简单文件传输

 

-----原理：
文件传输的原理其实很简单，服务端先在某个端口监听，等待客户端的连接，连接成功后，服务端打开指定的文件，然后读取文件，再通过创建的套接字发送给客户端。如果要实现一个服务端能与多个客户端连接，则需要用到多线程，下面给出一对一的实现代码，有兴趣的朋友可以用多线程实现一对多。

-----程序代码：

 //fileserver.cc
 #include <iostream>
 #include <stdio.h>
 #include <strings.h>
 #include <stdlib.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <netinet/in.h>
 using namespace std;

 //./fileserver 2000 hahaya.txt 其中2000为端口号，hahaya.txt为文件名
 int main(int argc, char *argv[])
 {
     int sk = socket(AF_INET, SOCK_STREAM, 0);
     if(sk == -1)
     {
     cout << "create socket failed..." << endl;
     return 0;
     }

     struct sockaddr_in serveraddr;
     bzero(&serveraddr, sizeof(serveraddr));
     serveraddr.sin_family = AF_INET;
     serveraddr.sin_port = htons(atoi(argv[1]));
     serveraddr.sin_addr.s_addr = htonl(INADDR_ANY);
     if(bind(sk, (struct sockaddr*)&serveraddr, sizeof(serveraddr)) != 0)
     {
     cout << "bind failed..." << endl;
     close(sk);
     return 0;
     }

     listen(sk, 5);

     struct sockaddr_in clientaddr;
     bzero(&clientaddr, sizeof(clientaddr));
     size_t len = sizeof(clientaddr);

     int talk = accept(sk, (struct sockaddr*)&clientaddr, &len);

     //打开文件并准备发送
     cout << "server ready..." << endl;

     FILE *fp = fopen(argv[2], "r+");
     int size = 0;
     char buff[1024] = {'\0'};
     while((size = fread(buff, 1, sizeof(buff), fp)) > 0)
     {
     cout << "file sending..." << endl;
     send(talk, buff, size, 0);
     }


     cout << "send success..." << endl;
     fclose(fp);
     close(talk);
     close(sk);
     return 0;
 }

 //fileclient.cc
 #include <iostream>
 #include <stdio.h>
 #include <stdlib.h>
 #include <strings.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <arpa/inet.h>
 #include <netinet/in.h>
 using namespace std;

 //./clientserver 192.168.0.1 2000 hahaya.txt
 int main(int argc, char *argv[])
 {
     int sk = socket(AF_INET, SOCK_STREAM, 0);
     if(sk == -1)
     {
     cout << "create socket failed..." << endl;
     return 0;
     }

     struct sockaddr_in serveraddr;
     bzero(&serveraddr, sizeof(serveraddr));
     serveraddr.sin_family = AF_INET;
     serveraddr.sin_port = htons(atoi(argv[2]));
     serveraddr.sin_addr.s_addr = inet_addr(argv[1]);

     connect(sk, (struct sockaddr*)&serveraddr, sizeof(serveraddr));

     FILE *fp = fopen(argv[3], "w+");
     char buff[1024] = {'\0'};
     int len = 0;
     cout << "begin recv..." << endl;
     while((len = recv(sk, buff, sizeof(buff), 0)) > 0)
     {
     cout << "file recv..." << endl;
     fwrite(buff, 1, len, fp);
     }

     cout << "file success..." << endl;
     close(sk);
     fclose(fp);
     return 0;
 }

-----程序运行:
开启服务端: ./fileserver 2000 ./eclipse.zip
开启客户端: ./fileclient 192.168.254.128 2000 ./test.zip

这样就把eclipse.zip传到客户端了