java中，如何获取真实的IP地址？

Posted 2023-05-10

参考技术A /**
* 获取客户端ip
* @param request
* @return
*/
HttpServletRequest request = ServletActionContext.getRequest();
String address = request.getHeader("X-Forwarded-For");
if (address != null && this.isIpAddress(address))
return address;

return request.getRemoteAddr(); 参考技术B import java.net.InetAddress;
import java.net.UnknownHostException;
public class NsLookup
static public void main(String[] args)
try InetAddress address = InetAddress.getByName(args[0]);
System.out.println(args[0]+": "+address.getHostAddress());
catch(UnknownHostException uhe)
System.err.println("Unable to find: "+args[0]);


参考技术C public static String getRemoteIP(HttpServletRequest request) if (request.getHeader("x-forwarded-for") == null) return request.getRemoteAddr(); return request.getHeader("x-forwarded-for");

Java中使用HttpRequest获取用户真实IP地址端口

Java中使用HttpRequest获取用户真实IP地址端口

 1 import javax.servlet.http.HttpServletRequest;  
 2   
 3 /** 
 4  * 自定义访问对象工具类 
 5  *  
 6  * 获取对象的IP地址等信息 
 7  * @author X-rapido 
 8  * 
 9  */  
10 public class CusAccessObjectUtil {  
11   
12     /** 
13      * 获取用户真实IP地址，不使用request.getRemoteAddr();的原因是有可能用户使用了代理软件方式避免真实IP地址, 
14 *  
16      * 可是，如果通过了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP值，究竟哪个才是真正的用户端的真实IP呢？ 
17      * 答案是取X-Forwarded-For中第一个非unknown的有效IP字符串。 
18      *  
19      * 如：X-Forwarded-For：192.168.1.110, 192.168.1.120, 192.168.1.130, 
20      * 192.168.1.100 
21      *  
22      * 用户真实IP为： 192.168.1.110 
23      *  
24      * @param request 
25      * @return 
26      */  
27     public static String getIpAddress(HttpServletRequest request) {  
28         String ip = request.getHeader("x-forwarded-for");  
29         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
30             ip = request.getHeader("Proxy-Client-IP");  
31         }  
32         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
33             ip = request.getHeader("WL-Proxy-Client-IP");  
34         }  
35         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
36             ip = request.getHeader("HTTP_CLIENT_IP");  
37         }  
38         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
39             ip = request.getHeader("HTTP_X_FORWARDED_FOR");  
40         }  
41         if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
42             ip = request.getRemoteAddr();  
43         }  
44         return ip;  
45     }  
46       
47 }  

/**

 *获取端口

 */

 1 public void doGet(HttpServletRequest request, HttpServletResponse response)
 2     throws ServletException, IOException {
 3    String uri = request.getRequestURI();//返回请求行中的资源名称
 4    String url = request.getRequestURL().toString();//获得客户端发送请求的完整url
 5    String ip = request.getRemoteAddr();//返回发出请求的IP地址
 6    String params = request.getQueryString();//返回请求行中的参数部分
 7    String host=request.getRemoteHost();//返回发出请求的客户机的主机名
 8    int port =request.getRemotePort();//返回发出请求的客户机的端口号。
 9    System.out.println(ip);
10    System.out.println(url);
11    System.out.println(uri);
12    System.out.println(params);
13    System.out.println(host);
14    System.out.println(port);
15 }