revert: 回滚打印机模块（云服务器无法访问局域网打印机）

src/main/java/com/example/building/service/PrinterService.java

@@ -1,20 +0,0 @@
-package com.example.building.service;
-
-import com.baomidou.mybatisplus.extension.service.IService;
-import com.example.building.entity.Printer;
-
-/**
- * 打印机服务接口
- */
-public interface PrinterService extends IService<Printer> {
-
-    /**
-     * 获取默认打印机
-     */
-    Printer getDefaultPrinter();
-
-    /**
-     * 打印订单小票
-     */
-    void printOrder(String orderId);
-}

src/main/java/com/example/building/service/impl/PrinterServiceImpl.java

@@ -1,151 +0,0 @@
-package com.example.building.service.impl;
-
-import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
-import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
-import com.example.building.entity.Order;
-import com.example.building.entity.Printer;
-import com.example.building.mapper.OrderMapper;
-import com.example.building.mapper.PrinterMapper;
-import com.example.building.service.PrinterService;
-import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.stereotype.Service;
-
-import java.io.OutputStream;
-import java.net.Socket;
-import java.nio.charset.StandardCharsets;
-import java.time.LocalDateTime;
-import java.time.format.DateTimeFormatter;
-
-/**
- * 打印机服务实现
- */
-@Service
-public class PrinterServiceImpl extends ServiceImpl<PrinterMapper, Printer> implements PrinterService {
-
-    @Autowired
-    private OrderMapper orderMapper;
-
-    @Override
-    public Printer getDefaultPrinter() {
-        return this.getOne(new LambdaQueryWrapper<Printer>()
-                .eq(Printer::getIsDefault, 1)
-                .eq(Printer::getStatus, 1)
-                .last("LIMIT 1"));
-    }
-
-    @Override
-    public void printOrder(String orderId) {
-        Printer printer = getDefaultPrinter();
-        if (printer == null) {
-            throw new RuntimeException("未找到默认打印机，请先配置打印机");
-        }
-
-        // 获取订单信息
-        Order order = orderMapper.selectById(orderId);
-        if (order == null) {
-            throw new RuntimeException("订单不存在");
-        }
-
-        // 生成ESC/POS指令
-        byte[] data = buildReceipt(order);
-
-        // 发送到打印机
-        sendToPrinter(printer.getIp(), printer.getPort(), data);
-    }
-
-    /**
-     * 生成小票ESC/POS指令
-     */
-    private byte[] buildReceipt(Order order) {
-        StringBuilder sb = new StringBuilder();
-        
-        // 初始化打印机
-        sb.append("\u001B@"); // ESC @
-        
-        // 居中对齐
-        sb.append("\u001Ba\u0001"); // ESC a 1
-        
-        // 打印标题
-        sb.append("\u001B!\u0038"); // ESC ! 56 大字+居中
-        sb.append("【订单小票】\n");
-        sb.append("\u001B!\u0000"); // ESC ! 0 恢复正常
-        
-        // 分隔线
-        sb.append("--------------------------------\n");
-        
-        // 左对齐
-        sb.append("\u001Ba\u0000"); // ESC a 0
-        
-        // 订单信息
-        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
-        sb.append("订单号: ").append(order.getOrderNo()).append("\n");
-        sb.append("时间: ").append(order.getCreatedAt().format(formatter)).append("\n");
-        sb.append("客户: ").append(order.getCustomerName() != null ? order.getCustomerName() : "散客").append("\n");
-        sb.append("电话: ").append(order.getCustomerPhone() != null ? order.getCustomerPhone() : "-").append("\n");
-        
-        // 分隔线
-        sb.append("--------------------------------\n");
-        
-        // 商品表头
-        sb.append(String.format("%-10s %4s %8s %8s\n", "商品", "数量", "单价", "小计"));
-        sb.append("--------------------------------\n");
-        
-        // TODO: 获取订单明细，这里暂时用固定内容演示
-        sb.append(String.format("%-10s %4d %8.2f %8.2f\n", 
-                "商品示例", 1, order.getTotalAmount().doubleValue(), order.getActualAmount().doubleValue()));
-        
-        // 分隔线
-        sb.append("--------------------------------\n");
-        
-        // 金额信息
-        sb.append(String.format("%-16s %10s\n", "原价合计:", "¥" + order.getTotalAmount()));
-        sb.append(String.format("%-16s %10s\n", "优惠金额:", "-¥" + order.getDiscountAmount()));
-        sb.append("\u001B!\u0008"); // ESC ! 8 放大
-        sb.append(String.format("%-16s %10s\n", "实付金额:", "¥" + order.getActualAmount()));
-        sb.append("\u001B!\u0000"); // ESC ! 0 恢复正常
-        
-        // 支付方式
-        String paymentMethod = getPaymentText(order.getPaymentMethod());
-        sb.append("支付方式: ").append(paymentMethod).append("\n");
-        
-        // 备注
-        if (order.getRemark() != null && !order.getRemark().isEmpty()) {
-            sb.append("备注: ").append(order.getRemark()).append("\n");
-        }
-        
-        // 尾部
-        sb.append("--------------------------------\n");
-        sb.append("\u001Ba\u0001"); // 居中
-        sb.append("谢谢惠顾，欢迎下次光临！\n");
-        sb.append("\n\n\n");
-        
-        // 切纸指令
-        sb.append("\u001Bd\u0003"); // ESC d 3 走纸3行
-        sb.append("\u001Bv\u0000"); // GS v 0 切纸
-        
-        return sb.toString().getBytes(StandardCharsets.UTF_8);
-    }
-
-    private String getPaymentText(String method) {
-        if (method == null) return "-";
-        switch (method) {
-            case "cash": return "现金";
-            case "wechat": return "微信";
-            case "alipay": return "支付宝";
-            default: return method;
-        }
-    }
-
-    /**
-     * 发送数据到打印机
-     */
-    private void sendToPrinter(String ip, int port, byte[] data) {
-        try (Socket socket = new Socket(ip, port);
-             OutputStream out = socket.getOutputStream()) {
-            out.write(data);
-            out.flush();
-        } catch (Exception e) {
-            throw new RuntimeException("打印失败: " + e.getMessage());
-        }
-    }
-}