XML中的二进制文件的编码与解码[原创]

(一)把二进制文件放到XML中

using System;
using System.Data;
using System.IO;
using System.Text;
using System.Xml;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class OutPutXML : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        int readByte = 0;
        int filesize = 0;
        FileStream fs = new FileStream("C:\\060407color01.jpg", FileMode.Open);
        filesize = Convert.ToInt32(fs.Length);
        string filepath = Server.MapPath(Request.ApplicationPath) + "\\" + System.Configuration.ConfigurationManager.AppSettings["UploadDir"].ToString() + "\\" + "test.xml";
        int index = fs.Name.LastIndexOf("\\") + 1;
        string filename = fs.Name.Substring(index, (fs.Name.Length - index));

        BinaryReader br = new BinaryReader(fs);
        XmlTextWriter wt = new XmlTextWriter(filepath, Encoding.UTF8);

        wt.WriteStartDocument();
        wt.WriteStartElement("Upload");
        wt.WriteStartElement("username", "guest");
        wt.WriteEndElement();
        wt.WriteStartElement("password", "123456");
        wt.WriteEndElement();
        wt.WriteStartElement("file");
        wt.WriteAttributeString("size", filesize.ToString()); //文件的大小
        wt.WriteAttributeString("name", filename);//文件名

        //以base64编码文件,并添加到XML中的元素中
        byte[] base64buffer = new byte[filesize];
        do
        {
            readByte = br.Read(base64buffer, 0, filesize);
            wt.WriteBase64(base64buffer, 0, readByte);
        } while (filesize <= readByte);

        wt.WriteEndElement();
        wt.WriteEndElement();
        wt.WriteEndDocument();
        wt.Close();
        fs.Close();
        br.Close();
    }
}

(二)从XML中读出数据、解码、保存

using System;
using System.IO;
using System.Data;
using System.Text;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Xml;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using PowerEasy.BLL;
using Power.Model;
using Power.Rss;

public partial class Rss_Upload : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        int readByte = 0;
        int filesize = 0;
        string username = string.Empty;
        string password = string.Empty;
        string uploadPath = Server.MapPath(Request.ApplicationPath) + "\\"+ System.Configuration.ConfigurationManager.AppSettings["UploadDir"].ToString()+"\\";
        string filename = string.Empty;
        string newFileName = string.Empty;
        string exName = string.Empty; //扩展名
        ProblemXML xml = new ProblemXML();
        BinaryWriter bw = null;
        FileStream fs = null;
        XmlTextReader xmlrd = null;

        xmlrd = new XmlTextReader(uploadPath + "test.xml");//Request.InputStream
        
        try
        {
            while (xmlrd.Read())
            {
                if (xmlrd.NodeType == XmlNodeType.Element && xmlrd.Name == "username") 
                {
                    username = xmlrd.GetAttribute(0).Trim();
                }
                if (xmlrd.NodeType == XmlNodeType.Element && xmlrd.Name == "password")
                {
                    password = xmlrd.GetAttribute(0).Trim();
                    if (!xml.CheckUser(username, password))
                    {
                        xml.PutInfo(ProblemXML.UPLOAD_ERR, ProblemXML.INPUT_PASSWORD_ERROR);
                        return;
                    }
                }
               
                if (xmlrd.NodeType == XmlNodeType.Element && xmlrd.Name.Trim() == "file")
                {
                    try
                    {
                        filesize = Convert.ToInt32(xmlrd.GetAttribute("size"));
                        filename = xmlrd.GetAttribute("name");
                        exName = CommonFunction.FileValidator(filename);
                        if (exName == string.Empty) 
                        {
                            xml.PutInfo(ProblemXML.UPLOAD_ERR,"上传的文件只可以是 JPG 、GIF 、BMP 、PNG 、ZIP 、RAR 类型! ");
                            return;
                        }
                        newFileName = DateTime.Now.Ticks.ToString() + "."+exName;
                        fs = new FileStream(uploadPath + newFileName , FileMode.Create);
                        bw = new BinaryWriter(fs);
                        byte[] base64buffer = new byte[filesize];
                        do
                        {
                            readByte = xmlrd.ReadBase64(base64buffer, 0, filesize);
                            bw.Write(base64buffer, 0, readByte);

                        } while (readByte >= filesize);
                        bw.Close();
                        fs.Close();
                    }
                    catch (Exception ex1)
                    {
                        xml.PutInfo(ProblemXML.UPLOAD_ERR,ex1.Message);
                        return;
                    }
                }//end of if
            }//end of while
           
        }
        catch 
        {
            //hrow new Exception(ex2.Message);
            xml.PutInfo(ProblemXML.UPLOAD_ERR, ProblemXML.INPUT_ERROR);
            return;
        }
        finally
        {
            xmlrd.Close();
        }

        if (File.Exists(uploadPath + newFileName))
        {
            xml.PutInfo(ProblemXML.UPLOAD_OK, newFileName);
        }
        else 
        {
            xml.PutInfo(ProblemXML.UPLOAD_ERR, ProblemXML.UPLOAD_ERR_INFO);
        }
      
    }

}