ajax重写方法搭配后台filter返回status实现ajax请求跳转登录页面

package com.demo.filter; import com.data.SessionUser; import javax.servlet.*; import javax.servlet.annotation.WebFilter; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException; /** * @author jhirror * @version basic 1.0 2017-01-24 * @create 2018-01-24 17:03 * @desc 权限filter demo **/ //也可以在web.xml中配置 @WebFilter("*") public class AuthenticationFilter implements Filter { /** * Default constructor. */ public AuthenticationFilter() { // TODO Auto-generated constructor stub } /** * @see Filter#destroy() */ public void destroy() { // TODO Auto-generated method stub } /** * @see Filter#doFilter(ServletRequest, ServletResponse, FilterChain) */ public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { boolean pass = false; if(request instanceof HttpServletRequest) { HttpServletRequest httpRequest = (HttpServletRequest) request; httpRequest.setCharacterEncoding("UTF-8"); String contextPath = httpRequest.getContextPath(); String url = httpRequest.getRequestURI(); String action = httpRequest.getParameter("action"); SessionUser user = SessionUser.getFromSession(httpRequest.getSession()); if(user == null) { if(url.equals(contextPath + "/index.html") || url.startsWith(contextPath + "/index.jsp") || url.startsWith(contextPath + "/com/public/") || url.startsWith(contextPath + "/admin/public/") || url.startsWith(contextPath + "/administrator/public/") ) { pass = true; } else if(url.equals(contextPath + "/data")) { if(action != null && action.startsWith("pub.")) { pass = true; } } } else { pass = true; } // pass the request along the filter chain if(pass) { if(url.endsWith(".html") || url.endsWith(".js") || url.endsWith(".css")) { response.setCharacterEncoding("UTF-8"); } chain.doFilter(request, response); } else { HttpServletResponse httpResponse = (HttpServletResponse) response; if(url.equals(contextPath + "/data")) { httpResponse.sendError(HttpServletResponse.SC_UNAUTHORIZED); //httpResponse.sendRedirect(contextPath + "/index.jsp"); } else { httpResponse.sendRedirect(contextPath + "/index.jsp"); } } } } /** * @see Filter#init(FilterConfig) */ public void init(FilterConfig fConfig) throws ServletException { } }