网络基础—socket编程（2）-----基于UDP的客户端和服务器端的实现

基于UDP的socket 服务端和客户端实现

——服务端

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define SERVER_PORT 7890 
#define MAX_MSG_SIZE 1024 


int main(void) 
{ 
    int sockfd; 
    struct sockaddr_in addr; 

    sockfd=socket(AF_INET,SOCK_DGRAM,0); 

    bzero(&addr,sizeof(struct sockaddr_in)); // 初始化,置0
    addr.sin_family=AF_INET; // Internet
    addr.sin_addr.s_addr=htonl(INADDR_ANY); 
    //addr.sin_addr.s_addr=inet_addr("127.0.0.1"); 
    addr.sin_port=htons(SERVER_PORT); 

    int ret = bind(sockfd,(struct sockaddr *)&addr,sizeof(struct sockaddr_in)); 


    struct sockaddr_in client_addr; 
    int addrlen,n; 
    char msg[MAX_MSG_SIZE]; 

    while(1) 
    {   
        bzero(msg,sizeof(msg)); // 初始化,清零
        addrlen = sizeof(struct sockaddr); 
        n=recvfrom(sockfd,msg,MAX_MSG_SIZE,0,(struct sockaddr*)&client_addr,&addrlen); // 从客户端接收消息
        msg[n]=0; 
        fprintf(stdout,"Server received %s",msg); // 显示消息
    } 

    close(sockfd); 
}

——客户端

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 

#define SERVER_PORT 7890 
#define MAX_BUF_SIZE 1024 


int main(int argc,char **argv) 
{ 
    int sockfd; 
    struct sockaddr_in addr; 

    sockfd=socket(AF_INET,SOCK_DGRAM,0); 

    bzero(&addr,sizeof(struct sockaddr_in)); // 初始化,置0
    addr.sin_family=AF_INET; // Internet
    addr.sin_port=htons(SERVER_PORT);
    int ret = inet_aton(argv[1],&addr.sin_addr); 


    char buffer[MAX_BUF_SIZE]; 
    int n; 
    while(1) 
    {   
        fgets(buffer,MAX_BUF_SIZE,stdin); 
        struct sockadd_int *t_addr = &addr;
        sendto(sockfd,buffer,strlen(buffer),0,(struct sockaddr*)t_addr,sizeof(struct sockaddr_in)); 
        bzero(buffer,MAX_BUF_SIZE); 
    } 

    close(sockfd); 
}