package com.kaka.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;

public class CharsetFilter implements Filter{
	
	private FilterConfig config = null;
	//private Logger logger = Logger.getLogger(CharsetFilter.class);
	
	public void destroy() {
	}
	
	/**
	 * 当设置的请求被拦截时，调用doFilter
	 */
	public void doFilter(ServletRequest req, ServletResponse resp,
			FilterChain chain) throws IOException, ServletException {
		
		HttpServletRequest request = (HttpServletRequest)req;
		HttpServletResponse response = (HttpServletResponse)resp;
		
		//获取web.xml中的编码集，设置到request和response中
		request.setCharacterEncoding(config.getInitParameter("charset"));
		response.setCharacterEncoding(config.getInitParameter("charset"));
		response.setContentType(config.getInitParameter("contentType"));
		//将请求转发到目的地
		chain.doFilter(request, response);
	}

	public void init(FilterConfig config) throws ServletException {
		this.config = config;
	}

}