如何从Java中的p12获取证书序列号

Question

我需要使用证书在Java中签名xml。当我想获得证书序列号时，我得到null。我不想使用密钥库，因为我必须在oracle数据库上创建java存储过程，用存储在数据库文件系统上的指定证书对xml进行签名。

简短的例子

    public class FacObject
    {
        public string facilityID { get; set; }
        public string departmentID { get; set; }
        public string description { get; set; }
        public string block { get; set; }
        public string level { get; set; }
        public string name { get; set; }
        public string openHours { get; set; }
        public string closeHours { get; set; }
        public string maxBkTime { get; set; }
        public string maxBkUnits { get; set; }
        public string minBkTime { get; set; }
        public string minBkUnits { get; set; }

        public FacObject(string facid, string depid, string desc, string b, string l, string n
            ,string o ,string c, string maxt, string maxu, string mint, string minu)
        {
            this.facilityID = facid;
            this.departmentID = depid;
            this.description = desc;
            this.block = b;
            this.level = l;
            this.name = n;
            this.openHours = o;
            this.closeHours = c;
            this.maxBkTime = maxt;
            this.maxBkUnits = maxu;
            this.minBkTime = mint;
            this.minBkUnits = minu;
        }
    }

我必须在签名中提供序列号和发行人名称（签名xml）..

    protected void Page_Load(object sender, EventArgs e)
    {
        //To get the string to search in facility table
        string departmentID = Request.QueryString["DepartmentID"];
        string block = Request.QueryString["Block"];
        string level = Request.QueryString["Level"];
        string name = Request.QueryString["Name"];

        //creates a list of fac object
        List<FacObject> sqlFacList = new List<FacObject>();
        //test if correct 
        //Only select from a certain department
        //select the database for the list of facility that contains 
        //block, level, name (%)
        using (var db = new KioskContext())
        {
            var facilitys = from f in db.Facilitys
                            where f.Department.DepartmentID == departmentID
                            && (f.Block.Contains(block) && f.Level.Contains(level)
                            && f.Name.Contains(name))

                            orderby f.FacilityID
                            select new { f.FacilityID, f.DepartmentID, f.Description, f.Block,
                            f.Level, f.Name, f.OpenHours, f.CloseHours, f.MaxBkTime, f.MaxBkUnits, f.MinBkTime, f.MinBkUnits};

            foreach (var fac in facilitys)
            {
                FacObject facobject = new FacObject(fac.FacilityID, fac.DepartmentID, fac.Description, fac.Block, fac.Level,
                    fac.Name, fac.OpenHours, fac.CloseHours, fac.MaxBkTime, fac.MaxBkUnits, fac.MinBkTime, fac.MinBkUnits);
                sqlFacList.Add(facobject);
            }
        }

        //Serialize into json format output (string)
        string json = JsonConvert.SerializeObject(sqlFacList, Formatting.Indented);


        //codes to pass back the json string to the iPad
        Response.Write(json);
    }