一般的な符号化フォーマットファイルを識別し、UTF-8符号化java実装ソースコードに変換する

package com.buptsse.ate.utils;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
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;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * 
 * @author michaelw
 * @email [email protected]
 * @date 2012-09-03
 */
public class ConverEncoding {
	
	static String CODE = "UTF-8";
	static String FILE_SUFFIX = ".txt";// 
//	static String FILE_SUFFIX = ".css";
//	static String FILE_SUFFIX = ".js";
//	static String FILE_SUFFIX = ".htm";
	static String srcDir = "C:\\WorkTools\\weenCompany_ChineseEnglish_JT_V5.3.0_UTF8";// 
	/**
	 * 
	 * @param args
	 * @throws Exception
	 */
	public static void main(String[] args) throws Exception {
		List files = new ArrayList();
		fetchFileList(srcDir, files, FILE_SUFFIX);
		String filecode = "";
		for (String fileName : files) {
			filecode = codeString(fileName);
			if (!filecode.equals(CODE)) {
				convert(fileName, filecode, fileName, CODE);
			}
		}
	}

	public static void convert(String oldFile, String oldCharset,
			String newFlie, String newCharset) {
		BufferedReader bin;
		FileOutputStream fos;
		StringBuffer content = new StringBuffer();
		try {
			System.out.println("the old file is :"+oldFile);
			System.out.println("The oldCharset is : "+oldCharset);
			bin = new BufferedReader(new InputStreamReader(new FileInputStream(
					oldFile), oldCharset));
			String line = null;
			while ((line = bin.readLine()) != null) {
				// System.out.println("content:" + content);
				content.append(line);
				content.append(System.getProperty("line.separator"));
			}
			bin.close();
			File dir = new File(newFlie.substring(0, newFlie.lastIndexOf("\\")));
			if (!dir.exists()) {
				dir.mkdirs();
			}
			fos = new FileOutputStream(newFlie);
			Writer out = new OutputStreamWriter(fos, newCharset);
			out.write(content.toString());
			out.close();
			fos.close();
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static void fetchFileList(String strPath, List filelist,
			final String regex) {
		File dir = new File(strPath);
		File[] files = dir.listFiles();
		Pattern p = Pattern.compile(regex);
		if (files == null)
			return;
		for (int i = 0; i < files.length; i++) {
			if (files[i].isDirectory()) {
				fetchFileList(files[i].getAbsolutePath(), filelist, regex);
			} else {
				String strFileName = files[i].getAbsolutePath().toLowerCase();
				Matcher m = p.matcher(strFileName);
				if (m.find()) {
					filelist.add(strFileName);
				}
			}
		}
	}

	/**
	 *  
	 * 
	 * @param fileName
	 *            :file
	 * @return  
	 * @throws Exception
	 */
	public static String codeString(String fileName) throws Exception {
		BufferedInputStream bin = new BufferedInputStream(new FileInputStream(
				fileName));
		int p = (bin.read() << 8) + bin.read();
		String code = null;

		switch (p) {
		case 0xefbb:
			code = "UTF-8";
			break;
		case 0xfffe:
			code = "Unicode";
			break;
		case 0xfeff:
			code = "UTF-16BE";
			break;
		default:
			code = "GBK";
		}

		return code;
	}
}