JavaWeb获得存取域的数据

旧城等待， 2023-06-19 14:27 2阅读 0赞

package com.my.servlet;
 
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.util.Enumeration;
 
 import javax.servlet.ServletException;
 import javax.servlet.annotation.WebServlet;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;
 
 import com.sun.org.apache.bcel.internal.generic.NEW;
 
 import mydata.People;
 
 /**
 * Servlet implementation class RequestScopeAttrServlet
 */
 @WebServlet("/RequestScopeAttrServlet")
 public class RequestScopeAttrServlet extends HttpServlet {
 	private static final long serialVersionUID = 1L;
 
 /**
 * @see HttpServlet#HttpServlet()
 */
 public RequestScopeAttrServlet() {
 super();
 }
 
 	/**
 	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
 	 */
 	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 		response.setContentType("text/html;charset=UTF-8");
 		request.setAttribute("people", new People("张三",30));
 		request.setAttribute("msg","请求域中的string属性");
 		People people = (People)request.getAttribute("people");
 		String msg = (String)request.getAttribute("msg");
 		PrintWriter out = response.getWriter();
 		out.println("request.getAttribute(\"people\"的值)："+people+"");
 		out.println("request.getAttribute(\"msg\"的值)："+msg+"");
 		
 		//获得所有的属性
 		Enumeration<String> names = request.getAttributeNames();
 		out.println("");
 		while(names.hasMoreElements()) {
 			out.println(names.nextElement()+" ");
 		}
 		out.println("");
 		
 		
 		request.removeAttribute("people");
 		out.println("删除people后：");
 		names = request.getAttributeNames();
 		out.println("");
 		while(names.hasMoreElements()) {
 			out.println(names.nextElement()+" ");
 		}
 		out.println("");
 		out.flush();
 		out.close();
 	}
 
 	/**
 	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
 	 */
 	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
 		// TODO Auto-generated method stub
 		doGet(request, response);
 	}
 
 }