我尝试使用 DatagramSocket 将 HashMap 从客户端进程发送到服务器进程，但收到 ObjectInputStream.readObject() EOFException。我发现了很多其他人遇到此问题的引用资料，但我很难弄清楚哪些解决方案适用于我。这是我的代码...
protected static void sendMsgMap(DatagramSocket sendSocket,
DatagramPacket sendPacket,
HashMap<Integer, Boolean> message,
InetAddress address, int port) {
clearBuffer(sendPacket.getData());
sendPacket.setAddress(address);
sendPacket.setPort(port);
ByteArrayOutputStream byteStream = new ByteArrayOutputStream();
ObjectOutput outStream = null;
try {
outStream = new ObjectOutputStream(byteStream);
outStream.writeObject(message);
outStream.flush();
outStream.close();
sendPacket.setData(byteStream.toByteArray());
sendSocket.send(sendPacket);
} catch (IOException exception) {
exception.printStackTrace();
}
}
@SuppressWarnings("unchecked")
protected static HashMap<Integer, Boolean> receiveMsgMap(DatagramSocket receiveSocket,
DatagramPacket receivePacket) throws SocketTimeoutException {
HashMap<Integer, Boolean> ret = new HashMap<Integer, Boolean>();
clearBuffer(receivePacket.getData());
try {
receiveSocket.receive(receivePacket);
ByteArrayInputStream byteStream = new ByteArrayInputStream(receivePacket.getData());
ObjectInput inStream = new ObjectInputStream(byteStream);
/* EXCEPTION OCCURS AT LINE BELOW */
ret = (HashMap<Integer, Boolean>)inStream.readObject();
} catch (SocketTimeoutException exception) {
throw exception;
} catch (IOException | ClassNotFoundException exception) {
exception.printStackTrace();
}
return ret;
}
这是堆栈跟踪...
java.io.EOFException
at java.io.ObjectInputStream$PeekInputStream.readFully(ObjectInputStream.java:2323)
at java.io.ObjectInputStream$BlockDataInputStream.readInt(ObjectInputStream.java:2816)
at java.io.ObjectInputStream.readHandle(ObjectInputStream.java:1450)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1328)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at java.util.HashMap.readObject(HashMap.java:1155)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017)
at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1891)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1796)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1348)
at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370)
at info.danforbes.cs370.UDPUtils.receiveMsgMap(UDPUtils.java:94)
at info.danforbes.cs370.ReliableUDPServer$ServerThread.listen(ReliableUDPServer.java:27)
at info.danforbes.cs370.UDPServer$ServerThread.run(UDPServer.java:191)
at info.danforbes.cs370.UDPServer.run(UDPServer.java:106)
at info.danforbes.cs370.ReliableUDPServer.main(ReliableUDPServer.java:45)
最佳答案
查看 DataPacket javadoc:http://docs.oracle.com/javase/7/docs/api/java/net/DatagramPacket.html#getData()
并注意偏移量和长度
关于java - ObjectInputStream.readObject() EOFException，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/19595041/