我是在webcontent-login-下建了index.jsp,manager.jsp
在com.atguigu.login包中建立AddAServlet.java和User.java
注意点：
1/不是在同一个包或者文件中，所以在manager.jsp中我们用到User的方法什么的，要在head中引入<%@ page import="com.atguigu.login.User,java.util.List" %>
2/在一个项目的web.xml中可写多个servlet ,filter 通过action到哪个servlet,和servet的class 格外注意
3/ServletContext application=getServletContext(); application.setAttribute("users", user);
传说中的servlet 上下文servket和jsp中传递信息
index.jsp
<body> <form action="<%=request.getContextPath() %>/AddAServlet" method="post"> <table align="center" width="330"> <tr> <td align="center" colspan="2"> <b> 添加用户</b></td> </tr> <tr> <td>name:</td><td><input type="text" name="name"/></td> </tr> <tr> <td>address:</td><td><input type="text" name="add"/></td> </tr> <tr> <td align="center" colspan="2"><input type="submit" value="submit"/></td> </tr> </body>
AddAServlet .java
public class AddAServlet extends HttpServlet { private static final long serialVersionUID = 1L; protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String name=request.getParameter("name"); String add=request.getParameter("add"); User user=new User(); user.setName(name); user.setAddress(add); ServletContext application=getServletContext(); application.setAttribute("users", user); request.getRequestDispatcher("/login/manager.jsp").forward(request, response);; } }
web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0"> <display-name>Charactor</display-name> <welcome-file-list> <welcome-file>index.html</welcome-file> <welcome-file>index.htm</welcome-file> <welcome-file>index.jsp</welcome-file> <welcome-file>default.html</welcome-file> <welcome-file>default.htm</welcome-file> <welcome-file>default.jsp</welcome-file> </welcome-file-list> <filter> <filter-name>CharactorFilter</filter-name> <filter-class>com.atguigu.charactor.CharactorFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>UTF-8</param-value> </init-param> </filter> <filter-mapping> <filter-name>CharactorFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <servlet> <servlet-name>AddServlet</servlet-name> <servlet-class>com.atguigu.charactor.AddServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>AddServlet</servlet-name> <url-pattern>/AddServlet</url-pattern> </servlet-mapping> <servlet> <servlet-name>AddAServlet</servlet-name> <servlet-class>com.atguigu.login.AddAServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>AddAServlet</servlet-name> <url-pattern>/AddAServlet</url-pattern> </servlet-mapping> </web-app>
User.java
package com.atguigu.login; public class User { private String name; private String address; public String getName() { return name; } public void setName(String name) { this.name = name; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } }
manager.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <%@ page import="com.atguigu.login.User,java.util.List" %> </head> <body> <% User users=(User)application.getAttribute("users"); %> <%=users.getName() %> <%=users.getAddress() %> </body> </html>
