<%--
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>
