• View
• Edit
• History
• Print

Read and write text files

#############################

Write text files

import java.io.*;

public class WriteText
{
    public static void main(String[] args)
    {
        try
        {
            FileWriter outFile = new FileWriter(args[0]);
            PrintWriter out = new PrintWriter(outFile);

            // Also could be written as follows on one line
            // Printwriter out = new PrintWriter(new FileWriter(args[0]));

            // Write text to file
            out.println("This is line 1");
            out.println("This is line 2");
            out.print("This is line3 part 1, ");
            out.println("this is line 3 part 2");
            out.close();
        } catch (IOException e){
            e.printStackTrace();
        }
    }
}

From http://www.abbeyworkshop.com/howto/java/writeText/index.html .

Read text files

StringBuilder contents = new StringBuilder();

    try {
      //use buffering, reading one line at a time
      //FileReader always assumes default encoding is OK!
      BufferedReader input =  new BufferedReader(new FileReader(aFile));
      try {
        String line = null; //not declared within while loop
        /*
        * readLine is a bit quirky :
        * it returns the content of a line MINUS the newline.
        * it returns null only for the END of the stream.
        * it returns an empty String if two newlines appear in a row.
        */
        while (( line = input.readLine()) != null){
          contents.append(line);
          contents.append(System.getProperty("line.separator"));
        }
      }
      finally {
        input.close();
      }
    }
    catch (IOException ex){
      ex.printStackTrace();
    }
// ...

From http://www.javapractices.com/topic/TopicAction.do?Id=42 .