在套接字Java上收到多個錯誤

Question

我正在嘗試使用套接字創建文件傳輸系統。 在我開始從服務器向客戶端發送String fileName以使文件具有相同名稱之前，我的代碼曾經能夠正常工作。 現在，每當我嘗試發送文件時，它總是在客戶端和服務器中給我不同的錯誤。

服務器端代碼：

public void soc_server() throws IOException {

   long time = System.currentTimeMillis();

    long totalSent = 0;
    ServerSocket servsock = null;
    Socket sock = null;
    PrintWriter pw = null;
    FileInputStream fileInputStream = null;

    try {

        servsock = new ServerSocket(55000);
        sock = servsock.accept();
        System.out.println("Hello Server");
        Scanner sc = new Scanner(System.in);

        System.out.println("Please enter the file name or file path");

        String s = sc.nextLine();

        sc.close();

        File file = new File(s);

        if (file.exists())

            System.out.println("File found");
        else
            System.out.println("File not found");

        OutputStream out = sock.getOutputStream();

        pw = new PrintWriter(sock.getOutputStream(), true);

        pw.print(s);

        fileInputStream = new FileInputStream(s);

        byte[] buffer = new byte[100 * 1024];

        int bytesRead = 0;

        while ((bytesRead = fileInputStream.read(buffer)) != -1) {

            if (bytesRead > 0) {

                out.write(buffer, 0, bytesRead);

                totalSent += bytesRead;

                System.out.println("sent " + (totalSent / 1024) + " KB "
                        + ((System.currentTimeMillis() - time) / 1000)
                        + " sec");
            }

        }

    } catch (Exception e) {

        System.out.println("exception " + e);

    } finally {
        sock.close();

        pw.close();

        servsock.close();

        fileInputStream.close();

        System.out.println("Sent " + (totalSent / 1024) + " kilobytes in "

        + ((System.currentTimeMillis() - time) / 1000) + " seconds");

    }

}

客戶端代碼：

public void soc_client() throws Exception {
    long time = System.currentTimeMillis();
    long totalRecieved = 0;
    Socket sock = null;
    InputStream in = null;
    BufferedReader br = null;
    FileOutputStream fileOutputStream = null;

    try {
        sock = new Socket("172.16.27.106", 55000);
        System.out.println("Hello Client");
        in = sock.getInputStream();
        br = new BufferedReader(new InputStreamReader(in));
        String fileName = br.readLine();
        File outputFile = new File(fileName + "");
        fileOutputStream = new FileOutputStream(outputFile);

        byte[] buffer = new byte[100 * 1024];
        int bytesRead = 0;

        while ((bytesRead = in.read(buffer)) != -1) {
            fileOutputStream.write(buffer, 0, bytesRead);
            totalRecieved += bytesRead;
            System.out.println("Recieved " + (totalRecieved / 1024)
                    + " kilobytes in "
                    + ((System.currentTimeMillis() - time) / 1000)
                    + " seconds");
        }

    } catch (Exception e) {
        System.out.println("Exception " + e);
    } finally {
        br.close(); // CLOSING BufferedReader
        fileOutputStream.close();
        sock.close();
        System.out.println("Recieved " + totalRecieved + " bytes in "
                + (System.currentTimeMillis() - time) + "ms.");
    }
}

例外情況：

客戶端：

Exception java.io.FileNotFoundException: Invalid file path
Exception: java.lang.NullPointerException

Exception in thread "main" java.io.FileNotFoundException: Invalid file path 
          at java.io.FileOutputStream.<init>(Unknown Source) 
          at java.io.FileOutputStream.<init>(Unknown Source) 
          at Client.soc_client(Client.java:25) 
          at Index.main(Index.java:24)

服務器端：

Exception java.net.SocketException: Connection reset
Exception: java.util.NoSuchElementException
Exception java.net.SocketException: Broken pipe

Exception in thread "main" java.net.SocketException: Connection reset 
          at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:113)
          at java.net.SocketOutputStream.write(SocketOutputStream.java:153) 
          at Server.soc_server(Server.java:59) 
          at Index.main(Index.java:21) 

我試圖發送的文件與我在其中編譯類的目錄（桌面）相同。 謝謝。

Answer 1

嘗試直接在客戶端路徑中提供文件名。

File outputFile = new File("yourfile.txt");

然后將其發送到服務器。

由於客戶端FileNotFound ，您將在finaly塊中關閉流。

當您關閉客戶端流時，服務器端無法識別正在從中讀取的流，因此Connection reset異常。

由於沒有流可以在服務器端讀取數據，因此您會收到NoSuchElement異常

編輯

另一件事是，您不會在寫入客戶端后刷新流，

pw.flush(); 在pw.print(s)和out.write()