HttpServletRequest

HttpServletRequest类主要处理：
1.读取和写入HTTP头标
2.取得和设置cookies
3.取得路径信息
4.标识HTTP会话。


HttpServletRequest接口中的方法      
String getAuthType()     如果servlet由一个鉴定方案所保护，如HTTP基本鉴定，则返回方案名称。      
String getContextPath()     返回指定servlet上下文（web应用）的URL的前缀。      
Cookie[] getCookies()     返回与请求相关cookie的一个数组。      
Long getDateHeader(String name)     将输出转换成适合构建Date对象的long类型取值的getHeader()的简化版。      
String getHeader(String name)     返回指定的HTTP头标指。如果其由请求给出，则名字应为大小写不敏感。      
Enumeration getHeaderNames()     返回请求给出的所有HTTP头标名称的权举值。      
Enumeration getHeaders(String name)     返回请求给出的指定类型的所有HTTP头标的名称的枚举值，它对具有多取值的头标非常有用。      
int getIntHeader(String name)     将输出转换为int取值的getHeader()的简化版。      
String getMethod()     返回HTTP请求方法（例如GET、POST等等）      
String getPathInfo()     返回在URL中指定的任意附加路径信息。      
String getPathTranslated()     返回在URL中指定的任意附加路径信息，被子转换成一个实际路径。      
String getQueryString()     返回查询字符串，即URL中?后面的部份。      
String getRemoteUser()     如果用户通过鉴定，返回远程用户名，否则为null。      
String getRequestedSessionId()     返回客户端的会话ID      
String getRequestURI()     返回URL中一部分，从“/”开始，包括上下文，但不包括任意查询字符串。      
String getServletPath()     返回请求URI上下文后的子串      
HttpSession getSession()     调用getSession(true)的简化版。      
HttpSession getSession(boolean create)     返回当前HTTP会话，如果不存在，则创建一个新的会话，create参数为true。      
Principal getPrincipal()     如果用户通过鉴定，返回代表当前用户的java.security.Principal对象，否则为null。      
boolean isRequestedSessionIdFromCookie()     如果请求的会话ID由一个Cookie对象提供，则返回true，否则为false。      
boolean isRequestedSessionIdFromURL()     如果请求的会话ID在请求URL中解码，返回true，否则为false      
boolean isRequestedSessionIdValid()     如果客户端返回的会话ID仍然有效，则返回true。      
Boolean isUserInRole(String role)     如果当前已通过鉴定用户与指定角色相关，则返回true，如果不是或用户未通过鉴定，则返回false。 



<%@page import="javax.servlet.http.HttpServletRequest"%>


out.println("Protocol: " + request.getProtocol() + "<br>");
out.println("Scheme: " + request.getScheme() + "<br>");
out.println("Server Name: " + request.getServerName() + "<br>" );
out.println("Server Port: " + request.getServerPort() + "<br>");
out.println("Protocol: " + request.getProtocol() + "<br>");
out.println("Server Info: " + getServletConfig().getServletContext().getServerInfo()+ "<br>"); out.println("Remote Addr: " + request.getRemoteAddr() + "<br>");
out.println("Remote Host: " + request.getRemoteHost() + "<br> ");
out.println("Character Encoding: " + request.getCharacterEncoding() + "<br>");
out.println("Content Length: " + request.getContentLength() + "<br>");
out.println("Content Type: "+ request.getContentType() + "<br>");
out.println("Auth Type: " + request.getAuthType() + "<br>");
out.println("HTTP Method: " + request.getMethod() + "<br>");
out.println("Path Info: " + request.getPathInfo() + "<br>");
out.println("Path Trans: " + request.getPathTranslated() + "<br>");
out.println("Query String: " + request.getQueryString() + "<br>");
out.println("Remote User: " + request.getRemoteUser() + "<br>");
out.println("Session Id: " + request.getRequestedSessionId() + "<br>");
out.println("Request URI: " + request.getRequestURI() + "<br>");
out.println("Servlet Path: " + request.getServletPath() + "<br>");
out.println("Accept: " + request.getHeader("Accept")+ "<br>");
out.println("Host: " + request.getHeader("Host") + "<br>");
out.println("Referer : " + request.getHeader("Referer") + "<br>");
out.println("Accept-Language : " + request.getHeader("Accept-Language")+ "<br>");
out.println("Accept-Encoding : " + request.getHeader("Accept-Encoding") + "<br>");
out.println("User-Agent : " + request.getHeader("User-Agent") + "<br>");
out.println("Connection : " + request.getHeader("Connection") + "<br>");
//out.println("Cookie : " + request.getHeader("Cookie") + "<br> ");
out.println("Created : " + session.getCreationTime() + "<br> ");
out.println("LastAccessed : " + session.getLastAccessedTime() + "<br>");
 


结果页面：

Protocol: HTTP/1.1
Scheme: http
Server Name: chery.zicp.com
Server Port: 8080
Protocol: HTTP/1.1
Server Info: Apache Tomcat/5.5.25
Remote Addr: 192.168.1.101
Remote Host: 192.168.1.101
Character Encoding: null
Content Length: -1
Content Type: null
Auth Type: null
HTTP Method: GET
Path Info: null
Path Trans: null
Query String: null
Remote User: null
Session Id: 9EF52BA6DED2337D3E091B63BC667AA8
Request URI: /service/main.jsp
Servlet Path: /service/main.jsp
Accept: */*
Host: chery.jc0553.com:8080
Referer : http://chery.zicp.com:8080/service/cheryindex.jsp
Accept-Language : zh-cn
Accept-Encoding : gzip, deflate
User-Agent : Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.2; SV1; TencentTraveler ; .NET CLR 1.1.4322; .NET CLR 2.0.50727; .NET CLR 3.0.04506.30)
Connection : Keep-Alive
Created : 1197958062906
LastAccessed : 1197965081500