Servlet基础(3)
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Servlet获取表单数据
首先有两个静态页面,reg.jsp和userinfo.jsp,分别是注册页面和注册成功之后显示注册信息的页面。
<%@ page language="java" import="java.util.*" contentType="text/html; charset=utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>"> <title>My JSP 'reg.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> <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="servlet/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="mypassword" ></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 <input type="checkbox" name="favorite" value="music"> 音乐 <input type="checkbox" name="favorite" value="movie"> 电影 <input type="checkbox" name="favorite" value="internet"> 上网 </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="isAccept" value="true">是否接受霸王条款 </td> </tr> <tr> <td colspan="2" align="center"> <input type="submit" value="注册"/> <input type="reset" value="取消"/> </td> </tr> </table> </form> </body></html>
<%@ page language="java" import="java.util.*,java.text.*" contentType="text/html; charset=utf-8"%><%String path = request.getContextPath();String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";%><!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"><html> <head> <base href="<%=basePath%>"> <title>My JSP 'userinfo.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> <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="entity.Users" scope="session"/> <table width="600" cellpadding="0" cellspacing="0" border="1"> <tr> <td class="title">用户名:</td> <td class="content"> <jsp:getProperty name="regUser" property="username"/></td> </tr> <tr> <td class="title">密码:</td> <td class="content"> <jsp:getProperty name="regUser" property="mypassword"/></td> </tr> <tr> <td class="title">性别:</td> <td class="content"> <jsp:getProperty name="regUser" property="gender"/></td> </tr> <tr> <td class="title">E-mail:</td> <td class="content"> <jsp:getProperty name="regUser" property="email"/></td> </tr> <tr> <td class="title">出生日期:</td> <td class="content"> <% 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"> <% String[] favorites = regUser.getFavorites(); for(String f:favorites) { %> <%=f%> <% } %> </td> </tr> <tr> <td class="title">自我介绍:</td> <td class="content"> <jsp:getProperty name="regUser" property="introduce"/></td> </tr> <tr> <td class="title">是否介绍协议:</td> <td class="content"> <jsp:getProperty name="regUser" property="flag"/></td> </tr> </table> </center> </body></html>
为了提交用户注册表单,我们建一个实体类(entity.Users),里边的属性应该为私有并且与表单里的一一对应。之后要将这些字段封装一下,右键->source->Generate Getters and Setters,全部都封装一下。之后最好再写一下不带参数的构造函数。字段的代码如下
private String username; //用户名 private String mypassword; //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
然后要做一个处理用户注册的Servlet类,这里包名为servlet,类名为RegServlet,所以reg.jsp中的表单的action也对应为servlet/RegServlet。
由于表单是post方式请求,所以在doPost方法里处理。首先为了保证可以注册中文的信息,我们指定用utf-8。request.setCharacterEncoding("utf-8");
然后既然是用户注册所以要先创建用户的实体类。Users u = new Users();
再接收每个传过来的变量,如何接收?
以username为例,先设置一个变量String username;然后username=request.getParameter("username");
,其他的变量都使用同样的方法。
不过Date类型的比较特殊,要首先进行转换,SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
,之后birthday = sdf.parse(request.getParameter("birthday"));
。
而对于字符串数组,使用的就不是request.getParameter而是request.getParameterValues。
然后我们将这些获取到的值传入到生成的用户对象当中,还是以username为例,u.setUsername(username);
,这里的set方法就是之前封装字段时候的set方法。这里要注意,Boolean类型的变量最好不要用is开头,可以就用Flag,这样可以避免一些问题。
赋值完之后就是跳转,我们可以使用服务器内部跳转的方式跳转到注册成功页面request.getRequestDispatcher("../userinfo.jsp").forward(request,response);
。这里..表示要跳转到外边一层的目录下,之后就可以在跳转到的页面来获取信息。在跳转之前要把注册成功的用户对象保存在session中request.getSession().setAttribute("regUser", u);
这里的regUser是起的名字,把对象u给传进去。
整个完整的代码如下
package servlet;import java.io.IOException;import java.io.PrintWriter;import java.text.SimpleDateFormat;import java.util.Date;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import entity.Users;public class RegServlet extends HttpServlet { /** * Constructor of the object. */ public RegServlet() { super(); } /** * Destruction of the servlet. <br> */ public void destroy() { super.destroy(); // Just puts "destroy" string in log // Put your code here } /** * The doGet method of the servlet. <br> * * This method is called when a form has its tag value method equals to get. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doPost(request,response); } /** * The doPost method of the servlet. <br> * * This method is called when a form has its tag value method equals to post. * * @param request the request send by the client to the server * @param response the response send by the server to the client * @throws ServletException if an error occurred * @throws IOException if an error occurred */ public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setCharacterEncoding("utf-8"); Users u = new Users(); String username,mypassword,gender,email,introduce,isAccept; Date birthday; String[] favorites; SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd"); try { username = request.getParameter("username"); mypassword = request.getParameter("mypassword"); gender = request.getParameter("gender"); email = request.getParameter("email"); introduce = request.getParameter("introduce"); birthday = sdf.parse(request.getParameter("birthday")); if(request.getParameterValues("isAccpet")!=null) { isAccept = request.getParameter("isAccept"); } else { isAccept = "false"; } //用来获取多个复选按钮的值 favorites = request.getParameterValues("favorite"); u.setUsername(username); u.setMypassword(mypassword); u.setGender(gender); u.setEmail(email); u.setFavorites(favorites); u.setIntroduce(introduce); if(isAccept.equals("true")) { u.setFlag(true); } else { u.setFlag(false); } u.setBirthday(birthday); //把注册成功的用户对象保存在session中 request.getSession().setAttribute("regUser", u); //跳转到注册成功页面 request.getRequestDispatcher("../userinfo.jsp").forward(request,response); } catch(Exception ex) { ex.printStackTrace(); } } /** * Initialization of the servlet. <br> * * @throws ServletException if an error occurs */ public void init() throws ServletException { // Put your code here }}
之后就是在userinfo.jsp中来获取信息。使用javaBean,javaBean使用jsp的useBean来获取,指定范围scope是session,id是regUser,还要指明是哪个类,class为entity.Users。<jsp:useBean id="regUser" class="entity.Users" scope="session"/>
。
然后以usernam为例显示用户名,<jsp:getProperty name="regUser" property="username"/>
,name表示是哪个javaBean。
爱好是一个数组,需要遍历,这里代码如下
<% String[] favorites = regUser.getFavorites(); for(String f:favorites) { %> <%=f%> <% } %>
然后是出生日期这一项也要进行转换,提前要把java.text.*导入进来。然后就可以使用SimpleDateFormat,代码如下
<% SimpleDateFormat sdf = new SimpleDateFormat("yyyy年MM月dd日"); String date = sdf.format(regUser.getBirthday()); %> <%=date%>
如此,便完成了工作
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