方案一：正则表达式
通过观察规律，得出以下表达式：
;\s?([^;]+?)\s?(Build)?/
Java代码：
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("通过userAgent解析出机型：" + model);
}
以下为部分UserAgent，供测试，可以直接在EditPlus里验证。
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/5.0.0.2215 Mozilla/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 V1_AND_SQ_5.0.0_146_YYB2_D QQ/5.0.0.2215 Mozilla/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/5.0.0.165 Mozilla/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/3.2.3 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 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/24.0.1565.82529 Mozilla/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; HUAWEI C8825D Build/HuaweiC8825D) 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; HUAWEI C8825D Build/HuaweiC8825D) AppleWebKit/537.36 (KHTML, like Gecko)Version/4.0 MQQBrowser/5.3 Mobile Safari/537.36 Mozilla/5.0 (Linux; Android 4.0.4; HUAWEI C8825D Build/HuaweiC8825D) 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; HUAWEI C8825D Build/HuaweiC8825D) 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-HUAWEI_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; HUAWEI C8825D Build/HuaweiC8825D) 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 Huawei 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 有用(0) Huawei U8800 Android 2.3.3 UC 8.7 Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/HuaweiU8800) UC AppleWebKit/534.31 (KHTML, like Gecko) Mobile Safari/534.31 有用(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 有用(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 有用(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 有用(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 有用(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 有用(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 有用(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 有用(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 有用(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 有用(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 有用(0) Huawei U8800 Android 2.3.3 Maxthon 2.7 Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/HuaweiU8800) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 有用(0) Huawei 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 有用(0) Huawei U8800 Android 2.3.3 Dolphin 9.1 Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/HuaweiU8800) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 有用(0) Huawei U8800 Android 2.3.3 QQ 3.7 MQQBrowser/3.7/Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/HuaweiU8800) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 Normal Mode 有用(0) Huawei U8800 Android 2.3.3 -built-in * Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/HuaweiU8800) 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 有用(0) Huawei U8800 Android 2.3.3 Maxthon 4.0 Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/HuaweiU8800) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 有用(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/023_1.41.3.2_diordna_069_046/uzieM_51_3.0.4_130M/1200a/963E77C7DAC3FA587DF3A7798517939D%7C408994110686468/1 有用(0) Huawei U8800 Android 2.3.3 Baidu 2.3 Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/HuaweiU8800) AppleWebKit/530.17 (KHTML, like Gecko) FlyFlow/2.3 Version/4.0 Mobile Safari/530.17 baidubrowser/042_1.6.3.2_diordna_008_084/IEWAUH_01_5.3.2_0088U/1001a/BE44DF7FABA8768B2A1B1E93C4BAD478%7C898293140340353/1 有用(0) Huawei U8800 Android 2.3.3 Dolphin 9.2 Mozilla/5.0 (Linux; U; Android 2.3.5; zh-cn; U8800 Build/HuaweiU8800) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1 有用(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 有用(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 有用(0) Meizu MX M031 Android 4.0.3 Dolphin 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 有用(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 有用(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/9.4.1.362 U3/0.8.0 Mobile Safari/533.1 有用(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 有用(0) Meizu MX2 M040 Android 4.1 猎豹 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 有用(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) 有用(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 有用(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 有用(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 有用(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 有用(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 有用(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
通过验证，成功率95%以上。
方案二：开源类库WURFL
地址：http://wurfl.sourceforge.net/apis.php
在线测试地址：http://tools.scientiamobile.com/
有什么更好的方式欢迎留言讨论。
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