Java - Input library of "apache.commons.net" to IDE Eclipse.

1-
由下面連結下載 "commons-net-3.3-bin.zip".
http://commons.apache.org/proper/commons-net/download_net.cgi

2-
解壓縮 commons-net-3.3-bin.zip

3-
Execute Eclipse --> create a new java project

4-
Left click on project --> Build Path --> Configure Build Path...
On Libraries tab --> Add External JARs...
Browse a file "commons-net-3.3.jar" where you put on.

5-
A Library "commons-net-3.3.jar" should listed on left side Project Explorer.