Read from and write to a file in Java (2): other commonly used methods

The most commonly handy methods for reading from and writing to a file are in the java.nio.file.Files class, which was introduced in Java 7. The following methods had been mostly used before the Files class was introduced.

A. Read from a file

          File theFile = new File("<directory>/<file name>");

1. The Scanner        
           Scanner scanner = new Scanner(theFile);
           while (scanner.hasNextLine()) {
                     System.out.println(scanner.nextLine());
           }

2. The BufferedReader and FileReader
          BufferedReader theReader = new BufferedReader(
                               new FileReader(theFile));
          String line = "";
          while ((line = theReader.readLine()) != null) {
                   System.out.println(line);
          }

3. The InputStreamReader and FileInputStream
          CharSet cs = CharSet.forName(System.getProperty("file.encoding"));
          InputStreamReader theReaer = new InputStreamReader(
                            new FileInputStream(theFile), cs);
          int char = -1;
          while ((char = theReader.read()) != -1) {
                     System.out.println(char);
          }

4. The BufferedInputStream and FileInputStream
          BufferedInputStream bis = new BufferedInputStream(
                             new FileInputStream(theFile));
           byte[] theBytes = new byte[theFile.length()];
           bis.read(theBytes, 0, theBytes.length);

B. Write to a file

          File theFile = new File("<directory>/<file name>");

1. The PrintWriter, BufferedWriter, and FileWriter
          PrintWriter pw = new PrintWriter(
                              new BufferedReader(
                              new FileWriter(theFiel, true)));
          pw.println("The word to write");

2. The OutputStreamWriter and the FileOutputStream
          OutputStreamWriter osw = new OutputStreamWriter(
                               new FileOutputStream(theFile, true));
           String theString = "The word to write";
           osw.write(theString, 0, theString.length());

3. The BufferedOutputStream and the FileOutputStream
           BufferedOutputStream bos = new BufferedOutputStream(
                                 new FileOutputStream(theFile, true));
           byte[] theBytes = (new String("The word to write")).getBytes();
           bos.write(theBytes, 0, theBytes.length);

           Previous <

References:

1. Read from and write to a file in Java (1): java.nio.file.Files
2. Read from and write to the command line in Java
3. Java communications over network
4. Reading, Writing, and Creating Files
5. Java IO Tutorial

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