When Jets linebacker David Harris walked into the team’s first defensive meeting of the spring, it hit him.

Most of the guys he played with for years were gone. As part of new general manager John Idzik’s housecleaning, he got rid of seven defensive starters from last year’s 6-10 team.

“It was expected when you have a six-win season and a new general manager,” Harris said. “Pretty much they destroyed it to rebuild it.”

Harris took time to speak with reporters at his golf outing yesterday at Green Brook Country Club in Caldwell, N.J., that benefits the Give the Kids Hope foundation. It is the third straight year Harris has held the event, which helps underprivileged children through educational and recreational programs.

Idzik released 2012 defensive starters Sione Po’uha, Bart Scott and Bryan Thomas as part of the salary-cap purge. He then let Mike DeVito, LaRon Landry and Yeremiah Bell leave via free agency. Finally, he shipped Darrelle Revis to the Buccaneers rather than pay him big money.

“It was weird the first day, to be honest,” Harris said. “You’re so used to seeing certain guys in the same room with you. One thing I’ve learned about the NFL is just like the real world, the more you stay around the more your friends start disappearing. It’s no different.”

Harris lost two of his closest friends on the team — Scott and Revis. Harris and Revis were both selected in the 2007 draft and roomed together during training camp in Cortland. Harris said it was tough to take when the team traded Revis to the Buccaneers last month.