登陆过滤

登陆过滤

实现用户未登陆就返回到登陆页面，用户需要在登陆的时候设置session。

package com.thunisoft.yhan.filters;

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;
import javax.servlet.http.HttpSession;

public class LoginFilter implements Filter{

    @Override
    public void destroy() {
        // TODO Auto-generated method stub

    }

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
            throws IOException, ServletException {
        // TODO Auto-generated method stub
        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        HttpServletRequest req=(HttpServletRequest) request;
        String uri=req.getRequestURI();     
        if(uri.endsWith("register.jsp")||uri.endsWith("register")
            ||uri.endsWith("login.jsp")||uri.endsWith("login")
            ||uri.endsWith("index.jsp")){
            System.out.println(uri+" 未过滤");
        }else{
            HttpSession session=req.getSession();
            if(session.getAttribute("user")==null){
                HttpServletResponse res=(HttpServletResponse) response;
                res.sendRedirect(req.getContextPath()+"/user/login.jsp");
                System.out.println(uri+"过滤");
                return;
            }
        }
        chain.doFilter(request, response);

    }

    @Override
    public void init(FilterConfig arg0) throws ServletException {
        // TODO Auto-generated method stub

    }

}

web.xml中添加：

 <filter>
        <filter-name>loginFilter</filter-name>
        <filter-class>com.thunisoft.yhan.filters.LoginFilter</filter-class>
    </filter>
    <filter-mapping>
        <filter-name>loginFilter</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

<script type="text/javascript"> $(function () { $('pre.prettyprint code').each(function () { var lines = $(this).text().split('\n').length; var $numbering = $('<ul/>').addClass('pre-numbering').hide(); $(this).addClass('has-numbering').parent().append($numbering); for (i = 1; i <= lines; i++) { $numbering.append($('<li/>').text(i)); }; $numbering.fadeIn(1700); }); }); </script>