request (请求转发)
index.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>登录</title> </head> <body> <h1>登录</h1> <div> <%--这里表单的意思是:以post方式提交表单,提交到login请求中--%> <from action="${pageContext.request.getContextPath()}/login" method="post"> 用户名:<input type="text" name="username"><br> 密 码:<input type="text" name="password"><br> 爱 好: <input type="checkbox" name="hobbys" value="女孩">女孩 <input type="checkbox" name="hobbys" value="代码">代码 <input type="checkbox" name="hobbys" value="唱歌">唱歌 <input type="checkbox" name="hobbys" value="电影">电影 <br> <input type="submit"> </from> </div> </body> </html>
实现类:LoginServlet
package com.king.servlet; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; import java.util.Arrays; public class LoginServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { String username = req.getParameter("username"); String password = req.getParameter("password"); String[] hobbys = req.getParameterValues("hobbys"); System.out.println("=================================="); System.out.println(username); System.out.println(password); System.out.println(Arrays.toString(hobbys)); System.out.println("=================================="); System.out.println(req.getContextPath()); //通过请求转发 req.getRequestDispatcher("/success.jsp").forward(req,resp); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { doGet(req, resp); } }
转发成功页面
<%@ page contentType="text/html;charset=UTF-8" language="java" %> <html> <head> <title>Title</title> </head> <body> <h1>登陆成功</h1> </body> </html>
配置web
<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" metadata-complete="true"> <servlet> <servlet-name>login</servlet-name> <servlet-class>com.king.servlet.LoginServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>login</servlet-name> <url-pattern>/login</url-pattern> </servlet-mapping> </web-app>