Importing GSON into Eclipse.
Downloading GSON.
You will need to download Gson Jar ( “gson-2.6.2.jar” ) from the maven repo. Make sure to keep a note of where you saved it.
Creating a User Library for Gson.
Open Windows >preferences in the Eclipse menu, and navigate to the Java >Build path > User Libraries tab. Click new and enter a new User Library name: like “gson_lib” and hit ok. With “gson_lib” selected press Add External JARs and find the gson-2.6.2.jar you downloaded. Apply and Close.
Adding the User Library to a package.
Right click your package in package explorer > Build path > Add Libraries. Select User libraries and then press next, now just tick “gson_lib” and click finish.
Import it with import com.google.gson.*;
原文出处:https://medium.com/programmers-blockchain/importing-gson-into-eclipse-ec8cf678ad52