objectoutputstream

问题 I am confused about this. Since when doing implementation of Serializable class, we need to use classes like FileOutputStream , ObjectOutputStream or something like that. Then why not we just use those classes to do things like output a object to a file and input a object from a file to maintain the status of a object directly? Why should we first implement Serializable and then do the same thing? 回答1: Understand it like this... Serializable is marker interface which denotes that the object

问题 I am writing a multiplayer game for Android phones. Communication is via Bluetooth. I have managed to send bytes from one phone to the other using the input / output stream. Since I need to be able to transfer objects I want objectstreams. However, when I try to create an Objectstream with my streams, my program hangs on the instruction. public class ConnectedThread extends Thread { private static final String TAG = "Connected Thread"; private final BluetoothSocket mmSocket; private final

问题 I recently figured out how to use ObjectOutputStream and ObjectInputStream to send objects over a simple Java socket connection between a server and a client. I was wondering if I wanted to transfer an object that might be large in size, for example an image, is it possible to put a thread that keeps track of the progress of how much data has been sent/received? If the answer to this question isn't very direct, could someone explain how I might go about doing something similar? Thanks in

问题 I recently figured out how to use ObjectOutputStream and ObjectInputStream to send objects over a simple Java socket connection between a server and a client. I was wondering if I wanted to transfer an object that might be large in size, for example an image, is it possible to put a thread that keeps track of the progress of how much data has been sent/received? If the answer to this question isn't very direct, could someone explain how I might go about doing something similar? Thanks in

问题 This question already has an answer here : StreamCorruptedException: invalid type code: AC (1 answer) Closed 2 years ago . I am using ObjectOutputStream to create a file of serialized objects. I then use an ObjectInputStream to with the readObject() method to get the objects back out of the file. It works great the first time. Meaning that if the file does not exist and I open it then append any number of objects, I can open the ObjectInputStream object and access all the objects. However, if

问题 Hey guys. I am developing a client/server program where the client is an android device. The server has a listener class that reads an object from the input stream. I created a client software for another COMPUTER that sends a small object over a local network. Computer to Computer works perfectly fine , i read the object and printed the contents. However, the SAME code ported over to android (I rewrote it just in case) does not work. I construct an object (ANY object), which is serializable,

问题 What's the difference between writeUTF and writeChars? (methods of ObjectOutputStream) Further I have not found the corresponding readChars in ObjectInputStream. 回答1: writeUTF writes text in UTF-8 format encoding preceeded with text length, so readUTF knows how many characters to read from stream. writeChars writes text as a sequence of 2-bytes chars with no length. To read it, we should use readChar method and we need to know how many chars were written. 回答2: writeChars() uses Unicode values

问题 I wrote following simple code public static void main(String args[]) throws FileNotFoundException, IOException, ClassNotFoundException { ObjectOutputStream oos = new ObjectOutputStream(new FileOutputStream(new File("data.txt"))); Human human = new Human(); human.setAge(21); human.setName("Test"); System.out.println("Human : " + human); oos.writeObject(human); human.setName("Test123"); oos.writeObject(human); ObjectInputStream ois = new ObjectInputStream(new FileInputStream(new File("data.txt"

问题 In my experiment, if Server has this: ObjectInputStream objectInputStream = new ObjectInputStream(socket.getInputStream()); ObjectOutputStream objectOutputStream = new ObjectOutputStream(socket.getOutputStream()); then client side has to do this, in the opposite order: ObjectOutputStream objectOutputStream = new ObjectOutputStream(socket.getOutputStream()); ObjectInputStream objectInputStream = new ObjectInputStream(socket.getInputStream()); Otherwise server and client will deadlock. What's

问题 Update: OK so I've grayed out parts of code and found what was causing the problem. I've added here 3 lines of code with the comment "this is the added code that causes the problem". But I still don't understand why it affects the result. I am working on a client-server application that sends data objects via ObjectOutputStream and ObjectInputStream. I noticed something strange that made me think I might not fully understand object referencing. On the client side I have a method that creates