The day before yesterday bought a student on ali cloud cloud server, and then thinking of written before deploy javaweb project, is also in accordance with the online tutorial to do, the war file upload pagoda tomcat webapps, modify the server port is 80 in the XML file, localhost for their IP addresses, add the context, also don't know why is javaweb project is able to show, then change to 8080, found that I put in the inside of the usr a picture can be via IP: 8080 + address see images, I think it is proved that the context of the tag I didn't write wrong, the same method but not the project is very strange, stranger under port 80 even before I upload the image I can't see, show 404, online 80 port is occupied, but I'll take 80 port is not sigh, I also add the port 80 inbound firewall rules, I really don't know why this has been can't use port 80,,,,,,,,, for me one day,,,, still hope you great god guidance,,,