登录过滤类loginFilter------------------------------------------
package spell;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.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.servlet.http.HttpSession;
public class loginFilter extends HttpServlet implements Filter { 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 { HttpServletRequest req=(HttpServletRequest)request; HttpServletResponse rsp=(HttpServletResponse)response; HttpSession session=req.getSession(true); String userName=(String)session.getAttribute("userName"); if(userName!=null) {//验证通过 filterChain.doFilter(request, response); } else {//验证不通过,取得设置的跳转页面参数 String noLogin=filterConfig.getInitParameter("noLogin"); rsp.sendRedirect(noLogin); } } catch (Exception sx) { filterConfig.getServletContext().log(sx.getMessage()); } } //Clean up resources public void destroy() { } protected void doGet(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {// TODO Auto-generated method stub super.doGet(arg0, arg1); } protected void doPost(HttpServletRequest arg0, HttpServletResponse arg1) throws ServletException, IOException {// TODO Auto-generated method stub super.doPost(arg0, arg1); }}
web.xml配置----------------------------
<filter> <filter-name>loginFilter</filter-name> <filter-class>spell.loginFilter</filter-class> <!--loginFilter对应的类名--> <init-param> <param-name>noLogin</param-name> <param-value>../strutsHtml.jsp</param-value> <!--没有登录跳转的页面--> </init-param> </filter>
<filter-mapping> <filter-name>loginFilter</filter-name> <!--选择loginFilter来验证登录--> <url-pattern>/member/*</url-pattern> <!--配置member下的文件要求权限判断--> </filter-mapping>
