务器 - 不连接数据库，专注于API接口测试和毛重字段处理
const express = require('express');
const bodyParser = require('body-parser');
const path = require('path');

// 创建Express应用
const app = express();
const PORT = 3000;

// 中间件
app.use(bodyParser.json());

// 请求日志中间件
app.use((req, res, next) => {
  const now = new Date();
  console.log(`[${now.toISOString()}] 收到请求: ${req.method} ${req.url}`);
  next();
});

// 简单测试接口
app.get('/api/test-connection', (req, res) => {
  res.json({
    success: true,
    message: '服务器连接测试成功',
    timestamp: new Date().toISOString(),
    serverInfo: { port: PORT }
  });
});

// 商品发布接口（简化版，专注于毛重处理）
app.post('/api/product/publish', (req, res) => {
  try {
    const { openid, product } = req.body;
    console.log('收到商品发布请求:', { openid, product });

    // 验证参数
    if (!openid || !product) {
      return res.status(400).json({ success: false, message: '缺少必要参数' });
    }

    // 重点：毛重字段处理逻辑
    let grossWeightValue = product.grossWeight;
    console.log('原始毛重值:', grossWeightValue, '类型:', typeof grossWeightValue);

    // 处理各种情况的毛重值
    if (grossWeightValue === '' || grossWeightValue === null || grossWeightValue === undefined || (typeof grossWeightValue === 'object' && grossWeightValue === null)) {
      grossWeightValue = null;
      console.log('毛重值为空或null，设置为null');
    } else {
      // 转换为数字
      const numValue = Number(grossWeightValue);
      if (!isNaN(numValue) && isFinite(numValue)) {
        grossWeightValue = numValue;
        console.log('毛重值成功转换为数字:', grossWeightValue);
      } else {
        grossWeightValue = null;
        console.log('毛重值不是有效数字，设置为null');
      }
    }

    // 返回处理结果
    return res.json({
      success: true,
      message: '商品发布处理成功（模拟）',
      processedData: {
        productName: product.productName,
        price: product.price,
        quantity: product.quantity,
        grossWeight: grossWeightValue, // 返回处理后的毛重值
        grossWeightType: typeof grossWeightValue
      }
    });

  } catch (error) {
    console.error('发布商品失败:', error);
    res.status(500).json({ success: false, message: '服务器错误', error: error.message });
  }
});

// 启动服务器
app.listen(PORT, () => {
  console.log(`修复版服务器运行在 http://localhost:${PORT}`);
  console.log('测试接口: http://localhost:3000/api/test-connection');
  console.log('商品发布接口: POST http://localhost:3000/api/product/publish');
});