java make FileWriter FileReaderはエンコード形式なし、OutputStreamWriter InputStreamReaderはエンコード形式を設定できる。

private static boolean copyFile(String src, String des) {  
    InputStreamReader fr = ;  
    OutputStreamWriter fw = ;  
    try {  
        fr = new InputStreamReader(new FileInputStream(src),"UTF-8");//read  
        fw = new OutputStreamWriter(new FileOutputStream(des), "UTF-8");//write  
        char[] buf = new char[1024];//buffer  
        int len;  
        while ((len = fr.read(buf)) ! = -1) {  
            fw.write(buf, 0, len);//read a few write a few  
        }  
        return true;  
    } catch (IOException e) {  
        LOG.error(e.getMessage());  
        return false;  
    } finally {  
        if (fr ! = ) { try {  
            try {  
                fr.close();  
            } catch (IOException e) {  
                LOG.error(e.getMessage());  
            }  
        }  
        if (fw ! = ) {  
            try {  
                fw.flush();  
                fw.close();  
            } catch (IOException e) {  
                LOG.error(e.getMessage());  
            }  
        }  
    }  
}