using System;
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using System.Web;
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using System.Text.RegularExpressions;
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using System.Web.UI.HtmlControls;
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using System.IO;
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using System.IO.Compression;
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using System.Web.UI.WebControls;
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using System.Text;
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using System.Collections.Generic;
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namespace HH.WMS.Utils
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{
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/// <summary>
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/// WEB请求上下文信息工具类
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/// </summary>
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public partial class ZHttp
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{
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#region 向客户端发送添加js文件
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/// <summary>
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/// 要添加的js文件的路径
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/// </summary>
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/// <param name="page">要添加js文件的页面</param>
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/// <param name="src">要添加的js文件的路径</param>
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public static void AddJsFile(System.Web.UI.Page page, string src)
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{
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HtmlGenericControl hc = new HtmlGenericControl("script");
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hc.Attributes.Add("type", "text/javascript");
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if (src.StartsWith("~"))
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{
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hc.Attributes.Add("src", page.ResolveClientUrl(src));
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}
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else
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{
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hc.Attributes.Add("src", src);
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}
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page.Header.Controls.Add(hc);
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}
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public static void RegisterJsToPage(System.Web.UI.Page page, string src)
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{
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if (!page.ClientScript.IsClientScriptBlockRegistered(src))
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page.ClientScript.RegisterClientScriptBlock(page.GetType(), src, String.Format("<script type=\"text/javascript\" src=\"{0}\"></script>", src));
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}
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public static void RegisterJsToPage(System.Web.UI.Page page, string key, string script)
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{
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if (!page.ClientScript.IsClientScriptBlockRegistered(key))
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page.ClientScript.RegisterClientScriptBlock(page.GetType(), key, script);
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}
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/// <summary>
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/// 要添加的js文件的路径
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/// </summary>
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/// <param name="page">要添加js文件的页面</param>
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/// <param name="src">要添加的js文件的路径</param>
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/// <param name="index">要添加的js文件在网页中的位置</param>
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public static void AddJsFile(System.Web.UI.Page page, string src, int index)
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{
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HtmlGenericControl hc = new HtmlGenericControl("script");
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hc.Attributes.Add("type", "text/javascript");
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if (src.StartsWith("~"))
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{
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hc.Attributes.Add("src", page.ResolveClientUrl(src));
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}
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else
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{
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hc.Attributes.Add("src", src);
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}
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page.Header.Controls.AddAt(index, hc);
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}
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#endregion
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#region 向客户端添加CSS文件
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/// <summary>
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/// 向客户端添加CSS文件
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/// </summary>
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/// <param name="page">要添加CSS文件的页面</param>
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/// <param name="href">要添加的CSS文件的路径</param>
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public static void AddCssFile(System.Web.UI.Page page, string href)
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{
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HtmlGenericControl hc = new HtmlGenericControl("link");
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hc.Attributes.Add("rel", "stylesheet");
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hc.Attributes.Add("type", "text/css");
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if (href.StartsWith("~"))
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{
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hc.Attributes.Add("href", page.ResolveClientUrl(href));
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}
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else
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{
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hc.Attributes.Add("href", href);
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}
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page.Header.Controls.Add(hc);
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}
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/// <summary>
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/// 向客户端添加CSS文件
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/// </summary>
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/// <param name="page">要添加CSS文件的页面</param>
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/// <param name="href">要添加的CSS文件的路径</param>
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/// <param name="index">要添加的CSS文件在网页中的位置</param>
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public static void AddCssFile(System.Web.UI.Page page, string href, int index)
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{
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HtmlGenericControl hc = new HtmlGenericControl("link");
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hc.Attributes.Add("rel", "stylesheet");
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hc.Attributes.Add("type", "text/css");
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if (href.StartsWith("~"))
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{
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hc.Attributes.Add("href", page.ResolveClientUrl(href));
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}
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else
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{
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hc.Attributes.Add("href", href);
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}
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page.Header.Controls.AddAt(index, hc);
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}
