HttpServletRequ接口的使用和jsp内置对象的request对象非常类似，request对象其实
就是HttpServletRequest接口的一个实例，不过气实例化的过程是自动的，无须自定义。
以下示例达到的效果为：通过一个HttpServletRequest接口的实利化对象设置并取得
request范围属性的示例。
RequestDemo.java
1 package com.mhb; 2 3 import java.io.IOException; 4 import java.io.PrintWriter; 5 6 import javax.servlet.ServletException; 7 import javax.servlet.http.HttpServlet; 8 import javax.servlet.http.HttpServletRequest; 9 import javax.servlet.http.HttpServletResponse; 10 11 public class RequestDemo extends HttpServlet { 12 13 public void init() throws ServletException { 14 } 15 public void doGet(HttpServletRequest request, HttpServletResponse response) 16 throws ServletException, IOException { 17 18 //设置输出内容的格式和编码 19 response.setContentType("text/html;charset=gb2312"); 20 PrintWriter out = response.getWriter(); 21 22 //存储在request范围内 23 request.setAttribute("name", "测试者"); 24 //取得request范围name的属性 25 String name = (String) request.getAttribute("name"); 26 27 out.println("<html>"); 28 out.println("<body>"); 29 out.println("name:"+name); 30 out.println("</body>"); 31 out.println("</html>"); 32 33 } 34 public void doPost(HttpServletRequest request, HttpServletResponse response) 35 throws ServletException, IOException { 36 } 37 public void destroy() { 38 super.destroy(); 39 } 40 }
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