//////////////////////////////////////服務器代碼/////////////////////////////////////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#include <time.h>        //for time_t and time#define HELLO_WORLD_SERVER_PORT 7754#define LENGTH_OF_LISTEN_QUEUE 20#define BUFFER_SIZE 1024int 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0server_addr.sin_family = AF_INET;server_addr.sin_addr.s_addr = htons(INADDR_ANY);server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);// time_t now;FILE *stream;//創建用于internet的流協議(TCP)socket,用server_socket代表服務器socketint server_socket = socket(AF_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{struct sockaddr_in client_addr;socklen_t length = sizeof(client_addr);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);strcpy(buffer,"Hello,World! 從服務器來！");strcat(buffer,"/n"); //C語言字符串連接send(new_server_socket,buffer,BUFFER_SIZE,0);bzero(buffer,BUFFER_SIZE);//接收客戶端發送來的信息到buffer中length = recv(new_server_socket,buffer,BUFFER_SIZE,0);if (length < 0){printf("Server Recieve Data Failed!/n");exit(1);}printf("/n%s",buffer);if((stream = fopen("data1","r"))==NULL){printf("The file 'data1' was not opened! /n");exit(1);}elseprintf("The file 'filename' was opened! /n");bzero(buffer,BUFFER_SIZE);int lengsize = 0;while((lengsize = fread(buffer,1,1024,stream)) > 0){printf("lengsize = %d/n",lengsize);if(send(new_server_socket,buffer,lengsize,0)<0){printf("Send File is Failed/n");break;}bzero(buffer, BUFFER_SIZE);}if(fclose(stream))printf("The file 'data' was not closed! /n");exit(1);    //關閉與客戶端的連接close(new_server_socket);    }//關閉監聽用的socketclose(server_socket);return 0;}

//////////////////////////////////////客戶端代碼/////////////////////////////////////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#include <time.h>        //for time_t and time#include <arpa/inet.h>#define HELLO_WORLD_SERVER_PORT  7754#define BUFFER_SIZE 1024int main(int argc, char **argv){if (argc != 2){printf("Usage: ./%s ServerIPAddress/n",argv[0]);exit(1);}//time_t now;FILE *stream;//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0client_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socketint 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 buffer[BUFFER_SIZE];bzero(buffer,BUFFER_SIZE);//從服務器接收數據到buffer中int length = recv(client_socket,buffer,BUFFER_SIZE,0);if(length < 0){printf("Recieve Data From Server %s Failed!/n", argv[1]);exit(1);}printf("/n%s/n",buffer);bzero(buffer,BUFFER_SIZE);bzero(buffer,BUFFER_SIZE);strcpy(buffer,"Hello, World! From Client/n");//向服務器發送buffer中的數據send(client_socket,buffer,BUFFER_SIZE,0);if((stream = fopen("data","w+t"))==NULL){printf("The file 'data' was not opened! /n");}elsebzero(buffer,BUFFER_SIZE);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 = fwrite(buffer,sizeof(char),length,stream);if (write_length<length){printf("File is Write Failed/n");break;}bzero(buffer,BUFFER_SIZE); }printf("Recieve File From Server[%s] Finished/n", argv[1]);//關閉 文件fclose(stream);//關閉socketclose(client_socket);return 0;}