//
// file_server.c??文件傳輸順序服務器示例
//
//本文件是服務器的代碼
#include <netinet/in.h>????// for sockaddr_in
#include <sys/types.h>????// for socket
#include <sys/socket.h>????// for socket
#include <stdio.h>????????// for printf
#include <stdlib.h>????????// for exit
#include <string.h>????????// for bzero

#define HELLO_WORLD_SERVER_PORT????6666?
#define LENGTH_OF_LISTEN_QUEUE??20
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512

int main(int argc, char **argv)
{
????//設置一個socket地址結構server_addr,代表服務器internet地址, 端口
????struct sockaddr_in server_addr;
????bzero(&server_addr,sizeof(server_addr)); //把一段內存區的內容全部設置為0
????server_addr.sin_family = AF_INET;
????server_addr.sin_addr.s_addr = htons(INADDR_ANY);
????server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);

????//創建用于internet的流協議(TCP)socket,用server_socket代表服務器socket
????int server_socket = socket(PF_INET,SOCK_STREAM,0);
????if( server_socket < 0)
????{
????????printf("Create Socket Failed!");
????????exit(1);
????}
????
????//把socket和socket地址結構聯系起來
????if( bind(server_socket,(struct sockaddr*)&server_addr,sizeof(server_addr)))
????{
????????printf("Server Bind Port : %d Failed!", HELLO_WORLD_SERVER_PORT);?
????????exit(1);
????}
????
????//server_socket用于監聽
????if ( listen(server_socket, LENGTH_OF_LISTEN_QUEUE) )
????{
????????printf("Server Listen Failed!");?
????????exit(1);
????}
????while (1) //服務器端要一直運行
????{
????????//定義客戶端的socket地址結構client_addr
????????struct sockaddr_in client_addr;
????????socklen_t length = sizeof(client_addr);

????????//接受一個到server_socket代表的socket的一個連接
????????//如果沒有連接請求,就等待到有連接請求--這是accept函數的特性
????????//accept函數返回一個新的socket,這個socket(new_server_socket)用于同連接到的客戶的通信
????????//new_server_socket代表了服務器和客戶端之間的一個通信通道
????????//accept函數把連接到的客戶端信息填寫到客戶端的socket地址結構client_addr中
????????int new_server_socket = accept(server_socket,(struct sockaddr*)&client_addr,&length);
????????if ( new_server_socket < 0)
????????{
????????????printf("Server Accept Failed!/n");
????????????break;
????????}
????????
????????char buffer[BUFFER_SIZE];
????????bzero(buffer, BUFFER_SIZE);
????????length = recv(new_server_socket,buffer,BUFFER_SIZE,0);//這里先接收客戶端發來的要獲取的文件名
????????if (length < 0)
????????{
????????????printf("Server Recieve Data Failed!/n");
????????????break;
????????}
????????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));
//????????int fp = open(file_name, O_RDONLY);
//????????if( fp < 0 )
????????FILE * fp = fopen(file_name,"r");
????????if(NULL == fp )
????????{
????????????printf("File:/t%s Not Found/n", file_name);
????????}
????????else
????????{
????????????bzero(buffer, BUFFER_SIZE);
????????????int file_block_length = 0;
//????????????while( (file_block_length = read(fp,buffer,BUFFER_SIZE))>0)
????????????while( (file_block_length = fread(buffer,sizeof(char),BUFFER_SIZE,fp))>0)
????????????{
????????????????printf("file_block_length = %d/n",file_block_length);
????????????????//發送buffer中的字符串到new_server_socket,實際是給客戶端
????????????????if(send(new_server_socket,buffer,file_block_length,0)<0)
????????????????{
????????????????????printf("Send File:/t%s Failed/n", file_name);
????????????????????break;
????????????????}
????????????????bzero(buffer, BUFFER_SIZE);
????????????}?????????????????????????????????????????????????????????????????//這段代碼是循環讀取文件的一段數據，在循環調用send，發送到客戶端，這里強調一點的TCP每次接受最多是1024字節，多了就會分片，因此每次發送時盡量不要超過1024字節。
//????????????close(fp);
????????????fclose(fp);
????????????printf("File:/t%s Transfer Finished/n",file_name);
????????}
????????//關閉與客戶端的連接
????????close(new_server_socket);
????}
????//關閉監聽用的socket
????close(server_socket);
????return 0;
}



