Question

我试图制作一个简单的客户端服务器（带有一些gui），服务器发送数据并且客户端接收它（文件的保存也起作用）但是客户端似乎被卡在接收循环中。我用“.start（）”开始了两个线程。我用粗体标记了问题的位置。

我的一些人知道为什么客户端的程序不会继续... - 祝福ghali

服务器：

public class Server extends Thread implements Runnable{

    public File choosenfile;
    public int port = 42001;
    public boolean running = true;
    public String myAdress = "localhost";
    public ServerSocket serverSocket;
    public BufferedInputStream bis;
    public boolean debug = true;

    public OutputStream os;


    public void run() {


        try {
            serverSocket = new ServerSocket(port);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        while(running){

            Socket socket = null;


            try {
                System.out.println("Listening on port: "+port);
                socket = serverSocket.accept();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            /*
             * Dies ist die stelle an der man einen Thread aufmachen kann
             */


            // 1. File-Hülle anlegen dazu muss man deren größere wissen
            if(debug) System.out.println("Server: 1.");



            int count;
            byte[] buffer = new byte[1024];

            try {

                os = socket.getOutputStream();

            } catch (IOException e1) {
                e1.printStackTrace();
            }


            BufferedInputStream in = null;

            try {

                in = new BufferedInputStream(new FileInputStream(choosenfile));

            } catch (FileNotFoundException e1) {
                e1.printStackTrace();
            }

            try {
                    while ((count = in.read(buffer)) > 0) {
                         os.write(buffer, 0, count);
                         os.flush();
                    }

            } catch (IOException e1) {
                e1.printStackTrace();
            }


             if(debug) System.out.println("Server: finish sending");

              try {
                os.flush();
                 if(debug) System.out.println("Server: close");
                serverSocket.close();
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            running =false;
        }

    }

}

客户端：

public class Client extends Thread implements Runnable{
    public Gui gui; //graphical surface
    public boolean running = true;
    public boolean debug =true;

    //Networkstuff

    Socket socket;
    DataInputStream is;
    public byte[] returnFile;

    public Client(Gui gui){
        this.gui = gui;

    }

    public void run() {


        try {
            socket = new               Socket(InetAddress.getByName(gui.inetAdress),gui.portServer);
        } catch (UnknownHostException e2) {
            // TODO Auto-generated catch block
            e2.printStackTrace();
        } catch (IOException e2) {
            // TODO Auto-generated catch block
            e2.printStackTrace();
        }


        FileOutputStream fos = null;

        try {
            fos = new FileOutputStream(gui.path);
        } catch (FileNotFoundException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

        BufferedOutputStream out = new BufferedOutputStream(fos);
        byte[] buffer = new byte[1024];

        int count;
        InputStream in = null;

        try {

            in = socket.getInputStream();
            int i =0;

        }
        catch (IOException e1) {
        e1.printStackTrace();
        }


            try {
                while((count=in.read(buffer)) >0){
                    fos.write(buffer, 0, count);

                }
            } catch (IOException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }



        **//folloing functions are not executed anymore and i dont know why**
        gui.loadPicture();



        try {
            fos.close();
            socket.close();
        } catch (IOException e1) {
            // TODO Auto-generated catch block
            e1.printStackTrace();
        }

    }

}

Answer 1

这很简单。 read()阻止

数据在流中可用，或
关闭了流

服务器向流发送字节，但从不关闭它，因此从该流读取的客户端无法知道是否会有更多数据进入，因此它会阻塞。

在服务器端关闭流，或设计一个允许客户端知道何时停止读取的协议（例如，发送文件中的字节数，然后发送这些字节）。

Java网络客户端 - 服务器（文件发送），卡在客户端接收循环中

1 个答案: