1.User-Agent是可以偽造的

2.User-Agent中含有作業系統和版本資訊

package com.baosight.webapp.util;

public class UserAgentUtil {
	public static String android="Android";
	public static String iphone="iPhone";
	public static String ipad="iPad";
	//獲取使用者作業系統
	public static String getOS(String userAgent){
		if (userAgent.contains(android)) {
			return android;
		}else if (userAgent.contains(iphone)){
			return iphone;
		}else if (userAgent.contains(ipad)){
			return ipad;
		}else {
			return "others";
		}
	}
	//獲取使用者手機型號
	public static String getPhone(String userAgent){
		String OS=UserAgentUtil.getOS(userAgent);
		String phoneStr="不知名的手機";
		if (OS.equals(android)) {
			String rex="[()]+";
			String[] str=userAgent.split(rex);
			str = str[1].split("[;]");
			String[] res=str[str.length-1].split("Build/");
			return res[0];
		}else if (OS.equals(iphone)) {
			String[] str=userAgent.split("[()]+");
			String res="iphone"+str[1].split("OS")[1].split("like")[0];
			return res;
		}else if (OS.equals(ipad)) {
			return ipad;
		}else {
			return "火星人";
		}


	}
	public static void main(String[] args) {
		/*String phone="Mozilla/5.0 (Linux; U; Android 1.5; ja-jp; GDDJ-09 Build/CDB56) AppleWebKit/528.5+ (KHTML, like Gecko) Version/3.1.2 Mobile Safari/525.20.1";
		String rex="[()]+";
		String[] str=phone.split(rex);
		str = str[1].split("[;]");
		String[] res=str[str.length-1].split("Build/");
		System.out.println(res[0]);*/
		String userAgent="User-agent==Mozilla/5.0 (iPhone; CPU iPhone OS 9_3_2 like Mac OS X) AppleWebKit/601.1.46 (KHTML, like Gecko) Version/9.0 Mobile/13F69 Safari/601.1";
		String[] str=userAgent.split("[()]+");
		String res="iphone"+str[1].split("OS")[1].split("like")[0];
		System.out.println(res);
	}

}
 

3常見機型的UserAgent見如下連結