//
// file_client.c??文件傳輸客戶端程序示例
//
//本文件是客戶機的代碼
#include <netinet/in.h>????// for sockaddr_in
#include <sys/types.h>????// for socket
#include <sys/socket.h>????// for socket
#include <stdio.h>????????// for printf
#include <stdlib.h>????????// for exit
#include <string.h>????????// for bzero


#define HELLO_WORLD_SERVER_PORT????6666?
#define BUFFER_SIZE 1024
#define FILE_NAME_MAX_SIZE 512

int main(int argc, char **argv)
{
????if (argc != 2)
????{
????????printf("Usage: ./%s ServerIPAddress/n",argv[0]);
????????exit(1);
????}

????//設置一個socket地址結構client_addr,代表客戶機internet地址, 端口
????struct sockaddr_in client_addr;
????bzero(&client_addr,sizeof(client_addr)); //把一段內存區的內容全部設置為0
????client_addr.sin_family = AF_INET;????//internet協議族
????client_addr.sin_addr.s_addr = htons(INADDR_ANY);//INADDR_ANY表示自動獲取本機地址
????client_addr.sin_port = htons(0);????//0表示讓系統自動分配一個空閑端口
????//創建用于internet的流協議(TCP)socket,用client_socket代表客戶機socket
????int client_socket = socket(AF_INET,SOCK_STREAM,0);
????if( client_socket < 0)
????{
????????printf("Create Socket Failed!/n");
????????exit(1);
????}
????//把客戶機的socket和客戶機的socket地址結構聯系起來
????if( bind(client_socket,(struct sockaddr*)&client_addr,sizeof(client_addr)))
????{
????????printf("Client Bind Port Failed!/n");?
????????exit(1);
????}

????//設置一個socket地址結構server_addr,代表服務器的internet地址, 端口
????struct sockaddr_in server_addr;
????bzero(&server_addr,sizeof(server_addr));
????server_addr.sin_family = AF_INET;
????if(inet_aton(argv[1],&server_addr.sin_addr) == 0) //服務器的IP地址來自程序的參數
????{
????????printf("Server IP Address Error!/n");
????????exit(1);
????}
????server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);
????socklen_t server_addr_length = sizeof(server_addr);
????//向服務器發起連接,連接成功后client_socket代表了客戶機和服務器的一個socket連接
????if(connect(client_socket,(struct sockaddr*)&server_addr, server_addr_length) < 0)
????{
????????printf("Can Not Connect To %s!/n",argv[1]);
????????exit(1);
????}

????char file_name[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));
????//向服務器發送buffer中的數據
????send(client_socket,buffer,BUFFER_SIZE,0);

//????int fp = open(file_name, O_WRONLY|O_CREAT);
//????if( fp < 0 )
????FILE * fp = fopen(file_name,"w");
????if(NULL == fp )
????{
????????printf("File:/t%s Can Not Open To Write/n", file_name);
????????exit(1);
????}
????
????//從服務器接收數據到buffer中
????bzero(buffer,BUFFER_SIZE);
????int length = 0;
????while( length = recv(client_socket,buffer,BUFFER_SIZE,0))???????//循環接收，再寫到文件
????{
????????if(length < 0)
????????{
????????????printf("Recieve Data From Server %s Failed!/n", argv[1]);
????????????break;
????????}
//????????int write_length = write(fp, buffer,length);
????????int write_length = fwrite(buffer,sizeof(char),length,fp);
????????if (write_length<length)
????????{
????????????printf("File:/t%s Write Failed/n", file_name);
????????????break;
????????}
????????bzero(buffer,BUFFER_SIZE);????
????}
????printf("Recieve File:/t %s From Server[%s] Finished/n",file_name, argv[1]);
????
????close(fp);
????//關閉socket
????close(client_socket);
????return 0;
}



測試：
服務器：?
gcc file_server.c?
./a.out

客服端：
gcc file_client.c
./a.out 192.168.1.2
（注意，執行到這一步的時候，就會有????Please Input File Name On Server:????，這時你需要輸入一個你要傳輸的文件名字，要傳輸文件的路徑要和放.c的文件路徑一致）

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