Java obtains the browser type, operating system type, and mobile phone type through the browser Request Header (User-Agent ).

Java obtains the browser type, operating system type, and mobile phone type through the browser Request Header (User-Agent ).
The Chinese name of the User Agent is the User Agent (UA), which 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.

1. Obtain the User-Agent in the browser Request Header

String ua = request.getHeader("User-Agent")

2. Obtain the browser type and operating system type: (Note that the UserAgent class is in UserAgentUtils. jar and downloaded by yourself)

    UserAgent userAgent = UserAgent.parseUserAgentString(request.getHeader("User-Agent"));             Browser browser = userAgent.getBrowser();             OperatingSystem os = userAgent.getOperatingSystem();  

3. Obtain the mobile phone type:

Solution 1: Regular Expressions

By observing the law, the following expressions are obtained:

;\s?([^;]+?)\s?(Build)?/  

Java code:

Pattern pattern = Pattern. compile (";\\ s? (\ S *? \ S? \ S *?) \ S? (Build )? /"); Matcher matcher = pattern. matcher (userAgent); String model = null; if (matcher. find () {model = matcher. group (1 ). trim (); log. debug ("parse the model through userAgent:" + model );}

The following are some useragents for testing and can be verified directly in EditPlus.

Mozilla/5.0 (Linux; U; Android 4.3; zh-cn; R8007 Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) version/4.0 Mobile Safari/534.30 Mozilla/5.0 (Linux; U; Android 4.3; zh-cn; R8007 Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) version/4.0 Mobile Safari/534.30 V1_AND_SQ_5.0.0_146_YYB_D QQ/5.0.0.2215Mozilla/5.0 (Linux; U; Android 4.3; zh-cn; SM-N9009 Build/JSS15J) AppleWebKit/537.36 (KHTML, like Gecko) version/4.0 MQQBrowser/5.3 Mobile Safari/537.36 Mozilla/5.0 (Linux; Android 4.2.2; zh-cn; SCH-I959 Build/JDQ39) AppleWebKit/535.19 (KHTML, like Gecko) version/1.0 Chrome/18.0.1025.308 Mobile Safari/535.19 Mozilla/5.0 (Linux; U; Android 4.3; zh-CN; SM-N9009 Build/JSS15J) AppleWebKit/533.1 (KHTML, like Gecko) version/4.0 UCBrowser/9.9.2.467 U3/0.8.0 Mobile Safari/533.1 Mozilla/5.0 (Linux; U; Android 4.1.2; zh-CN; Coolpad 5891 Build/JZO54K) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 UCBrowser/9.9.3.478 U3/0.8.0 Mobile Safari/533.1 Mozilla/5.0 (Linux; U; Android 4.1.2; zh-cn; Coolpad 5891 Build/JZO54K) appleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 running QQ/5.0.0.2215Mozilla/5.0 (iPhone; CPU iPhone OS 7_0_4 like Mac OS X) AppleWebKit/537.51.1 (KHTML, like Gecko) Version/7.0 Mobile/11B554a Safari/9537.53 Mozilla/5.0 (iPhone; CPU iPhone OS 7_1_2 like Mac OS X) AppleWebKit/537.51.2 (KHTML, like Gecko) mobile/11D257 QQ/5.0.0.165Mozilla/5.0 (Linux; Android 4.3; zh-cn; SAMSUNG-GT-I9308_TD/1.0 Android/4.3 Release/11.15.2013 Browser/AppleWebKit534.30 Build/JSS15J) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 Mozilla/5.0 (Linux; U; Android 4.1.1; zh-cn; GT-N7100 Build/JRO03C) AppleWebKit/534.30 (KHTML, like Gecko) version/4.0 Mobile Safari/534.30 SogouMSE, SogouMobileBrowser/3.2.3Mozilla/5.0 (Linux; U; Android 4.2.2; zh-cn; SCH-I959 Build/JDQ39) AppleWebKit/534.24 (KHTML, like Gecko) version/4.0 Mobile Safari/534.24 T5/2.0 baidubrowser/5.0.3.10 (Baidu; P1 4.2.2) Mozilla/5.0 (Linux; U; Android 4.2.2; zh-cn; SCH-I959 Build/JDQ39) appleWebKit/534.24 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.24 T5/2.0 Mozilla/5.0 (Linux; Android 4.3; SM-N9009 Build/JSS15J) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.117 Mobile Safari/537.36 OPR/24.0.1565.82529Mozilla/5.0 (Linux; U; Android 4.4.4; zh-CN; Nexus 4 Build/KTU84P) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 UCBrowser/9.9.2.467 U3/0.8.0 Mobile Safari/533.1 Mozilla/5.0 (Linux; U; Android 4.0.4; zh-cn; I C8825D Build appleWebKit/534.24 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.24 T5/2.0 baidubrowser/5.2.3.0 (Baidu; P1 4.0.4) Mozilla/5.0 (Linux; U; Android 4.0.4; zh-cn; C8825D Build/javasweic8825d) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 MQQBrowser/5.3 Mobile Safari/537.36 Mozilla/5.0 (Linux; Android 4.0.4; C8825D Build/javasweic8825d) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.117 Mobile Safari/537.36 Mozilla/5.0 (Linux; U; Android 4.0.4; zh-cn; C8825D Build/javasweic8825d) AppleWebKit/535.19 (KHTML, like Gecko) Version/4.0 LieBaoFast/2.12.0 Mobile Safari/535.19 Opera/9.80 (Android; Opera Mini/7.0.31907/34.2499; U; zh) Presto/2.8.119 Version/11.10 Mozilla/5.0 (Linux; U; Android 4.0.4; zh-cn; HW-_C8825D/C8825DV100R001C92B943SP01; 480*800; CTC/2.0) appleWebKit/534.30 Mobile Safari/534.30 Mozilla/5.0 (Linux; U; Android 4.4.2; zh-CN; SGP521 Build/17.1.2.A.0.314) AppleWebKit/533.1 (KHTML, like Gecko) version/4.0 UCBrowser/9.9.2.467 U3/0.8.0 Mobile Safari/533.1 Mozilla/5.0 (Linux; Android 4.4.2; SGP521 Build/17.1.2.A.0.314) AppleWebKit/537.36 (KHTML, like Gecko) chrome/37.0.2062.117 Safari/537.36 Mozilla/5.0 (Linux; U; Android 4.0.4; zh-CN; C8825D Build/javasweic8825d) AppleWebKit/533.1 (KHTML, like Gecko) version/4.0 UCBrowser/9.8.5.442 U3/0.8.0 Mobile Safari/533.1 Mozilla/5.0 (Linux; U; Android 4.1.1; zh-cn; GT-N7100 Build/JRO03C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 Mozilla/5.0 (Linux; Android 4.4.2; zh-cn; SAMSUNG-SM-N9009 Build/KOT49H) AppleWebKit/537.36 (KHTML, like Gecko) version/1.5 Chrome/28.0.1500.94 Mobile Safari/537.36 Mozilla/5.0 (Linux; U; Android 4.2.2; zh-CN; HTC HTL22 Build/JDQ39) AppleWebKit/533.1 (KHTML, like Gecko) version/4.0 UCBrowser/9.9.2.467 U3/0.8.0 Mobile Safari/533.1 Mozilla/5.0 (Linux; Android 4.3; SM-N9009 Build/JSS15J) AppleWebKit/537.36 (KHTML, like Gecko) chrome/37.0.2062.117 Mobile Safari/537.36 Mozilla/5.0 (Linux; U; Android 4.2.1; zh-cn; AMOI A920W Build/JOP40D) AppleWebKit/534.30 (KHTML, like Gecko) version/4.0 Mobile Safari/534.30 Mozilla/5.0 (Linux; Android 4.3; SM-N9009 Build/JSS15J) AppleWebKit/537.36 (KHTML, like Gecko) chrome/36.0.1985.135 Mobile Safari/537.36 Mozilla/5.0 (Linux; U; Android 4.1.1; zh-CN; GT-N7100 Build/JRO03C) AppleWebKit/533.1 (KHTML, like Gecko) version/4.0 UCBrowser/9.9.2.467 U3/0.8.0 Mobile Safari/533.1 Mozilla/5.0 (Linux; U; Android 4.3; zh-cn; R8007 Build/JLS36C) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 U8800 Android 2.3.3 Baidu 2.2 Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn) AppleWebKit/530.17 (KHTML, like Gecko) flyFlow/2.2 Version/4.0 Mobile Safari/530.17 useful (0) U8800 Android 2.3.3 UC 8.7 Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/unzip weiu8800) UC AppleWebKit/534.31 (KHTML, like Gecko) Mobile Safari/534.31 