setcharacterencodingfilter.java

这是一个网上书站的例子

package com.servlet.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.HttpServletResponse;
public class SetCharacterEncodingFilter implements Filter {
	private FilterConfig filterConfig;

	public void destroy() {
		// TODO Auto-generated method stub
		
	}

	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		// TODO Auto-generated method stub
		
		try{
			   request.setCharacterEncoding("GB2312");
			   HttpServletResponse res = (HttpServletResponse)response;
			   res.setHeader("Pragma", "No-cache");
			   res.setHeader("Cache-Control", "no-cache");
			   res.setHeader("Pragram", "no-cache");
			   chain.doFilter(request, response);
			   
			  }catch(ServletException e)
			  {
			   filterConfig.getServletContext().log(e.getMessage());
			  }catch(IOException e)
			  {
			   filterConfig.getServletContext().log(e.getMessage());
			  }

		
	
		
	}

	public void init(FilterConfig arg0) throws ServletException {
		// TODO Auto-generated method stub
		filterConfig=arg0;
		
	}

	/**
	 * Constructor of the object.
	 */
	
}