JSP的request对象

一 request对象定义

客户端的请求信息被封装在request对象中，通过它才能了解客户的需求，然后做出响应。它是HttpServletRequest类的实例。request对象具有请求域，即完成客户端的请求之前，该对象一直有效。

二 request对象方法

三实例

<%@ page language = "java" import = "java.util.*" contentType = "text/html; charset=utf-8" %>

String path = request.getContextPath();

String basePath = request.getScheme()+ "://" +request.getServerName()+ ":" +request.getServerPort()+path+ "/" ;

<! DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

< html >

< head >

< base href = " <%= basePath %> " >

< title > My JSP 'index.jsp' starting page </ title >

< meta http-equiv = "pragma" content = "no-cache" >

< meta http-equiv = "cache-control" content = "no-cache" >

< meta http-equiv = "expires" content = "0" >

< meta http-equiv = "keywords" content = "keyword1,keyword2,keyword3" >

< meta http-equiv = "description" content = "This is my page" >

<!--

-->

</ head >

< body >

< h1 > request内置对象 </ h1 >

request.setCharacterEncoding( "utf-8" ); //解决中文乱码问题，无法解决URL传递中文出现的乱码问题。

request.setAttribute( "password" , "123456" );

用户名： <%= request.getParameter( "username" ) %>

爱好： <%

if (request.getParameterValues( "favorite" )!= null )

{

String[] favorites = request.getParameterValues( "favorite" );

for ( int i=0;i<favorites.length;i++)

{

out.println(favorites[i]+ "  " );

}

%>

密码： <%= request.getAttribute( "password" ) %>

请求体的MIME类型: <%= request.getContentType() %>

协议类型及版本号: <%= request.getProtocol() %>

服务器主机名 : <%= request.getServerName() %>

服务器端口号： <%= request.getServerPort() %>

请求文件的长度： <%= request.getContentLength() %>

请求客户端的IP地址： <%= request.getRemoteAddr() %>

请求的真实路径： <%= request. getRealPath( "request.jsp" ) %>

请求的上下文路径： <%= request.getContextPath() %>

</ body >

</ html >

四运行效果

五小知识点

1、解决URL传递中文参数乱码问题

修改D:\apache-tomcat-7.0.81\conf中的server.xml

<Connector port="8888" protocol="HTTP/1.1"

connectionTimeout="20000"

redirectPort="8443" URIEncoding=" utf-8 "/>

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