根据这个答案，我应该保存字符串bcrypt哈希密码， passHash ，作为 BINARY 或者 BINARY(60) （我选择了 BINARY(60) )在mysql表中存储时（我将它存储在名为 passHash ).
现在当我选择并检索 passHash 列值从我的表转换成java，现在是一个 byte[] 数据类型。
然后如何将其转换回字符串形式，以便使用 validateLogin() 方法如下：

//Validate username and password login
    public boolean validateLogin(String username, String userpass) 
    {
        boolean status = false;  
        PreparedStatement pst = null; 
        ResultSet rs = null;  

        User user = new User(); //This is my Java bean class

        try(Connection connect= DBConnection.getConnection())
        {
            //Here, passHash is stored as VARBINARY(60) 
            pst = connect.prepareStatement("SELECT * FROM user WHERE username=? and passHash=?;"); 

            pst.setString(1, username);  
            pst.setString(2, userpass);  
            //Here's where I'm having difficulty because `passHash` column in my user table is VARBINARY(60) while `userpass` is a String

            rs = pst.executeQuery(); 
            status = rs.next();  
        } 

        catch (SQLException e) 
        {
            e.printStackTrace();
        }
            return status;  //status will return `true` if `username` and `userpass` matches what's in the columns
    }

参数 username 以及 userpass 用于在我的 Login.jsp 形式：

String username = request.getParameter("username");
String userpass = request.getParameter("userpass");

编辑：我的bcrypt代码如下：

//returns a hashed String value
public static String bCrypt (String passPlain) {
        return BCrypt.hashpw(passPlain, BCrypt.gensalt(10));
    }

//Returns a true if plain password is a match with hashed password
public static Boolean isMatch(String passPlain, String passHash){
        return (BCrypt.checkpw(passPlain, passHash));
    }