这篇文章主要介绍了Linux网络编程之socket文件传输示例,对于基于Linux平台的C程序员来说有一定的借鉴价值,需要的朋友可以参考下
本文所述示例程序是基于Linux平台的socket网络编程,实现文件传输功能。该示例是基于TCP流协议实现的socket网络文件传输程序。采用C语言编写。最终能够实现传输任何格式文件的文件传输程序。
具体实现代码如下:
Server端代码如下:
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/*************************************************************************
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> File Name: Server.c
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> Author: SongLee
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************************************************************************/
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#include<netinet/in.h> // sockaddr_in
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#include<sys/types.h> // socket
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#include<sys/socket.h> // socket
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#include<stdio.h> // printf
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#include<stdlib.h> // exit
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#include<string.h> // bzero
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#define SERVER_PORT 8000
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#define LENGTH_OF_LISTEN_QUEUE 20
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#define BUFFER_SIZE 1024
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#define FILE_NAME_MAX_SIZE 512
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int main(void)
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{
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// 声明并初始化一个服务器端的socket地址结构
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struct sockaddr_in server_addr;
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bzero(&server_addr, sizeof(server_addr));
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server_addr.sin_family = AF_INET;
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server_addr.sin_addr.s_addr = htons(INADDR_ANY);
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server_addr.sin_port = htons(SERVER_PORT);
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// 创建socket,若成功,返回socket描述符
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int server_socket_fd = socket(PF_INET, SOCK_STREAM, 0);
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if(server_socket_fd < 0)
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{
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perror("Create Socket Failed:");
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exit(1);
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}
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int opt = 1;
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setsockopt(server_socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));
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// 绑定socket和socket地址结构
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if(-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr))))
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{
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perror("Server Bind Failed:");
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exit(1);
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}
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// socket监听
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if(-1 == (listen(server_socket_fd, LENGTH_OF_LISTEN_QUEUE)))
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{
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perror("Server Listen Failed:");
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exit(1);
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}
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while(1)
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{
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// 定义客户端的socket地址结构
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struct sockaddr_in client_addr;
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socklen_t client_addr_length = sizeof(client_addr);
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// 接受连接请求,返回一个新的socket(描述符),这个新socket用于同连接的客户端通信
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// accept函数会把连接到的客户端信息写到client_addr中
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int new_server_socket_fd = accept(server_socket_fd, (struct sockaddr*)&client_addr, &client_addr_length);
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if(new_server_socket_fd < 0)
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{
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perror("Server Accept Failed:");
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break;
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}
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// recv函数接收数据到缓冲区buffer中
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char buffer[BUFFER_SIZE];
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bzero(buffer, BUFFER_SIZE);
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if(recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0) < 0)
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{
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perror("Server Recieve Data Failed:");
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break;
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}
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// 然后从buffer(缓冲区)拷贝到file_name中
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char file_name[FILE_NAME_MAX_SIZE+1];
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bzero(file_name, FILE_NAME_MAX_SIZE+1);
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strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer));
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printf("%s\n", file_name);
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// 打开文件并读取文件数据
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FILE *fp = fopen(file_name, "r");
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if(NULL == fp)
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{
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printf("File:%s Not Found\n", file_name);
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}
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else
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{
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bzero(buffer, BUFFER_SIZE);
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int length = 0;
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// 每读取一段数据,便将其发送给客户端,循环直到文件读完为止
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while((length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
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{
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if(send(new_server_socket_fd, buffer, length, 0) < 0)
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{
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printf("Send File:%s Failed./n", file_name);
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break;
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}
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bzero(buffer, BUFFER_SIZE);
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}
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// 关闭文件
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fclose(fp);
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printf("File:%s Transfer Successful!\n", file_name);
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}
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// 关闭与客户端的连接
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close(new_server_socket_fd);
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}
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// 关闭监听用的socket
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close(server_socket_fd);
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return 0;
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}
Client端代码如下:
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/*************************************************************************
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> File Name: Client.c
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> Author: SongLee
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************************************************************************/
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#include<netinet/in.h> // sockaddr_in
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#include<sys/types.h> // socket
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#include<sys/socket.h> // socket
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#include<stdio.h> // printf
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#include<stdlib.h> // exit
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#include<string.h> // bzero
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#define SERVER_PORT 8000
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#define BUFFER_SIZE 1024
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#define FILE_NAME_MAX_SIZE 512
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int main()
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{
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// 声明并初始化一个客户端的socket地址结构
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struct sockaddr_in client_addr;
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bzero(&client_addr, sizeof(client_addr));
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client_addr.sin_family = AF_INET;
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client_addr.sin_addr.s_addr = htons(INADDR_ANY);
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client_addr.sin_port = htons(0);
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// 创建socket,若成功,返回socket描述符
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int client_socket_fd = socket(AF_INET, SOCK_STREAM, 0);
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if(client_socket_fd < 0)
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{
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perror("Create Socket Failed:");
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exit(1);
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}
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// 绑定客户端的socket和客户端的socket地址结构 非必需
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if(-1 == (bind(client_socket_fd, (struct sockaddr*)&client_addr, sizeof(client_addr))))
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{
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perror("Client Bind Failed:");
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exit(1);
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}
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// 声明一个服务器端的socket地址结构,并用服务器那边的IP地址及端口对其进行初始化,用于后面的连接
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struct sockaddr_in server_addr;
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bzero(&server_addr, sizeof(server_addr));
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server_addr.sin_family = AF_INET;
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if(inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) == 0)
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{
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perror("Server IP Address Error:");
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exit(1);
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}
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server_addr.sin_port = htons(SERVER_PORT);
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socklen_t server_addr_length = sizeof(server_addr);
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// 向服务器发起连接,连接成功后client_socket_fd代表了客户端和服务器的一个socket连接
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if(connect(client_socket_fd, (struct sockaddr*)&server_addr, server_addr_length) < 0)
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{
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perror("Can Not Connect To Server IP:");
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exit(0);
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}
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// 输入文件名 并放到缓冲区buffer中等待发送
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char file_name[FILE_NAME_MAX_SIZE+1];
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bzero(file_name, FILE_NAME_MAX_SIZE+1);
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printf("Please Input File Name On Server:\t");
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scanf("%s", file_name);
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char buffer[BUFFER_SIZE];
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bzero(buffer, BUFFER_SIZE);
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strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));
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// 向服务器发送buffer中的数据
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if(send(client_socket_fd, buffer, BUFFER_SIZE, 0) < 0)
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{
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perror("Send File Name Failed:");
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exit(1);
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}
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// 打开文件,准备写入
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FILE *fp = fopen(file_name, "w");
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if(NULL == fp)
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{
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printf("File:\t%s Can Not Open To Write\n", file_name);
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exit(1);
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}
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// 从服务器接收数据到buffer中
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// 每接收一段数据,便将其写入文件中,循环直到文件接收完并写完为止
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bzero(buffer, BUFFER_SIZE);
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int length = 0;
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while((length = recv(client_socket_fd, buffer, BUFFER_SIZE, 0)) > 0)
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{
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if(fwrite(buffer, sizeof(char), length, fp) < length)
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{
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printf("File:\t%s Write Failed\n", file_name);
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break;
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}
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bzero(buffer, BUFFER_SIZE);
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}
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// 接收成功后,关闭文件,关闭socket
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printf("Receive File:\t%s From Server IP Successful!\n", file_name);
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close(fp);
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close(client_socket_fd);
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return 0;
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}
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