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JSP内置对象：getattribute（）方法获得数据

2017-07-11 17:40 483 查看

一共有四个页面：getattribute1，2，3。

getattribute为输入数字页面，2为结果页。3计算出和，4计算乘积。

int value=(Integer)request.getAttribute(“mynum”);

getattribute可以直接强制转换得到整形数。而getparameter得到的是字符串，必须转换。

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<form action="getattribute11.jsp">
输入整数[1-10]：<input type="text" name="num" /><br><br>

<input type="submit" value="ok">

</form>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
String s=request.getParameter("num");
request.setAttribute("mynum", Integer.parseInt(s));
%>
和：<jsp:include page="getattribute2.jsp"></jsp:include><br>

积：<jsp:include page="getattribute3.jsp"></jsp:include>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
int value=(Integer)request.getAttribute("mynum");
int sum=0;
for(int i=1;i<=value;i++)
sum+=i;
out.print(sum);
%>
</body>
</html>

<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
</head>
<body>
<%
int value=(Integer)request.getAttribute("mynum");
int sum=1;
for(int i=1;i<=value;i++)
sum*=i;
out.print(sum);
%>
</body>
</html>

a0a2

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