如何在 Java HttpServletRequest 中获取客户端 IP 地址

Question

我正在尝试开发一个 Java 网络应用程序 (Servlet)，我需要它来获取客户端 IP 地址。

到目前为止我的代码如下：

String ipAddress =  request.getRemoteAddr();

在这种情况下，大多数时候我会得到 'Default gateway address' (147.120.1.5)。不是我的机器IP地址(174.120.100.17).

String ipAddress = request.getHeader("X-FORWARDED-FOR");  
if (ipAddress == null) {  
    ipAddress = request.getRemoteAddr();  
}

在这种情况下，大多数时候我会得到 'Default gateway address' (147.120.1.5)。不是我的机器IP地址（174.120.100.17）。

InetAddress IP=InetAddress.getLocalHost();
System.out.println(IP.getHostAddress());

在这种情况下，我得到了服务器 IP 地址 (147.120.20.1)。

我的IP地址在147.120.100.17。现在我不知道如何获取真实的客户端IP地址。

非常感谢。

Answer 1

试试这个，

String ipAddress = request.getHeader("X-FORWARDED-FOR");  
if (ipAddress == null) {  
    ipAddress = request.getRemoteAddr();  
}

参考：http://www.mkyong.com/java/how-to-get-client-ip-address-in-java/

Answer 2

 import java.net.UnknownHostException;

/**
 * Simple Java program to find IP Address of localhost. This program uses
 * InetAddress from java.net package to find IP address.
 *
 */
public class IPTest { 

public static void main(String args[]) throws UnknownHostException {

    InetAddress addr = InetAddress.getLocalHost();

    //Getting IPAddress of localhost - getHostAddress return IP Address
    // in textual format
    String ipAddress = addr.getHostAddress();

    System.out.println("IP address of localhost from Java Program: " + ipAddress);

    //Hostname
    String hostname = addr.getHostName();
    System.out.println("Name of hostname : " + hostname);     
}
}

输出：

IP address of localhost from Java Program: 190.12.209.123
Name of hostname : PCLOND3433

Answer 3

以防万一，您正在尝试为 Dev-environment 获取 IP-address 那么您可以使用这个：-

public String processRegistrationForm(HttpServletRequest request)
{
    String appUrl = request.getScheme() + "://"+ request.getLocalAddr();
    return appUrl;
}

request.getLocalAddr()将return请求接收系统IP-address。

希望对您有所帮助。

Answer 4

试试这个。对于所有条件

private static final String[] HEADERS_TO_TRY = {
            "X-Forwarded-For",
            "Proxy-Client-IP",
            "WL-Proxy-Client-IP",
            "HTTP_X_FORWARDED_FOR",
            "HTTP_X_FORWARDED",
            "HTTP_X_CLUSTER_CLIENT_IP",
            "HTTP_CLIENT_IP",
            "HTTP_FORWARDED_FOR",
            "HTTP_FORWARDED",
            "HTTP_VIA",
            "REMOTE_ADDR" };

private String getClientIpAddress(HttpServletRequest request) {
    for (String header : HEADERS_TO_TRY) {
        String ip = request.getHeader(header);
        if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {
            return ip;
        }
    }

    return request.getRemoteAddr();
}

如何在 Java HttpServletRequest 中获取客户端 IP 地址

How to get client Ip Address in Java HttpServletRequest

java

ip

servlets