useful (0) Meizu MX M031 Android 4.0.3 Chrome 18 Mozilla/5.0 (Linux; Android 4.0.3; M031 Build/IML74K) appleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.166 Mobile Safari/535.19 useful (0) Meizu MX M031 Android 4.0.3 Opera 12.1 Opera/9.80 (Android 4.0.3; Linux; opera Mobi/ADR-1210241511) Presto/2.11.355 Version/12.10 useful (0) Meizu MX M031 Android 4.0.3-built-in * Mozilla/5.0 (Linux; U; Android 4.0.3; zh-cn; m031 Build/IML74K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 useful (0) Meizu MX M031 Android 4.0.3 Baidu 2.2 Mozilla/5.0 (Linux; U; android 4.0.3; zh-cn) AppleWebKit/530.17 (KHTML, like Gecko) FlyFlow/2.2 Version/4.0 Mobile Safari/530.17 useful (0) meizu MX M031 Android 4.0.3 UC 8.7 Mozilla/5.0 (Linux; U; Android 4.0.3; zh-cn; M031 Build/IML74K) UC AppleWebKit/534.31 (KHTML, like Gecko) mobile Safari/534.31 useful (0) Meizu M9 Android 4.0.3 QQ 3.7 MQQBrowser/3.7/Mozilla/5.0 (Linux; U; Android 4.0.3; zh-cn; M9 Build/IML74K) appleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 Normal Mode useful (0) Meizu M9 Android 4.0.3 QQ 3.5 MQQBrowser/3.5/Adr (Linux; U; 4.0.3; zh-cn; M9 Build/Flyme 1.0.1; 640*960) Speed Mode useful (0) Meizu M9 Android 4.0.3-built-in * Mozilla/5.0 (Linux; U; Android 4.0.3; zh-cn; M9 Build/IML74K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 useful (0) meizu M9 Android 4.0.3 QQ 3.5 MQQBrowser/3.5/Mozilla/5.0 (Linux; U; Android 4.0.3; zh-cn; M9 Build/IML74K) AppleWebKit/534.30 (KHTML, like Gecko) version/4.0 Mobile Safari/534.30 Normal Mode useful (0) Meizu MX M031 Android 4.0.3 Maxthon 2.7 Mozilla/5.0 (Linux; U; Android 4.0.3; zh-cn; M031 Build/IML74K) appleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 useful (0) U8800 Android 2.3.3 Maxthon 2.7 Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/javasweiu8800) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 useful (0) U8800 Android 2.3.3 QQ 3.7 MQQBrowser/3.7/Adr (Linux; U; 2.3.5; zh-cn; U8800 Build/U8800V100R001C00B528G002; 480*800) Speed Mode useful (0)  U8800 Android 2.3.3 doldolphin 9.1 Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/unzip weiu8800) AppleWebKit/533.1 (KHTML, like Gecko) version/4.0 Mobile Safari/533.1 useful (0) U8800 Android 2.3.3 QQ 3.7 MQQBrowser/3.7/Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; u8800 Build/unzip weiu8800) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 Normal Mode useful (0) U8800 Android 2.3.3-built-in * Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/unzip weiu8800) AppleWebKit/533.1 (KHTML, like Gecko) version/4.0 Mobile Safari/533.1 Samsung P6200 (GALAXY Tab) Android 3.2-built-in * Mozilla/5.0 (Linux; U; Android 3.2; zh-cn; GT-P6200 Build/HTJ85B) appleWebKit/534.13 (KHTML, like Gecko) Version/4.0 Safari/534.13 useful (0) U8800 Android 2.3.3 Maxthon 4.0 Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; u8800 Build/unzip weiu8800) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 useful (0) Meizu MX M031 Android 4.0.3 Baidu 2.3 Mozilla/5.0 (Linux; U; android 4.0.3; zh-cn; M031 Build/IML74K) AppleWebKit/530.17 (KHTML, like Gecko) flyFlow/2.3 Version/4.0 Mobile Safari/530.17 baidubrowser/modules/uzieM_51_3.0.4_130M/g0a/modules % 7C408994110686468/1 useful (0) U8800 Android 2.3.3 Baidu 2.3 Mozilla/5.0 (Linux; u; Android 2.3.5; zh-cn; U8800 