logincheckfilter.java

办公自动化项目

package com.t60.oa.common.util;
import javax.servlet.*;
import javax.servlet.http.*;
import java.io.*;
import org.apache.log4j.Logger;

public class LoginCheckFilter
    extends HttpServlet implements Filter{
private static Logger log=Logger.getLogger(LoginCheckFilter.class);
    private FilterConfig filterConfig;
    //Handle the passed-in FilterConfig
    public void init(FilterConfig filterConfig)
        throws ServletException
    {
        this.filterConfig = filterConfig;
    }

    //Process the request/response pair
    public void doFilter(ServletRequest request, ServletResponse response
                         , FilterChain filterChain)
    {
        try
        {
            //进行请求和响应的类型转换
            HttpServletRequest httpRequest = (HttpServletRequest) request;
            HttpServletResponse httpResponse = (HttpServletResponse) response;

            boolean isValid = true;
            String uriStr = httpRequest.getRequestURI().toUpperCase();

            log.debug("过滤路径：--》"+uriStr);
            if (uriStr.indexOf("LOGIN.JSP") == -1 &&
                uriStr.indexOf("LOGINACTION.DO") == -1 &&
                httpRequest.getSession().getAttribute("emp") == null)
            {
                isValid = false;
            }
            if (isValid)
            {
                filterChain.doFilter(request, response);
            } else
            {
                httpResponse.sendRedirect("/myweb/overtime.jsp");
            }
        } catch (ServletException sx)
        {
            filterConfig.getServletContext().log(sx.getMessage());
        } catch (IOException iox)
        {
            filterConfig.getServletContext().log(iox.getMessage());
        }
    }

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