一道JAVA IO面试题

将一个GBK编码的文本文件转存为一个UTF-8编码的文本文件。由于很久没用IO流了，当时的代码写的相当混乱，现在整理如下：import java.io.*;public class ChangeEncoding {    public static void changeEncoding (String inEncoding, String outEncoding,            String inFileName, String outFileName)  throws IOException {        BufferedReader reader = new BufferedReader(            new InputStreamReader(            new FileInputStream(inFileName), inEncoding));        BufferedWriter writer = new BufferedWriter(            new OutputStreamWriter(            new FileOutputStream(outFileName), outEncoding));        String s = null;        while ((s = reader.readLine()) != null) {            writer.write(s, 0, s.length());            writer.newLine();        }        writer.flush();        writer.close();        reader.close();    }    public static void main(String[] args) {        try {            changeEncoding(“GBK”, “UTF-8″, “gbk.txt”, “utf8.txt”);        } catch (IOException e) {            System.out.println(“转换失败，原因：” + e.getMessage());        }    }}PS:BufferedWriter输出的UTF-8文件是无BOM格式编码的