java.io.IOException Import;
Import java.util.Enumeration;
Import javax.servlet.ServletException;
Import the javax.servlet.http.HttpServlet;
Import the javax.servlet.http.HttpServletRequest;
Import javax.servlet.http.HttpServletResponse;
/ * *
* learning Object request:
* role: request object currently mothballed all requested information
* use:
* get request header data
* req.getMethod (); // get request method
* req.getRequestURI (); // acquisition request URI of the
* req.getRequestURL (); // get requests the URL of
* req.getScheme (); // get agreement
*
* get the request line data
* req.getHeader ( "key name"); // returns the specified request header information
* req.getHeaderNames ( "User-Agent") ; // returns the requested head key name enumerations
*
*
Req.getHeaderNames the Enumeration = E * ();
the while (e.hasMoreElements ()) {
String name = (String) e.nextElement ();
String req.getHeader value2 = (name);
System.out.println (e.nextElement () + ":" + name);
* Get the user data
* req.getParameter ( "keys"); // returns the specified user data
* req.getParameterValues ( "keys"); // return the same value in different key the request data (multiple choice), returned array
* req.getParameterNames (); // return all user requests to enumerate a collection of data
*
* Note: If you want to get the data request does not complain does not exist, return null
*
* Note :
* when Tomcat server object is created by request, and passed as an argument to the service method of the servlet processing request.
*
*
* @Author Administrator
*
* /
public class RequestServlet the extends the HttpServlet {
@Override
// get all the data request line enumeration
void-Service protected (the HttpServletRequest REQ, the HttpServletResponse RESP)
throws ServletException, IOException {
// Get request header data
// Get request method
String Method req.getMethod = ();
System.out.println (Method);
// get request the URL
the StringBuffer = req.getRequestURL URL ();
System.out.println (URL);
// Get the URI
String URI = req.getRequestURI ();
System.out.println (URI);
// Get request protocol
String schem = req.getScheme ();
System.out.println (Schem);
// row data acquisition request
String value = req.getHeader ( "the User-- Agent");
System.out.println (value);
the Enumeration req.getHeaderNames E = ();
the while (e.hasMoreElements ()) {
String name = (String) e.nextElement ();
String req.getHeader value2 = (name);
System.out.println (e.nextElement () + ":" + name);
// Get the user data
String = req.getParameter NAME1 ( "the uname");
String pwd = req.getParameter ( "pwd");
System.out.println (NAME1 + ":" + pwd);
// String FAV = REQ. getParameter ( "fav"); leak value extraction use an array
String [] = favs req.getParameterValues ( "FAV");
IF (favs = null!) {
for (String FAV: favs) {
System.out.println ( FAV);
}
}
// get the user requests an enumeration of all the keys of the data set req.getParameterNames ------ ();
}
}
}
requestservlet.java
<%@ page language="java" import="java.util.*" pageEncoding="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 'MethodJsp.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">
<!--
<link rel="stylesheet" type="text/css" href="styles.css">
-->
</head>
<body>
<form action="req" method="post">
用户名:<input type="text" name="uname" value=""><br />
密码:<input type="password" name="pwd" value=""><br />
爱好：<br />
<input type="checkbox" name="fav" value="1">唱歌<br />
<input type="checkbox" name="fav" value="2">跳舞<br />
<input type="checkbox" name="fav" value="3">泡妞<br />
<input type="submit" value="登录">
</form>
</body>
</html>
jsp page
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>servletlife</servlet-name>
<servlet-class>com.sxt.in.servletlife</servlet-class>
<load-on-startup>1</load-on-startup><!- load the server boot loading sequence in which 1 represents a stream of digital items ->
<the servlet>
</ the servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>ServletMethod</servlet-name>
<servlet-class>com.sxt.in.ServletMethod</servlet-class>
</servlet>
<servlet>
<description>This is the description of my J2EE component</description>
<display-name>This is the display name of my J2EE component</display-name>
<servlet-name>RequestServlet</servlet-name>
<servlet-class>com.sxt.in.RequestServlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>servletlife</servlet-name>
<url-pattern>/life</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>ServletMethod</servlet-name>
<url-pattern>/method</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>RequestServlet</servlet-name>
<url-pattern>/req</url-pattern>
</servlet-mapping>
</web-app>
xml page