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        <td WIDTH="50%" bordercolor="#FFFFFF" CLASS="t1" bgcolor="#F0F0F0" align="center" nowrap>Servlet chaining</td>
        <p></p>
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      <tr>        <td WIDTH="100%" bordercolor="#FFFFFF" CLASS="t" bgcolor="#F0F0F0" colspan="2">
        <BR><FONT color=#000080>在servlet 
                  chaining 
                  情况下，多个servlet由一个客户HTTP请求调用，每个servlet完成输出HTML的一部分，每个servlet都受到原始的HTTP请求作为输入，并且每个servlet独立的产生它自己的servlet.，与Filtering不同的是，在这种情况下，每个servlet的输入和输出显得更独立了一些。</FONT></FONT><BR><IMG 
                  border=0 height=158 src="s04.jpg" tppabs="http://www.chinajavaworld.com/doc/servlet-jsp/images/s04.jpg" 
                  width=357><BR><FONT color=#000080 size=2>&nbsp;&nbsp;&nbsp; 
                  WebSphere 产品提供了一个 ChainerServlet(in 
                  com.ibm.websphere.servlet.filter)，通过一个servlet别名调用它，指定一个原始的请求和多个目标servlet作为初始参数：</FONT>
                  <P></P>
                  <P align=left 
                  style="LINE-HEIGHT: 150%; MARGIN-BOTTOM: 5px; MARGIN-TOP: 5px"><FONT 
                  color=#000080 size=2>Parameter name: 
                  chainer.pathlist<BR>Parameter value: /chainFirst 
                  /chainSecond<BR><BR>&nbsp;&nbsp; 
                  每个servlet在这个别名里都被调用，输出的HTML由所有的servlet输出组成。<BR><BR>&nbsp;&nbsp; 
                  下面的代码显示了如何调用两个servlet并且输出一个response，注意，第二个servlet必需延续第一个servlet的输出。如第一个servlet输出一个XML数据段，由第二个servlet为它加上适当的格式或表格，并返回客户端浏览器。<BR></FONT><BR><FONT 
                  color=#000080 size=2>import java.io.*;<BR>import 
                  javax.servlet.*;<BR>import javax.servlet.http.*;<BR>public 
                  class <B>ChainerFirs t</B> extends HttpServlet 
                  {<BR>　　　　　protected void service(HttpServletRequest req, 
                  HttpServletResponse res)<BR>　　　　　　　　　throws ServletException, 
                  IOException {　　<BR>　　res.setContentT 
                  pe("text/html");<BR>　　PrintWriter out = 
                  res.getWriter();<BR>　　out.println("&lt;HTML&gt;&lt;TITLE&gt;ChainerFirst&lt;/TITLE&gt;&lt;BODY&gt;");<BR>　　out.println("&lt;H2&gt;Servlet 
                  API Example - 
                  ChainerFirst&lt;/H2&gt;&lt;HR&gt;");<BR>　　out.println("&lt;H4&gt;&lt;font 
                  color=\"Red\"&gt;This part of the output produced b<BR>　　the 
                  first servlet..&lt;/font&gt;&lt;/H4&gt;");<BR>}<BR></FONT></P>
                  <P 
                  style="LINE-HEIGHT: 150%; MARGIN-BOTTOM: 5px; MARGIN-TOP: 5px"><FONT 
                  color=#000080 size=2>import java.io.*;<BR>import 
                  javax.servlet.*;<BR>import javax.servlet.http.*;</FONT></P>
                  <P 
                  style="LINE-HEIGHT: 150%; MARGIN-BOTTOM: 5px; MARGIN-TOP: 5px"><FONT 
                  color=#000080 size=2>public class <B>ChainerSecond</B> extends 
                  HttpServlet {<BR>protected void service(HttpServletRequest 
                  req, HttpServletResponse res)<BR>　　throws ServletException, 
                  IOException {<BR>　　res.setContentT pe(req.getContentT 
                  pe());<BR>　　PrintWriter out = res.getWriter();<BR>　　//Need 
                  this to read through the output of the last 
                  servlet:<BR>　　BufferedReader in = req.getReader();<BR>　　String 
                  line;<BR>　　while((line = in.readLine()) != 
                  null)<BR>　　　　out.println(line);<BR>　　　　out.println("&lt;H4&gt;&lt;font 
                  color=\"Green\"&gt;This part of the output 
                  produced<BR>&nbsp;&nbsp;&nbsp; by the second 
                  servlet..&lt;/H4&gt;");<BR>&nbsp;&nbsp;&nbsp; 
                  out.println("&lt;/BODY&gt;&lt;/HTML&gt;");<BR>&nbsp;&nbsp;&nbsp; 
                  out.close();<BR>}</FONT></FONT></P>
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