objectoutputstream

I'm trying to get my head around the ObjectInputStream/ObjectOutputStream , so I create a very simple server-client application where the client sends a HashMap object over the created stream and the server receives that and prints it out. This my server code: import java.io.*; import java.net.*; public class Server { public static void main(String[] args) throws IOException, ClassNotFoundException { ServerSocket server = new ServerSocket(4444); while (true) { Socket socket = server.accept(); ObjectInputStream objIn = new ObjectInputStream(socket.getInputStream()); if (objIn.readObject() !=

In both client and server classes, I have an exact same inner class called Data. This Data object is being sent from the server using: ObjectOutputStream output= new ObjectOutputStream(socket.getOutputStream()); output.writeObject(d); (where d is a Data object) This object is received on the client side and cast to a Data object: ObjectInputStream input = new ObjectInputStream(socket.getInputStream()); Object receiveObject = input.readObject(); if (receiveObject instanceof Data){ Data receiveData = (Data) receiveObject; // some code here... } I'm getting a java.lang.ClassNotFoundException:

How can I convert the java Object into a InputStream? You can use ObjectOutputStream You write the object (obj in the code below) to the ObjectOutputStream , your object you want to convert to an input stream must implement Serializable . ByteArrayOutputStream baos = new ByteArrayOutputStream(); ObjectOutputStream oos = new ObjectOutputStream(baos); oos.writeObject(obj); oos.flush(); oos.close(); InputStream is = new ByteArrayInputStream(baos.toByteArray()); 来源： https://stackoverflow.com/questions/9264162/how-can-i-convert-an-object-to-inputstream

I'm trying to do local IPC using Sockets and Object streams in Java however I'm seeing poor performance. I am testing the ping time of sending an object via an ObjectOutputStream to receiving a reply via an ObjectInputStream over a Socket. Here's the Requestor: public SocketTest(){ int iterations = 100; try { Socket socket = new Socket("localhost", 1212); ObjectInputStream objectInputStream = new ObjectInputStream(socket.getInputStream()); ObjectOutputStream objectOutputStream = new ObjectOutputStream(socket.getOutputStream()); double start = System.currentTimeMillis(); for (int i = 0; i <

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 and returns a User object: private static User createNewUser() { User newUser = new User(); newUser

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 the reason for this? and is there a formal API spec for it? Yes. I see how this might happen. The

I have the following code on the applet side: URL servlet = new URL(appletCodeBase, "FormsServlet?form=requestRoom"); URLConnection con = servlet.openConnection(); con.setDoOutput(true); con.setDoInput(true); con.setUseCaches(false); con.setRequestProperty("Content-Type", "application/octet-stream"); ObjectOutputStream out = new ObjectOutputStream(con.getOutputStream()); out.writeObject(user);//user is an object of a serializable class out.flush(); out.close(); ObjectInputStream in = new ObjectInputStream(con.getInputStream()); status = (String)in.readObject(); in.close(); if("success".equals(