WASHINGTON — A Chinese businessman in Canada hacked into Boeing’s computers and stole information about United States military aircraft and weapons, the Justice Department said on Friday, describing a corporate espionage case that is unusual for the huge amount of data involved.

The businessman, Su Bin, spent years taking data from Boeing, the Federal Bureau of Investigation said in court documents, and working with two unidentified contacts in China sought to sell the information to companies there.

There is no indication that the Chinese government orchestrated the attacks, or that anyone breached classified systems or stole classified information. But the assault on one of the nation’s most sophisticated military contractors is a reminder that even seemingly safe computer systems are vulnerable.

In March, Chinese hackers broke into computers that stored the personal information of all United States government employees. In May, the Justice Department accused five Chinese officials with hacking into Westinghouse Electric, United States Steel and other companies.