package web.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;
 
public class CharacterEncodingFilter implements Filter {
     
    protected FilterConfig filterConfig = null;
    
    protected String encoding = "";
    
    public void destroy() {
        filterConfig = null;
        encoding = null;
    }
 
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
            FilterChain filterChain) throws IOException, ServletException {
        if(encoding != null && !"".equals(encoding))
            servletRequest.setCharacterEncoding(encoding);
        filterChain.doFilter(servletRequest, servletResponse);
    }
 
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
        this.encoding = filterConfig.getInitParameter("encoding");
    }
 
}