Request对象浅析
Requst对象简介
ASP.NET Request对象功能是从客户端得到数据，常用的三种取得数据的用法是：Request.Form、Request.QueryString，Request。
Request.Form是POST传递方式。
R
QueryString
QueryString集合主要用于收集Http协议中的GET请求发送的数据，如果一个请求事件中，被请求的程序Url中出现“？”后的数据，则表示此次请求方式为Get。
Form
Form集合与QueryString类似，但它用于收集POST方法发送的请求数据(GET方法一般只能传递256字节的数据，而POST可以达到2M)。POST请求必须由Form来发送。
ServerVarible
ServerVarible(环境变量)集合包含了服务器和客户端的系统信息。
POST与GET方式对比
1. GET是从服务器上获取数据，POST是向服务器传送数据。
3. 对于GET方式，服务器端用Request.QueryString获取变量的值，对于POST方式，服务器端用Request.Form获取提交的数据。
4. GET传送的数据量较小，POST传送的数据量较大，一般被默认为不受限制。
5. GET安全性非常低，POST安全性较高。但是执行效率却比POST方法好。
下面来看看相关用法
1.使用QueryString
QueryStirng方法前台代码
1 <% @ Page Language = " C# " AutoEventWireup = " true " CodeFile = " ParamPage.aspx.cs " Inherits = " ParamPage " %>
2 <! DOCTYPE html PUBLIC " -//W3C//DTD XHTML 1.0 Transitional//EN " " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " >
3 < html xmlns = " http://www.w3.org/1999/xhtml " >
4 < head runat = " server " >
5 < title ></ title >
6
7 < script type = " text/javascript " >
8 function clickme() {
9 var wind = window.location.href( " ParamPage.aspx?param=newinfo " );
10 return false ;
11 }
12 </ script >
13 </ head >
14 < body >
15 < form id = " form1 " runat = " server " >
16 < div >
17 < input id = " htmlbutton " type = " button " value = " 传递参数 " onclick = " clickme() " />
18 </ div >
19 </ form >
20 </ body >
21 </ html >
QueryString后台代码
1 using System;
2
3 public partial class ParamPage : System.Web.UI.Page
4 {
5 protected void Page_Load( object sender, EventArgs e)
6 {
7 if ( ! string .IsNullOrEmpty(Request.QueryString[ " param " ]))
8 {
9 Response.Write(Request.QueryString[ " param " ]);
10 }
11 }
12 }
运行结果：
2.获取Form参数
Form表单前台
1 <% @ Page Language = " C# " AutoEventWireup = " true " CodeFile = " ParamPage.aspx.cs " Inherits = " ParamPage " %>
2
3 <! DOCTYPE html PUBLIC " -//W3C//DTD XHTML 1.0 Transitional//EN " " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " >
4 < html xmlns = " http://www.w3.org/1999/xhtml " >
5 < head runat = " server " >
6 < title ></ title >
7 </ head >
8 < body >
9 < form id = " form1 " runat = " server " >
10 < div >
11 < asp:TextBox ID = " asp_tb " runat = " server " Text = "" ></ asp:TextBox >
12 < input id = " html_input " type = " text " value = "" name = " html_input " />
13 < asp:Button ID = " btn_submit " runat = " server " Text = " 提交 " />
14 </ div >
15 </ form >
16 </ body >
17 </ html >
18
Form表单后台
1 using System;
2
3 public partial class ParamPage : System.Web.UI.Page
4 {
5 protected void Page_Load( object sender, EventArgs e)
6 {
7 if ( ! string .IsNullOrEmpty(Request[ " asp_tb " ]))
8 Response.Write(Request[ " asp_tb " ] + " <br/> " );
9 if ( ! string .IsNullOrEmpty(Request.Params[ " asp_tb " ]))
10 Response.Write(Request.Params[ " asp_tb " ] + " <br/> " );
11 if ( ! string .IsNullOrEmpty(Request.Form[ " asp_tb " ]))
12 Response.Write(Request.Form[ " asp_tb " ] + " <br/> " );
13
14 if ( ! string .IsNullOrEmpty(Request[ " html_input " ]))
15 Response.Write(Request[ " html_input " ] + " <br/> " );
16 if ( ! string .IsNullOrEmpty(Request.Form[ " html_input " ]))
17 Response.Write(Request.Form[ " html_input " ] + " <br/> " );
18 if ( ! string .IsNullOrEmpty(Request.Params[ " html_input " ]))
19 Response.Write(Request.Params[ " html_input " ] + " <br/> " );
20 }
21 }
22
运行结果：
执行：
3.获取ServerVarible及其他
ServerVariables及其他前台
1 <% @ Page Language = " C# " AutoEventWireup = " true " CodeFile = " ParamPage.aspx.cs " Inherits = " ParamPage " %>
2
3 <! DOCTYPE html PUBLIC " -//W3C//DTD XHTML 1.0 Transitional//EN " " http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd " >
4 < html xmlns = " http://www.w3.org/1999/xhtml " >
5 < head runat = " server " >
6 < title ></ title >
7
8 < script type = " text/javascript " >
9 function clickme() {
10 var wind = window.location.href( " ParamPage.aspx?param=newinfo " );
11 }
12 </ script >
13
14 </ head >
15 < body >
16 < form id = " form1 " runat = " server " >
17 < div >
18 < input id = " Button1 " type = " button " value = " Click " onclick = " clickme() " />
19 </ div >
20 </ form >
21 </ body >
22 </ html >
23
ServerVariables及其他后台
1 using System;
2
3 public partial class ParamPage : System.Web.UI.Page
4 {
5 protected void Page_Load( object sender, EventArgs e)
6 {
7 // 当前浏览器版本IE 7
8 // 客户端
9 Response.Write( " <br>获取客户端浏览器版本号： " + Request.ServerVariables[ " HTTP_USER_AGENT " ]);
10 Response.Write( " <br>获取客户端IP地址： " + Request.ServerVariables[ " REMOTE_ADDR " ]);
11 Response.Write( " <br>获取客户端所使用语言： " + Request.ServerVariables[ " HTTP_ACCEPT_LANGUAGE " ]);
12 Response.Write( " <br>获取请求的方法： " + Request.ServerVariables[ " REQUEST_MOTHOD " ]);
13 Response.Write( " <br>获取请求信息的内容的总符数： " + Request.ServerVariables[ " CONTENT_LENGTH " ]);
14 Response.Write( " <br>获取请求信息类型： " + Request.ServerVariables[ " CONTENT_TYPE " ]);
15 Response.Write( " <br>获取URL的附加信息： " + Request.ServerVariables[ " QUERY_STRING " ]);
16 Response.Write( " <br>获取网关接口： " + Request.ServerVariables[ " GATEWAY_INTERFACE " ]);
17
18 // 服务器
19 Response.Write( " <br>获取服务器IP地址： " + Request.ServerVariables[ " LOCAL_ADDR " ]);
20 Response.Write( " <br>获取服务器的主机名： " + Request.ServerVariables[ " SERVER_NAME " ]);
21 Response.Write( " <br>获取当前执行程序的虚拟目录： " + Request.ServerVariables[ " PATH_INFO " ]);
22 Response.Write( " <br>获取当前执行程序的绝对路径： " + Request.ServerVariables[ " PATH_TRANSLATED " ]);
23 Response.Write( " <br>获取当前程序的文件名(包含虚拟路径)： " + Request.ServerVariables[ " SCRIPT_NAME " ]);
24 Response.Write( " <br>获取服务器接受请求的端口： " + Request.ServerVariables[ " SERVER_PORT " ]);
25 Response.Write( " <br>获取服务器遵从的协议及版本号： " + Request.ServerVariables[ " SERVER_PROTOCAL " ]);
26
27 // Browser对象
28 Response.Write( " <br>检查浏览器的类型： " + Request.Browser.Browser);
29 Response.Write( " <br>检查浏览器的版本： " + Request.Browser.Version);
30 Response.Write( " <br>检查浏览器是否支持ActiveX控件： " + Request.Browser.ActiveXControls);
31 Response.Write( " <br>检查浏览器是否支持Cookies： " + Request.Browser.Cookies);
32 Response.Write( " <br>检查浏览器是否支持VBScript： " + Request.Browser.VBScript);
33
34 // 其他
35 Response.Write( " <br>客户端浏览器的版本: " + Request.UserAgent);
36 Response.Write( " <br>当前网页虚拟路径： " + Request.RawUrl);
37 Response.Write( " <br>当前网页虚拟路径： " + Request.ServerVariables[ " url " ]);
38 Response.Write( " <br>实际目录： " + Request.PhysicalApplicationPath);
39 Response.Write( " <br>实际地址： " + Request.PhysicalPath);
40 Response.Write( " <br>实际地址： " + Request.ServerVariables[ " path_translated " ]);
41 Response.Write( " <br>服务器名： " + Request.ServerVariables[ " server_name " ]);
42 Response.Write( " <br>服务器IP： " + Request.UserHostName);
43 Response.Write( " <br>服务器IP： " + Request.UserHostAddress);
44 Response.Write( " <br>服务器传送方式： " + Request.RequestType);
45 Response.Write( " <br>当前浏览器是否支持背景音乐： " + Request.Browser.BackgroundSounds);
46 Response.Write( " <br>浏览器是否支持框架 " + Request.Browser.Frames);
47 Response.Write( " <br>当前使用的操作系统 " + Request.Browser.Platform);
48 }
49 }
50
运行结果：
