IO流_转换流InputStreamReader的使用

package cn.itcast_02;

import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

/*
 * InputStreamReader(InputStream is):用默认编码读取数据
 * InputStreamReader(InputStream is,String charsetName):用指定编码读取数据
 */
public class InputStreamReaderDemo {
  public static void main(String[] args) throws IOException {
    // 创建对象
    // InputStreamReader isr = new InputStreamReader(new FileInputStream(
    // "osw.txt"));
    InputStreamReader isr = new InputStreamReader(new FileInputStream(
        "osw.txt"), "UTF-8");

    // 读取数据
    // 一次读取一个字符
    int ch = 0;
    while ((ch = isr.read()) != -1) {
      System.out.print((char) ch);
    }

    // 释放资源
    isr.close();
  }
}