将文件夹中GBK编码的文档转化为utf-8编码的文档

package util;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

/**
* @author luofei
*
* version 2012-11-13
*/
public class transfer {

public static void main(String[] args) {

File source = new File("C:\\txt");
File[] file = source.listFiles();
FileInputStream fileInputStream = null;
InputStreamReader inputStreamReader = null;
BufferedReader bufferedReader = null;

String[] nameString = source.list();
FileOutputStream fileOutputStream = null;
OutputStreamWriter outputStreamWriter = null;
BufferedWriter bufferedWriter = null;
for (int i = 0; i < file.length; i++) {
   try {
    // 要读的原文件。
    fileInputStream = new FileInputStream(file[i]);
    // 原来的文本的编码格式是gb2312
     inputStreamReader = new InputStreamReader(fileInputStream,"gb2312");
     bufferedReader = new BufferedReader(inputStreamReader);
    // 要写入的新文件。
     fileOutputStream = new FileOutputStream("C:\\txt3\\"+ nameString[i]);

    // 转换后的文本的编码格式是utf-8。
     outputStreamWriter = new OutputStreamWriter(fileOutputStream,"utf-8");
     bufferedWriter = new BufferedWriter(outputStreamWriter);

     String line = bufferedReader.readLine();
     bufferedWriter.write(line+" \r\n");
     line = bufferedReader.readLine();
     try {
    while (line != null) {
           bufferedWriter.write(line);
           line=bufferedReader.readLine();
    } }catch (IOException e) {
     e.printStackTrace();
    }
     bufferedWriter.close();
     outputStreamWriter.close();
     fileOutputStream.close();
     bufferedReader.close();
     inputStreamReader.close();
     fileInputStream.close();
   } catch (FileNotFoundException e) {
     e.printStackTrace();
   } catch (IOException e) {
    e.printStackTrace();
   }
}
}

}