JavaWeb表单数据的获取方式

时间：2022-04-11 05:41:10
表单页面

<%@ page language="java" import="java.util.*" pageEncoding="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 'index.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">

	-->

  </head>

  <body>

  <center>

   <form action="<%=request.getContextPath() %>/Aservlet"method="post">

   姓名<input type="text" name="name" ><br>

   性别：<input type="radio"  name="sex" value="男">男

	<input type="radio"  name="sex" value="女">女   <br>

   学历：<select name="education">

<option value="doctor">博士</option>

<option value="master">硕士</option>

<option value="bachelor">本科</option>

<option value="junior ">大专</option>

</select><br>

   爱好：

<input type="checkbox" name="habby" value="read">读书

<input type="checkbox" name="habby" value="travel">旅行

<input type="checkbox" name="habby" value="run">跑步

<input type="checkbox" name="habby" value="sing">唱歌<br>

 工作经历：

<textarea  name="works" rows="10" cols="30">

</textarea><br>

<input type="submit" value="提交" style="width: 150px;height: 30px;">

   </form>

   </center>

  </body>

</html>


Servlet


第一种方式实现（普通式）




/*第一种方式*/

        writer.println("<hr>"+"<h2>第一种方式实现（普通式）</h2>");

        String education2 = "";

        String naemString = request.getParameter("name");

        String sex = request.getParameter("sex");

        String education = request.getParameter("education");

        String[] habbys = request.getParameterValues("habby");

        String works = request.getParameter("works");

        switch (education) {

        case "doctor":

            education2 = "博士";

            break;

        case "master":

            education2 = "硕士";

            break;

        case "bachelor":

            education2 = "本科";

            break;

        case "junior":

            education2 = "大专";

            break;

        default:

            break;

        }

        writer.println("姓名:" + naemString + "<br>");

        writer.print("<br>");

        writer.println("性别:" + sex + "<br>");

        writer.print("<br>");

        writer.println("学历:" + education2 + "<br>");

        writer.print("<br>");

        writer.print("爱好:" + "<br>");

        for (String habby : habbys) {

            writer.println(habby);

        }

        writer.print("<br>");

        writer.print("<br>");

        writer.println("工作经历:" + works + "<br>");




第二种方式实现（通过EntrySet遍历Map集合）




/*第二种方式*/

        writer.println("<hr>"+"<h2>第二种方式实现（通过EntrySet遍历Map集合）</h2>");

        Map<String, String[]> parameterMap = request.getParameterMap();

        for (Entry<String, String[]> entry : parameterMap.entrySet()) {

               if (entry.getValue().length>1) {

                   writer.print(entry.getKey()+":  "+"<br>");

                for (String string : entry.getValue()) {

                     writer.print(string+"  "+"<br>");

                }

            }else {

                writer.print(entry.getKey()+":"+entry.getValue()[0]+"  "+"<br>");

            }

              }
        




第三种方式实现（通过JavaBean的内省机制）




        /*第三种方式实现*/

        writer.println("<hr>"+"<h2>第三种方式实现（通过JavaBean的内省机制）</h2>");

        Map<String, String[]> parameterMap2 = request.getParameterMap();

        UserBean userBean = new UserBean();

        try {

            BeanUtils.populate(userBean, parameterMap2);

        } catch (IllegalAccessException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        } catch (InvocationTargetException e) {

            // TODO Auto-generated catch block

            e.printStackTrace();

        }

         writer.print("姓名"+"  "+userBean.getName()+"<br>");

         writer.print("性别"+"  "+userBean.getSex()+"<br>");

         writer.print("学历"+"  "+userBean.getEducation()+"<br>");

         if (userBean.getHabby().length>1) {

             writer.print("爱好"+"<br>");

            for (String string : userBean.getHabby()) {

                writer.print(string+"、");

            }

        }

         writer.print("<br>");

         writer.print("工作经历");

         writer.print("<br>");

         writer.print(userBean.getWorks());

         writer.print("<hr>");

         writer.print(" <a href='http://www.cnblogs.com/heerpeng/'>更多方式</a>");

    }






　　
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