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过滤器问题，求救！

摘要: 过滤器问题，求救！

过滤器如下：
package com.sinodata.lovecard.filter;

import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.UnavailableException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;

/**
* Example filter that sets the character encoding to be used in parsing the
* incoming request
*/
public class SetCharacterEncodingFilter
extends HttpServlet
implements Filter {

private FilterConfig filterConfig;
private String targetEncoding = "ASCII";

/**
* Called by the web container to indicate to a filter that it is being placed
* into service.
*
* @param filterConfig FilterConfig
* @throws ServletException
* @todo Implement this javax.servlet.Filter method
*/
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
this.targetEncoding = filterConfig.getInitParameter("encoding");
System.out.println("这是什么编码:"+this.targetEncoding);
}

/**
* The doFilter method of the Filter is called by the container
* each time a request/response pair is passed through the chain due to a
* client request for a resource at the end of the chain.
*
* @param request ServletRequest
* @param response ServletResponse
* @param chain FilterChain
* @throws IOException
* @throws ServletException
* @todo Implement this javax.servlet.Filter method
*/
public void doFilter(ServletRequest srequest, ServletResponse sresponse,
FilterChain chain) throws IOException, ServletException {
try {
HttpServletRequest request = (HttpServletRequest) srequest;
request.setCharacterEncoding(targetEncoding);
chain.doFilter(srequest, sresponse);
}
catch (ServletException sx) {
System.out.println("HOHO");
filterConfig.getServletContext().log(sx.getMessage());
}
catch (IOException iox) {
filterConfig.getServletContext().log(iox.getMessage());
}
}

/**
* Called by the web container to indicate to a filter that it is being taken
* out of service.
*
* @todo Implement this javax.servlet.Filter method
*/
public void destroy() {
filterConfig = null;
targetEncoding = null;
}

}

WEB.XML配置如下：

Set Character Encoding
com.sinodata.lovecard.filter.SetCharacterEncodingFilter


encoding
UTF-8

可是我的过滤器并没有执行起来，为什么呀？

---

缺少了

Set Character Encoding
/*

---