Linux_C使用TCP实现群聊功能

大二下学期的Linux高级编程作业,比较简单,本文章仅提供代码,仅供参考,挂科模式启动~
题目要求:

  • 要求实现一个聊天室程序,至少三个客户端可以同时进入聊天室;
  • 服务器程序有日志记录功能,日志中记录每个客户端接入的时间和IP地址

TCP服务器端代码:

//serve.c		//服务器端代码
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#define MAXSIZE 128

char news[MAXSIZE];
int res;							//用以接收函数返回值

void* pthread_chat(void * arg)		//创建线程用以接收数据
{
      int confd = *(int *)arg;
      while(1)
      {
          res  = recv(confd, news, sizeof(news), 0);
          if(res <= 0)
          {
			  perror("recv");
              break;
          }
          printf("The news is: %s\n",news);
		  memset(news,0,MAXSIZE);
		  send(confd,"OK",2,0);
      }

      printf("One client over\n");
      close(confd);
}

char *Time()					//获取当前时间
{
	time_t timer;
	struct tm *tblock;
	timer = time(NULL);
	tblock = localtime(&timer);
	return asctime(tblock);
}

void save(char *s)				//储存日志文件
{
	int fd;
	fd = open("journal",O_RDWR|O_APPEND|O_CREAT);

	if(fd < 0)
	perror("open");
	else
	{
	char *buf = Time();
	strcat(buf,s);
		
	write(fd,buf,MAXSIZE);
	write(fd,"\n",2);
	lseek(fd,0,SEEK_END);
	if(res < 0)
	perror("write");
	}
}

int main()
{
      int sockfd = socket(AF_INET, SOCK_STREAM, 0);
      struct sockaddr_in saddr, caddr;
      saddr.sin_family = AF_INET;
      saddr.sin_port = htons(6666);
      saddr.sin_addr.s_addr = inet_addr("127.0.0.1");
  
      res = bind(sockfd,(struct sockaddr*)&saddr, sizeof(saddr));
      if(res < 0)
		perror("bind");

	 listen(sockfd, 5);			//监听端口

      while(1)
      {
          int len = sizeof(caddr);
          int confd = accept(sockfd,(struct sockaddr*)&caddr, &len);
          if(confd < 0)
		{
			perror("accept");
              continue;
          }
		else
		{
			save(inet_ntoa(caddr.sin_addr));
		}

		printf("Accept confdis:%d, ip=%s\n",
		confd,inet_ntoa(caddr.sin_addr));

          pthread_t tid;
          pthread_create(&tid, NULL, pthread_chat, &confd);
    }
}

客户端代码如下:

//client.c	//客户端代码
#include 
#include 
#include 
#include 
#include 
#include 
#include   
#define MAXSIZE 128

char news[MAXSIZE];
int res;					//用来接收函数返回值
int main()
{
	printf("------Welcome join the chat room-----\n");
	printf("If you want to quit,please input --bye--\n");
    int sockfd = socket(AF_INET, SOCK_STREAM, 0);
      
	struct sockaddr_in saddr;
    saddr.sin_family = AF_INET;
    saddr.sin_port = htons(6666);
	saddr.sin_addr.s_addr = inet_addr("127.0.0.1");
  
    int confd = connect(sockfd,(struct sockaddr*)&saddr,sizeof(saddr));
    if(confd < 0)
		perror("connect");
	while(1)
    {
          printf("Please input the news\n");
          fgets(news,MAXSIZE,stdin);
          
		  if(strncmp(news,"bye",3) == 0)
          {
              break;
          }

          send(sockfd, news, strlen(news), 0);
          memset(news,0,MAXSIZE);
		  recv(sockfd, news, sizeof(news), 0);
          printf("The serve's news is: %s\n",news);
      }

        close(sockfd);
		exit(0);
}

程序操作方法:(编译程序时需要添加-lpthread参数)

  1. 在终端运行服务器程序
  2. 新建终端(多个终端)运行客户端程序
  3. 在客户端/服务器输入数据,消息可显示
  4. 客户端输入bye之后断开与服务器的连接
  5. 关闭服务器程序之后可查看日志文件

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