UserAgent: obtains information about the user's browser and computer through a browser.

Description: The Chinese name of the User Agent is the User Agent (UA). It is a special string header, the server can identify the operating system and version, CPU type, browser and version, browser rendering engine, browser language, and browser plug-in used by the customer. Some websites often send different pages to different operating systems and browsers by judging the UA. Therefore, some pages may not be displayed normally in a browser, however, you can bypass detection by disguising UA. The standard format of UA string in www.2cto.com is: browser identifier (operating system identifier; encryption level identifier; browser LANGUAGE) rendering Engine logo version information browser logo because many websites ignore the two-digit version number during UA detection, it may cause the browser and later versions to receive bad pages, therefore, in Versions later than 10 of the browser, the browser identifier is fixed as the browser, and real version information is added at the end of the UA string. JAVA usage: [java] UserAgent userAgent = UserAgent. parseUserAgentString (request. getHeader ("User-Agent"); Browser browser = userAgent. getBrowser (); OperatingSystem OS = userAgent. getOperatingSystem (); you can obtain browsers of almost all systems, including mobile phones and tablets. This jar file is only 26KB in size and is very useful. If you want to learn more about advanced enum enumeration, you may wish to look at the source code. Some code: