使用Java实现B/S系统常见的获取客户端信息功能！

写B/S系统的时候，获取并将每个客户的信息保存起来，对于以后的维护和优化可以更有目的性

可以知道使用系统的用户中，使用最多的是哪种版本的浏览器，然后可以有针对性的，将系统兼容性尽量提高！

以下是工具类（ClientInfo.java）：

 1 package com.ITPlus.tools;   
 2   
 3  import java.util.regex.Matcher;   
 4  import java.util.regex.Pattern;   
 5   
 6  /*  
 7  * 返回客户端信息工具类  
 8  * by netwild  
 9  */   
10  public class ClientInfo {   
11   
12     private String info = "";   
13     private String explorerVer = "未知";   
14     private String OSVer = "未知";   
15   
16     /*  
17      * 构造函数  
18      * 参数：String request.getHeader("user-agent")  
19      *   
20      * IE7:Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)  
21      * IE8:Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C)  
22      * Maxthon:Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; .NET4.0C; Maxthon 2.0)  
23      * firefox:Mozilla/5.0 (Windows; U; Windows NT 6.1; zh-CN; rv:1.9.2.11) Gecko/20101012 Firefox/3.6.11  
24      * Chrome:Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.7 (KHTML, like Gecko) Chrome/7.0.517.44 Safari/534.7  
25      * Opera:Opera/9.80 (Windows NT 6.1; U; zh-cn) Presto/2.6.30 Version/10.63  
26      *   
27      * 操作系统：  
28      * Win7 : Windows NT 6.1  
29      * WinXP : Windows NT 5.1  
30      */   
31     public ClientInfo(String info){   
32         this.info = info;   
33     }   
34   
35     /*  
36      * 获取核心浏览器名称  
37      */   
38     public String getExplorerName(){   
39         String str = "未知";   
40         Pattern pattern = Pattern.compile("");   
41         Matcher matcher;   
42         if(info.indexOf("MSIE") != -1){   
43             str = "MSIE"; //微软IE   
44              pattern = Pattern.compile(str + "\\s([0-9.]+)");   
45         }else if(info.indexOf("Firefox") != -1){   
46             str = "Firefox"; //火狐   
47              pattern = Pattern.compile(str + "\\/([0-9.]+)");   
48         }else if(info.indexOf("Chrome") != -1){   
49             str = "Chrome"; //Google   
50             pattern = Pattern.compile(str + "\\/([0-9.]+)");   
51         }else if(info.indexOf("Opera") != -1){   
52             str = "Opera"; //Opera   
53             pattern = Pattern.compile("Version\\/([0-9.]+)");   
54         }   
55         matcher = pattern.matcher(info);   
56         if(matcher.find()) explorerVer = matcher.group(1);   
57         return str;   
58     }   
59   
60     /*  
61      * 获取核心浏览器版本  
62      */   
63     public String getExplorerVer(){   
64         return this.explorerVer;   
65     }   
66   
67     /*  
68      * 获取浏览器插件名称（例如：遨游、世界之窗等）  
69      */   
70     public String getExplorerPlug(){   
71         String str = "无";   
72         if(info.indexOf("Maxthon") != -1)   
73             str = "Maxthon"; //遨游   
74         return str;    
75     }   
76        
77     /*  
78      * 获取操作系统名称  
79      */   
80     public String getOSName(){   
81         String str = "未知";   
82         Pattern pattern = Pattern.compile("");   
83         Matcher matcher;   
84         if(info.indexOf("Windows") != -1){   
85             str = "Windows"; //Windows NT 6.1   
86             pattern = Pattern.compile(str + "\\s([a-zA-Z0-9]+\\s[0-9.]+)");   
87         }   
88         matcher = pattern.matcher(info);   
89         if(matcher.find()) OSVer = matcher.group(1);   
90         return str;    
91     }   
92        
93     /*  
94      * 获取操作系统版本  
95      */   
96     public String getOSVer(){   
97         return this.OSVer;   
98     }   
99 }   

调用方式：

 //初始化ClientInfo对象，唯一的参数：request.getHeader("user-agent")   
2 ClientInfo clientInfo = new ClientInfo(request.getHeader("user-agent"));   
3 //获取核心浏览器名称并保存到登录信息对象（loginlog）的相应属性中   
4 loginlog.setExplorerName(clientInfo.getExplorerName());   
5 loginlog.setExplorerVer(clientInfo.getExplorerVer());   
6 loginlog.setExplorerPlug(clientInfo.getExplorerPlug());   
7 loginlog.setOsname(clientInfo.getOSName());   
8 loginlog.setOsver(clientInfo.getOSVer());