From 3cb53546f882aa93b6688bc211c8ed95b574bad1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=82=B9=E5=AE=97=E6=A5=A0?= <zouzongnan1995@icloud.com>
Date: Tue, 12 May 2026 16:30:39 +0800
Subject: [PATCH] 1

---
 business/jxstore/event/event_tcp.go       | 10 ++++
 business/jxstore/event/event_tcp_utils.go | 64 +++++++++++++++++++++++
 2 files changed, 74 insertions(+)

diff --git a/business/jxstore/event/event_tcp.go b/business/jxstore/event/event_tcp.go
index 925298a7e..0c7e745c0 100644
--- a/business/jxstore/event/event_tcp.go
+++ b/business/jxstore/event/event_tcp.go
@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"git.rosy.net.cn/jx-callback/business/model/dao"
+	"git.rosy.net.cn/jx-print/globals"
 	"io"
 	"net"
 	"strings"
@@ -59,8 +60,17 @@ func handleConn(c net.Conn) error {
 	}
 	for {
 		buffer, n, err := ConnRead(c)
+
+		remoteAddr := c.RemoteAddr().(*net.TCPAddr)
+		remoteIP := remoteAddr.IP.String() // 打印机IP
+		remotePort := remoteAddr.Port      // 打印机端口
+		globals.SugarLogger.Debugf("remoteIP1: %s", remoteIP)
+		globals.SugarLogger.Debugf("remotePort1: %d", remotePort)
+
 		printRemoteAddr := c.RemoteAddr().String()
 		printRemoteAddr = strings.Split(printRemoteAddr, ":")[0]
+		globals.SugarLogger.Debugf("printRemoteAddr2: %s", printRemoteAddr)
+
 		if err != nil {
 			if err == io.EOF {
 				fmt.Println("connection close")
diff --git a/business/jxstore/event/event_tcp_utils.go b/business/jxstore/event/event_tcp_utils.go
index 25bdc8f43..8956fcf46 100644
--- a/business/jxstore/event/event_tcp_utils.go
+++ b/business/jxstore/event/event_tcp_utils.go
@@ -8,6 +8,7 @@ import (
 	"git.rosy.net.cn/jx-callback/business/model"
 	"git.rosy.net.cn/jx-callback/business/model/dao"
 	"git.rosy.net.cn/jx-callback/globals"
+	"log"
 	"net"
 	"regexp"
 	"strconv"
@@ -240,6 +241,11 @@ func (t *TcpClient) getPrintConn(key string) net.Conn {
 		return nil
 	}
 }
+func (t *TcpClient) setPrintConn(key string, c net.Conn) {
+	t.RLock()
+	defer t.RUnlock()
+	t.Clients[key].C = c
+}
 
 func (t *TcpClient) getPrintStatusTime(key string) time.Time {
 	t.RLock()
@@ -740,6 +746,23 @@ func doPrint(t *TcpClient, key string) (err error) {
 						return
 					}
 
+					// 链接已经关闭了
+					if isClosed(c) {
+						remoteAddr := c.RemoteAddr().(*net.TCPAddr)
+						remoteIP := remoteAddr.IP.String() // 打印机IP
+						remotePort := remoteAddr.Port      // 打印机端口
+						globals.SugarLogger.Debugf("remoteIP3: %s", remoteIP)
+						globals.SugarLogger.Debugf("remotePort3: %d", remotePort)
+
+						printRemoteAddr := c.RemoteAddr().String()
+						printRemoteAddr = strings.Split(printRemoteAddr, ":")[0]
+						globals.SugarLogger.Debugf("printRemoteAddr3: %s", printRemoteAddr)
+
+						c = reconnectPrinter(c)
+						if c != nil {
+							t.setPrintConn(printMsg.PrintNo, c)
+						}
+					}
 					if _, err = c.Write(data); err != nil {
 						globals.SugarLogger.Debugf("handleTcpMessages err [%v]", err)
 					} else {
@@ -880,3 +903,44 @@ func (t *TcpClient) changePrintMsg(data string, orderNo int64, printNo string) (
 	}
 	return err
 }
+
+// 工具函数：判断连接是否关闭
+func isClosed(conn net.Conn) bool {
+	buffer := make([]byte, 0)
+	// 设置读取超时=极短时间，不阻塞
+	conn.SetReadDeadline(time.Now().Add(1 * time.Millisecond))
+	_, err := conn.Read(buffer)
+	conn.SetReadDeadline(time.Time{}) // 重置超时
+
+	if err != nil {
+		if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
+			return false // 只是超时，连接正常
+		}
+	}
+	return true // 连接已关闭
+}
+
+var mu sync.Mutex
+
+// 自动重连
+func reconnectPrinter(printerConn net.Conn) net.Conn {
+	mu.Lock()
+	defer mu.Unlock()
+
+	if printerConn != nil {
+		printerConn.Close()
+	}
+
+	// 重试 5 次
+	for i := 0; i < 5; i++ {
+		conn, err := net.DialTimeout("tcp", "打印机IP:端口", 3*time.Second)
+		if err == nil {
+			printerConn = conn
+			log.Println("打印机重连成功")
+			return printerConn
+		}
+		time.Sleep(2 * time.Second)
+	}
+	log.Println("打印机重连失败")
+	return nil
+}