20. Example: Sequential input of ASCII files

• Class BufferedInputStream implements input stream of bytes

• Class InputStreamReader

  • is a bridge from byte streams to character streams

  • reads bytes and decodes them into characters using a specified character set

  • for efficiency it is wrapped within BufferedReader.

  
  // Reads employee data from ASCII text file sequentially, line by line
  import java.nio.file.*;
  import java.io.*;
  public class ReadEmployeeFile
  {
      public static void main(String[] args)
      {
          Path file =
              Paths.get("C:\\example\\Employees.txt");
          String s = "";
          try
          {
              InputStream input = new
                  BufferedInputStream(Files.newInputStream(file));
              
              // BufferedReader implements reading character files
              BufferedReader reader = new
                  BufferedReader(new InputStreamReader(input)); // uses the default charset
  
              s = reader.readLine();
              while(s != null)
              {
                  System.out.println(s);
                  s = reader.readLine();
              }
              reader.close();
          }
          catch(Exception e)
          {
              System.out.println("Message: " + e);
          }
      }
  }//class ReadEmployeeFile