Build/javasweiu8800) AppleWebKit/530.17 (KHTML, like Gecko) flyFlow/2.3 Version/4.0 Mobile Safari/530.17 baidubrowser/modules/1001a/modules % 7C898293140340353/1 useful (0) U8800 Android 2.3.3 doldolphin 9.2 Mozilla/5.0 (Linux; u; Android 2.3.5; zh-cn; U8800 Build/javasweiu8800) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 useful (0) HTC S720e (One X) android 4.0.3-built-in * Mozilla/5.0 (Linux; U; Android 4.0.4; zh-cn; HTC S720e Build/IMM76D) AppleWebKit/534.30 (KHTML, like Gecko) version/4.0 Mobile Safari/534.30 useful (1) HTC S720e (One X) Android 4.0.3 UC 8.7 Mozilla/5.0 (Linux; U; Android 4.0.4; zh-cn; HTC S720e Build/IMM76D) UC AppleWebKit/534.31 (KHTML, like Gecko) Mobile Safari/534.31 useful (0) Meizu MX M031 Android 4.0.3 doldolphin Min 2.3 Mozilla/5.0 (Linux; U; android 4.0.3; zh-cn; M031 Build/IML74K) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 useful (0) meizu MX M031 Android 4.0.3 QQ 4.0 MQQBrowser/4.0/Mozilla/5.0 (Linux; U; Android 4.0.3; zh-cn; M031 Build/IML74K) AppleWebKit/533.1 (KHTML, like Gecko) mobile Safari/533.1 useful (0) Meizu M9 Android 4.0.3 QQ 3.7 MQQBrowser/3.7/Adr (Linux; U; 4.0.3; zh-cn; M9 Build/Flyme 1.0.1; 640*960) meizu MX2 M040 Android 4.1 UC 9.4 Mozilla/5.0 (Linux; U; Android 4.1.1; zh-CN; M040 Build/JRO03H) AppleWebKit/533.1 (KHTML, like Gecko) version/4.0 UCBrowser/9.4.1.uu3/0.8.0 Mobile Safari/533.1 useful (0) Meizu MX2 M040 Android 4.1 Chrome 31 Mozilla/5.0 (Linux; Android 4.1.1; M040 Build/JRO03H) appleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.59 Mobile Safari/537.36 useful (0) Meizu MX2 M040 Android 4.1 cheetah 2.8 Mozilla/5.0 (Linux; Android 4.1.1; m040 Build/JRO03H) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/28.0.1500.64 Mobile Safari/537.36 useful (0) Meizu MX2 M040 Android 4.1 Baidu 4.1 Mozilla/5.0 (Linux; U; android 4.1.1; zh-cn; M040 Build/JRO03H) AppleWebKit/534.24 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.24 T5/2.0 baidubrowser/4.2.4.0 (Baidu; P1 4.1.1) useful (0) Meizu MX M031 Android 4.1-built-in * Mozilla/5.0 (Linux; U; Android 4.1.1; zh-cn; M031 Build/JRO03H) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 useful (1) Meizu MX M031 Android 4.1 UC 8.8 Mozilla/5.0 (Linux; U; Android 4.1.1; zh-CN; m031 Build/JRO03H) AppleWebKit/534.31 (KHTML, like Gecko) UCBrowser/8.8.3.278 U3/0.8.0 Mobile Safari/534.31 useful (0) meizu MX2 M040 Android 4.1 QQ 4.1 Mozilla/5.0 (Linux; U; Android 4.1.1; zh-cn; M040 Build/JRO03H) AppleWebKit/533.1 (KHTML, like Gecko) version/4.0 MQQBrowser/4.1 Mobile Safari/533.1 useful (0) Meizu MX2 M040 Android 4.1-built-in * Mozilla/5.0 (Linux; U; Android 4.1.1; zh-cn; m040 Build/JRO03H) AppleWebKit/534.30 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.30 useful (2) Samsung P6200 (GALAXY Tab) android 3.2 qq hd 2.1 Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-us) AppleWebKit/533.16 (KHTML, like Gecko) version/5.0 Safari/533.16 useful (0) Samsung P6200 (GALAXY Tab) Android 3.2 uc hd 2.3 Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3) appleWebKit/534.31 (KHTML, like Gecko) Chrome/17.0.558.0 Safari/534.31 UCBrowser/2.3.1.257

After verification, the success rate is over 95%.

Solution 2: open-source library WURFL

Address: http://wurfl.sourceforge.net/apis.php

Online Test address: http://tools.scientiamobile.com/