识别常见编码格式文件并转换成UTF-8编码的java实现

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 [e-mail] * @date 2012-09-03 */public class ConverEncoding {         static String CODE = "UTF-8";    static String FILE_SUFFIX = ".txt";//文件扩展名//  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";//文件所在目录    /**     *      * @param args     * @throws Exception     */    public static void main(String[] args) throws Exception {        List<String> files = new ArrayList<String>();        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<String> 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);                }            }        }    }     /**     * 判断文件的编码格式     *      * @param fileName     *            :file     * @return 文件编码格式     * @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;    }}

转自：http://www.cnblogs.com/DiYuShe/archive/2012/09/03/2668575.html