Java ObjectInputStream java.io.EOFException

Question

我正在尝试使用套接字将数据从 MySQL 传递到客户端。对于 List，我更喜欢使用数组，但如果我使用此发送数组:

InputStream input = client.getInputStream();
        OutputStream output = client.getOutputStream();
        ObjectOutputStream obOutput = new ObjectOutputStream(output);
        Statement statement = dataConnection.createStatement();
        ResultSet modList = statement.executeQuery("SELECT modID, downloads FROM modRegister");
        String[][] mods = new String[3][3];
        int column = 0;
        while (modList.next()) {
            mods[column][1] = modList.getString("modID");
            mods[column][2] = modList.getString("downloads");
            ++column;
        }

        System.out.println(mods[1][1]);

        PrintWriter printClient = new PrintWriter(output);
        printClient.println(column);
        printClient.close();
        obOutput.writeObject(mods);
        obOutput.flush();

并使用以下方式从客户端接收它:

Socket server = new Socket("localhost", 25566);
    InputStream input = server.getInputStream();
    OutputStream output = server.getOutputStream();
    ObjectInputStream obInput = new ObjectInputStream(input);
    BufferedReader reader = new BufferedReader(new InputStreamReader(input));
    String s;
    int columns = 0;
    while((s = reader.readLine()) != null) {
        columns = Integer.parseInt(s);
        System.out.println(s);
    }
    String [][] mods;
    TimeUnit.SECONDS.sleep(10);
    mods = (String[][])obInput.readObject();

即使有时间延迟，我也收到 EOFException 。该数组有效。我测试了打印其中的所有数据。这是异常(exception)情况:

Caused by: java.io.EOFException
at java.io.ObjectInputStream$BlockDataInputStream.peekByte(ObjectInputStream.java:2601)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1319)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:371)
at layout.MainStoreController.initialize(MainStoreController.java:36)
... 32 more

Answer 1

我怀疑关闭 PrintWriter 会关闭它写入的 OutputStream。

PrintWriter printClient = new PrintWriter(output);
printClient.println(column);
printClient.close();

当流关闭时，套接字也关闭，另一端将在读取时观察到文件结束符。