这节课我们来做个登录功能
login.jsp:
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>登录</title> </head> <body style="text-align: center"> <form style="margin-top: 100px;border: 1px solid black;text-align: center" action="/login" method="post"> <input type="text" name="username" placeholder="用户名"><br><br> <input type="password" name="password" placeholder="密码"><br><br> <button type="submit">登录</button> </form> </body> </html>
login_success.jsp:
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>登录</title> </head> <body style="text-align: center"> <form style="margin-top: 100px;border: 1px solid black;text-align: center" action="/login" method="post"> <input type="text" name="username" placeholder="用户名"><br><br> <input type="password" name="password" placeholder="密码"><br><br> <button type="submit">登录</button> </form> </body> </html>
web.xml
<?xml version="1.0" encoding="UTF-8"?> <!--web-app 是整个web.xml的根标签，所有的配置都必须写在web-app里--> <web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd" version="4.0"> <!-- welcome-file 设置欢迎页 可以看到欢迎页面设置成功 --> <welcome-file-list> <welcome-file>/WEB-INF/login.jsp</welcome-file> </welcome-file-list> <!--配置LoginServlet与/login请求映射--> <servlet> <servlet-name>LoginServlet</servlet-name> <servlet-class>com.login.LoginServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>LoginServlet</servlet-name> <url-pattern>/login</url-pattern> </servlet-mapping> </web-app>
LoginServlet.java:
package com.login; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; //这个servlet用来处理登录请求 public class LoginServlet extends HttpServlet { String username = "xiaoye"; String password = "123456"; @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String username = req.getParameter("username"); String password = req.getParameter("password"); if (this.username.equals(username) && this.password.equals(password)) { //跳转到登录成功的页面 /** * 跳转页面使用request.getRequestDispatcher(要跳转的页面的路径).forward(request,response); */ req.getRequestDispatcher("/WEB-INF/login_success.jsp").forward(req,resp); //OK，成功了 } } }