服務器端程序的編譯
gcc -o file_server file_server.c
客戶端程序的編譯
gcc -o file_client file_client.c
服務器程序和客戶端程應當分別運行在2臺計算機上.
服務器端程序的運行,在一個計算機的終端執行
./file_server
客戶端程序的運行,在另一個計算機的終端中執行
./file_client 運行服務器程序的計算機的IP地址
根據提示輸入要傳輸的服務器上的文件，該文件在服務器的運行目錄上
在實際編程和測試中,可以用2個終端代替2個計算機,這樣就可以在一臺計算機上測試網絡程序,
服務器端程序的運行,在一個終端執行
./file_server
客戶端程序的運行,在另一個終端中執行
./file_client 127.0.0.1
說明: 任何計算機都可以通過127.0.0.1訪問自己. 也可以用計算機的實際IP地址代替127.0.0.1
//
// 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);
??? ??? 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);
??? ??? ??? }
//??? ??? ??? 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))
??? {
??? ??? 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]);
???
??? fclose(fp);
??? //關閉socket
??? close(client_socket);
??? return 0;
}

轉載于:https://www.cnblogs.com/flyxiang2010/archive/2010/12/17/1909257.html

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