Question

我正在尝试使用套接字创建文件传输系统。在我开始从服务器向客户端发送String fileName以使文件具有相同名称之前，我的代码曾经正常工作。现在，每当我尝试发送文件时，它都会在客户端和服务器中不断给出错误。

服务器端代码：

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");

    }

}

客户端代码：

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：

客户端：

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)

服务器端：

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)

我尝试发送的文件与编译该类的目录（桌面）相同。谢谢。

Answer 1

尝试直接在客户端的路径中提供文件名。

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

然后将其发送到服务器。

由于客户端的异常FileNotFound，您正在关闭finaly块的流。

在关闭客户端流时，服务器端无法识别正在读取的流，因此会出现Connection reset异常。

由于没有用于在服务器端读取数据的流，因此您将获得NoSuchElement例外

修改

另一件事是，在写入客户端后，您没有刷新流，

pw.flush();和pw.print(s)
之后out.write()也是如此

在套接字Java上接收多个错误

1 个答案: