Java Android Socket+；ObjectOutputStream工作不正常

我正在开发一个客户端/服务器程序，其中客户端是安卓设备

服务器有一个从输入流读取对象的侦听器类。我为另一台计算机创建了一个客户端软件，它通过本地网络发送一个小对象计算机对计算机工作得非常好，我阅读了对象并打印了内容。然而，移植到android上的相同代码（我只是为了以防万一重写了它）不起作用。我构造了一个可序列化的对象（任意对象），并通过ObjectOutputStream发送它。我在计算机上运行的服务器确实连接到设备，但它给我一个ClassNotFound异常，即使我正在打印对象（它有一个toString）。正如我所说，在另一台计算机上运行的相同代码（作为.jar文件）工作得非常好

这里是一个非常奇怪的部分，如果我发送一个布尔值或字符串（从设备发送），它会工作……这只是我的“自定义”对象不工作。我认为这适用于任何“标准”java对象。

如果你发现了错误，请记住代码确实有效，但只能从另一台计算机到我的计算机…而不能从Android设备到计算机。如果你还发现了另一个明显的错误，那就太棒了：）

ANDROID程序：

package WaitDroid.Main;

import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.Socket;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class main extends Activity {
/** Called when the activity is first created. */
private Button a;
private TextView x;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    this.a = (Button) this.findViewById(R.id.Send_Order);
    this.x = (TextView) this.findViewById(R.id.TextView1);
    this.a.setOnClickListener(new OnClickListener()
    {
        
        @Override
        public void onClick(View arg0)
        {
            sendMenu();
        }
    });
}

private void sendMenu()
{
     try
     {
         InetAddress serverAddress = InetAddress.getByName("128.153.180.109");
         Socket socket = new Socket(serverAddress, 4322);
         ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
         TestObject send = new TestObject("Hi", 32);
         out.writeObject(send);
         out.close();
         socket.close();
         }
         catch(Exception e)
         {
         x.setText(e.getMessage());
         }
    }
}

package WaitDroid.Main;

import java.io.Serializable;

public class TestObject implements Serializable
{
    private String name;
    private int number;

    public TestObject(String a, int b)
    {
        name = a;
        number = b;
    }

    public String toString()
    {
        return name +" - "+ number;
    }
}

package Main;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectInputStream.GetField;
import java.net.ServerSocket;
import java.net.Socket;

import Order.Order;

public class ServerListener extends Thread 
{

    public void run() {
        try {
            ServerSocket listen = new ServerSocket(4322);

            while (true) {
                Socket socket = listen.accept();
                String clientInetAddr = socket.getInetAddress().toString();
                ObjectInputStream in = new ObjectInputStream(socket.getInputStream());

                System.out.println("Connected to: " + clientInetAddr);
                
                try
                {
                    Object a = in.readObject();
                    System.out.println(a);
                    //RestaurantServerRun.n.server.addOrder(a);
                }
                
                catch(IOException e)
                {
                    System.err.println(e.getMessage());
                }

                in.close();
                socket.close();
            }
        }
        catch (Exception e) {
            System.err.println("Error in run()");
            e.printStackTrace();
        }
        
    }
}

测试对象：

package WaitDroid.Main;

import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.Socket;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class main extends Activity {
/** Called when the activity is first created. */
private Button a;
private TextView x;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    this.a = (Button) this.findViewById(R.id.Send_Order);
    this.x = (TextView) this.findViewById(R.id.TextView1);
    this.a.setOnClickListener(new OnClickListener()
    {
        
        @Override
        public void onClick(View arg0)
        {
            sendMenu();
        }
    });
}

private void sendMenu()
{
     try
     {
         InetAddress serverAddress = InetAddress.getByName("128.153.180.109");
         Socket socket = new Socket(serverAddress, 4322);
         ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
         TestObject send = new TestObject("Hi", 32);
         out.writeObject(send);
         out.close();
         socket.close();
         }
         catch(Exception e)
         {
         x.setText(e.getMessage());
         }
    }
}

package WaitDroid.Main;

import java.io.Serializable;

public class TestObject implements Serializable
{
    private String name;
    private int number;

    public TestObject(String a, int b)
    {
        name = a;
        number = b;
    }

    public String toString()
    {
        return name +" - "+ number;
    }
}

package Main;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectInputStream.GetField;
import java.net.ServerSocket;
import java.net.Socket;

import Order.Order;

public class ServerListener extends Thread 
{

    public void run() {
        try {
            ServerSocket listen = new ServerSocket(4322);

            while (true) {
                Socket socket = listen.accept();
                String clientInetAddr = socket.getInetAddress().toString();
                ObjectInputStream in = new ObjectInputStream(socket.getInputStream());

                System.out.println("Connected to: " + clientInetAddr);
                
                try
                {
                    Object a = in.readObject();
                    System.out.println(a);
                    //RestaurantServerRun.n.server.addOrder(a);
                }
                
                catch(IOException e)
                {
                    System.err.println(e.getMessage());
                }

                in.close();
                socket.close();
            }
        }
        catch (Exception e) {
            System.err.println("Error in run()");
            e.printStackTrace();
        }
        
    }
}

服务器侦听器：

package WaitDroid.Main;

import java.io.ObjectOutputStream;
import java.net.InetAddress;
import java.net.Socket;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class main extends Activity {
/** Called when the activity is first created. */
private Button a;
private TextView x;
@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    this.a = (Button) this.findViewById(R.id.Send_Order);
    this.x = (TextView) this.findViewById(R.id.TextView1);
    this.a.setOnClickListener(new OnClickListener()
    {
        
        @Override
        public void onClick(View arg0)
        {
            sendMenu();
        }
    });
}

private void sendMenu()
{
     try
     {
         InetAddress serverAddress = InetAddress.getByName("128.153.180.109");
         Socket socket = new Socket(serverAddress, 4322);
         ObjectOutputStream out = new ObjectOutputStream(socket.getOutputStream());
         TestObject send = new TestObject("Hi", 32);
         out.writeObject(send);
         out.close();
         socket.close();
         }
         catch(Exception e)
         {
         x.setText(e.getMessage());
         }
    }
}

package WaitDroid.Main;

import java.io.Serializable;

public class TestObject implements Serializable
{
    private String name;
    private int number;

    public TestObject(String a, int b)
    {
        name = a;
        number = b;
    }

    public String toString()
    {
        return name +" - "+ number;
    }
}

package Main;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectInputStream.GetField;
import java.net.ServerSocket;
import java.net.Socket;

import Order.Order;

public class ServerListener extends Thread 
{

    public void run() {
        try {
            ServerSocket listen = new ServerSocket(4322);

            while (true) {
                Socket socket = listen.accept();
                String clientInetAddr = socket.getInetAddress().toString();
                ObjectInputStream in = new ObjectInputStream(socket.getInputStream());

                System.out.println("Connected to: " + clientInetAddr);
                
                try
                {
                    Object a = in.readObject();
                    System.out.println(a);
                    //RestaurantServerRun.n.server.addOrder(a);
                }
                
                catch(IOException e)
                {
                    System.err.println(e.getMessage());
                }

                in.close();
                socket.close();
            }
        }
        catch (Exception e) {
            System.err.println("Error in run()");
            e.printStackTrace();
        }
        
    }
}

---

谢谢

我怀疑Android的序列化格式可能与Java VM的格式不兼容。您能尝试将对象转换为XML或其他文本格式吗？

是的，您是对的。它只适用于基本类型…这就解释了为什么它适用于字符串等…这真是愚蠢。有什么方法可以轻松地将对象（带有基元类型和arraylist）转换为我可以发送的格式吗？我发现问题很奇怪，但序列化过程会查看原始类所在的包。它击中了我，给了我一个ClassNotFoundException。下面是为什么，假设我的主服务器项目在包“Extra”中有clas XXXX.java。我的测试客户机将它放在一个名为“Main”的包中。它是同一个XXXX.java类，只是一个不同的包。序列化过程实际上考虑了包的位置，然后将其发送到其他服务器。我可以确认这一点，因为我使我的android应用程序在包管理方面与我的服务器完全相同，而且它工作正常！！是的，包名包含在完整类名中。相同的类名可以存在于不同的包中。不可能理解为什么您将此答案标记为正确。事实并非如此。您的实际问题是更改包名，这会让您在Java和Android中都感到痛苦。