File Encoding Converter

在Java应用开发中，经常会遇到不同的开发人员的IDE设置的文件编码格式不一样，在后续集成环境中往往会因为file encoding不同引发一些小问题，故编写了一个小程序做文件转换动作。

 

import java.io.*;

public class FileEncodingConverter {
    //Java file extention
    public static final String FILE_EXTENTION_JAVA = ".java";

    public static final int BUFFER_SIZE = 1024 * 4;

    //File encoding
    public static final String FILE_ENCODING_UTF8 = "UTF_8";
    public static final String FILE_ENCODING_GBK = "GBK";
    public static final String FILE_ENCODING_GB2312 = "gb2312";

    /**
     * File filter, only directory and java file
     */
    private static FileFilter fileFilter = new FileFilter() {
        public boolean accept(File file) {
            //directory and java file
            return file.isDirectory() || (file.isFile() && file.getName().endsWith(FILE_EXTENTION_JAVA));
        }
    };

    /**
     * @param sourceDirectoryPath sourceDirectory
     * @param destDirectoryPath   destDirectory
     * @param sourceFileEncoding  sourceEncoding
     * @param destFileEncoding    destEncoding
     */
    public static void scanDirectory(String sourceDirectoryPath, String destDirectoryPath,
                                     String sourceFileEncoding, String destFileEncoding) {
        File destDirectory = new File(destDirectoryPath);
        if (!destDirectory.exists()) {
            destDirectory.mkdir();
        }

        File sourceDirectory = new File(sourceDirectoryPath);

        scanDirectory(sourceDirectory, sourceDirectoryPath, destDirectoryPath, sourceFileEncoding, destFileEncoding);
    }

    /**
     * @param directory           directory
     * @param sourceDirectoryPath sourceDirectory
     * @param destDirectoryPath   destDirectory
     * @param sourceFileEncoding  sourceEncoding
     * @param destFileEncoding    destEncoding
     */
    private static void scanDirectory(File directory, String sourceDirectoryPath, String destDirectoryPath,
                                      String sourceFileEncoding, String destFileEncoding) {
        File[] files = directory.listFiles(fileFilter);

        File destFile;
        for (File file : files) {
            if (file.isDirectory()) {
                destFile = new File(destDirectoryPath + file.getAbsolutePath().substring(sourceDirectoryPath.length()));
                if (!destFile.exists()) {
                    destFile.mkdir();
                }

                scanDirectory(file, sourceDirectoryPath, destDirectoryPath, sourceFileEncoding, destFileEncoding);
            } else {
                System.out.println("Source file：\t" + file.getAbsolutePath()
                        + "\nDest file：\t" + (destDirectoryPath + file.getAbsolutePath().substring(sourceDirectoryPath.length()))
                        + "\n-----------------------------------------------------------------");

                convertFile(file.getAbsolutePath(), destDirectoryPath + file.getAbsolutePath().substring(sourceDirectoryPath.length()),
                        sourceFileEncoding, destFileEncoding);
            }
        }
    }

    /**
     * @param sourceFilePath     sourceFilePath
     * @param destFilePath       destFilePath
     * @param sourceFileEncoding sourceFileEncoding
     * @param destFileEncoding   destFileEncoding
     */
    private static void convertFile(String sourceFilePath, String destFilePath,
                                    String sourceFileEncoding, String destFileEncoding) {
        InputStream in = System.in;
        OutputStream out = System.out;

        Reader reader = null;
        Writer writer = null;

        try {
            //set up byte streams
            if (sourceFilePath != null) {
                in = new FileInputStream(sourceFilePath);
            }

            if (destFilePath != null) {
                out = new FileOutputStream(destFilePath);
            }

            // Use default encoding if no encoding is specified.
            if (sourceFileEncoding == null)
                sourceFileEncoding = System.getProperty("file.encoding");
            if (destFileEncoding == null)
                destFileEncoding = System.getProperty("file.encoding");

            // Set up character stream
            reader = new BufferedReader(new InputStreamReader(in, sourceFileEncoding));
            writer = new BufferedWriter(new OutputStreamWriter(out, destFileEncoding));

            char[] buffer = new char[BUFFER_SIZE];
            int len;
            while ((len = reader.read(buffer)) != -1) {
                writer.write(buffer, 0, len);
            }
        } catch (Exception e) {
            e.printStackTrace();

        } finally {
            if (writer != null) {
                try {
                    writer.flush();
                    writer.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            if (reader != null) {
                try {
                    reader.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }

            try {
                in.close();
            } catch (IOException e) {
                e.printStackTrace();
            }

            try {
                out.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public static void main(String[] args) {
        String sourceDirectoryPath = "D:\\Lee\\Products\\insquery\\src";
        String destDirectoryPath = "D:\\Lee\\Products\\insquery\\dest";

        scanDirectory(sourceDirectoryPath, destDirectoryPath, FILE_ENCODING_GBK, FILE_ENCODING_UTF8);
    }
}