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标题: How to keep stream open? [打印本页]
作者: zhshqzyc    时间: 2007-04-22 09:27
标题: How to keep stream open?
We all know write a string to a file is simple. Such as:

  2. import java.io.*;
  3. class FileWrite
  4. {
  5.    public static void main(String args[])
  6.   {
  7.       try{
  8.     // Create file
  9.     FileWriter fstream = new FileWriter("out.txt");
  10.         BufferedWriter out = new BufferedWriter(fstream);
  11.     out.write("Hello Java");
  12.     //Close the output stream
  13.     out.close();
  14.     }catch (Exception e){//Catch exception if any
  15.       System.err.println("Error: " + e.getMessage());
  16.     }
  17.   }
  18. }
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I have a case which needs write strings in many methods.
How can I pass file name or stream and implement it?
(Open the stream, pass the stream into each method)

  2. public void doDiff(String oldFile, String newFile, String Directory) {
  3.       
  4.     String path = System.getProperty("user.dir");
  5.     String DiffFileName = path+'/'+Directory+'/'+ oldFile+"D.txt";
  6.    
  7.     File file = new File(Directory,DiffFileName);
  8.     try{
  9.             FileWriter outFile = new FileWriter(file);
  10.             BufferedWriter out = new BufferedWriter(outFile);
  11.             String s1 =  ">>>> Difference of file \"" + oldFile  
  12.             +  "\" and file \"" + newFile + "\".\n";
  13.             out.write(s1);
  14.             out.flush();
  15.     }
  16.     catch (Exception e){//Catch exception if any
  17.             System.err.println("Error: " + e.getMessage());
  18.     }
  19. showinsert(file)
  20. }
  21. void showinsert(File file)
  22.   {
  23.        if ( printstatus == change ) println( ">>>>     CHANGED TO" );
  24.        else if ( printstatus != insert )
  25.       String sn= ">>>> INSERT BEFORE " + printoldline ;
  26.   // how can I print sn into file
  27. // do I need to create stream again?
  28.        printstatus = insert;
  29.        newinfo.symbol[ printnewline ].showSymbol();
  30.        anyprinted = true;
  31.        printnewline++;
  32.   }
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