java批量将utf-8转化为gbk

import java.io.BufferedReader;
import java.io.DataInputStream;
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.Writer;

public class UTFToGBK {

/**
* @param args
*/

private static void transferFile(String srcFileName, String destFileName)
throws IOException {

File OldFile = new File(srcFileName);
if (!OldFile.exists()) {
System.out.print("要转化的文件路径不存在！");
return;
}

File NewFile = new File(destFileName);

// NewFile.mkdir();

// 如果是文件，则转换
if (OldFile.isFile()) {
String line_separator = System.getProperty("line.separator");
FileInputStream fis = new FileInputStream(srcFileName);
StringBuffer content = new StringBuffer();
DataInputStream in = new DataInputStream(fis);
BufferedReader d = new BufferedReader(new InputStreamReader(in,
"utf-8"));
String line = null;
while ((line = d.readLine()) != null)
content.append(line + line_separator);
d.close();
in.close();
fis.close();
// 转化之后写入新文件
Writer ow = new OutputStreamWriter(new FileOutputStream(
destFileName), "GBK");
ow.write(content.toString());
ow.close();
} else {

if (!NewFile.exists()) {
NewFile.mkdir();
}

// 查找目录下面的所有文件与文件夹
File[] childFiles = OldFile.listFiles();
for (int i = 0, n = childFiles.length; i < n; i++) {
File child = childFiles[i];
String childFrom = srcFileName + "/" + child.getName();
String childTo = destFileName + "/" + child.getName();
transferFile(childFrom, childTo);
}
}

}

public static void main(String[] args) {
// TODO Auto-generated method stub
try {
transferFile("C:\\Users\\Dove\\Desktop\\java\\tpartnerregbaseinfo",
"C:\\Users\\Dove\\Desktop\\tpartnerregbaseinfo");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

}