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📁 JspServlet教程专栏 对javaservlet讲述的非常详细
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<title>新时代软件教程:操作系统 主页制作 服务器 设计软件 网络技术 编程语言 文字编辑</title>
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    <p align="center"><big><strong>JSP入门教程（2）</strong></big></p>

<div align="right">作者：SUN&nbsp; 汉化：JSPER&nbsp;整理：JSPER</div>
            <P align=center class=MsoNormal style="TEXT-ALIGN: center"><B><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">第二课：用</SPAN><SPAN 
            lang=EN-US style="mso-font-kerning: 0pt">HTML</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">表单</SPAN><SPAN 
            lang=EN-US style="mso-font-kerning: 0pt"><O:P> </O:P></SPAN></B></P>
            <P class=MsoNormal 
            style="TEXT-INDENT: 21pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt"><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">大多数情况下，商业的网站都要有一些表单，比如说输入一下消费者的姓名啦，地址啦，或者敲一个词来用搜索引擎来查一下啦，或者市场人员从来访者处收集一些数据供参考什么的。</SPAN><SPAN 
            lang=EN-US style="mso-font-kerning: 0pt"><O:P> </O:P></SPAN></P>
            <P class=MsoNormal><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">那些表单传回的数据怎么处理的？</SPAN><SPAN 
            lang=EN-US style="mso-font-kerning: 0pt"><O:P> </O:P></SPAN></P>
            <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">来访者通过表单向</SPAN><SPAN 
            lang=EN-US style="mso-font-kerning: 0pt">JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">引擎输入了数据，并保存在了</SPAN><SPAN 
            lang=EN-US style="mso-font-kerning: 0pt">request</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'; mso-font-kerning: 0pt">对象中，那么接下来怎么办？</SPAN></P>
            <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">图</SPAN><SPAN 
            lang=EN-US>2-1</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">向你展示了数据流是如何在服务器和客户之间传递的（至少在</SPAN><SPAN 
            lang=EN-US>SUN</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的</SPAN><SPAN 
            lang=EN-US>JSP reference implementation</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">是这么做的，别的</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引擎工作起来可能会有一点点的不同，其实大同小异，都差不多）</SPAN></P>
            <P align=center class=MsoNormal 
            style="TEXT-ALIGN: center; TEXT-INDENT: 21.75pt"> <IMG height=246 src="images/01002.1.gif" width=333 
            v:shapes="_x0000_i1025"></SPAN></P>
            <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">字儿太小了，可能看不大清吧？俺来解释一下了只好。</SPAN></P>
            <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">首先，</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引擎把存放在</SPAN><SPAN 
            lang=EN-US>request</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对象中的数据发到</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">页面指定的服务器端的组件（</SPAN><SPAN 
            lang=EN-US>JavaBeans</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">组件</SPAN> , servlet,</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或者</SPAN><SPAN 
            lang=EN-US>enterprise bean</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">），组件收到这些个数据以后，有可能再存这些数据到数据库或者其他的地方存放起来，同时，返回一个</SPAN><SPAN 
            lang=EN-US>response</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对象给</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引擎。</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引擎再把</SPAN><SPAN 
            lang=EN-US>response</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对象传给</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">页面，这时的页面包含了定义好的格式和从服务器端得到的数据。这时</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">引擎和</SPAN><SPAN 
            lang=EN-US>Web</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">服务器再发送一个整理好的完整的页面给客户，也就是这们在浏览器上看到的结果。客户和服务器间的通信协议可以用</SPAN><SPAN 
            lang=EN-US>HTTP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，当然也可以用其他的。</SPAN></P>
            <P class=MsoNormal style="TEXT-INDENT: 21.75pt"><SPAN 
            lang=EN-US>Request</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">和</SPAN><SPAN 
            lang=EN-US>Response</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对象在你制作的</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">原代码中起作用。到于</SPAN><SPAN 
            lang=EN-US>request</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">对象到底怎么用，我要在接下来详细的讲给你听。</SPAN></P>
            <P class=MsoNormal><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">如何创建表单</SPAN></P>
            <P class=MsoNormal><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">用</SPAN><SPAN 
            lang=EN-US>HTML</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">定义一些有代表性的表单做成一个</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">文件，然后用</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">标签在表单和服务器端对象（通常都用</SPAN><SPAN 
            lang=EN-US>Bean</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">）传递数据。一般情况下是这么干的：</SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l7 level1 lfo3; tab-stops: list 18.0pt"><SPAN 
            lang=EN-US>1、<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
            </SPAN></SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">写</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">原文件，创建一些</SPAN><SPAN 
            lang=EN-US>HTML</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的表单并命名。</SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l7 level1 lfo3; tab-stops: list 18.0pt"><SPAN 
            lang=EN-US>2、<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
            </SPAN></SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">在</SPAN><SPAN 
            lang=EN-US>Java</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">文件里写</SPAN><SPAN 
            lang=EN-US>Bean</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，定义属性，</SPAN><SPAN 
            lang=EN-US>GET</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">或者</SPAN><SPAN 
            lang=EN-US>SET</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法来配合已经被你指定好名字的表单。</SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l7 level1 lfo3; tab-stops: list 18.0pt"><SPAN 
            lang=EN-US>3、<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
            </SPAN></SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">回到</SPAN><SPAN 
            lang=EN-US>JSP</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">原文件中，增加</SPAN> &lt;jsp:useBean&gt;</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">标签来创建一个或者调用一个现成的</SPAN><SPAN 
            lang=EN-US>Bean</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">。</SPAN></P>
            <P class=MsoNormal 
            style="MARGIN-LEFT: 18pt; TEXT-INDENT: -18pt; mso-list: l7 level1 lfo3; tab-stops: list 18.0pt"><SPAN 
            lang=EN-US>4、<SPAN style="FONT: 7pt 'Times New Roman'">&nbsp; 
            </SPAN></SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">增加</SPAN> &lt;jsp:setProperty&gt;</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">标签设置</SPAN><SPAN 
            lang=EN-US>HTML</SPAN><SPAN
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