Linux基于TCP/IP简单的客户端、服务器通信程序实例

服务器端代码：

/*************************************************************************
	> File Name: server.c
	> Author: fucang_zxx
	> Mail: [email protected] 
	> Created Time: Sun 24 Jul 2016 03:45:21 PM CST
 ************************************************************************/

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

const int port = 8080;
const char* ip = "192.168.64.128"; 

int main()
{
	  //创建套接字,即创建socket 
	  int ser_sock = socket(AF_INET, SOCK_STREAM, 0); 
	  if(ser_sock < 0)
	  {
		  //创建失败
		  perror("socket");
		  return 1;
	  }

	  //绑定信息，即命名socket 
	  struct sockaddr_in addr; 
	  addr.sin_family = AF_INET; 
	  addr.sin_port = htons(port); 
	  //inet_addr函数将用点分十进制字符串表示的IPv4地址转化为用网络 
 	  //字节序整数表示的IPv4地址 
	  addr.sin_addr.s_addr = inet_addr(ip); 
	  if(bind(ser_sock, (struct sockaddr*)&addr, sizeof(addr)) < 0) 
	  {	            
    	   //命名失败 
	       perror("bind"); 
	       return 2; 	   
	  } 

	  //监听socket
	  int listen_sock = listen(ser_sock, 5);
	  if(listen_sock < 0)
	  {
		  //监听失败
		  perror("listen");
		  return 3;
	  }

      //接受连接
	  //系统调用从listen监听队列中接受一个连接
	  //int accept(int sockfd, struct sockaddr* addr, socklen_t* addrlen)
	  //sockfd参数是执行过listen系统调用的监听socket；addr参数用来获取被
	  //接受连接的远端socket地址，该socket地址的长度由addrlen参数指出
	  //accept成功时返回一个新的连接socket，该socket唯一的标识了被接受
	  //的这个连接，服务器可通过读写该socket来与被接受连接对应的客户端通信
	  struct sockaddr_in peer;
	  socklen_t peer_len;
	  char buf[1024];
	  int accept_fd = accept(ser_sock, (struct sockaddr*)&peer, &peer_len);

	  if(accept_fd < 0)
	  {
		  perror("accept");
		  return 4;
	  }
	  else
	  {
		  printf("connected with ip: %s  and port: %d\n", inet_ntop(AF_INET,&peer.sin_addr, buf, 1024), ntohs(peer.sin_port));
		
	  }

	  while(1)
	  {
		  memset(buf, '\0', sizeof(buf));
		  ssize_t size = read(accept_fd, buf, sizeof(buf) - 1);
	//	  printf("size = %d\n", size);
	//	  printf("buf = %s\n", buf);
		  if(size > 0)
		  {
			  printf("client#: %s\n", buf);
		  }
		  else if(size == 0)
		  {
			  printf("read is done...\n");
			  break;
		  }
		  else 
		  {
			  perror("read");
			  break;
		  }
          printf("server please enter: ");
		  fflush(stdout);
          size = read(0, buf, sizeof(buf) - 1);
		  if(size > 0)
		  {
			  buf[size - 1] = '\0';
		  }
		  else if(size == 0)
		  {
			  printf("read is done...\n");
			  break;
		  }
		  else
		  {
			  perror("read");
			  break;
		  }	  
		  write(accept_fd, buf, strlen(buf));
	  }
		close(ser_sock);
	  return 0;
}

客户端代码：

/*************************************************************************
	> File Name: client.c
	> Author: fucang_zxx
	> Mail: [email protected] 
	> Created Time: Sun 24 Jul 2016 03:45:21 PM CST
 ************************************************************************/

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

const int port = 8080;
const char* ip = "192.168.64.128"; 

int main()
{
	  //创建套接字,即创建socket 
	  int clt_sock = socket(AF_INET, SOCK_STREAM, 0); 
	  if(clt_sock < 0)
	  {
		  //创建失败
		  perror("socket");
		  return 1;
	  }

	  //绑定信息，即命名socket 
	  struct sockaddr_in addr; 
	  addr.sin_family = AF_INET; 
	  addr.sin_port = htons(port); 
	  //inet_addr函数将用点分十进制字符串表示的IPv4地址转化为用网络 
 	  //字节序整数表示的IPv4地址 
	  addr.sin_addr.s_addr = inet_addr(ip); 

	  //不需要监听

	  //发起连接
//	  struct sockaddr_in peer;
	  socklen_t addr_len = sizeof(addr);
	  int connect_fd = connect(clt_sock, (struct sockaddr*)&addr, addr_len);
	  if(connect_fd < 0)
	  {
		  perror("connect");
		  return 2;
	  }
	  char buf[1024];

	  while(1)
	  {
		  memset(buf, '\0', sizeof(buf));
		  printf("client please enter: ");
		  fflush(stdout);
		  ssize_t size = read(0, buf, sizeof(buf) - 1);
		  if(size > 0)
		  {
			  buf[size - 1] = '\0';
		  }
		  else if(size == 0)
		  {
			  printf("read is done...\n");
			  break;
		  }
		  else
		  {
			  perror("read");
			  return 4;
		  }
		 // printf("client: %s\n", buf);
          write(clt_sock, buf, strlen(buf));
		  size = read(clt_sock, buf, sizeof(buf));
		  if(size > 0)
		  {
		 	  buf[size] = '\0';
		  }
		  else if(size == 0)
		  {
			  printf("read is done...\n");
			  break;
		  }
		  else 
		  {
			  perror("read");
			  return 5;
		  }
		  printf("server: %s\n", buf);
	   }
	  close(clt_sock);
	  return 0;
}

运行截图：

客户端：

服务器端：