java中獲取當前服務器地址主要使用到InetAddress這個類

 1 public static void main(String[] args) {
 2         try {
 3             //用 getLocalHost() 方法創建的InetAddress的對象
 4             InetAddress address = InetAddress.getLocalHost();
 5             System.out.println(address.getHostName());//主機名
 6             System.out.println(address.getCanonicalHostName());//主機別名
 7             System.out.println(address.getHostAddress());//獲取IP地址
 8             System.out.println("===============");
 9             
10             //用域名創建 InetAddress對象
11             InetAddress address1 = InetAddress.getByName("www.wodexiangce.cn");
12             //獲取的是該網站的ip地址，如果我們所有的請求都通過nginx的，所以這里獲取到的其實是nginx服務器的IP地址
13             System.out.println(address1.getHostName());//www.wodexiangce.cn
14             System.out.println(address1.getCanonicalHostName());//124.237.121.122
15             System.out.println(address1.getHostAddress());//124.237.121.122
16             System.out.println("===============");
17             
18             //用IP地址創建InetAddress對象
19             InetAddress address2 = InetAddress.getByName("220.181.111.188");
20             System.out.println(address2.getHostName());//220.181.111.188
21             System.out.println(address2.getCanonicalHostName());//220.181.111.188
22             System.out.println(address2.getHostAddress());//220.181.111.188
23             System.out.println("===============");
24             
25             //根據主機名返回其可能的所有InetAddress對象
26             InetAddress[] addresses = InetAddress.getAllByName("www.baidu.com");
27             for (InetAddress addr : addresses) {
28                 System.out.println(addr);
29                 //www.baidu.com/220.181.111.188
30                 //www.baidu.com/220.181.112.244
31             }
32         } catch (UnknownHostException e) {
33             e.printStackTrace();
34         }
35     }

如果使用了反向代理，這種獲取方式顯然是不準確的，我們采用的方法是新建一個java類，里面配的是當前服務器的IP地址（也就是說這個類在每個節點服務器上部署的是不同的），程序里用的話直接獲取這個工具類就可以了，雖然方法有點笨，但是解決問題了。

1 public class CommonServerIP {
2     /**
3      * #######################################################################
4      * ###############這個類主要是保存常用的一些固定的服務器IP#####################
5      * ####################################################################### 
6      */
7      public static String CURRENT_SERVER="124.237.121.46";//當前服務器的ip地址
8 }

根據HttpServletRequest對象獲取ip

 1     public String getIpAddress(HttpServletRequest request) {
 2         // 獲取請求主機IP地址,如果通過代理進來，則透過防火墻獲取真實IP地址
 3         try {
 4             String ip = request.getHeader("X-Forwarded-For");
 5 
 6             if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
 7                 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
 8                     ip = request.getHeader("Proxy-Client-IP");
 9                 }
10                 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
11                     ip = request.getHeader("WL-Proxy-Client-IP");
12                 }
13                 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
14                     ip = request.getHeader("HTTP_CLIENT_IP");
15                 }
16                 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
17                     ip = request.getHeader("HTTP_X_FORWARDED_FOR");
18                 }
19                 if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
20                     ip = request.getRemoteAddr();
21                 }
22             } else if (ip.length() > 15) {
23                 String[] ips = ip.split(",");
24                 for (int index = 0; index < ips.length; index++) {
25                     String strIp = ips[index];
26                     if (!("unknown".equalsIgnoreCase(strIp))) {
27                         ip = strIp;
28                         break;
29                     }
30                 }
31             }
32             return ip;
33         } catch (Exception e) {
34             e.printStackTrace();
35             return "";
36         }
37     }

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