字符串转化 nicode utf8 转化汉字

   /**
     * 字符串转化为unicode
     * @param gbString
     * @return
     */
    public static String encodeUnicode(final String gbString) {
        char[] utfBytes = gbString.toCharArray();
        String unicodeBytes = "";
        for (int byteIndex = 0; byteIndex < utfBytes.length; byteIndex++) {
            String hexB = Integer.toHexString(utfBytes[byteIndex]);
            if (hexB.length() <= 2) {
                hexB = "00" + hexB;
            }
            //unicodeBytes = unicodeBytes + "\\u" + hexB;
            unicodeBytes = unicodeBytes + hexB;
        }
        System.out.println(unicodeBytes);
        return unicodeBytes;
    }

    // unicode转化汉字
    public static StringBuffer decodeUnicode(String utfStr) {
        final StringBuffer buffer = new StringBuffer();
        String charStr = "";
        String operStr = utfStr;
        for(int i =0 ; i < utfStr.length() ;i=+4){
            charStr = operStr.substring(0, 4);
            operStr = operStr.substring(4, operStr.length());
            char letter = (char) Integer.parseInt(charStr, 16);
            buffer.append(new Character(letter).toString());
        }
        return buffer;
    }
    /**
     * 信息按长度截取
     * @param messages
     * @param length 截取长度
     * @param vmsg
     * @return
     */
    public static Vector<String> splitString(String messages, int length, Vector<String> vmsg) {
        if (messages.length() <= length) {
            vmsg.add(messages);
        } else {
            vmsg.add(messages.substring(0, length));
            messages = messages.substring(length);
            vmsg = splitString(messages,length,vmsg);
        }

        return vmsg;
    } 
    /**
     * 用utf-8格式保存文件
     * @param fileName
     * @param msg
     */
    public static void outputFile(String fileName, String msg) {
        File file = getFileByFileName(fileName);
        Writer ow = null;
        try {
            // FileWriter fw = new FileWriter(file);
            // fw.write(msg);
            // fw.flush();
//            byte[] bytes = msg.getBytes("GBK");
//            String str = new String(bytes, "GBK");
            // OutputStream os = new FileOutputStream(file);
            // os.write(bytes);
            // os.close();
            ow = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
            ow.write(msg);
        } catch (IOException e) {
            System.out.println(e);
        } finally {
            //关闭reader
            if (null != ow) {
                try {
                    ow.close();
                } catch (IOException e) {
                    System.out.println(e);
                }
            }
        }
    }