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POA problem with java Object Streams while writing to file
 

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  1. POA problem with java Object Streams while writing to file
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    <p>I am trying to write an Object of kind "HashMap" to a file &amp; recover it when my program run again. But I faced with an EOFException when I try to read that object and the Object is not read from the file. I use the flush() &amp; close() methods when I wrote the object for the FileOutputStream &amp; ObjectOutputStream. Also I create OutputStream &amp; InputStream together for my file. here is my code:</p> <pre><code>DataOutputStream outToFile; DataInputStream inFromFile; ObjectOutputStream writeTableToFile; ObjectInputStream readTableFromFile; File tableFile; public DNS(){ try { tableFile = new File("table.txt"); outToFile = new DataOutputStream(new FileOutputStream(tableFile) ); writeTableToFile = new ObjectOutputStream(outToFile); inFromFile = new DataInputStream(new FileInputStream(tableFile)); readTableFromFile = new ObjectInputStream(inFromFile); HashMap table2 = (HashMap) readTableFromFile.readObject(); if (table2 == null) table=new HashMap(100); else table = table2; } catch (FileNotFoundException e) { e.printStackTrace(); }catch(EOFException e){ table=new HashMap(100); } catch (IOException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } </code></pre> <p>}</p> <p>and here is code for writing object:</p> <pre><code> table.put(NameField.getText(), IPField.getText()); try { //writeTableToFile.reset(); writeTableToFile.writeObject(table); writeTableToFile.flush(); } catch (IOException e1) { e1.printStackTrace(); } </code></pre> <p>Regards, sajad</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USsajad
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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      1. PTAnswer
    2. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. COAre both an output stream and an input stream to the same file open at the same time? Is this a good idea? Create an open the input stream when you try to read, then close it. Create and open the output stream when you want to write, then close it.
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      1. POA problem with java Object Streams while writing to file
      1. USJava Drinker
 

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