Linux C实现文件传输

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////////////////////////////////////////////////////////////////////////////////////// 
// file_server.c  文件传输顺序服务器示例  
////////////////////////////////////////////////////////////////////////////////////// 
//本文件是服务器的代码 
#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 <sys/types.h> 
#include <sys/stat.h> 
#include <fcntl.h> 
#include <unistd.h> 
*/
#define HELLO_WORLD_SERVER_PORT    6666   
#define LENGTH_OF_LISTEN_QUEUE  20  
#define BUFFER_SIZE 1024  
#define FILE_NAME_MAX_SIZE 512  
       
intmain(intargc, char**argv)  
{ 
    //设置一个socket地址结构server_addr,代表服务器internet地址, 端口  
    structsockaddr_in server_addr;  
    bzero(&server_addr,sizeof(server_addr));//把一段内存区的内容全部设置为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);  
       
    //创建用于internet的流协议(TCP)socket,用server_socket代表服务器socket 
    intserver_socket = socket(PF_INET,SOCK_STREAM,0);  
    if( server_socket < 0)  
    { 
        printf("Create Socket Failed!"); 
        exit(1); 
    } 
           
    //把socket和socket地址结构联系起来 
    if( bind(server_socket,(structsockaddr*)&server_addr,sizeof(server_addr))) 
    { 
        printf("Server Bind Port : %d Failed!", HELLO_WORLD_SERVER_PORT);   
        exit(1); 
    } 
           
    //server_socket用于监听 
    if( listen(server_socket, LENGTH_OF_LISTEN_QUEUE) )  
    { 
        printf("Server Listen Failed!");  
        exit(1); 
    } 
    while(1) //服务器端要一直运行 
    { 
        //定义客户端的socket地址结构client_addr 
        structsockaddr_in client_addr;  
        socklen_t length = sizeof(client_addr); 
       
        //接受一个到server_socket代表的socket的一个连接 
        //如果没有连接请求,就等待到有连接请求--这是accept函数的特性 
        //accept函数返回一个新的socket,这个socket(new_server_socket)用于同连接到的客户的通信 
        //new_server_socket代表了服务器和客户端之间的一个通信通道 
        //accept函数把连接到的客户端信息填写到客户端的socket地址结构client_addr中 
        intnew_server_socket = accept(server_socket,(structsockaddr*)&client_addr,&length);  
        if( new_server_socket < 0)  
        { 
            printf("Server Accept Failed!n"); 
            break; 
        } 
               
        charbuffer[BUFFER_SIZE];  
        bzero(buffer, BUFFER_SIZE);  
        length = recv(new_server_socket,buffer,BUFFER_SIZE,0);//这里先接收客户端发来的要获取的文件名 
        if(length < 0)  
        { 
            printf("Server Recieve Data Failed!n"); 
            break; 
        } 
        charfile_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 Foundn", file_name);  
        } 
        else
        { 
            bzero(buffer, BUFFER_SIZE);  
            intfile_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 = %dn",file_block_length); 
                //发送buffer中的字符串到new_server_socket,实际是给客户端 
                if(send(new_server_socket,buffer,file_block_length,0)<0) 
                { 
                    printf("Send File:t%s Failedn", file_name);  
                    break; 
                } 
                bzero(buffer, BUFFER_SIZE);  
            }                                                                //这段代码是循环读取文件的一段数据，在循环调用send，发送到客户端，这里强调一点的TCP每次接受最多是1024字节，多了就会分片，因此每次发送时尽量不要超过1024字节。 
//            close(fp);  
            fclose(fp); 
            printf("File:t%s Transfer Finishedn",file_name); 
        } 
        //关闭与客户端的连接 
        close(new_server_socket); 
    } 
    //关闭监听用的socket 
    close(server_socket); 
    return0;  
}

file_client.c 文件传输客户端程序示例

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////////////////////////////////////////////////////////////////////////////////////// 
// file_client.c  文件传输客户端程序示例  
////////////////////////////////////////////////////////////////////////////////////// 
//本文件是客户机的代码 
#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 <sys/types.h> 
#include <sys/stat.h> 
#include <fcntl.h> 
#include <unistd.h> 
*/
       
#define HELLO_WORLD_SERVER_PORT    6666   
#define BUFFER_SIZE 1024  
#define FILE_NAME_MAX_SIZE 512  
       
intmain(intargc, char**argv)  
{ 
    if(argc != 2)  
    { 
        printf("Usage: ./%s ServerIPAddressn",argv[0]); 
        exit(1); 
    } 
       
    //设置一个socket地址结构client_addr,代表客户机internet地址, 端口  
    structsockaddr_in client_addr;  
    bzero(&client_addr,sizeof(client_addr));//把一段内存区的内容全部设置为0 
    client_addr.sin_family = AF_INET;    //internet协议族 
    client_addr.sin_addr.s_addr = htons(INADDR_ANY);//INADDR_ANY表示自动获取本机地址 
    client_addr.sin_port = htons(0);    //0表示让系统自动分配一个空闲端口 
    //创建用于internet的流协议(TCP)socket,用client_socket代表客户机socket 
    intclient_socket = socket(AF_INET,SOCK_STREAM,0);  
    if( client_socket < 0)  
    { 
        printf("Create Socket Failed!n"); 
        exit(1); 
    } 
    //把客户机的socket和客户机的socket地址结构联系起来 
    if( bind(client_socket,(structsockaddr*)&client_addr,sizeof(client_addr))) 
    { 
        printf("Client Bind Port Failed!n");  
        exit(1); 
    } 
       
    //设置一个socket地址结构server_addr,代表服务器的internet地址, 端口  
    structsockaddr_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) //服务器的IP地址来自程序的参数 
    { 
        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); 
    //向服务器发起连接,连接成功后client_socket代表了客户机和服务器的一个socket连接 
    if(connect(client_socket,(structsockaddr*)&server_addr, server_addr_length) < 0)  
    { 
        printf("Can Not Connect To %s!n",argv[1]); 
        exit(1); 
    } 
       
    charfile_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);  
           
    charbuffer[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 
    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 Writen", file_name);  
        exit(1); 
    } 
           
    //从服务器接收数据到buffer中 
    bzero(buffer,BUFFER_SIZE); 
    intlength = 0;  
    while( length = recv(client_socket,buffer,BUFFER_SIZE,0))       //循环接收，再写到文件 
    { 
        if(length < 0)  
        { 
            printf("Recieve Data From Server %s Failed!n", argv[1]);  
            break; 
        } 
//        int write_length = write(fp, buffer,length);  
        intwrite_length = fwrite(buffer,sizeof(char),length,fp); 
        if(write_length<length)  
        { 
            printf("File:t%s Write Failedn", file_name);  
            break; 
        } 
        bzero(buffer,BUFFER_SIZE);     
    } 
    printf("Recieve File:t %s From Server[%s] Finishedn",file_name, argv[1]);  
           
    close(fp); 
    //关闭socket 
    close(client_socket); 
    return0;  
}

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