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 }
