mainfilter.java

大象购物管理程序

package com.comm;

import java.io.*;

import javax.servlet.*;
import javax.servlet.http.*;

public class MainFilter extends HttpServlet implements Filter {
    private FilterConfig filterConfig;
    public void init(FilterConfig filterConfig) throws ServletException {
        this.filterConfig = filterConfig;
    }

    public void doFilter(ServletRequest request, ServletResponse response,
                         FilterChain filterChain) {
        try {
            request.setCharacterEncoding("UTF-8");

            String uri = ((HttpServletRequest) request).getRequestURI();
            if (uri.indexOf(".html") > -1) {
                //处理uri。URI的一般模式为：xxx,do,paraName0,paraValue0&paraName1,paraValue1&paraName2,paraValue2&ext,.html
                uri = uri.replaceFirst("_", ".");
                uri = uri.replaceFirst("_", "?");
                uri = uri.replaceAll("__", "&");
                uri = uri.replaceAll("_", "=");
                ((HttpServletRequest) request).getRequestDispatcher(uri).
                        forward(request, response);
                return;
            }
            filterChain.doFilter(request, response);
        } catch (ServletException sx) {
            filterConfig.getServletContext().log(sx.getMessage());
        } catch (IOException iox) {
            filterConfig.getServletContext().log(iox.getMessage());
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }


    //Clean up resources
    public void destroy() {
    }
}