半翻译半整理的一点struts的东东，很浅显的，欢迎指正(三）

答案：4．    RequestProcessor：
有关的ActionServlet的实际处理都是在RequestProcessor类中完成的。我们也可以创建我们自己的RequestProcessor类，这需要继承RequestProcessor类。并且要有一个缺省的空的构造器。在这个自定义的RequestProcessor类中重写相关的方法，一般都是重写processXXX()方法。
◆    扩展RequestProcessor类
扩展Processor类按下面的步骤完成：
① 创建一个继承于org.apache.struts.action.RequestProcessor的类
② 添加一个缺省的空的构造器
③ 实现想要重写的方法
例子：
package wiley;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpServlet;
import javax.servlet.ServletException;
import javax.servlet.http.Cookie;
import java.io.IOException;
import java.util.Enumeration;
import org.apache.struts.action.RequestProcessor;
public class WileyRequestProcessor extends RequestProcessor {
public WileyRequestProcessor() {
}
public boolean processPreprocess(HttpServletRequest request, HttpServletResponse response) {
    log("----------processPreprocess Logging--------------");
    log("Request URI = " + request.getRequestURI());
log("Context Path = " + request.getContextPath());
Cookie cookies[] = request.getCookies();
if (cookies != null) {
    for (int i = 0; i < cookies.length; i++) {
     log("Cookie = " + cookies[i].getName() + " = " +
         cookies[i].getValue());
    }
}
Enumeration headerNames = request.getHeaderNames();
while (headerNames.hasMoreElements()) {
String headerName =(String) headerNames.nextElement();
Enumeration headerValues =request.getHeaders(headerName);
while (headerValues.hasMoreElements()) {
String headerValue =(String) headerValues.nextElement();
log("Header = " + headerName + " = " + headerValue);
}
}
log("Locale = " + request.getLocale());
log("Method = " + request.getMethod());
log("Path Info = " + request.getPathInfo());
log("Protocol = " + request.getProtocol());
log("Remote Address = " + request.getRemoteAddr());
log("Remote Host = " + request.getRemoteHost());
log("Remote User = " + request.getRemoteUser());
log("Requested Session Id = " + request.getRequestedSessionId());
log("Scheme = " + request.getScheme());
log("Server Name = " + request.getServerName());
log("Server Port = " + request.getServerPort());
log("Servlet Path = " + request.getServletPath());
log("Secure = " + request.isSecure());
log("-------------------------------------------------");
return true;
}
} 
◆    配置RequestProcessor：
在struts-config.xml文件中配置<controller/>元素。如下：
<controller processorClass=”wiley.WileyRequestProcessor” />
详细配置信息见”struts-config.xml配置文件讲解”。

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