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#endregion
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#region 向客户端发送文件
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/// <summary>
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/// 向客户端发送文件(在.ashx文件中使用)
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/// </summary>
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/// <param name="context">上下文信息</param>
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/// <param name="fi">文件在服务器上信息</param>
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public static void ResponseFile(HttpContext context, System.IO.FileInfo fi)
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{
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ResponseFile(context, fi.Name, fi);
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}
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/// <summary>
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/// 向客户端发送文件(在.ashx文件中使用)
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/// </summary>
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/// <param name="context">上下文信息</param>
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/// <param name="fileName">文件在客户端保存的名称</param>
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/// <param name="fi">文件在服务器上信息</param>
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public static void ResponseFile(HttpContext context, string fileName, System.IO.FileInfo fi)
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{
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context.Response.Clear();
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context.Response.Buffer = false;
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context.Response.ContentType = GetContentType(fi.Extension);
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if (fi != null && fi.Exists)
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{
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if (context.Request.Browser.Browser.ToLower().Contains("ie")) //IE使用编码
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{
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context.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(context.Response.ContentEncoding.GetBytes(fileName)));
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}
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else //其它浏览器不使用编码
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{
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context.Response.AppendHeader("Content-Disposition", string.Format("attachment;filename=\"{0}\"", fileName));
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}
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context.Response.AddHeader("Connection", "Keep-Alive");
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context.Response.AddHeader("Accept-Ranges", "bytes");
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context.Response.Buffer = false;
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context.Response.Cache.SetLastModified(fi.LastWriteTime);
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context.Response.Cache.SetETag(fi.LastWriteTime.Ticks.ToString());
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//ETags和If-None-Match是一种常用的判断资源是否改变的方法。
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//类似于Last-Modified和HTTP-IF-MODIFIED-SINCE。
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//所不同的是Last-Modified和HTTP-IF-MODIFIED-SINCE只判断资源的最后修改时间，而ETags和If-None-Match可以是资源任何的任何属性，如资源的MD5等。
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if (context.Request.Headers["If-None-Match"] != null)
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{
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if (fi.LastWriteTime.Ticks.ToString() == context.Request.Headers["If-None-Match"])
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{
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context.Response.StatusCode = 304;
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context.Response.StatusDescription = "Not Modified";
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context.Response.End();
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return;
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}
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}
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//Last-Modified 与If-Modified-Since 都是用于记录页面最后修改时间的 HTTP 头信息，
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//Last-Modified 是由服务器往客户端发送的 HTTP 头，而 If-Modified-Since 则是由客户端往服务器发送的头
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if (context.Request.Headers["If-Modified-Since"] != null)
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{
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DateTime fromhttptime;
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DateTime.TryParse(context.Request.Headers["If-Modified-Since"], out fromhttptime);
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if (fi.LastWriteTime.ToString() == fromhttptime.ToString())
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{
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context.Response.StatusCode = 304;
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context.Response.StatusDescription = "Not Modified";
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return;
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}
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}
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using (FileStream fs = fi.OpenRead())
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{
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BinaryReader br = new BinaryReader(fs);
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try
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{
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int bufferlength = 5120;
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int currentlength = 0;
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byte[] buffer = new byte[bufferlength];
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context.Response.AddHeader("Content-Length", fs.Length.ToString());
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if (context.Response.IsClientConnected)
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{
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while (currentlength + bufferlength < fs.Length)
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{
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currentlength += br.Read(buffer, 0, buffer.Length);
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context.Response.BinaryWrite(buffer);
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}
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if (fs.Length - currentlength > 0)
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{
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buffer = new byte[fs.Length - currentlength];
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br.Read(buffer, 0, buffer.Length);
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context.Response.BinaryWrite(buffer);
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}
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}
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}
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catch
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{
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}
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finally
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{
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context.Response.OutputStream.Close();
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br.Close();
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fs.Close();
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}
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context.Response.Close();
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}
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}
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else
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{
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context.Response.StatusCode = 404;
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}
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}
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#endregion
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}
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}
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