将图像从服务器发送到客户端以及从客户端发送到服务器

Question

客户端将文件发送到服务器，服务器接收并保存它。但是当在客户端那条 Line(while ((len = outputFromServer.read(buf)) != -1)) 来客户端时，我不知道为什么？ 试试 {

            Log.d(WiFiDirectActivity.TAG, "Opening client socket - ");

            socket.connect((new InetSocketAddress(host, port)),
                    SOCKET_TIMEOUT);

            final File f = new File(
                    Environment.getExternalStorageDirectory()
                            + "/wifip2pshared-"
                            + System.currentTimeMillis() + ".jpg");

            File dirs = new File(f.getParent());
            if (!dirs.exists())
                dirs.mkdirs();
            f.createNewFile();

            // send Data To Server
            OutputStream stream = socket.getOutputStream();
            FileInputStream file = new FileInputStream(
                    "/sdcard/samsung/Image/001" + ".jpg");
            while ((len1 = file.read(buf1)) != -1) {
                stream.write(buf1, 0, len1);
            }
            file.close();
            // ////////////////////////////////
            // ///////////////////////
            // read Data from server
            InputStream outputFromServer = socket.getInputStream();
            FileOutputStream saveData = new FileOutputStream(
                    f);
            while ((len = outputFromServer.read(buf)) != -1) {
                saveData.write(buf, 0, len);
            }
            saveData.close();

            Log.d(WiFiDirectActivity.TAG, "Client: Data written");
        } catch (IOException e) {
            Log.e("exception at client", e.getMessage());
        } finally {
            if (socket != null) {

                if (socket.isConnected()) {
                    try {
                        socket.close();
                    } catch (Exception e) {
                        // Give up
                        Log.e("exception at clientin socket close",
                                e.toString());
                    }
                }
            }
        }

服务器端

try {
            server = new ServerSocket(8988);
            Socket client = server.accept();
            final File f = new File(
                    Environment.getExternalStorageDirectory()
                            + "/wifip2pshared-"
                            + System.currentTimeMillis() + ".jpg");

            File dirs = new File(f.getParent());
            if (!dirs.exists())
                dirs.mkdirs();
            f.createNewFile();

            // receive Data From Client
            InputStream is = client.getInputStream();
            FileOutputStream fos = new FileOutputStream(f);
            String a = "acb";
            while ((len = is.read(buf)) != -1) {
                fos.write(buf, 0, len);
                Log.e("In server reviving data", a);
            }
            fos.close();
            // Send Data To Client
            OutputStream stream = client.getOutputStream();

            FileInputStream file = new FileInputStream(
                    "/sdcard/samsung/Image/001" + ".jpg");
            while ((len1 = file.read(buf1)) != -1) {
                stream.write(buf1, 0, len1);
            }
            file.close();

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

客户端将文件发送到服务器，服务器接收并保存它。但是当在客户端那条 Line(while ((len = outputFromServer.read(buf)) != -1)) 出现时，客户端卡住了，我不知道为什么？

Answer 1

仅当连接关闭或发生错误时，套接字流上的read() 才会返回 -1。服务器接收数据并保存它，但永远不会离开接收器循环来发送数据。即使它会这样做，客户端也不会离开它的接收器循环。

您必须在实际文件和接收停止之前关闭连接或发送文件大小在读取给定大小时。