JAVA与VB通过SOCKET通讯

JAVA与VB通过SOCKET通讯

在做项目的过程中，本来是想使用JAVA的comm.jar工具实现串口通讯，不知道怎么回事，总是取不到电脑的串口。所以，改为现在的这种模式：java通过socket给vb程序发送指令，然后VB程序通过comm部件给串口发送指令。效果不错。

程序服务端使用VB实现：

代码：

Private lngWSKIndex As Long
Private Sub Form_Load()
   lvRecord.ColumnHeaders.Clear
   lvRecord.ColumnHeaders.Add , , "ID", lvRecord.Width / 15
   lvRecord.ColumnHeaders.Add , , "客户端序列号", lvRecord.Width / 4
   lvRecord.ColumnHeaders.Add , , "内容", lvRecord.Width
   lvRecord.ListItems.Clear
   wskServer(0).LocalPort = 9999
   wskServer(0).Listen
   lngWSKIndex = 0
   If MSComm1.PortOpen = True Then
   MSComm1.PortOpen = False
     Else
     End If
MSComm1.CommPort = 1
MSComm1.Settings = "9600,n,8,1"
MSComm1.PortOpen = True
   
End Sub

Private Sub wskServer_Close(Index As Integer)
  
  If Index = 0 Then Exit Sub
   
  '关闭客户端对应的应答Socket
   Close #Index
   
   '卸载自动加载控件，节省资源
   Unload wskServer(Index)
End Sub

'服务器端接收到连接请求
Private Sub wskServer_ConnectionRequest(Index As Integer, ByVal requestID As Long)
   lngWSKIndex = lngWSKIndex + 1                     '连接号自动加1
   Load wskServer(lngWSKIndex)                       '加载客户端连接请求对应的应答Socket
   wskServer(lngWSKIndex).Accept requestID           '允许连接
End Sub

Private Sub wskServer_DataArrival(Index As Integer, ByVal bytesTotal As Long)
    Dim strGetData As String
    Dim nCount As Integer
    Dim i As Integer
    
    wskServer(Index).GetData strGetData, vbString
    nCount = lvRecord.ListItems.Count
    nCount = nCount + 1
    If strGetData = "1=1" Then
    lvRecord.ListItems.Add , , nCount
    lvRecord.ListItems(nCount).ListSubItems.Add , , "接收到第" & Index & "个警报"
    lvRecord.ListItems(nCount).ListSubItems.Add , , "未结账通过"
    End If                                                      '只对接收到的客户端发送命令
       ' wskServer(Index).SendData "信息：" & strGetData & "已收到！"
        Dim Temp(0) As Byte
        Dim strBuff As String
        strBuff = strGetData
        MSComm1.Output = strBuff
    
End Sub

需要添加Winsock部件和MSComm部件

程序的客户端JAVA代码

package com;

import java.io.*;
import java.net.*;

public class Socket_t {

public static void main(String args[]){ 
 try {
  Socket_t.SendData("1=1");
  Thread.sleep(10000L);
  Socket_t.SendData("1=0");
 } catch (InterruptedException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 
}

public static void  SendData(String data){
  try{
         Socket socket=new Socket("127.0.0.1",9999);
         BufferedReader sin=new BufferedReader(new InputStreamReader(System.in));
         PrintWriter os=new PrintWriter(socket.getOutputStream());
         BufferedReader is=new BufferedReader(new InputStreamReader(socket.getInputStream()));
            os.write(data);
           
            os.flush();
            os.close(); //关闭Socket输出流
           socket.close(); //关闭Socket
         }catch(Exception e){
          e.printStackTrace();
         }
}
}