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AES加密及解密(请注意方法说明和方法使用) public class AesUtil { static { Security.addProvider(new BouncyCastleProvider());

生成哈希值 // 哈希函数/散列算法 // 根据某个值进行hash值计算，确保唯一性 public class HashUtils { private static final String ALGORITHM = "SHA-25

为什么会出现索引索引的出现是为了提高数据查询的效率，就像书的目录一样 索引的常见模型哈希表哈希表是一种以键-值(key-value)存储数据的结构，我们只需要输入待查找的键即key，就可以找到对应的value值。哈希的思路很简单，把值放到

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