Merge remote-tracking branch 'remotes/origin/master' into hechu1

src/filter/OnlineCheck.java

@@ -2,14 +2,22 @@ package filter;
 
 import javax.servlet.*;
 import javax.servlet.annotation.WebFilter;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
 import java.io.IOException;
 
-@WebFilter(filterName = "OnlineCheck")
+@WebFilter(filterName = "OnlineCheck",urlPatterns = "/home.jsp")
 public class OnlineCheck implements Filter {
     public void destroy() {
     }
 
     public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain) throws ServletException, IOException {
+        HttpServletRequest request = (HttpServletRequest) req;
+        if(request.getSession().getAttribute("user")==null){
+            HttpServletResponse response = (HttpServletResponse) resp;
+            response.sendRedirect("/login.jsp");
+            return;
+        }
         chain.doFilter(req, resp);
     }