Re: help on converting bytearrayinputstream to objectinputstream [小糊涂的灵感]

Re: help on converting bytearrayinputstream to objectinputstream Author: lightblue_daisy In Reply To: help on converting bytearrayinputstream to objectinputstream

Jun 7, 2004 1:18 PM   Reply 5 of 5

You have to writeObject first.

A sample code as below, hope it's helpful.
----------------------------------------

                        

                        try {

                        //Using ByteArrayInputStream to simulate YOUR socket.getInputStream()
                        
                        

                        String strSocketInput = "TAIWAN";

                        ByteArrayInputStream baIn = new ByteArrayInputStream(strSocketInput.getBytes());

                        DataInputStream oInputStream = new DataInputStream(baIn);

                        

                        byte[] arr = new byte[oInputStream.available()];

                        oInputStream.read(arr);

                        baIn.close();

                        oInputStream.close();

                        

                        //A new byte array
                        
                        

                        String strIdentifier = ", a beautiful country.";

                        byte[] identifier = strIdentifier.getBytes();

                        

                        //the final one we will send
                        
                        

                        byte[] ob = new byte[arr.length + identifier.length];

                        ByteArrayInputStream baNew = new ByteArrayInputStream(arr);

                        baNew.read(ob, 0, arr.length);

                        //Append new byte array
                        
                        

                        baNew = new ByteArrayInputStream(identifier);

                        baNew.read(ob, arr.length, identifier.length);

                        

                        //== Coz we will invoke 'readObject', we have to 'writeObject'
                        first.
                        
                        

                        ByteArrayOutputStream baOut = new ByteArrayOutputStream();

                        ObjectOutputStream objOut = new ObjectOutputStream(baOut);

                        //write the object 'ob' to 'baOut'
                        
                        

                        objOut.writeObject(ob);

                        objOut.flush();

                        objOut.close();

                        

                        //get the byte array of 'baOut'
                        
                        

                        byte[] baSend = baOut.toByteArray();

                        baOut.close();

                        

                        //retrieve the object 'ob'
                        
                        

                        ByteArrayInputStream baRecIn = new ByteArrayInputStream(baSend);

                        ObjectInputStream objIn = new ObjectInputStream(baRecIn);

                        //the object type of 'ob' is byte[]
                        
                        

                        byte[] baRec = (byte[])objIn.readObject();

                        

                        //see what we receive
                        
                        

                        String strReceive = new String(baRec);

                        System.out.println("WHAT WE RECEIVED: " + strReceive);

                        } catch (Exception e) {

                        e.printStackTrace();

                        }