Usually it is a simple as adding apply plugin: "eclipse" in your build.gradle and running
cd myProject/
gradle eclipse
and then refreshing your Eclipse project.
Occasionally you’ll need to adjust build.gradle to generate Eclipse settings in some very specific way.
There is gradle support for Eclipse if you are using STS, but I’m not sure how good it is.
The only IDE I know that has decent native support for gradle is IntelliJ IDEA. It can do full import of gradle projects from GUI. There is a free Community Edition that you can try.