package myitem.renshu;import javax.servlet.*;import javax.servlet.http.*;import java.io.*;import java.util.*;public class EncodingFilter extends HttpServlet implements Filter{    private FilterConfig filterConfig;    private String encoding = null;    protected boolean ignore = true;    public void init(FilterConfig filterConfig) throws ServletException{        this.filterConfig = filterConfig;        this.encoding = filterConfig.getInitParameter("encoding");        String value = filterConfig.getInitParameter("ignore");        if (value == null){            this.ignore = true;        } else if (value.equalsIgnoreCase("true")) {            this.ignore = true;        } else if (value.equalsIgnoreCase("yes")) {            this.ignore = true;        } else {            this.ignore = false;        }    }    //Process the request/response pair    public void doFilter(ServletRequest request,ServletResponse response,                         FilterChain filterChain){        try{            if (ignore || (request.getCharacterEncoding() == null)) {                 String encoding = selectEncoding(request);                 if (encoding != null)                     request.setCharacterEncoding(encoding);             }            filterChain.doFilter(request,response);        } catch(Exception sx){            sx.getMessage();        }    }    private String selectEncoding(ServletRequest request) {        return (this.encoding);    }    //Clean up resources    public void destroy(){        encoding = null;        filterConfig = null;    }}