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c 保存文件到服务器端

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行业动态
2025-02-14
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c 语言保存文件到服务器端需用网络编程技术。

在C语言中，将文件保存到服务器端通常涉及网络编程的概念，这需要使用套接字（Socket）进行客户端与服务器之间的通信，以下是一个简单的示例，展示了如何在C语言中实现将文件从客户端上传到服务器端并保存。

服务器端代码

服务器端需要监听一个端口，等待客户端的连接请求，接收文件数据，并将其保存到服务器的文件系统中。

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <unistd.h>
#define PORT 8080
#define BUFFER_SIZE 1024
int main() {
    int server_fd, new_socket;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[BUFFER_SIZE] = {0};
    char *filename = "received_file.txt";
    FILE *fp;
    // 创建套接字文件描述符
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }
    // 强制绑定套接字到端口8080
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);
    if (bind(server_fd, (struct sockaddr *)&address, sizeof(address))<0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }
    if ((new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen))<0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }
    // 打开文件以写入数据
    fp = fopen(filename, "wb");
    if (fp == NULL) {
        perror("File open error");
        exit(EXIT_FAILURE);
    }
    int valread;
    while ((valread = read(new_socket, buffer, BUFFER_SIZE)) > 0) {
        fwrite(buffer, sizeof(char), valread, fp);
    }
    printf("File received and saved as %s
", filename);
    fclose(fp);
    close(new_socket);
    close(server_fd);
    return 0;
}

客户端代码

客户端需要连接到服务器，并发送文件数据。

#include <stdio.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#define PORT 8080
#define BUFFER_SIZE 1024
int main() {
    struct sockaddr_in serv_addr;
    int sock = 0;
    char *filename = "send.txt";
    char buffer[BUFFER_SIZE] = {0};
    FILE *fp;
    if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        printf("
 Socket creation error 
");
        return -1;
    }
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_port = htons(PORT);
    if(inet_pton(AF_INET, "127.0.0.1", &serv_addr.sin_addr)<=0) {
        printf("
Invalid address/ Address not supported 
");
        return -1;
    }
    if (connect(sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        printf("
Connection Failed 
");
        return -1;
    }
    fp = fopen(filename, "rb");
    if (fp == NULL) {
        perror("File open error");
        return -1;
    }
    int n;
    while ((n = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0) {
        send(sock, buffer, n, 0);
    }
    printf("File data sent successfully.
");
    fclose(fp);
    close(sock);
    return 0;
}