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.