java随机汉字生成

private static String getRandomChinese(){
		Random random = new Random();
		int code1,code2,code3,code4;//分别代表四个位码
		String checkCode = "";
		String[] rBase = {"0","1","2","3","4","5","6","7","8","9","a","b","c","d","e","f"};

		code1 = random.nextInt(3) +11;
		String str_r1 = rBase[code1];//获得第一个位码

		if(code1 == 13) {
		code2 = random.nextInt(7);
		}
		else {
		code2 = random.nextInt(16);
		}
		String str_r2 = rBase[code2];//第二个位码

		code3 = random.nextInt(6) + 10;
		String str_r3 = rBase[code3];//第三个位码

		if(code3 == 10) {
		code4 = random.nextInt(15) + 1;
		}
		else if(code3 ==15) {
		code4 = random.nextInt(15);
		}
		else {
		code4 = random.nextInt(16);
		}
		String str_r4 = rBase[code4];//第四个位码

		byte[] bytes = new byte[2];
		String str_r12 = str_r1 + str_r2;
		int tempLow = Integer.parseInt(str_r12, 16);
		bytes[0] = (byte) tempLow;//低位字节

		String str_r34 = str_r3 + str_r4;
		int tempHigh = Integer.parseInt(str_r34, 16);
		bytes[1] = (byte) tempHigh;//高位字节

		checkCode = new String(bytes);//生成汉字
		return checkCode;
		}