public class CharUtil {
    /**
     * 將字串轉換成相應的字元編碼
     * @param s
     * @return
     */
    public static String bytes2HexString(String s) {
        byte[] b = s.getBytes();
        s = "";
        for (int i = 0; i < b.length; i++) {
            String hex = Integer.toHexString(b[i] & 0xFF);
            if (hex.length() == 1) {
                hex = '0' + hex;
            }
            s = s + hex.toUpperCase();
        }
        return s;
    }

    /**
     * 隨機生成漢字
     * @return
     */
    public static String getRandomChar() {
        String str = "";
        int highCode;
        int lowCode;

        Random random = new Random();

        highCode = (176 + Math.abs(random.nextInt(39))); //B0 + 0~39(16~55) 一級漢字所佔區
        lowCode = (161 + Math.abs(random.nextInt(93))); //A1 + 0~93 每區有94個漢字

        byte[] b = new byte[2];
        b[0] = (Integer.valueOf(highCode)).byteValue();
        b[1] = (Integer.valueOf(lowCode)).byteValue();

        try {
            str = new String(b, "GBK");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return str;
    }

    /**
     * 隨機生成2-4個字的名字
     * @return
     */
    public static String getRandomName() {
        Random random = new Random();
        //名字的個數
        int charNum = random.nextInt(4) % 3 + 2;
        String resultName = "";
        for (int i= 0 ; i<charNum; i++) {
            String nameWord = getRandomChar();
            resultName += nameWord;
        }
        return resultName;
    }
 

直接調方法中getRandomName()方法就行。