Thank you,Maxim Dounin.
I also think that the problem is outside of nginx.But I'm confused why IP-1 and IP-2 work,IP-3 don't.
On my computer,IP-1:8080,IP-2:8080,IP-3:8080 and IP-4:8080 are LISTENED by tomcat application server.
I can access my tomcat by the whole IP address.It looks like a contradiction that I can access tomcat via IP-3:8080,
and I can not access nginx via IP-3:80.It's very terrible!