产生n位16进制型字符串

---

源码

	 /**
     * 产生一个length为长度字符串，每一位是一个Hex。
     * @param length
     * @return
     */
    public static String getRandomHexString(int length) {
        SecureRandom secureRandom = Holder.numberGenerator;
        int size = length / 2;
        byte[] randomBytes = new byte[size];

        secureRandom.nextBytes(randomBytes);

        //字节数组转16进制并转化为小写
        return DatatypeConverter.printHexBinary(randomBytes).toLowerCase();

    }

    /*
     * The random number generator used by this class to create random
     * based UUIDs. In a holder class to defer initialization until needed.
     */
    private static class Holder {
        static final SecureRandom numberGenerator = new SecureRandom();
    }

测试代码：

	   for(int i=0;i<5;i++){
           System.out.println(getRandomHexString(10));
       }

       System.out.println();
        for(int i=0;i<5;i++){
            System.out.println(getRandomHexString(10));
        }

运行结果：

02aec4facb
2e9e3617e5
7620df4774
0a0ce56657
654d6b4bf2

42d9f18dcc
3c65114944
68f70b2751
d4ba485578
fc8563ab9a

参考文献

Java中Random为什么需要随机因子？
java类uuid源码分析