Question

我通过C中的客户端通过套接字发送行，并使用Java在服务器上读取。我能管理的最好的是客户端发送多行，当我关闭客户端时，服务器将所有数据打印在一行中。或者让它发送然后接收等等。我的愿望是C应用程序在循环中发送“Hi”，并且Java文件首先捕获，打印然后捕获第二个并打印。现在它打印“HiHiHiHi ...”，但仅在连接终止时才会打印。

我使用oracle socket example作为指导，并使用另一个guide作为C客户端

因此，在Java中读取套接字是：

try {
        ServerSocket serverSocket = null;
        try {
            serverSocket = new ServerSocket(port);
        } catch (IOException e) {
            System.err.println("Could not listen on port: 4444.");
            System.exit(1);
        }
        Socket clientSocket = null;
        try {
            clientSocket = serverSocket.accept();
            System.out.println("Connected with client");
        } catch (IOException e) {
            System.err.println("Accept failed.");
            System.exit(1);
        }
        out = new PrintWriter(clientSocket.getOutputStream(), true);
        BufferedReader in = new BufferedReader(new InputStreamReader(clientSocket.getInputStream()));
        String inputLine;

        while ((inputLine = in.readLine()) != null) {
            System.out.println("RECEIVING " + inputLine);
        }
        out.close();
        in.close();
        clientSocket.close();
        serverSocket.close();
    } catch (IOException ex) {
        Logger.getLogger(Connection.class.getName()).log(Level.SEVERE, null, ex);
    } finally {
        out.close();
    }

尝试在while循环中写入套接字C：

中的相同字符串

void connection(void) {
    int sockfd, portno;
    struct sockaddr_in serv_addr;
    struct hostent *server;

    /* Set time limit. */
    timeout.tv_sec = 0;
    timeout.tv_usec = 10;

    portno = 4444;
    sockfd = socket(AF_INET, SOCK_STREAM, 0);

    if (sockfd < 0) 
        error("ERROR opening socket");
    server = gethostbyname("Localhost");
    if (server == NULL) {
        fprintf(stderr,"ERROR, no such host\n");
        exit(0);
    }
    bzero((char *) &serv_addr, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    bcopy((char *)server->h_addr, 
         (char *)&serv_addr.sin_addr.s_addr,
         server->h_length);
    serv_addr.sin_port = htons(portno);
    if (connect(sockfd,(struct sockaddr *)&serv_addr,sizeof(serv_addr)) < 0) 
        error("ERROR connecting");
    while(1)    {
        /* Create a descriptor set containing our two sockets.  */
        FD_ZERO(&fds);
        FD_SET(sockfd, &fds);
        rc = select(sizeof(fds)*8, &fds, NULL, NULL, &timeout);
        if (rc==-1) {
            perror("select failed");
        }
            bzero(buffer,256);
            char *buffer2 = "here";

            n = write(sockfd,buffer2,strlen(buffer2));
            if (n < 0) 
                 error("ERROR writing to socket");

    }
}

Answer 1

您的服务器在打印任何内容之前正在等待\ n。

您的客户未发送任何\ n字符。

您可以尝试：

char *buffer2 = "here"\n;

从套接字逐行读取

1 个答案: