java - for循环未收到完整数据

Question

我遇到的问题是我的程序卡在 for 循环中，因为 dataInputSteam 在 DataOutputSteam 完成之前没有接收到所有数据。在我的程序中，我想向服务器发送屏幕截图，客户端应该收到它:服务器:

public sendScreen(Socket socket) {
        this.socket = socket;
    }

    @Override
    public void run() {
        Robot robot;
        try {
            robot = new Robot();
            Dimension screenSize  = Toolkit.getDefaultToolkit().getScreenSize();
            Rectangle screen = new Rectangle( screenSize );
            BufferedImage image = robot.createScreenCapture( screen );

            BufferedImage scaledImage = Scalr.resize(image, 300);

            ByteArrayOutputStream baos = new ByteArrayOutputStream();
            ImageIO.write(image, "png", baos);
            byte[] screenBytes = baos.toByteArray();


            daos = new DataOutputStream(socket.getOutputStream());
            daos.writeInt(screenBytes.length);
            daos.write(screenBytes);
            System.out.println("Screen sent");
        } catch (AWTException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

}

客户:

public static class GetScreenshot implements Runnable{

    Socket socket;
    private static DataInputStream din;
    private static BufferedImage screenshot;

    public GetScreenshot(Socket socket) {
        this.socket = socket;
    }

    @Override
    public void run() {
        System.out.println("start method getScreenshot");
        int length;
        byte[] buffer;
        PrintWriter out;

        try {
            //sending command to send screenshot
            out = new PrintWriter(socket.getOutputStream(), true);
            out.println("GETSCREENSHOT");

            din = new DataInputStream(socket.getInputStream());
            System.out.println("DIS created");
            length = din.readInt();
            System.out.println("Got data from DIS");
            buffer = new byte[length];
            System.out.println("Filled buffer");
            for(int i = 0; i < length; i++){
                buffer[i] = (byte) din.read();
                System.out.println("read" + i+ "while length is " + length + " read data " + buffer);
            }
            System.out.println("got buffer");
            ByteArrayInputStream bais = new ByteArrayInputStream(buffer);

            screenshot = ImageIO.read(bais);
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        //writing screenshot to local disk
        File outputfile = new File("C:\\users\\XXXX\\documents\\image2.png");
        try {
            ImageIO.write(screenshot, "png", outputfile);
            System.out.println("image written to local disk");
        } catch (IOException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

        //set screenshot in the tool
        Main.labelScreenshot.setIcon(new ImageIcon(screenshot));
    }

}

有人知道如何传输屏幕截图的所有数据吗？

问候最大

Answer 1

我认为你的问题是因为你的 View ( Canvas /标签/等)宽度和高度小于你的图像。尝试调整屏幕截图的大小，使宽度和高度与您的 View ( Canvas /标签/等)相同。