java使用IpUtil获取真实ip地址 

 2 
 3 import org.apache.commons.lang3.text.StrTokenizer;
 4 
 5 import javax.servlet.http.HttpServletRequest;
 6 import java.util.regex.Pattern;
 7 
 8 /**
 9  * IpV4 获取真实ip地址
10  */
11 public class IpUtil {
12 
13     public static final String _255 = "(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)";
14     public static final Pattern pattern = Pattern.compile("^(?:" + _255 + "\\.){3}" + _255 + "$");
15 
16     /**
17      * String类型ip转为Long类型
18      *
19      * @param longIp
20      * @return String
21      */
22     public static String longToIpV4(long longIp) {
23         int octet3 = (int) ((longIp >> 24) % 256);
24         int octet2 = (int) ((longIp >> 16) % 256);
25         int octet1 = (int) ((longIp >> 8) % 256);
26         int octet0 = (int) ((longIp) % 256);
27         return octet3 + "." + octet2 + "." + octet1 + "." + octet0;
28     }
29 
30     /**
31      * Long类型ip转为String类型
32      *
33      * @param longIp
34      * @return Long
35      */
36     public static long ipV4ToLong(String ip) {
37         String[] octets = ip.split("\\.");
38         return (Long.parseLong(octets[0]) << 24) + (Integer.parseInt(octets[1]) << 16)
39                 + (Integer.parseInt(octets[2]) << 8) + Integer.parseInt(octets[3]);
40     }
41 
42     /**
43      * @param ip
44      * @return boolean
45      */
46     public static boolean isIPv4Private(String ip) {
47         long longIp = ipV4ToLong(ip);
48         return (longIp >= ipV4ToLong("10.0.0.0") && longIp <= ipV4ToLong("10.255.255.255"))
49                 || (longIp >= ipV4ToLong("172.16.0.0") && longIp <= ipV4ToLong("172.31.255.255"))
50                 || longIp >= ipV4ToLong("192.168.0.0") && longIp <= ipV4ToLong("192.168.255.255");
51     }
52 
53     public static boolean isIPv4Valid(String ip) {
54         return pattern.matcher(ip).matches();
55     }
56 
57     /**
58      * 获取String类型真实ip地址，基于反向代理。
59      *
60      * @param request
61      * @return
62      * 在反向代理中将X-Forward-For替换为remote_addr，即，真实的IP地址。
63      */
64     public static String getIpFromRequest(HttpServletRequest request) {
65         String ip;
66         boolean found = false;
67         if ((ip = request.getHeader("x-forwarded-for")) != null) {
68             StrTokenizer tokenizer = new StrTokenizer(ip, ",");
69             while (tokenizer.hasNext()) {
70                 ip = tokenizer.nextToken().trim();
71                 if (isIPv4Valid(ip) && !isIPv4Private(ip)) {
72                     found = true;
73                     break;
74                 }
75             }
76         }
77         if (!found) {
78             ip = request.getRemoteAddr();// 获得ip地址
79         }
80         return ip;
81     }
82 }

 

posted @ 2019-08-27 17:00  woldcn  阅读(2047)  评论(0)    收藏  举报