package com.cn.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.HttpServletResponse;

/**
 * Servlet Filter implementation class EncodingFilter
 */
public class EncodingFilter implements Filter {

    /**
     * Default constructor. 
     */
    public EncodingFilter() {
        // TODO Auto-generated constructor stub
    }

	/**
	 * @see Filter#destroy()
	 */
	public void destroy() {
		// TODO Auto-generated method stub
	}

	/**
	 * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain)
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
		
		//转换类型
		HttpServletRequest req=(HttpServletRequest) request; 
		HttpServletResponse res=(HttpServletResponse) response;  
		
		String uri = req.getRequestURI();
		
		if(uri.contains(".css") || uri.contains(".js") || uri.contains(".png")|| uri.contains(".jpg")){
			//如果发现是css或者js文件，直接放行
			chain.doFilter(request, response);
		} else {
			request.setCharacterEncoding("utf-8");
			response.setCharacterEncoding("utf-8");
			response.setContentType("text/html;charset=utf-8"); 
			chain.doFilter(request, response);
		}
		
		
	}

	/**
	 * @see Filter#init(FilterConfig)
	 */
	public void init(FilterConfig fConfig) throws ServletException {
		// TODO Auto-generated method stub
	}

}
