C++，java信息，文件传输

java客户端

 package client;

 import java.io.DataOutputStream;
 import java.io.File;
 import java.io.FileInputStream;
 import java.io.IOException;
 import java.net.InetSocketAddress;
 import java.net.Socket;  

 /**
  * 文件发送客户端主程序
  * @author admin_Hzw
  *
  */
 public class client {  

     /**
      * 程序main方法
      * @param args
      * @throws IOException
      */
     public static void main(String[] args) throws IOException {
         int length = ;
         double sumL =  ;
         byte[] sendBytes = null;
         Socket socket = null;
         DataOutputStream dos = null;
         FileInputStream fis = null;
         boolean bool = false;
         try {
             File file = new File("F:\\img\\6.jpg"); //要传输的文件路径
             long l = file.length();
             socket = new Socket();
             socket.connect(new InetSocketAddress("127.0.0.1", ));
             dos = new DataOutputStream(socket.getOutputStream());
             fis = new FileInputStream(file);
             sendBytes = new byte[];
             while ((length = fis.read(sendBytes, , sendBytes.length)) > ) {
                 sumL += length;
                 System.out.println("已传输："+((sumL/l)*)+"%");
                 dos.write(sendBytes, , length);
                 dos.flush();
             }
             //虽然数据类型不同，但JAVA会自动转换成相同数据类型后在做比较
             if(sumL==l){
                 bool = true;
             }
         }catch (Exception e) {
             System.out.println("客户端文件传输异常");
             bool = false;
             e.printStackTrace();
         } finally{
             if (dos != null)
                 dos.close();
             if (fis != null)
                 fis.close();
             if (socket != null)
                 socket.close();
         }
         System.out.println(bool?"成功":"失败");
     }
 }  

C++客户端

 #include <Winsock2.h>
 #include <cstdio>
 #include<iostream>
 using namespace std;
 #pragma comment(lib,"ws2_32.lib")
 void main()
 {
     WSADATA wsaData;
     SOCKET sockClient;//客户端Socket
     SOCKADDR_IN addrServer;//服务端地址
     WSAStartup(MAKEWORD(, ), &wsaData);    //一个socket的初始化函数
     sockClient = socket(AF_INET, SOCK_STREAM, );//新建客户端socket，AF_INET使用IPv4进行通讯
     //定义要连接的服务端地址
     addrServer.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");//目标IP(127.0.0.1是回送地址)
     addrServer.sin_family = AF_INET;
     addrServer.sin_port = htons();//连接端口6000
     //连接到服务端
     connect(sockClient, (SOCKADDR*)&addrServer, sizeof(SOCKADDR));
     //发送数据
     char message[] = "HelloSocket!";
     char messagerecv[] = "";
     send(sockClient, message, strlen(message) + , );
     recv(sockClient, messagerecv, , );
     printf("%s\n", messagerecv);

     //发送文件
     string file_name = "F:\\img\\6.jpg";
     FILE *fp = fopen(file_name.c_str(), "rb");
     int num = ;
     while (!feof(fp))
     {
         num = fread(message, , , fp);
         send(sockClient, message, num, );
     }

     /*
     //文件写操作
     string file_name = "F:\\img\\7.jpg";
     FILE *fp = fopen(file_name.c_str(), "wb");
     int num = 0;
     while (1)
     {
         num = recv(sockClient, message, 1000, 0);
         if (num == 0)
             break;
         fwrite(message, 1, num, fp);
     }
     */

     //关闭socket
     fclose(fp);
     closesocket(sockClient);
     WSACleanup();
 }

C++服务端

 #include <Winsock2.h>
 #include <cstdio>
 #include<iostream>
 using namespace std;
 #pragma comment(lib,"ws2_32.lib")
 void main()
 {
     WSADATA wsaData;
     SOCKET sockServer;
     SOCKADDR_IN addrServer;
     SOCKET sockClient;
     SOCKADDR_IN addrClient;
     WSAStartup(MAKEWORD(, ), &wsaData);
     sockServer = socket(AF_INET, SOCK_STREAM, );
     addrServer.sin_addr.S_un.S_addr = htonl(INADDR_ANY);//INADDR_ANY表示任何IP
     addrServer.sin_family = AF_INET;
     addrServer.sin_port = htons();//绑定端口6000
     bind(sockServer, (SOCKADDR*)&addrServer, sizeof(SOCKADDR));

     //Listen监听端
     listen(sockServer, );//5为等待连接数目
     printf("服务器已启动:\n监听中...\n");
     int len = sizeof(SOCKADDR);
     char message[];//发送至客户端的字符串
     char recvBuf[];//接受客户端返回的字符串

     //会阻塞进程，直到有客户端连接上来为止
     sockClient = accept(sockServer, (SOCKADDR*)&addrClient, &len);
     //接收并打印客户端数据
     //recv(sockClient, recvBuf, 1000, 0);
     sprintf(message, "%s", "gua");
     printf("%s\n", message);
     //send(sockClient, message, 1000, 0);
     printf("%s\n", recvBuf);

     /*
     //发送文件
     string file_name = "F:\\img\\6.jpg";
     FILE *fp = fopen(file_name.c_str(), "rb");
     int num = 0;
     while (!feof(fp))
     {
         num = fread(sendBuf, 1, 1000, fp);
         send(sockClient, sendBuf, num, 0);
     }
     */

     //文件写操作
     string file_name = "F:\\img\\7.jpg";
     FILE *fp = fopen(file_name.c_str(), "wb");
     int num = ;
     while ()
     {
         num = recv(sockClient, message, , );
         if (num == )
             break;
         fwrite(message, , num, fp);
     }

     fclose(fp);
     //关闭socket
     closesocket(sockClient);
     WSACleanup();
 }