package com.green.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.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

public class TomcatFormFilter implements Filter {
	/**
	  * Request.java
	  * 锟斤拷 HttpServletRequestWrapper 锟斤拷锟斤拷)锟斤拷, 锟斤拷影锟斤拷原4锟侥癸拷锟杰诧拷锟斤拷锟结供锟斤拷锟叫碉拷 HttpServletRequest
	  * 锟接匡拷锟叫的癸拷锟斤拷. 锟斤拷锟斤拷锟酵骋伙拷亩锟� Tomcat 默锟斤拷锟斤拷锟斤拷锟铰碉拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷薪锟斤拷锟街伙拷锟揭拷锟斤拷碌锟� Request 锟斤拷锟斤拷锟芥换页锟斤拷锟叫碉拷
	  * request 锟斤拷锟襟即匡拷.
	  */

	class Request extends HttpServletRequestWrapper
	{

	    public Request(HttpServletRequest request) {
	    	super(request);
	    }

		/**
		 * 转锟斤拷锟缴�?锟斤拷取锟斤拷锟斤拷莸锟斤拷锟斤拷锟�.
		 * 锟斤拷 ISO 锟街凤拷转锟斤拷 GBK.
		 */
		public String toChi(String input) {
		    try {
		      byte[] bytes = input.getBytes("ISO-8859-1");
		      return new String(bytes, "UTF-8");
		    }
		    catch (Exception ex) {
		    }
		    return null;
		}

	    /**
	     * Return the HttpServletRequest holded by this object.
	     */
	    private HttpServletRequest getHttpServletRequest()
	    {
	        return (HttpServletRequest)super.getRequest();
	    }

		/**
		 * 锟斤拷取锟斤拷锟斤拷 -- 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷.
		 */
	    public String getParameter(String name)
	    {
	    	return toChi(getHttpServletRequest().getParameter(name));
	    }

		/**
		 * 锟斤拷取锟斤拷锟斤拷锟叫憋拷 - 锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷锟斤拷.
		 */
	    public String[] getParameterValues(String name)
	    {
		      String values[] = getHttpServletRequest().getParameterValues(name);
		      if (values != null) {
		        for (int i = 0; i < values.length; i++) {
		          values[i] = toChi(values[i]);
		        }
		      }
		      return values;
	    }
	}
	public void destroy() {
		
	}

	public void doFilter(ServletRequest request, ServletResponse response,
			FilterChain chain) throws IOException, ServletException {
		HttpServletRequest httpreq = (HttpServletRequest)request;
		if(httpreq.getMethod().equals("POST")) {
			request.setCharacterEncoding("UTF-8");
		} else {
			request = new Request(httpreq);
		}

		chain.doFilter(request, response);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
	}

}