ReadObject返回OptionalDataException

Question

我们正在尝试将对象从Android蓝牙客户端发送到桌面蓝牙服务器。我们试图通过ObjectInputStream和ObjectOutput Stream来做到这一点。我们对蓝牙开发也很陌生，并尝试在线查找不同的示例和解决方案。

这是我们的代码，

Android代码：

    private static 1.5.0/docs/api/java/util/UUID.html">UUID generalUuid = 1.5.0/docs/api/java/util/UUID.html">UUID.fromString("00001101-0000-1000-8000-00805F9B34FB");

    private static BluetoothSocket socket;


    private static BluetoothSocket getBluetoothSocket(){

        BluetoothAdapter mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();
        mBluetoothAdapter.cancelDiscovery();
        Set<BluetoothDevice> pairedDevices = mBluetoothAdapter.getBondedDevices();
        // If there are paired devices
        if (pairedDevices.size() > 0) {
            // Loop through paired devices
            for (BluetoothDevice device : pairedDevices) {
                // Add the name and address to an array adapter to show in a ListView
                if(device.getName().equalsIgnoreCase(("mint-0"))){
                    try {
                        return device.createRfcommSocketToServiceRecord(generalUuid);
                    } catch (1.5.0/docs/api/java/io/IOException.html">IOException e) {
                        return null;
                    }
                }
            }
        }
        return null;
    }

    public static boolean sendData(1.5.0/docs/api/java/lang/String.html">String first, 1.5.0/docs/api/java/lang/String.html">String last, int age){

            socket = getBluetoothSocket();
            try {
                socket.connect();
            } catch (1.5.0/docs/api/java/io/IOException.html">IOException e) {
                // TODO Auto-generated catch block
                socket = null;
            }

        if(socket != null){
            try {       
                    1.5.0/docs/api/java/io/ObjectOutputStream.html">ObjectOutputStream oos = new 1.5.0/docs/api/java/io/ObjectOutputStream.html">ObjectOutputStream(socket.getOutputStream());
                    oos.writeChars("X");
                    //send serializable object
                    personTest person = new personTest(first, last, age);
                    oos.writeObject(person);
                    oos.flush();
                    oos.close();
                socket.close();
                return true;
            } catch (1.5.0/docs/api/java/io/IOException.html">IOException e) {
                socket = null;
                return false;
            }
        }else{
            return false;
        }
    }

PC代码：

public class DataServer {

static final String serverUUID = "11111111111111111111111111111123";

public static void main(String[] args) throws IOException {

    LocalDevice localDevice = LocalDevice.getLocalDevice();

    localDevice.setDiscoverable(DiscoveryAgent.GIAC); // Advertising the service
    System.out.println("Setting Discoverable");

    String url = "btspp://localhost:" + serverUUID + ";name=BlueToothServer";
    StreamConnectionNotifier server = (StreamConnectionNotifier) Connector.open(url);
    System.out.println("Server: " + url);

    StreamConnection connection = server.acceptAndOpen(); // Wait until client connects
    System.out.println("Client Connected");

    //=== At this point, two devices should be connected ===//
    ObjectInputStream ois = new ObjectInputStream(connection.openInputStream());

    personTest obj = null; 

    System.out.println("Waiting for Object");
    //while(true){
        try{
            obj = (personTest) ois.readObject();

            if(obj.getName() != "Gregg Miller"){
                System.err.println("Name " + obj.getName() + " incorrect");
            }
        } catch(ClassNotFoundException cnfe){
            System.err.println("cnfe "+cnfe.getMessage());
        }
        catch(InvalidClassException ice){
            System.err.println("ice "+ice.getMessage());
        }
        catch(StreamCorruptedException sce){
            System.err.println("sce "+sce.getMessage());
        }
        catch(IOException ioe){
            System.err.println("ioe "+ioe.getMessage());
            System.err.println(ioe.toString());
            System.err.println("ODE Length: " +((OptionalDataException)ioe).length);
            System.err.println("ODE EOF: " +((OptionalDataException)ioe).eof);
        }

    //}

    System.out.println("Recieved, closing connection");

    connection.close();
}

}

运行Android应用程序和桌面程序后程序的输出如下：

ioe null java.io.OptionalDataException ODE长度：2 ODE EOF：false

根据要求，这是PersonTest代码：

package edit.rit.ce.whud;

import java.io.Serializable;

public class personTest extends Object implements Serializable {


private String firstName;
private String lastName;
private int age;

public personTest(String first, String last, int age){
    this.firstName = first;
    this.lastName = last;
    this.age = age;

}

public String getName(){
    return firstName +" "+ lastName;
}

public int getAge(){
    return age;
}

}

Answer 1

删除它：

oos.writeChars("X");

你在另一端混淆了readObject()方法。或者在另一端读取那些字符。