把乱码的GBK编码的文件放到当前data目录下，然后就。。。嘿嘿

GBK批量转UTF-8

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

public class GBK2UTF8
{
  static File	srcDir	= new File("data/");
	static File	outputDir	= new File("ok/");

	/**
	 * @param args
	 */
	public static void main(String[] args)
	{
		if (!srcDir.isDirectory())
		{
			return;
		}
		File[] fs = srcDir.listFiles();

		if (!outputDir.exists())
		{
			outputDir.mkdirs();
		}

		try
		{
			new GBK2UTF8().parse(fs);
		} catch (IOException e)
		{
			e.printStackTrace();
		}
	}

	private void parse2UTF_8(File file, File targetFile) throws IOException
	{
		StringBuffer msg = new StringBuffer();
		
		PrintWriter ps = new PrintWriter(new OutputStreamWriter(new FileOutputStream(targetFile, false), "utf8"));
		BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file), "gbk"));

		String line = br.readLine();
		while (line != null)
		{
			msg.append(line).append("\r\n");
			line = br.readLine();
		}
		ps.write(msg.toString());
		br.close();
		ps.flush();
		ps.close();
	}
	
	private void parse(File[] fs) throws IOException
	{
		for (File file : fs)
		{
			if (!file.isDirectory())
			{
				File destFile = new File(outputDir, file.getName());
				parse2UTF_8(file, destFile);
			} else
			{
				parse(file.listFiles());
			}
		}
	}
}