request对象和response对象(8)

来源：未知责任编辑：责任编辑发表时间:2014-05-10 12:18　点击:次

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p>/Request/servlet/RequestDemo1 ---- 都是URI 不是URL

p>2)获得当前访问资源路径：

p>request.getRequestURI().substring(request.getContextPath().length());

p>2.获取请求头信息

p>getHeader 获得头信息的值，转换一个字符串

p>getHeaders 获得头信息值，获得Enumeration

p>getHeaderNames 获得所有头信息名称返回 Enumeration

p>eg:

p>复制代码

p>package cn.lsl.request;

p>import java.io.IOException;

p>import java.util.Enumeration;

p>import javax.servlet.ServletException;

p>import javax.servlet.http.HttpServlet;

p>import javax.servlet.http.HttpServletRequest;

p>import javax.servlet.http.HttpServletResponse;

p>public class RequestDemo2 extends HttpServlet {

p> public void doGet(HttpServletRequest request, HttpServletResponse response)

p> throws ServletException, IOException {

p> //获取指定头信息字段

p> String value = request.getHeader("Accept-Encoding");

p> System.out.println(value);

p> System.out.println("---------------");

p> //获得所有头信息内容

p> Enumeration<String> enumeration = request.getHeaderNames();

p> while(enumeration.hasMoreElements()){

p> String name = enumeration.nextElement();

p> System.out.println(name+":"+request.getHeader(name));

p> }

p> public void doPost(HttpServletRequest request, HttpServletResponse response)

p> throws ServletException, IOException {

p> doGet(request,response);

p> }

p>}

p>复制代码

p>3.防盗链程序

p>referer.html

p>复制代码

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

p><html>

p> <head>

p> <title>referer.html</title>

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

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

p> <meta http-equiv="content-type" content="text/html; charset=UTF-8">

p> </head>

p> <body>

p> <h1>通过链接访问RequestDemo3 不是盗链</h1>

p> <a href="/Request/servlet/RequestDemo3">link</a>

p> </body>

p></html>

p>复制代码

p>package cn.lsl.request;

request对象和response对象(8)

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