一个服务端等待， 客户端上传文件到服务端，通过输入要上传的文件名，目前只做到仅对当前执行文件的目录下的文件，应该在服务端收到文件路径之后进行处理的。
服务端代码：
1 #include <netinet/in.h> // for sockaddr_in 2 #include <sys/types.h> // for socket 3 #include <sys/socket.h> // for socket 4 #include <stdio.h> // for printf 5 #include <stdlib.h> // for exit 6 #include <string.h> // for bzero 7 8 #define SERVER_PORT 6666 9 #define LISTEN_QUEUE 20 10 #define BUFFER_SIZE 1024 11 #define FILE_NAME_MAX_SIZE 512 12 13 int main(int argc, char **argv) 14 { 15 //设置一个socket地址结构server_addr,代表服务器internet地址, 端口 16 struct sockaddr_in server_addr; 17 bzero(&server_addr, sizeof(server_addr)); //把一段内存区的内容全部设置为0 18 server_addr.sin_family = AF_INET; 19 server_addr.sin_addr.s_addr = htons(INADDR_ANY); 20 server_addr.sin_port = htons(SERVER_PORT); 21 22 //创建用于internet的流协议(TCP)socket,用server_socket代表服务器socket 23 int server_socket = socket(PF_INET, SOCK_STREAM, 0); 24 if (server_socket < 0) 25 { 26 printf("Create Socket Failed!"); 27 exit(1); 28 } 29 30 //把socket和socket地址结构联系起来 31 if (bind(server_socket, (struct sockaddr*) &server_addr, 32 sizeof(server_addr))) 33 { 34 printf("Server Bind Port: %d Failed! ", SERVER_PORT); 35 exit(1); 36 } 37 38 //server_socket用于监听 39 if (listen(server_socket, LISTEN_QUEUE)) 40 { 41 printf("Server Listen Failed!"); 42 exit(1); 43 } 44 45 while (1) 46 { 47 //定义客户端的socket地址结构client_addr 48 char buffer[BUFFER_SIZE]; 49 struct sockaddr_in client_addr; 50 socklen_t length = sizeof(client_addr); 51 52 int client_socket = accept(server_socket, 53 (struct sockaddr*) &client_addr, &length); 54 if (client_socket < 0) 55 { 56 printf("Server Accept Failed! "); 57 break; 58 } 59 bzero(buffer, BUFFER_SIZE); 60 // 获取客户端要传输的文件名 61 length = recv(client_socket, buffer, BUFFER_SIZE, 0); 62 if (length < 0) 63 { 64 printf("Server Recieve Data Failed! "); 65 break; 66 } 67 char file_name[FILE_NAME_MAX_SIZE + 1]; 68 bzero(file_name, FILE_NAME_MAX_SIZE + 1); 69 strncpy( 70 file_name, 71 buffer, 72 strlen(buffer) > FILE_NAME_MAX_SIZE? FILE_NAME_MAX_SIZE : strlen(buffer)); 73 74 // 新建文件 75 FILE * fp = fopen(file_name, "w"); 76 if (NULL == fp) 77 { 78 printf("File: %s CAN NOT WRITE! ", file_name); 79 } 80 else 81 { 82 bzero(buffer, BUFFER_SIZE); 83 int file_block_length = 0; 84 while ((file_block_length = recv(client_socket, buffer, BUFFER_SIZE, 0)) > 0) 85 { 86 if (file_block_length < 0) 87 { 88 printf("Recieve Data From Client Failed! "); 89 break; 90 } 91 int write_length = fwrite(buffer, sizeof(char), file_block_length, fp); 92 if (write_length < file_block_length) 93 { 94 printf("File: %s Write Failed ", file_name); 95 break; 96 } 97 bzero(buffer, BUFFER_SIZE); 98 } 99 fclose(fp); 100 printf("File: %s Transfer Finished ", file_name); 101 } 102 //关闭与客户端的连接 103 close(client_socket); 104 } 105 //关闭监听用的socket 106 close(server_socket); 107 return 0; 108 }
客户端代码：
