InputStreamReader与OutputStreamWriter 也是处理流 

package TransformStream;import org.junit.Test;import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;public class InputStreamReaderTest {@Testpublic void test1() throws IOException {FileInputStream fis = new FileInputStream("hello2.txt");
//        使用默认的字符集 将 字节流的数据转换(在IDEA中为默认UTF-8)InputStreamReader isr = new InputStreamReader(fis);//        指定字符集 将 字节流的数据转换
//        InputStreamReader isr = new InputStreamReader(fis,"gbk");char[] buffer = new char[5];int len ;while((len = isr.read(buffer))!=-1){String str= new String(buffer);System.out.print(buffer);}
//      转换流也是处理流，所以只需要关闭外层isr.close();}
}

OutputStreamWriter

//    OutputStreamWriter@Testpublic void test2() throws IOException {FileReader fr = new FileReader("hello2.txt");FileOutputStream fos = new FileOutputStream("hello3.txt");OutputStreamWriter osw = new OutputStreamWriter(fos,"gbk");char[] buffer = new char[5];int len;while((len = fr.read(buffer))!=-1){osw.write(buffer,0,len);}fr.close();osw.close();}