帮我写一个jsp页面和一个servlet程序在jsp页面输入一个自然数用servlet生成一个杨辉三角形矩阵并输入到页面
时间: 2023-03-25 19:02:53 浏览: 114
编写jsp页面实现如下界面效果,然后交给servlet计算矩形的周长和面积,并输出结果。
好的,我可以回答这个问题。以下是jsp页面和servlet程序的代码:
jsp页面代码:
```html
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>杨辉三角形矩阵生成器</title>
</head>
<body>
<h1>杨辉三角形矩阵生成器</h1>
<form action="generateTriangle" method="post">
<label for="num">请输入一个自然数:</label>
<input type="number" id="num" name="num" required>
<button type="submit">生成</button>
</form>
<div>
<% if(request.getAttribute("triangle") != null) { %>
<pre><%= request.getAttribute("triangle") %></pre>
<% } %>
</div>
</body>
</html>
```
servlet程序代码:
```java
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/generateTriangle")
public class GenerateTriangleServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
int num = Integer.parseInt(request.getParameter("num"));
int[][] triangle = new int[num][num];
for(int i = ; i < num; i++) {
for(int j = ; j <= i; j++) {
if(j == || j == i) {
triangle[i][j] = 1;
} else {
triangle[i][j] = triangle[i-1][j-1] + triangle[i-1][j];
}
}
}
StringBuilder sb = new StringBuilder();
for(int i = ; i < num; i++) {
for(int j = ; j <= i; j++) {
sb.append(triangle[i][j]).append(" ");
}
sb.append("\n");
}
request.setAttribute("triangle", sb.toString());
request.getRequestDispatcher("index.jsp").forward(request, response);
}
}
```
当用户在jsp页面中输入一个自然数并点击“生成”按钮时,servlet程序会生成一个对应的杨辉三角形矩阵,并将其作为一个字符串存储在request对象中,然后将request对象转发到原始的jsp页面中,最终在页面上显示出杨辉三角形矩阵。
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