编码转换工具类

public class AAA {
    public static void main(String[] args) throws Exception {
        convert("C:\\Users\\user\\hello\\dist\\static\\js\\",
                "UTF-8", "GBK", new FilenameFilter() {
                    @Override
                    public boolean accept(File dir, String name) {
                        return name.endsWith(".js");
                    }
                });

        String str="abc.rr.ee";
        System.out.println(str.endsWith("rr"));
    }


    public static void convert(String fileName, String fromCharsetName, String toCharsetName, FilenameFilter filter) throws Exception {
        convert(new File(fileName), fromCharsetName, toCharsetName, filter);
    }

    public static void convert(File file, String fromCharsetName, String toCharsetName, FilenameFilter filter) throws Exception {
        if (file.isDirectory()) {
            File[] fileList = null;
            if (filter == null) {
                fileList = file.listFiles();
            } else {
                fileList = file.listFiles(filter);
            }
            for (File f : fileList) {
                convert(f, fromCharsetName, toCharsetName, filter);
            }
        } else {
            if (filter == null || filter.accept(file.getParentFile(), file.getName())) { String fileContent = getFileContentFromCharset(file, fromCharsetName);
                saveFile2Charset(file, toCharsetName, fileContent);
            }
        }
    }
    public static String getFileContentFromCharset(File file, String fromCharsetName) throws Exception {
        if (!Charset.isSupported(fromCharsetName)) {
            throw new UnsupportedCharsetException(fromCharsetName);
        }
        InputStream inputStream = new FileInputStream(file);
        InputStreamReader reader = new InputStreamReader(inputStream,
                fromCharsetName);
        char[] chs = new char[(int) file.length()];
        reader.read(chs);
        String str = new String(chs).trim();
        reader.close();
        return str;
    }
    public static void saveFile2Charset(File file, String toCharsetName, String content) throws Exception {
        if (!Charset.isSupported(toCharsetName)) {
            throw new UnsupportedCharsetException(toCharsetName);
        }
        OutputStream outputStream = new FileOutputStream(file);
        OutputStreamWriter outWrite = new OutputStreamWriter(outputStream,
                toCharsetName);
        outWrite.write(content);
        outWrite.close();
    }
}