用java实现文本文档的ANSI编码转化为UTF-8

package cwj.bbb;

import java.io.*;


class StreamTest
{
public static void main(String[] args) throws IOException
{
/*
 * 文件由ANSI转化为UTF-8
 * 需要用到流InputStreamReader和OutputStreamWriter
 * 这两个流有charset功能
 * */
File srcFile = new File("/home/cwjy1202/hadoop/javaTest/dali09_seg_pos.txt");
File destFile = new File("/home/cwjy1202/hadoop/javaTest/dali01_000_CWJ000.txt");
InputStreamReader isr = new InputStreamReader(new FileInputStream(srcFile), "GBK"); //ANSI编码
OutputStreamWriter osw = new OutputStreamWriter(new FileOutputStream(destFile), "UTF-8"); //存为UTF-8

int len = isr.read();
while(-1 != len)
{

osw.write(len);
len = isr.read();
}
//刷新缓冲区的数据，强制写入目标文件
osw.flush();
osw.close();
isr.close();
} 
}

如有不对，请指正，自己刚刚学习java，搞了好久才搞定！