The first step: the official website to download the corresponding version of a good spring-tool-suite files, the official website: https://spring.io/tools/sts
Step two: unzip the downloaded file:
After extracting, open the sts-3.9.5.RELEASE file, select the following two folders, copy
Step 3: Place the two folders copied to the eclipse folder dropins folder:
After you copy, you can restart the eclipse, after the restart, you will find the eclipse already installed spring-related plug-ins: