文件编码转换（GBK转UTF-8）

public class FileReEncoding {

    String file1 = "E:\\java-fx";

    String code1 = "GBK";

    String file2 = "E:\\java-fx-2";

    String code2 = "UTF-8";

    public static void main(String[] args) throws IOException {

        FileReEncoding code = new FileReEncoding();
        code.processFile(new File(code.file1));
    }

    public void processFile(File fileIn) throws IOException {
        if (fileIn != null) {
            if (fileIn.isDirectory()) {
                String newDir = fileIn.getCanonicalPath().replace(file1, file2);
                File dir = new File(newDir);
                if (!dir.exists()) {
                    dir.mkdir();
                }
                for (File childFile : fileIn.listFiles()) {
                    processFile(childFile);
                }
            } else if (fileIn.getName().endsWith(".java")) {
                String filePath = fileIn.getCanonicalPath();
                BufferedReader br = new BufferedReader(new InputStreamReader(Files.newInputStream(fileIn.toPath()), code1));
                String newFile = filePath.replace(file1, file2);
                BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(Files.newOutputStream(Paths.get(newFile)), code2));
                String line;
                while ((line = br.readLine()) != null) {
                    bw.write(line + "\r\n");
                }
                br.close();
                bw.close();
            } else {
                FileInputStream fis = new FileInputStream(fileIn);
                FileOutputStream fos = new FileOutputStream(fileIn.getCanonicalPath().replace(file1, file2));
                byte[] buffer = new byte[1024];
                int len;
                while ((len = fis.read(buffer)) != -1) {
                    fos.write(buffer, 0, len);
                }
                fis.close();
                fos.close();
            }
        }
    }
}