InputStreamReader

In this chapter you will learn:

What is InputStreamReader and how to use InputStreamReader
Create InputStreamReader with encoding

Use InputStreamReader

An InputStreamReader is a bridge from byte streams to character streams. It has the following constructors.

InputStreamReader(InputStream in)
Creates an InputStreamReader that uses the default charset.
InputStreamReader(InputStream in, Charset cs)
Creates an InputStreamReader that uses the given charset.
InputStreamReader(InputStream in, CharsetDecoder dec)
Creates an InputStreamReader that uses the given charset decoder.
InputStreamReader(InputStream in, String charsetName)
Creates an InputStreamReader that uses the named charset.

The code below creates BufferedReader from InputStreamReader and URL.

import java.io.InputStreamReader;
import java.net.URL;
/*from ja v  a2 s.c  om*/
public class Main {
  public static void main(String[] args) throws Exception {
    URL myURL = new URL("http://www.google.com");
    InputStreamReader so = new InputStreamReader(myURL.openStream());
    while (true) {
      int output = so.read();
      if (output != -1) {
        System.out.println((char)output);
      } else {
        break;
      }
    }
    so.close();
  }
}

Create InputStreamReader with encoding

We can specify encoding when creating InputStreamReader.

import java.io.InputStreamReader;
import java.net.URL;
// j  a  v a  2s .  co  m
public class Main {
  public static void main(String[] args) throws Exception {
    URL myURL = new URL("http://www.google.com");
    InputStreamReader so = new InputStreamReader(myURL.openStream(),"8859_1");
    while (true) {
      int output = so.read();
      if (output != -1) {
        System.out.println((char)output);
      } else {
        break;
      }
    }
    so.close();
  }
}