C语言 ---- TCP服务端与客户端 ---- 实现回写的简单代码

最新推荐文章于 2025-12-15 14:35:34 发布

原创最新推荐文章于 2025-12-15 14:35:34 发布 · 167 阅读

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#tcp/ip #java #网络

服务端

服务端流程：
1.创建socket套接字
2.给这个socket绑定一个端口号
3.给这个socket开启监听属性 -- 这个socket只能用来接收连接
4.等待客户端连接
5.开始通讯
6.关闭连接

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define PORT 8080
#define BUFFER_SIZE 1024
#define ADDR "127.0.0.1"

int main(void)
{
    //创建套接字
    int service_fd = socket(AF_INET,SOCK_STREAM,0);
    if(service_fd == -1) return -1;

    //为套接字绑定一个端口
    struct sockaddr_in local = {0};
    local.sin_addr.s_addr = htons(INADDR_ANY);
    local.sin_family = AF_INET;
    local.sin_port = htons(PORT);
    int ret = bind(service_fd,(struct sockaddr*)&local,sizeof(local));
    if(ret == -1) return -1;

    //给socket开启监听属性
    ret = listen(service_fd,10);
    if(ret == -1)
    {
        close(service_fd);
        return -1;
    }

    //等待客户端连接
    while(1)
    {
        int client_fd = accept(service_fd,NULL,NULL);
        if(client_fd == -1) continue;
        while(1)
        {
            char buffer[BUFFER_SIZE] = {0};
            int stat = recv(client_fd,buffer,sizeof(buffer),0);
            if(stat <= 0) break;
            printf("%s\n",buffer);
            send(client_fd,buffer,strlen(buffer),0);
        }
        close(client_fd);
    }

    return 0;
}

客户端

客户端流程:
   1.创建socket套接字
   2.连接服务器
   3.开始通讯
   4.关闭连接

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>

#define PORT 8080
#define BUFFER_SIZE 1024
#define ADDR "127.0.0.1"

int main(void)
{
    //创建套接字
    int client_fd = socket(AF_INET,SOCK_STREAM,0);
    if(client_fd == -1) return -1;

    //连接服务器
    struct sockaddr_in target;
    target.sin_addr.s_addr = inet_addr("127.0.0.1");
    target.sin_family = AF_INET;
    target.sin_port = htons(PORT);
    int connect_stat = connect(client_fd,(struct sockaddr*)&target,sizeof(target));
    if(connect_stat == -1)
    {
        close(client_fd);
        return -1;;
    } 

    //开始通信
    while(1)
    {
        char send_buff[BUFFER_SIZE] = {0};
        scanf("%s",send_buff);
        send(client_fd,send_buff,strlen(send_buff),0);

        char receive_buff[BUFFER_SIZE] = {0};
        recv(client_fd,receive_buff,sizeof(receive_buff),0);
        printf("%s\n",receive_buff);

    }
    close(client_fd);


    return 0;
}