1 <%@page contentType="text/html" pageEncoding="UTF-8"%> 2 <!DOCTYPE html> 3 <html> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> 6 <title>数据输入页面</title> 7 </head> 8 <body> 9 <form action="servlet/Verify" method="post"> 10 请输入一个实数：<input type="text" name="number"> 11 <input Type="submit" value="确定"> 12 </form> 13 </body> 14 </html>
1 package servlet;
2
3 import java.io.IOException;
4 import java.io.PrintWriter;
5
6 import javax.servlet.RequestDispatcher;
7 import javax.servlet.ServletException;
8 import javax.servlet.http.HttpServlet;
9 import javax.servlet.http.HttpServletRequest;
10 import javax.servlet.http.HttpServletResponse;
11
12 public class Verify extends HttpServlet {
13 public Verify() {
14 super();
15 }
16
17 public void destroy() {
18 super.destroy(); // Just puts "destroy" string in log
19 }
20
21 public void doGet(HttpServletRequest request, HttpServletResponse response)
22 throws ServletException, IOException {
23 doPost(request, response);
24 }
25
26 public void doPost(HttpServletRequest request, HttpServletResponse response)
27 throws ServletException, IOException {
28 String number = request.getParameter("number");
29 try {
30 // 把字符串转换为Double
31 double n = Double.parseDouble(number);
32 if (n > 6000 || n < -6000) {
33 // 重定向到sendForward.jsp
34 response.sendRedirect("sendForward.jsp");
35 } else {
36 RequestDispatcher rd = request.getRequestDispatcher("ShowMessage");
37 // 转发到另一个servlet文件
38 rd.forward(request, response);
39 }
40 } catch (NumberFormatException ex) {
41 // 重定向到sendForward.jsp
42 response.sendRedirect("sendForward.jsp");
43 }
44 }
45
46 public void init() throws ServletException {
47 }
48 }
1 package servlet;
2
3 import java.io.IOException;
4 import java.io.PrintWriter;
5
6 import javax.servlet.ServletException;
7 import javax.servlet.http.HttpServlet;
8 import javax.servlet.http.HttpServletRequest;
9 import javax.servlet.http.HttpServletResponse;
10
11 public class ShowMessage extends HttpServlet {
12 public ShowMessage() {
13 super();
14 }
15
16 public void init() throws ServletException {
17 }
18
19 public void doGet(HttpServletRequest request, HttpServletResponse response)
20 throws ServletException, IOException {
21 doPost(request, response);
22 }
23
24 public void doPost(HttpServletRequest request, HttpServletResponse response)
25 throws ServletException, IOException {
26 response.setContentType("text/html; charset=UTF8");
27 PrintWriter out = response.getWriter();
28 // 获取客户提交的信息
29 String number = request.getParameter("number");
30 double n = Double.parseDouble(number);
31 out.println(number + "的平方为：" + (n * n));
32 }
33
34 public void destroy() {
35 super.destroy(); // Just puts "destroy" string in log
36 }
37 }
1 <?xml version="1.0" encoding="UTF-8"?> 2 <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN" "http://java.sun.com/dtd/web-app_2_3.dtd"> 3 <web-app> 4 <servlet> 5 <servlet-name>Verify</servlet-name> 6 <servlet-class>servlet.Verify</servlet-class> 7 </servlet> 8 <servlet> 9 <servlet-name>ShowMessage</servlet-name> 10 <display-name>This is the display name of my J2EE component</display-name> 11 <description>This is the description of my J2EE component</description> 12 <servlet-class>servlet.ShowMessage</servlet-class> 13 </servlet> 14 15 <servlet-mapping> 16 <servlet-name>Verify</servlet-name> 17 <url-pattern>/servlet/Verify</url-pattern> 18 </servlet-mapping> 19 <servlet-mapping> 20 <servlet-name>ShowMessage</servlet-name> 21 <url-pattern>/servlet/ShowMessage</url-pattern> 22 </servlet-mapping> 23 </web-app>
时间： 2024-10-06 08:47:37