1 #include <netinet/in.h> // for sockaddr_in 2 #include <sys/types.h> // for socket 3 #include <sys/socket.h> // for socket 4 #include <stdio.h> // for printf 5 #include <stdlib.h> // for exit 6 #include <string.h> // for bzero 7 /* 8 #include <sys/types.h> 9 #include <sys/stat.h> 10 #include <fcntl.h> 11 #include <unistd.h> 12 */ 13 14 #define SERVER_PORT 6666 15 #define BUFFER_SIZE 1024 16 #define FILE_NAME_MAX_SIZE 512 17 18 int main(int argc, char **argv) 19 { 20 if (argc != 2) 21 { 22 printf("Please input the IP address of the server ", argv[0]); 23 exit(1); 24 } 25 26 //设置一个socket地址结构client_addr,代表客户机internet地址, 端口 27 struct sockaddr_in client_addr; 28 bzero(&client_addr, sizeof(client_addr)); //把一段内存区的内容全部设置为0 29 client_addr.sin_family = AF_INET; //internet协议族 30 client_addr.sin_addr.s_addr = htons(INADDR_ANY); //INADDR_ANY表示自动获取本机地址 31 client_addr.sin_port = htons(0); //0表示让系统自动分配一个空闲端口 32 //创建用于internet的流协议(TCP)socket,用client_socket代表客户机socket 33 int client_socket = socket(AF_INET, SOCK_STREAM, 0); 34 if (client_socket < 0) 35 { 36 printf("Create Socket Failed! "); 37 exit(1); 38 } 39 //把客户机的socket和客户机的socket地址结构联系起来 40 if (bind(client_socket, (struct sockaddr*) &client_addr, 41 sizeof(client_addr))) 42 { 43 printf("Client Bind Port Failed! "); 44 exit(1); 45 } 46 47 //设置一个socket地址结构server_addr,代表服务器的internet地址, 端口 48 struct sockaddr_in server_addr; 49 bzero(&server_addr, sizeof(server_addr)); 50 server_addr.sin_family = AF_INET; 51 if (inet_aton(argv[1], &server_addr.sin_addr) == 0) //服务器的IP地址来自程序的参数 52 { 53 printf("Server IP Address Error! "); 54 exit(1); 55 } 56 57 server_addr.sin_port = htons(SERVER_PORT); 58 socklen_t server_addr_length = sizeof(server_addr); 59 // 向服务器发起连接,连接成功后client_socket代表了客户机和服务器的一个socket连接 60 if (connect(client_socket, (struct sockaddr*) &server_addr, 61 server_addr_length) < 0) 62 { 63 printf("Can Not Connect To %s! ", argv[1]); 64 exit(1); 65 } 66 67 // 连接上服务器, 选择要上传的文件 68 char file_name[FILE_NAME_MAX_SIZE + 1];bzero 69 (file_name, FILE_NAME_MAX_SIZE + 1); 70 printf("Please Input File Name Upload To Server: "); 71 scanf("%s", file_name); 72 73 char buffer[BUFFER_SIZE]; 74 bzero(buffer, BUFFER_SIZE); 75 strncpy(buffer, file_name, 76 strlen(file_name) > BUFFER_SIZE? BUFFER_SIZE : strlen(file_name)); 77 78 FILE * fp = fopen(file_name, "r"); 79 if (NULL == fp) 80 { 81 printf("File: %s NOT FOUND! ", file_name); 82 exit(1); 83 } 84 85 // 发送文件名 86 int nameLength = send(client_socket, buffer, BUFFER_SIZE, 0); 87 if (nameLength < 0) 88 { 89 printf("File name Error! "); 90 exit(0); 91 } 92 93 bzero(buffer, BUFFER_SIZE); 94 int file_block_length = 0; 95 96 while ((file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) 97 > 0) 98 { 99 if (send(client_socket, buffer, file_block_length, 0) < 0) 100 { 101 printf("Send File: %s Failed ", file_name); 102 break; 103 } 104 bzero(buffer, BUFFER_SIZE); 105 } 106 printf("File: %s Transfer Finished ", file_name); 107 fclose(fp); 108 close(client_socket); 109 return 0; 110 }
代码很多是复制的，慢慢看一行行看懂之后把原来别人的客户端下载改成客户端上传，其实都差不多，服务端与客户端connect之后基本上就是文件读写的事了。
来自：http://www.cnblogs.com/lycheng/archive/2011/11/08/2240518.html