功能描述

利用UDP网络通信实现客户端和服务器的通信
服务器代码
server.c

#include<stdio.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<string.h>
#include<unistd.h>
#include<netinet/in.h>
#include <arpa/inet.h>


//创建UDP实现服务器和客户端的通信

int main()
{
//创建socket连接
	int serfd=0;
	serfd=socket(AF_INET,SOCK_DGRAM,0);
	if(serfd<0)
	{
		perror("socke failed");
		return -1;
	}
	printf("socket success\n");
//绑定IP地址和端口信息
	int ret=0;
	struct sockaddr_in seraddr={0};
	seraddr.sin_family=AF_INET;
	seraddr.sin_addr.s_addr=inet_addr("192.168.59.131");
	seraddr.sin_port=htons(8888);
	
	ret=bind(serfd,(struct sockaddr *)&seraddr,sizeof(seraddr));
	if(ret<0)
	{
		perror("bind failed");
		close(serfd);
		return -1;
	}
	printf("bind success\n");
//接收发送自客户端的消息
while(1)
{
	int addrlen=0;
	char buf[1024]={0};
	struct sockaddr_in clientaddr={0};
	addrlen=sizeof(clientaddr);
	ret=recvfrom(serfd,buf,sizeof(buf),0,(struct sockaddr *)&clientaddr,&addrlen);
	if(ret<0)
	{
		perror("recvfrom failed");
		close(serfd);
		return -1;
	}
	printf("IP=%s,port=%u\n",inet_ntoa(clientaddr.sin_addr),ntohs(clientaddr.sin_port));
	printf("recvfrom success\n");
	printf("receive:  %s\n",buf);
//向客户端发送消息	
	memset(buf,0,sizeof(buf));
	gets(buf);
	ret=sendto(serfd,buf,strlen(buf),0,(struct sockaddr *)&clientaddr,addrlen);
	if(ret<0)
	{
		perror("sendto failed");
		close(serfd);
		return -1;
	}
	printf("sendto success\n");
}
	close(serfd);
	return 0;
}

客户端代码
client.c

#include<stdio.h>
#include<sys/socket.h>
#include<sys/types.h>
#include<string.h>
#include<unistd.h>
#include<netinet/in.h>
#include <arpa/inet.h>



//创建UDP实现服务器和客户端的通信
//创建socket连接
int main()
{
//创建socket连接
	int clifd=0;
	clifd=socket(AF_INET,SOCK_DGRAM,0);
	if(clifd<0)
	{
		perror("socke failed");
		return -1;
	}
	printf("socket success\n");
//向服务器发送消息
while(1)
{
	int tolen=0;
	int ret=0;
	char buf[1024]={0};
	gets(buf);
	
	struct sockaddr_in seraddr={0};
	seraddr.sin_family=AF_INET;
	seraddr.sin_addr.s_addr=inet_addr("192.168.59.131");
	seraddr.sin_port=htons(8888);
	tolen=sizeof(seraddr);
	ret=sendto(clifd,buf,strlen(buf),0,(struct sockaddr *)&seraddr,tolen);
	if(ret<0)
	{
		perror("sendto failed");
		close(clifd);
		return -1;
	}
	printf("sendto success\n");
//接收发送自服务器的消息	
	ret=recvfrom(clifd,buf,sizeof(buf),0,NULL,NULL);
	if(ret<0)
	{
		perror("recvfrom failed");
		close(clifd);
		return -1;
	}
	printf("recvfrom success\n");
	printf("receive:  %s\n",buf);
}
	close(clifd);
		
	return 0;
}