linux socket TCP 服务器向客户端传文件（任意格式）

Server：

 

#include // sockaddr_in 
#include  // socket 
#include // socket 
#include    // printf 
#include   // exit 
#include   // bzero 

#define SERVER_PORT 8000 
#define LENGTH_OF_LISTEN_QUEUE 20 
#define BUFFER_SIZE 1024 
#define FILE_NAME_MAX_SIZE 512 

int main(void)
{
	// 声明并初始化一个服务器端的socket地址结构 
	struct sockaddr_in server_addr;
	bzero(&server_addr, sizeof(server_addr));
	server_addr.sin_family = AF_INET;
	server_addr.sin_addr.s_addr = htons(INADDR_ANY);
	server_addr.sin_port = htons(SERVER_PORT);

	// 创建socket，若成功，返回socket描述符 
	int server_socket_fd = socket(PF_INET, SOCK_STREAM, 0);
	if (server_socket_fd < 0)
	{
		perror("Create Socket Failed:");
		exit(1);
	}
	int opt = 1;
	setsockopt(server_socket_fd, SOL_SOCKET, SO_REUSEADDR, &opt, sizeof(opt));

	// 绑定socket和socket地址结构 
	if (-1 == (bind(server_socket_fd, (struct sockaddr*)&server_addr, sizeof(server_addr))))
	{
		perror("Server Bind Failed:");
		exit(1);
	}

	// socket监听 
	if (-1 == (listen(server_socket_fd, LENGTH_OF_LISTEN_QUEUE)))
	{
		perror("Server Listen Failed:");
		exit(1);
	}

	while (1)
	{
		// 定义客户端的socket地址结构 
		struct sockaddr_in client_addr;
		socklen_t client_addr_length = sizeof(client_addr);

		// 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 
		// accept函数会把连接到的客户端信息写到client_addr中 
		int new_server_socket_fd = accept(server_socket_fd, (struct sockaddr*)&client_addr, &client_addr_length);
		if (new_server_socket_fd < 0)
		{
			perror("Server Accept Failed:");
			break;
		}

		// recv函数接收数据到缓冲区buffer中 
		char buffer[BUFFER_SIZE];
		bzero(buffer, BUFFER_SIZE);
		if (recv(new_server_socket_fd, buffer, BUFFER_SIZE, 0) < 0)
		{
			perror("Server Recieve Data Failed:");
			break;
		}

		// 然后从buffer(缓冲区)拷贝到file_name中 
		char file_name[FILE_NAME_MAX_SIZE + 1];
		bzero(file_name, FILE_NAME_MAX_SIZE + 1);
		strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));
		printf("%s\n", file_name);

		// 打开文件并读取文件数据 
		FILE *fp = fopen(file_name, "r");
		if (NULL == fp)
		{
			printf("File:%s Not Found\n", file_name);
		}
		else
		{
			bzero(buffer, BUFFER_SIZE);
			int length = 0;
			// 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 
			while ((length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
			{
				if (send(new_server_socket_fd, buffer, length, 0) < 0)
				{
					printf("Send File:%s Failed./n", file_name);
					break;
				}
				bzero(buffer, BUFFER_SIZE);
			}

			// 关闭文件 
			fclose(fp);
			printf("File:%s Transfer Successful!\n", file_name);
		}
		// 关闭与客户端的连接 
		close(new_server_socket_fd);
	}
	// 关闭监听用的socket 
	close(server_socket_fd);
	return 0;
}

Client：

 

 

#include  // sockaddr_in 
#include  // socket 
#include  // socket 
#include    // printf 
#include    // exit 
#include    // bzero 

#define SERVER_PORT 8000 
#define BUFFER_SIZE 1024 
#define FILE_NAME_MAX_SIZE 512 

int main()
{
	// 声明并初始化一个客户端的socket地址结构 
	struct sockaddr_in client_addr;
	bzero(&client_addr, sizeof(client_addr));
	client_addr.sin_family = AF_INET;
	client_addr.sin_addr.s_addr = htons(INADDR_ANY);
	client_addr.sin_port = htons(0);

	// 创建socket，若成功，返回socket描述符 
	int client_socket_fd = socket(AF_INET, SOCK_STREAM, 0);
	if (client_socket_fd < 0)
	{
		perror("Create Socket Failed:");
		exit(1);
	}

	// 绑定客户端的socket和客户端的socket地址结构 非必需 
	if (-1 == (bind(client_socket_fd, (struct sockaddr*)&client_addr, sizeof(client_addr))))
	{
		perror("Client Bind Failed:");
		exit(1);
	}

	// 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 
	struct sockaddr_in server_addr;
	bzero(&server_addr, sizeof(server_addr));
	server_addr.sin_family = AF_INET;
	if (inet_pton(AF_INET, "127.0.0.1", &server_addr.sin_addr) == 0)
	{
		perror("Server IP Address Error:");
		exit(1);
	}
	server_addr.sin_port = htons(SERVER_PORT);
	socklen_t server_addr_length = sizeof(server_addr);

	// 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 
	if (connect(client_socket_fd, (struct sockaddr*)&server_addr, server_addr_length) < 0)
	{
		perror("Can Not Connect To Server IP:");
		exit(0);
	}

	// 输入文件名 并放到缓冲区buffer中等待发送 
	char file_name[FILE_NAME_MAX_SIZE + 1];
	char file_name_save[FILE_NAME_MAX_SIZE + 1];
	bzero(file_name, FILE_NAME_MAX_SIZE + 1);
	printf("Please Input File Name On Server:\t");
	scanf("%s", file_name);

	char buffer[BUFFER_SIZE];
	bzero(buffer, BUFFER_SIZE);
	strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));

	// 向服务器发送buffer中的数据 
	if (send(client_socket_fd, buffer, BUFFER_SIZE, 0) < 0)
	{
		perror("Send File Name Failed:");
		exit(1);
	}

	//输入要保存的地址
	printf("Please Input File Name to Save:\t");
	scanf("%s", file_name_save);

	// 打开文件，准备写入 
	FILE *fp = fopen(file_name_save, "w");
	if (NULL == fp)
	{
		printf("File:\t%s Can Not Open To Write\n", file_name_save);
		exit(1);
	}

	// 从服务器接收数据到buffer中 
	// 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 
	bzero(buffer, BUFFER_SIZE);
	int length = 0;
	while ((length = recv(client_socket_fd, buffer, BUFFER_SIZE, 0)) > 0)
	{
		if (fwrite(buffer, sizeof(char), length, fp) < length)
		{
			printf("File:\t%s Write Failed\n", file_name);
			break;
		}
		bzero(buffer, BUFFER_SIZE);
	}

	// 接收成功后，关闭文件，关闭socket 
	printf("Receive File:\t%s From Server IP Successful!\n", file_name);
	close(fp);
	close(client_socket_fd);
	return 0;
}