springmvc 登录鉴权过滤器_springmvc 鉴权

package com.common.filter;
 
import java.io.IOException;
 
import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.springframework.http.HttpStatus;
import org.springframework.web.filter.OncePerRequestFilter;
 
import com.common.util.SessionKeyContent;
 
/**
 * 登录过滤器
 * <功能详细描述>
 * 
 * @author  chenlujun
 * @version  [版本号, 2014年10月11日]
 * @see  [相关类/方法]
 * @since  [产品/模块版本]
 */
public class SessionFilter extends OncePerRequestFilter
{
    
    /** 登录验证过滤器 */
    
    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
        throws ServletException, IOException
    {
        // 不过滤的uri
        String[] notFilter =
            new String[] {"/images", "/js", "/css", "/login/tologin", "/login/mainframe", "/user/exist",
                "/user/checkPassword", "/signcode"};
        
        // 请求的uri
        String uri = request.getRequestURI();
        // 是否过滤
        boolean doFilter = true;
        for (String s : notFilter)
        {
            if (uri.indexOf(s) != -1)
            {
                // 如果uri中包含不过滤的uri，则不进行过滤
                doFilter = false;
                break;
            }
        }
        
        if (doFilter)
        {
            // 执行过滤
            // 从session中获取登录者实体
            Object obj = request.getSession().getAttribute(SessionKeyContent.SESSION_KEY_OBJ_USER_BEAN);
            if (null == obj)
            {
                boolean isAjaxRequest = isAjaxRequest(request);
                if (isAjaxRequest)
                {
                    response.setCharacterEncoding("UTF-8");
                    response.sendError(HttpStatus.UNAUTHORIZED.value(), "您已经太长时间没有操作,请刷新页面");
                    return ;
                }
                response.sendRedirect("../login/tologin");
                return;
            }
            else
            {
                // 如果session中存在登录者实体，则继续
                filterChain.doFilter(request, response);
            }
        }
        else
        {
            // 如果不执行过滤，则继续
            filterChain.doFilter(request, response);
        }
    }
    
    /** 判断是否为Ajax请求 
     * <功能详细描述>
     * @param request
     * @return 是true, 否false 
     * @see [类、类#方法、类#成员]
     */
    public static boolean isAjaxRequest(HttpServletRequest request)
    {
        String header = request.getHeader("X-Requested-With"); 
        if (header != null && "XMLHttpRequest".equals(header)) 
            return true; 
        else 
            return false;  
    }
    
}

web.xml中配置

<filter>  
        <filter-name>sessionFilter</filter-name>  
        <filter-class>com.common.filter.SessionFilter</filter-class>  
    </filter>  
    <filter-mapping>  
        <filter-name>sessionFilter</filter-name>  
        <url-pattern>/*</url-pattern>  
    </filter-mapping>