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<title>csdn_Servlet 协作：Filtering 和 Chaining</title>
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<td WIDTH="50%" bordercolor="#FFFFFF" CLASS="t1" bgcolor="#F0F0F0" align="center" nowrap>Servlet 协作：Filtering 和 Chaining</td>
<p> <td WIDTH="50%" bordercolor="#FFFFFF" CLASS="t1" bgcolor="#F0F0F0" align="center" nowrap>作者：jeson</td></p>
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<BR><FONT color=#ff0000 size=2>Servlet 协作：Filtering
和 Chaining</FONT></B><FONT color=#000080
size=2><BR><BR> Filtering 技术用于多个servlet
共同产生一个响应返回给客户端，下面介绍第一个servlet MIME filtering
的例子，该例子演示了一个在WebSphere值得经常使用的技术，唯一一点必需注意的是，它必须要IBM WebSphere
支持。通常，MIME类型为TEXT/HTML时，Web Application
Server将直接把输出信息回送到客户端浏览器，但是，当使用用户自定义的MIME类型时，Web Application
Server将激活指定的处理该信息的servlet，即第一个servlet的输出即为第二个servlet的输入。<BR><BR>
在本例中，第一个servlet定义一个用户MIME类型并输出信息，由WebSpere自动处理该用户MIME类型，即激活处理该MIME类型的第二个servlet（配置WebSphere的方法将在WebSphere栏目中介绍），并由该servlet输出到客户端。在做复杂的数据交换时，如你要在分别处理XML和HTML得两个servlet之间交换数据时,该方法是非常有效的。表示图及代码如下：</FONT><BR><IMG
border=0 height=116
src="servle2.jpg" tppabs="http://www.chinajavaworld.com/doc/servlet-jsp/images/servle2.jpg"
width=351><BR><FONT color=#000080 size=2>import
java.io.*;<BR>import javax.servlet.*;<BR>import
javax.servlet.http.*;<BR><BR>public class <B>FilterFirst</B>
extends HttpServlet {<BR> protected void
service(HttpServletRequest req, HttpServletResponse
res)<BR> throws
ServletException, IOException {<BR>
res.setContentT pe("text/Deb");
//用户定义的mime类型<BR> PrintWriter out =
res.getWriter();<BR> out.println("Servlet API
Example - FilterFirst");<BR> out.println("Output
from the FilterFirst servlet");<BR>
out.close();<BR>}<BR><BR>import java.io.*;<BR>import
javax.servlet.*;<BR>import javax.servlet.http.*;<BR><BR>public
class <B>FilterSecond</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> //reading the output
from the first servlet..<BR> BufferedReader in =
req.getReader();<BR> String line;<BR>
out.println("");<BR> while((line = in.readLine())
!= null)<BR> out.println(line);<BR>
out.println("<FONT color=#00ee00>This part of the output
produced by the second filter servlet..</FONT>");
<BR> out.println("");<BR>
out.close();<BR>}<BR></FONT></FONT>
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