linux下C实现客户端服务器通信框架

来源：互联网发布：股市九宫图软件编辑：程序博客网时间：2024/06/04 11:54

服务器端

首先等候客户连接请求，一旦连接成功则接受客户端发送过来的字符，采用带有头结点的链表方式存贮字符，每个结点存储一个字符，接着通过对链表实现插入删除操作，完成对字符的升序排序，最后将排序后字符发送给客户端。

客户端

首先与服务器相连，接着发送客户端名字，然后发送客户信息，接受到服务器发送来排序结果并且显示。

服务器端代码：server.c

#include <sys/types.h>      #include <sys/socket.h>      #include <stdio.h>      #include <netinet/in.h>      #include <arpa/inet.h>      #include <unistd.h>      #include <stdlib.h>      #include <malloc.h>struct LNode  {      char data;      struct LNode *next;  };    //按升序创建链表,count为创建的链表的节点数目  struct LNode *create(int count,char cdata[])  {      int i=0;      struct LNode *pNode = NULL;      struct LNode *pNewNode = NULL;      struct LNode *head = NULL;       head = (struct LNode*)malloc(sizeof(struct LNode));  head->next= NULL;    for(i =0;i <count;i++)      {          pNewNode = (struct LNode*)malloc(sizeof(struct LNode));//分配节点空间         pNewNode->data=cdata[i]; pNewNode->next=NULL;        if(head->next == NULL)    //指定头结点          {              head->next= pNewNode;           //   pNode = pNewNode;          }      else   //有序插入{pNode=head;while(pNode->next!=NULL&&pNode->next->data<pNewNode->data){pNode=pNode->next;}pNewNode->next=pNode->next;pNode->next=pNewNode;}    }  return head;     }     int main()      {          int server_sockfd,client_sockfd;          int server_len,client_len;          struct sockaddr_in server_address;          struct sockaddr_in client_address;          int i,btye,j=0;          int rleng=0,sleng=0;        char char_recv[100],char_send[100];     struct LNode *node,*p;          server_address.sin_family = AF_INET;          server_address.sin_addr.s_addr = inet_addr("127.0.0.1");          server_address.sin_port = 8080;          server_len = sizeof(server_address);                    server_sockfd = socket(AF_INET,SOCK_STREAM,0);                    bind(server_sockfd,(struct sockaddr *)&server_address,server_len);                    listen(server_sockfd,5);          printf("server waiting for connect\n");                    client_len = sizeof(client_address);          client_sockfd = accept(server_sockfd,(struct sockaddr *)&client_address,(socklen_t *)&client_len);                  if(btye = recv(client_sockfd,&rleng,1,0) == -1)  //收长度        {              perror("recvleng");              exit(EXIT_FAILURE);          }          if(btye = recv(client_sockfd,&char_recv,rleng,0) == -1)  //收数据        {              perror("recv");              exit(EXIT_FAILURE);          }               printf("receive from client is:");while(j<rleng){//char_send[j]=char_recv[j];        printf("%c",char_recv[j++]);       }     printf("\n");node = create(rleng,char_recv);  //处理发送数据j=0;p=node->next;while(p){       char_send[j++]=p->data;         p=p->next;   }     sleng=j+1;      if(btye = send(client_sockfd,&sleng,1,0) == -1)  //发长度        {              perror("sendleng");              exit(EXIT_FAILURE);          }          if(btye = send(client_sockfd,&char_send,sleng,0) == -1)  //发数据        {              perror("send");              exit(EXIT_FAILURE);          }          shutdown(client_sockfd,2);          shutdown(server_sockfd,2);           return 0;      }

客户端代码：client.c

#include <sys/types.h>      #include <sys/socket.h>      #include <stdio.h>      #include <netinet/in.h>      #include <arpa/inet.h>      #include <unistd.h>      #include <stdlib.h>      int main()      {          int sockfd;          int len;          struct sockaddr_in address;          int result;          int i,byte,j=0;            int rleng=0,sleng=0;  char char_recv[100],char_send[100];         if((sockfd = socket(AF_INET,SOCK_STREAM,0)) == -1)  //socket套接字        {              perror("socket");              exit(EXIT_FAILURE);          }          address.sin_family = AF_INET;          address.sin_addr.s_addr = inet_addr("127.0.0.1");          address.sin_port = 8080;          len = sizeof(address);          if((result = connect(sockfd,(struct sockaddr *)&address,len)) == -1)  //建立链接        {              perror("connect");              exit(EXIT_FAILURE);          }               printf("please enter the context you want to send to server and the end of !:");   while(j<100 && char_send[j-1]!='!'){  //输入        scanf("%c",&char_send[j++]);          }                   sleng=j-1;      if(byte = send(sockfd,&sleng,1,0) == -1)  //发长度        {              perror("sendleng");              exit(EXIT_FAILURE);          }          if(byte = send(sockfd,&char_send,sleng,0) == -1)  //发数据        {              perror("send");              exit(EXIT_FAILURE);          }          if(byte = recv(sockfd,&rleng,1,0) == -1)  //收长度        {              perror("recv");              exit(EXIT_FAILURE);          }        if(byte = recv(sockfd,&char_recv,rleng,0) == -1)  //收数据        {              perror("recv");              exit(EXIT_FAILURE);          }         printf("receive from server is:");j=0;while(j<rleng){        printf("%c",char_recv[j++]);       }     printf("\n");        close(sockfd);  //断开链接        exit(0);      }

实验操作如图所示，先打开两个终端分别编译，就能进行相互通信了。

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