Java Web学习(30)： Servlet学习(三)

       Servlet获取JSP九大内置对象

        Servlet与JSP九大内置对象对应关系：

        

       Servlet与表单

        Servlet如何获取表单数据呢？

        我们就不再一一讲解，具体的可以参考：http://www.runoob.com/servlet/servlet-form-data.html

        实例：获取表单数据

        实体类Users代码：

package com.entity;import java.util.Date;/** * 用户实体类 * @author Administrator * @date 2016年7月25日 */public class Users {private String username; //用户名private String password; //密码private String email; //电子邮箱private String gender; //性别private Date birthday; //出生日期private String[] favorites; //爱好private String introduce; //自我介绍private boolean flag; //是否接受协议public Users() {}public String getUsername() {return username;}public void setUsername(String username) {this.username = username;}public String getPassword() {return password;}public void setPassword(String password) {this.password = password;}public String getEmail() {return email;}public void setEmail(String email) {this.email = email;}public String getGender() {return gender;}public void setGender(String gender) {this.gender = gender;}public Date getBirthday() {return birthday;}public void setBirthday(Date birthday) {this.birthday = birthday;}public String[] getFavorites() {return favorites;}public void setFavorites(String[] favorites) {this.favorites = favorites;}public String getIntroduce() {return introduce;}public void setIntroduce(String introduce) {this.introduce = introduce;}public boolean getFlag() {return flag;}public void setFlag(boolean flag) {this.flag = flag;}}

        Servlet层的RegServlet代码：  

package com.servlet;import java.io.IOException;import java.text.SimpleDateFormat;import java.util.Date;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import com.entity.Users;/** * Servlet implementation class RegServlet */@WebServlet("/RegServlet")public class RegServlet extends HttpServlet {private static final long serialVersionUID = 1L;           /**     * @see HttpServlet#HttpServlet()     */    public RegServlet() {        super();        // TODO Auto-generated constructor stub    }/** * @see Servlet#init(ServletConfig) */public void init(ServletConfig config) throws ServletException {// TODO Auto-generated method stub}/** * @see Servlet#destroy() */public void destroy() {// TODO Auto-generated method stub}/** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stubdoPost(request,response);}/** * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response) */protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {// TODO Auto-generated method stub//防止中文乱码        request.setCharacterEncoding("UTF-8");Users user = new Users();String username;String password;String gender;String email;String introduce;String flag;//是否接受协议Date birthday;String[] favorites;SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");try{username = request.getParameter("username");password = request.getParameter("password");gender = request.getParameter("gender");email = request.getParameter("email");introduce = request.getParameter("introduce");//需要注意类型转化birthday = sdf.parse(request.getParameter("birthday"));//这个也比较特殊，需要注意if(request.getParameterValues("flag")!=null){flag = request.getParameter("flag");}else{flag = "false";}//用来获取多个复选按钮的值favorites = request.getParameterValues("favorite");user.setUsername(username);user.setPassword(password);user.setGender(gender);user.setEmail(email);user.setFavorites(favorites);user.setIntroduce(introduce);//特殊if(flag.equals("true")){user.setFlag(true);}else{user.setFlag(false);}user.setBirthday(birthday);//把注册成功的用户对象保存在session对象中request.getSession().setAttribute("regUser", user);//跳转到注册成功页面request.getRequestDispatcher("userinfo.jsp").forward(request,response);}catch(Exception e){e.printStackTrace();}}}

        注册页面reg.jsp页面代码：

<%@ 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>注册页面</title><style type="text/css">.label {width: 20%}.controler {width: 80%}</style>  <script type="text/javascript" src="js/Calendar3.js"></script></head><body><h1>用户注册</h1><hr><form name="regForm" action="RegServlet" method="post"><table border="0" width="800" cellspacing="0" cellpadding="0"><tr><td class="lalel">用户名：</td><td class="controler">    <input type="text" name="username" /></td></tr><tr><td class="label">密码：</td><td class="controler">     <input type="password" name="password" /></td></tr><tr><td class="label">确认密码：</td><td class="controler">      <input type="password" name="confirmpass" /></td></tr><tr><td class="label">电子邮箱：</td><td class="controler">    <input type="text" name="email" /></td></tr><tr><td class="label">性别：</td><td class="controler">    <input type="radio" name="gender" checked="checked" value="Male" />男    <input type="radio" name="gender" value="Female" />女</td></tr><tr><td class="label">出生日期：</td><td class="controler">      <input name="birthday" type="text" id="control_date" size="10" maxlength="10" onclick="new Calendar().show(this);" readonly="readonly" /></td></tr><tr><td class="label">爱好：</td><td class="controler">     <input type="checkbox" name="favorite" value="nba" /> NBA &nbsp;      <input type="checkbox" name="favorite" value="music" /> 音乐 &nbsp;      <input type="checkbox" name="favorite" value="movie" /> 电影 &nbsp;      <input type="checkbox" name="favorite" value="internet" /> 上网 &nbsp;</td></tr><tr><td class="label">自我介绍：</td><td class="controler">     <textarea name="introduce" rows="10" cols="40"></textarea></td></tr><tr><td class="label">接受协议：</td><td class="controler">     <input type="checkbox" name="flag" value="true" />是否接受霸王条款</td></tr><tr><td colspan="2" align="center">     <input type="submit" value="注册" />&nbsp;&nbsp; <input type="reset" value="取消" />&nbsp;&nbsp;</td></tr></table></form></body></html>

        用户信息界面userinfo.jsp页面代码：

<%@page import="java.text.SimpleDateFormat"%><%@ 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>用户信息页面</title><style type="text/css">.title {width: 30%;background-color: #CCC;font-weight: bold;}.content {width: 70%;background-color: #CBCFE5;}</style> </head><body><h1>用户信息</h1><hr><center><jsp:useBean id="regUser" class="com.entity.Users" scope="session" /><table width="600" cellpadding="0" cellspacing="0" border="1"><tr><td class="title">用户名：</td><td class="content">&nbsp;<jsp:getProperty name="regUser" property="username" /></td></tr><tr><td class="title">密码：</td><td class="content">&nbsp;<jsp:getProperty name="regUser" property="password" /></td></tr><tr><td class="title">性别：</td><td class="content">&nbsp;<jsp:getProperty name="regUser" property="gender" /></td></tr><tr><td class="title">E-mail：</td><td class="content">&nbsp;<jsp:getProperty name="regUser" property="email" /></td></tr><tr><td class="title">出生日期：</td><td class="content">&nbsp;         <%                               SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日");                              String date = sdf.format(regUser.getBirthday());                         %>                          <%=date%></td></tr><tr><td class="title">爱好：</td><td class="content">&nbsp; <%                       String[] favorites = regUser.getFavorites();                      for(String fav:favorites){                %>                 <%=fav%>                 &nbsp;&nbsp;                 <%                        }                 %></td></tr><tr><td class="title">自我介绍：</td><td class="content">&nbsp;<jsp:getProperty name="regUser" property="introduce" /></td></tr><tr><td class="title">是否介绍协议：</td><td class="content">&nbsp;<jsp:getProperty name="regUser" property="flag" /></td></tr></table></center></body></html>

        运行结果：

        用户注册页面：

        

        用户信息界面：