android局域网通信(三)

来源：互联网发布：蜀山战纪网络结局编辑：程序博客网时间：2024/05/02 04:45

上一篇文章通过客户端通过广播获取了服务器的IP,有了IP之后，就可以通过Socket去连接服务器了

服务器监听端口

/*** * 打开一个socket,开始监听 */JNIEXPORT jint JNICALL Java_com_example_jnisocketserver_SocketServer_open  (JNIEnv * env, jobject arg){int server_sockfd;int client_sockfd;int len;struct sockaddr_in my_addr;struct sockaddr_in remote_addr;int sin_size;char buf[1024];memset(&my_addr,0,sizeof(my_addr));my_addr.sin_family=AF_INET;my_addr.sin_addr.s_addr=INADDR_ANY;my_addr.sin_port=htons(8880);if((server_sockfd = socket(PF_INET,SOCK_STREAM,0))<0){ LOGD("bind socket error: %s",strerror(errno)); return 1;}    /*将套接字绑定到服务器的网络地址上*/    if (bind(server_sockfd,(struct sockaddr *)&my_addr,sizeof(struct sockaddr))<0)    {     LOGD("bind socket error2: %s",strerror(errno));     return 2;    }    /*监听连接请求--监听队列长度为5*/    listen(server_sockfd,5);    sin_size=sizeof(struct sockaddr_in);    /*等待客户端连接请求到达*/    if((client_sockfd=accept(server_sockfd,(struct sockaddr *)&remote_addr,&sin_size))<0)    {      LOGD("error3");    }    LOGD("accept client %s",inet_ntoa(remote_addr.sin_addr));    len=send(client_sockfd,"Welcome to my server",21,0);//发送欢迎信息    /*接收客户端的数据并将其发送给客户端--recv返回接收到的字节数，send返回发送的字节数*/    while((len=recv(client_sockfd,buf,BUFSIZ,0))>0)    {        buf[len]='\0';        LOGD("%s",buf);        jclass provider = (*env)->FindClass(env,"com/example/jnisocketserver/SocketServer");        if(provider == 0)        LOGD("find class error");jmethodID getMsg = (*env)->GetMethodID(env,provider,"getMsg","(Ljava/lang/String;)V");if(getMsg==0)LOGD("find method error");LOGD("method id = %d",getMsg);(*env)->CallVoidMethod(env,arg,getMsg,stoJstring(env,buf));    }    close(client_sockfd);    close(server_sockfd);return 3;}

客户端去连接这个socket

/** * socket连接 */JNIEXPORT jint JNICALL Java_com_example_jnisocket_SocketUtil_connet  (JNIEnv *env, jclass arg, jstring ip, jint port){ LOGD("ip1=%s",jstringTostring(env,ip));  char* ipstr = jstringTostring(env,ip);int recbytes;int len;char buffer[1024]={0};struct sockaddr_in s_add,c_add;int portnum = 8880;localsocket = socket(AF_INET, SOCK_STREAM, 0);if(-1 == localsocket){LOGD("error");}bzero(&s_add,sizeof(struct sockaddr_in));LOGD("#######step2");s_add.sin_family=AF_INET;s_add.sin_addr.s_addr=inet_addr(ipstr);s_add.sin_port=htons(port);LOGD("s_addr = %#x ,port : %#x\r\n",s_add.sin_addr.s_addr,s_add.sin_port);if(-1 ==connect(localsocket,(struct socketaddr *)(&s_add),sizeof(struct sockaddr))){LOGD("error1 %s",strerror(errno));}//LOGD("#######connected to server");//len = recv(localsocket,buffer,1024,0);//buffer[len]='\0';//LOGD("######%s",buffer);////while(1)//{//char buff[] = "ss";//len = send(localsocket,buff,strlen(buff),0);//len = recv(localsocket,buff,1024,0);//buff[len]='\0';//LOGD("#####receive:%s",buff);//}//close(localsocket);return 1;}

好了，大工告成，基本的通信已经可以实现了，而且由于是用c写的，所以可以实现跨平台操作，但是还有些细节需要优化，比如断线重连，端口被占用之后的处理等待

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