JavaWeb课后练习
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编写一个应用程序，可以让用户在窗体网页上输入名称、密码，若名称为caterpillar、密码为123456，则显示一个html页面响应并有“登录成功”字样，否则显示“登录失败”字样，并由一个超链接返回窗体网页。注意：不可在地址栏上出现用户输入的名称、密码。
一个Servlet，一个xml文件，还有三个jsp页面实现简单的功能。
package P45_2; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; public class LoginServlet extends HttpServlet { public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String use = request.getParameter("user");//获取文本框内容：用户名 String password = request.getParameter("password");//获取文本框内容：密码 if (use.equals("caterpillar") && password.equals("123456")) { request.getRequestDispatcher("/Success.jsp").forward(request,response);//跳转页面 }else { request.getRequestDispatcher("/Failure.jsp").forward(request,response); } } }
<?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"> <display-name>P45_2</display-name> <servlet> <servlet-name>LoginServlet</servlet-name> <servlet-class>P45_2.LoginServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>LoginServlet</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>login.jsp</welcome-file> </welcome-file-list> </web-app>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>登录失败</title>
</head>
<body>
<h1>登录失败</h1>
<a href = "login.jsp">点击返回</a>
</body>
</html>
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html> <html> <head> <title>登录界面</title> </head> <body> <form action="LoginServlet" method = "post"> <p>请输入用户名和密码<p> 用户名：<input type="text" name = "user" > 密码：<input type = "password" name = "password"> <input type = "submit" value = "登录"> </form> </body> </html>
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<title>登录成功</title>
</head>
<body>
<h1>登录成功！！！</h1>
</body>
</html>
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