上传图片以二进制插入到数据库,且读取显示

来源：互联网发布：三国志13优化编辑：程序博客网时间：2024/04/27 14:39

前台shangchuan.aspx代码:
<%@ Page language="c#" Codebehind="shangchuan.aspx.cs" AutoEventWireup="false" Inherits="hualong.allknow.shangchuan" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
  <title>shangchuan</title>
  <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
  <meta name="CODE_LANGUAGE" Content="C#">
  <meta name="vs_defaultClientScript" content="JavaScript">
  <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<BODY bgcolor="#ffffff">
  <FORM ENCTYPE="multipart/form-data" RUNAT="server" ID="Form1">
   <TABLE RUNAT="server" WIDTH="700" ALIGN="left" ID="Table1" cellpadding="0" cellspacing="0"
    border="0">
    <TR>
     <TD>上传图片(选择你要上传的图片)</TD>
     <TD>
      <INPUT TYPE="file" RUNAT="server" STYLE="WIDTH:320px" ACCEPT="text/*" NAME="up_file" id="up_file">
     </TD>
    </TR>
    <TR>
     <TD>
      文件说明(添加上传图片说明，如：作者、出处)
     </TD>
     <TD>
      <asp:TextBox RUNAT="server" WIDTH="239" ID="txtDescription" MAINTAINSTATE="false" />
     </TD>
    </TR>
    <TR>
     <TD>
      <asp:Label RUNAT="server" ID="txtMessage" FORECOLOR="red" MAINTAINSTATE="false" />
     </TD>
     <TD>
      <asp:Button RUNAT="server" WIDTH="239" TEXT="Upload Image" ID="Button1" />
     </TD>
    </TR>
   </TABLE>
  </FORM>
</BODY>
</HTML>

下面是后台shangchuan.aspx.cs代码:
using System;
using System.Web;
using System.IO;
using System.Data;
using System.Data.SqlClient;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace hualong.allknow
{
/// <summary>
/// shangchuan 的摘要说明。
/// </summary>
public class shangchuan : System.Web.UI.Page
{
  protected System.Web.UI.WebControls.TextBox txtDescription;
  protected System.Web.UI.WebControls.Label txtMessage;
  protected System.Web.UI.WebControls.Button Button1;
  protected System.Web.UI.HtmlControls.HtmlInputFile up_file;
  protected Int32 fileLength = 0;

  private void Page_Load(object sender, System.EventArgs e)
  {
   // 在此处放置用户代码以初始化页面
  }

  #region Web 窗体设计器生成的代码
  override protected void OnInit(EventArgs e)
  {
   //
   // CODEGEN: 该调用是 ASP.NET Web 窗体设计器所必需的。
   //
   InitializeComponent();
   base.OnInit(e);
  }

  /// <summary>
  /// 设计器支持所需的方法 - 不要使用代码编辑器修改
  /// 此方法的内容。
  /// </summary>
  private void InitializeComponent()
  {
   this.Button1.Click += new System.EventHandler(this.Button1_Click);
   this.Load += new System.EventHandler(this.Page_Load);

}
#endregion

  private void Button1_Click(object sender, System.EventArgs e)
  {
      HttpPostedFile upFile = up_file.PostedFile;//HttpPostedFile对象,用来读取上传图片的属性
            fileLength = upFile.ContentLength;//记录文件的长度
   try
   {
    if(fileLength==0)//当文件长度为0的时候
    {
     txtMessage.Text = "请选择要上传的文件!";
    }
    else
    {
     byte[] fileByte = new byte[fileLength];//用图片的长度来初始化一个字节数组存储临时的图片文件
     Stream fileStream = upFile.InputStream;//建立文件流对象
     fileStream.Read(fileByte,0,fileLength);//读取图片数据到临时存储体fileByte,0为数据指针位置,fileLength为数据长度
     string connString = "Data Source=192.168.1.250;database=image;uid=pwqzc;pwd=cn0088";
     SqlConnection conn = new SqlConnection(connString);//初始化数据库连接
     string insertStr = "insert into image (image_data,image_content_type,image_description,image_size) values (@image_data,@image_content_type,@image_description,@image_size)";
     //插入数据库语句
     SqlCommand comm = new SqlCommand(insertStr,conn);
     comm.Parameters.Add(new SqlParameter("@image_data",SqlDbType.Image));//添加参数
     comm.Parameters["@image_data"].Value = fileByte;//给参数赋值
     comm.Parameters.Add(new SqlParameter("@image_content_type",SqlDbType.VarChar,50));
     comm.Parameters["@image_content_type"].Value = upFile.ContentType;//记录图片类型
     comm.Parameters.Add(new SqlParameter("@image_description",SqlDbType.VarChar,50));
     comm.Parameters["@image_description"].Value = txtDescription.Text;//把其他的表单数据上传
     comm.Parameters.Add(new SqlParameter("@image_size",SqlDbType.Int,4));
     comm.Parameters["@image_size"].Value = upFile.ContentLength;//记录图片长度,读取数据的时候使用
     conn.Open();//打开数据库连接
     comm.ExecuteNonQuery();//添加数据
     conn.Close();//关闭数据库
     txtMessage.Text = "你已经成功的上传了图片";
    }
   }
   catch(Exception ex)
   {
       txtMessage.Text = ex.Message.ToString();
   }
  }
}
}

下面是读取代码:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

namespace hualong.allknow
{
/// <summary>
/// readimage 的摘要说明。
/// </summary>
public class readimage : System.Web.UI.Page
{
  private void Page_Load(object sender, System.EventArgs e)
  {
   // 在此处放置用户代码以初始化页面
   int imgId = int.Parse(Request.QueryString["imgId"]);//imgId为图片的id
   //建立数据库连接
   string connString = "server=192.168.1.250;database=image;uid=pwqzc;pwd=cn0088";
   SqlConnection conn = new SqlConnection(connString);
   //数据库操作语句
   string selString = "select * from image where image_id = @image_id";
   SqlCommand comm = new SqlCommand(selString,conn);
   comm.Parameters.Add(new SqlParameter("@image_id",SqlDbType.Int,4));
   comm.Parameters["@image_id"].Value = imgId;
   conn.Open();//打开数据库连接
   SqlDataReader dr = comm.ExecuteReader();//读出数据
   dr.Read();//读一行
   //设定输出文件的类型
   Response.ContentType = (string)dr["image_content_type"];
   //输出图片文件二进制数据
   Response.OutputStream.Write((byte[])dr["image_data"],0,(int)dr["image_size"]);
   Response.End();
   dr.Close();
   conn.Close();
  }

  }
  #endregion
}
}

下面是显示代码xianshi.aspx:
<%@ Page language="c#" Codebehind="xianshi.aspx.cs" AutoEventWireup="false" Inherits="hualong.allknow.xianshi" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<HTML>
<HEAD>
  <title>xianshi</title>
  <meta name="GENERATOR" Content="Microsoft Visual Studio .NET 7.1">
  <meta name="CODE_LANGUAGE" Content="C#">
  <meta name="vs_defaultClientScript" content="JavaScript">
  <meta name="vs_targetSchema" content="http://schemas.microsoft.com/intellisense/ie5">
</HEAD>
<body MS_POSITIONING="GridLayout">
  <form id="Form1" method="post" runat="server">
   <img src="readimage.aspx?imgId=1">
  </form>
</body>
</HTML>