Java 序列化反序列化对象EOFEException

我在反序列化对象时遇到此异常：

控制台上的输出

sending request: GET_OBJS
java.io.EOFException
receiving response
at java.io.ObjectInputStream$PeekInputStream.readFully(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.readUTFBody(Unknown Source)
at java.io.ObjectInputStream$BlockDataInputStream.readUTF(Unknown Source)
at java.io.ObjectInputStream.readUTF(Unknown Source)
at java.io.ObjectStreamClass.readNonProxy(Unknown Source)
at java.io.ObjectInputStream.readClassDescriptor(Unknown Source)
at java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
at java.io.ObjectInputStream.readClassDesc(Unknown Source)
at java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
at java.io.ObjectInputStream.readObject0(Unknown Source)
at java.io.ObjectInputStream.readObject(Unknown Source)
at thesis.bot.wab.applet.DApplet.extracted(DApplet.java:218)

我正在尝试在不使用文件的情况下反序列化对象。该对象使用DatagramSocket发送

我从java小程序调用：

sendPacket("GET_OBJS");                 
[...]
input=new ObjectInputStream(new ByteArrayInputStream(receivedPacket.getData()));
objs=extracted(input);
toWrite=Integer.toString(objs.size());
input.close();
sendPacket("PRINT_"+toWrite);
[...]

private LinkedList<Objects> extracted(ObjectInputStream obj)
        throws IOException, ClassNotFoundException {
    return (LinkedList<Objects>) obj.readObject();
}

private void sendPacket(String msg) throws IOException{
        System.out.println("sending request: "+msg);
        buf=msg.getBytes();
        DatagramPacket tosend=new DatagramPacket(buf,buf.length,addr,9999);
        socket.send(tosend);
}

sendPacket("GET_OBJS");                 
[...]
    ObjectInputStream ois=new ObjectInputStream(socket.getInputStream());
    objs=extracted(ois);
    System.out.println(objs.size());
[...]

private LinkedList<Objects> extracted(ObjectInputStream ois)
        throws IOException, ClassNotFoundException {
    return (LinkedList<Objects>) ois.readObject();
}

private void sendPacket(String msg) throws IOException{
    bw.write(msg);
    bw.newLine();
    bw.flush();
    System.out.println("Message sent");
}

其中env.getObjects（）返回“对象”的LinkedList，并且对象是可序列化的类

---

有什么问题吗？

我已经修改了使用tcp套接字的代码，现在我没有收到异常

修改代码：

我从java小程序调用：

sendPacket("GET_OBJS");                 
[...]
input=new ObjectInputStream(new ByteArrayInputStream(receivedPacket.getData()));
objs=extracted(input);
toWrite=Integer.toString(objs.size());
input.close();
sendPacket("PRINT_"+toWrite);
[...]

private LinkedList<Objects> extracted(ObjectInputStream obj)
        throws IOException, ClassNotFoundException {
    return (LinkedList<Objects>) obj.readObject();
}

private void sendPacket(String msg) throws IOException{
        System.out.println("sending request: "+msg);
        buf=msg.getBytes();
        DatagramPacket tosend=new DatagramPacket(buf,buf.length,addr,9999);
        socket.send(tosend);
}

sendPacket("GET_OBJS");                 
[...]
    ObjectInputStream ois=new ObjectInputStream(socket.getInputStream());
    objs=extracted(ois);
    System.out.println(objs.size());
[...]

private LinkedList<Objects> extracted(ObjectInputStream ois)
        throws IOException, ClassNotFoundException {
    return (LinkedList<Objects>) ois.readObject();
}

private void sendPacket(String msg) throws IOException{
    bw.write(msg);
    bw.newLine();
    bw.flush();
    System.out.println("Message sent");
}

现在它工作了！ 谢谢你的帮助

---

PS:ObjectOutputStream调用flush（）是必需的开始写入之前。

数据报不能保证到达其目的地，只能尝试。为什么不使用TCP？您可以看到此相关帖子。最可能的原因是数据流已被截断。@SJuan76 u是正确的：）我正在更改代码以使用TCP套接字。稍后我将更新帖子