虽然是做android开发，但网络通信这块还是习惯用C语言来实现，主要有如下原因：
1，不利于封装命令请求
2，写好这个模块后，通过JNI调用很是方便，复用也方便
1 const char* connectTrafficData(const char* cmd) { 2 LOGD("-----------connectTrafficData-------------"); 3 int length; 4 int sockfd; 5 int len; 6 struct sockaddr_in address; 7 int result; 8 char httpstring[1024] = {0}; 9 char response[1024] = {0}; 10 11 strcpy(httpstring,cmd); 12 strcat(httpstring," "); 13 sockfd = socket(AF_INET, SOCK_STREAM, 0); 14 address.sin_family = AF_INET; 15 address.sin_addr.s_addr = inet_addr("127.0.0.1"); 16 address.sin_port = htons(23633); 17 len = sizeof(address); 18 19 struct timeval timeout={2,0}; 20 setsockopt(sockfd,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,sizeof(struct timeval)); 21 22 result = connect(sockfd,(struct sockaddr *)&address,len); 23 if(result == -1){ 24 LOGD("connect_result=-1"); 25 strcpy(response,"-1"); 26 close(sockfd); 27 28 } 29 30 if ( send(sockfd,httpstring,strlen(httpstring),0) < 0 ) { 31 LOGD("send response failed. "); 32 strcpy(response,"-1"); 33 close(sockfd); 34 35 } 36 37 length = recv(sockfd,response,MAXSIZE,0); 38 if (length < 0) { 39 40 LOGD(" recv_length < 0 "); 41 strcpy(response,"-1"); 42 close(sockfd); 43 44 }else{ 45 46 LOGD(response); 47 48 } 49 return response; 50 }