javaweb创建一个数的阶乘jsp
时间: 2024-09-10 17:16:47 浏览: 57
在Java Web中,创建一个计算数字阶乘的JSP页面,你需要结合Servlet或JavaScript来实现这个功能。以下是一个简单的步骤:
1. **创建JSP页面**(index.jsp):
```html
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>计算阶乘</title>
</head>
<body>
<h1>请输入一个数字:</h1>
<form action="CalculateFactorial" method="post">
Number: <input type="number" id="num" name="number"><br><br>
<input type="submit" value="计算阶乘">
</form>
<%@ include file="result.jsp" %>
</body>
</html>
```
这里,用户输入数字并提交表单到名为`CalculateFactorial`的Servlet。
2. **创建Servlet(CalculateFactorial.java)**:
```java
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class CalculateFactorial extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int number = Integer.parseInt(request.getParameter("number"));
long factorial = calculateFactorial(number);
request.setAttribute("factorial", factorial);
RequestDispatcher dispatcher = getServletContext()..getRequestDispatcher("result.jsp");
dispatcher.forward(request, response);
}
private long calculateFactorial(int n) {
if (n == 0 || n == 1)
return 1;
else
return n * calculateFactorial(n - 1);
}
}
```
在这个Servlet中,我们从请求获取输入的数字,然后计算阶乘,并将结果存入request中,然后转发到result.jsp。
3. **处理结果的JSP文件(result.jsp)**:
```html
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%>
<html>
<head>
<jsp:include page="header.jsp"></jsp:include>
<title>阶乘结果显示</title>
</head>
<body>
<p>The factorial of <%= request.getAttribute("factorial") %> is <%= request.getAttribute("factorial") %>!</p>
</body>
</html>
```
在这里,我们显示计算出的阶乘值。
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