<%-- Document : draw Created on : 2020-4-12, 7:19:39 Author : Administrator --%> <%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title> 取钱的表单页 </title> </head> <body> <!-- 取钱的表单 --> <form method="post" action="first.jsp"> 取钱：<input type="text" name="balance"> <input type="submit" value="提交"> </form> </body> </html>
<%-- Document : first2 Created on : 2020-4-12, 7:26:42 Author : Administrator --%> <%@page import="java.util.List"%> <%@page import="java.util.ArrayList"%> <%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title> request处理 </title> </head> <body> <% // 获取请求的钱数 String bal = request.getParameter("balance"); // 将钱数的字符串转换成双精度浮点数 double qian = Double.parseDouble(bal); // 对取出的钱进行判断 if (qian < 500) { out.println("给你" + qian + "块"); out.println("账户减少" + qian); } else { // 创建了一个List对象 List<String> info = new ArrayList<String>(); info.add("1111111"); info.add("2222222"); info.add("3333333"); // 将info对象放入request范围内 request.setAttribute("info", info); %> <!-- 实现转发 --> <jsp:forward page="second.jsp"/> <%}%> </body> </html>
<%-- Document : second Created on : 2020-4-12, 7:31:12 Author : Administrator --%> <%@page import="java.util.List"%> <%@page contentType="text/html" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title> request处理 </title> </head> <body> <% // 取出请求参数 String bal = request.getParameter("balance"); double qian = Double.parseDouble(bal); // 取出request范围内的info属性 List<String> info = (List<String>) request.getAttribute("info"); for (String tmp : info) { out.println(tmp + "<br/>"); } out.println("取钱" + qian + "块"); out.println("账户减少" + qian); %> </body> </html>
