html一括変換UTF-8

import java.io.*;
//---------------------------------
//  
class HTMLFilter implements FilenameFilter {
	 public boolean accept(File directory, String name) {
	   if (name.endsWith(".html")) return true;
	   if (name.endsWith(".htm")) return true;
	   if (name.endsWith(".HTML")) return true;
	   if (name.endsWith(".HTM")) return true;
	   return false;
	 }
}

class BatchEncoder {
	String oldFile = null;
	public BatchEncoder(String oldFile) {
		this.oldFile = oldFile;
		File f = new File(oldFile);
		tree(f);
	}

	public void tree(File f) {
		File[] childs = f.listFiles(new HTMLFilter());
		if (childs == null) {
			return;
		}
		for (int i = 0; i < childs.length; i++) {
			if (childs[i].isDirectory()) {
				tree(childs[i]);
			} else if (childs[i].isFile()) {
				parse(childs[i]);
			}
		}

	}

	public void parse(File f) {
		BufferedReader br = null;
		BufferedWriter bw = null;
		String UTF = "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=UTF-8\" />";
		String s = "";
		try {
			InputStreamReader isr = new InputStreamReader(
					new FileInputStream(f));
			OutputStreamWriter osw = new OutputStreamWriter(
					new FileOutputStream("D:\\BatchEncoder_bak\\" + f.getName()),
					"UTF-8");
			br = new BufferedReader(isr);
			bw = new BufferedWriter(osw);
			if (!(isr.getEncoding().equals("UTF8"))) {
				while ((s = br.readLine()) != null) {
					if (!(s.matches("<meta.*charset=UTF-8.*>$"))) {
						s = s.replaceAll("<meta.*>$", UTF);
					}
					bw.write(s);
					bw.newLine();

				}
				bw.flush();
				testEncoding(f, osw);

			}
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		} finally {
			try {
				br.close();
				bw.close();
			} catch (IOException e) {
				e.printStackTrace();
			}
		}

	}

	public void testEncoding(File f, OutputStreamWriter osw) {
		if(f.isFile()) {
			if (osw.getEncoding().equals("UTF8")) {
				System.out.println(f.getName()
				+ " --> Encoding resounding success! current Encoding is: " 
				+ osw.getEncoding());
			} else {
				System.out.println(f.getName() 
				+ " --> Encoding failure! current Encoding is:" 
				+ osw.getEncoding());
			}
		}

	}
}

// ------------------------------------------------------------
// Main Method
public class TestBatchEncoder {
	public static void main(String[] args) {
		BatchEncoder be = new BatchEncoder("D:\\BatchEncoder");
	}

}