0034.htm

JspServlet教程专栏 对javaservlet讲述的非常详细

            <P class=MsoNormal 
            style="TEXT-INDENT: 21pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt"><SPAN 
            lang=EN-US>If ( request.getParameter("username") != null 
)</SPAN></P>
            <P class=MsoNormal 
            style="TEXT-INDENT: 21pt; mso-char-indent-count: 2.0; mso-char-indent-size: 10.5pt"> {</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>%&gt;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>&lt;%<SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp; </SPAN>@ include 
            file="response.jsp" <SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;</SPAN>%&gt;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>&lt;%<SPAN 
            style="mso-spacerun: yes">&nbsp; </SPAN>}</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>%&gt;</SPAN></P>
            <P class=MsoNormal> &lt;/body&gt;&lt;/html&gt;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><!--[if gte vml 1]><V:SHAPE 
            id=_x0000_i1028 style="HEIGHT: 184.5pt; WIDTH: 249.75pt" alt="" 
            type="#_x0000_t75"><V:IMAGEDATA 
            o:href="file:///C:/Documents%20and%20Settings/Administrator/桌面/tutorials/jspbasics.fm.anc6.gif" 
            src="01002.6.gif"></V:SHAPE><![endif]--><IMG height=246 
            src="images/01002.6.gif" width=333 
            v:shapes="_x0000_i1028"><SPAN style="mso-spacerun: yes">&nbsp; 
            </SPAN></SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">回应文件：</SPAN><SPAN 
            lang=EN-US>response.jsp</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>&lt;table border="0" 
            width="700"&gt;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>&lt;tr&gt;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>&lt;td width="150"&gt; 
            &amp;nbsp; &lt;/td&gt;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>&lt;td 
width="550"&gt;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>&lt;h1&gt;Hello, 
            &lt;jsp:getProperty name="mybean" property="username" 
            /&gt;!</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>&lt;/h1&gt;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>&lt;/td&gt;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>&lt;/tr&gt;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>&lt;/table&gt;</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'">处理数据的</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> (namehandler.java)</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>package hello;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>public class 
            NameHandler</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>{</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>private String 
            username;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>public 
            NameHandler() {</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>username 
            = null;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>}</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>public void 
            setUsername( String name ) {</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>username 
            = name;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>}</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; </SPAN>public String 
            getUsername() {</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>return 
            username;</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US><SPAN 
            style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp; 
            &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</SPAN>}</SPAN></P>
            <P class=MsoNormal><SPAN lang=EN-US>}</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'">建立</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'">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'">一个</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'">的窗分为三个部分：</SPAN> &lt;form&gt;</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">标签，输入方法，提交按钮发数据到服务器。一般的</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'">页面里，是这么写的</SPAN> &lt;form method=get action=someurl&gt;</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">，在其他的页面里的</SPAN><SPAN 
            lang=EN-US>action</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">属性可能是其他特殊的</SPAN><SPAN 
            lang=EN-US>CGI</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">程序或者其他能处理数据的程序，那么在</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'">里边是怎么用的呢，呵，如果你想把数据发到</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'">里的话那么你可以省略</SPAN><SPAN 
            lang=EN-US>action</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">里边的东里了，直接写</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'">标签或者其他特定的</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'">文件了。接下来的那些表单和普通的</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'">差不多了，</SPAN> &lt;input&gt;</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">的方法，然后加一个提交按钮，可能还有一个</SPAN><SPAN 
            lang=EN-US>Reset</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">按钮，对了，别忘了，还得给每一个</SPAN><SPAN 
            lang=EN-US>input</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">表单加一个名字。</SPAN> <BR></SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">这么写：</SPAN> &lt;input type="text" 
            <STRONG>name="username"</STRONG>&gt;</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'">使用</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'">和</SPAN><SPAN 
            lang=EN-US>POST</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法</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>GET</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>POST</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法可以发数据到服务器，在</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'">程序中</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'">和</SPAN><SPAN 
            lang=EN-US>POST</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">方法可以发数据到</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><SPAN 
            lang=EN-US>servlet</SPAN><SPAN 
            style="FONT-FAMILY: 宋体; mso-ascii-font-family: 'Times New Roman'; mso-hansi-font-family: 'Times New Roman'">、或者其他服务器端的组件。</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'">理论上说，</SPAN><SPAN