怎么获取请求的ip地址,java代码示例

获取请求的ip地址可以通过获取HttpServletRequest对象，从中获取remoteAddr属性来实现。以下是一个Java代码示例：

import javax.servlet.http.HttpServletRequest;

public class IPUtils {
  public static String getClientIpAddress(HttpServletRequest request) {
    String ipAddress = request.getHeader("x-forwarded-for");
    if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
      ipAddress = request.getHeader("Proxy-Client-IP");
    }
    if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
      ipAddress = request.getHeader("WL-Proxy-Client-IP");
    }
    if (ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) {
      ipAddress = request.getRemoteAddr();
    }
    return ipAddress;
  }
}

在使用时，可以通过以下代码获取请求的IP地址：

HttpServletRequest request = ...; // 获取HttpServletRequest对象
String ipAddress = IPUtils.getClientIpAddress(request);