解决Filter对用户登录印证产生死循环

解决Filter对用户登录验证产生死循环

要对后台管理文件夹下的所有管理页面进行过滤，阻止未登录的用户访问这些页面，在操作中出现了重定向死循环，经过思考，最终找到了解决办法，现在把代码贴出来。

Filter过滤器类

package dsh.bikegis.filter;import java.io.IOException;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.RequestDispatcher;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 LoginCheckFilter implements Filter {public void init(FilterConfig filterConfig) throws ServletException {}public void doFilter(ServletRequest request, ServletResponse response,FilterChain chain) throws IOException, ServletException {HttpServletRequest req = (HttpServletRequest) request;HttpServletResponse res = (HttpServletResponse) response;HttpSession session = req.getSession(true);// 从session里取的用户名信息String username = (String) session.getAttribute("userName");String   uri   =   ((HttpServletRequest)   request).getRequestURI(); // 判断如果没有取到用户信息,就跳转到登陆页面if (username != null || !("".equals(username))|| uri.endsWith("index.html") ) {chain.doFilter(request, response);} else {// 跳转到登陆页面RequestDispatcher dispatcher = request.getRequestDispatcher("index.html");  dispatcher.forward(request, response);  }}public void destroy() {}}

          <filter-name>yes</filter-name>            <filter-class>dsh.bikegis.filter.LoginCheckFilter</filter-class>        </filter>           <filter-mapping>            <filter-name>yes</filter-name>            <url-pattern>/manage/*</url-pattern>        </filter-mapping>  

?//登錄驗證

public String loginUser(){if(this.us.getUser(user)!=null){ ActionContext.getContext().getSession().put("userName",user.getUsername());  return ActionSupport.SUCCESS;}this.errMesg="密碼或者用戶名錯誤，請重新輸入！";return ActionSupport.ERROR;}

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其中登录验证为 struts2中的Action，前台登录页面访问这个Action，成功的话就把用户名放入session中；在Filter中获得session中存放的字符串，如果不为空，或者是登录页面（此处为index.html）的话则验证成功，就放行，让其具有访问manage目录下的所有文件。否则跳转到index.html

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