支付宝请求来源ip验证

class IpUtils {  
public static String getIpAddr(HttpServletRequest request) {  
"X-Forwarded-For");  
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
"Proxy-Client-IP");  
            }  
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
"WL-Proxy-Client-IP");  
            }  
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
"HTTP_CLIENT_IP");  
            }  
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
"HTTP_X_FORWARDED_FOR");  
            }  
if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
                ip = request.getRemoteAddr();  
            }  
return ip;  
        }  
}

2：检查服务器配置（以下为参考检查方向）
      DNS解析，是否能够解析支付宝IP。支付宝IP范围是：
      121.0.26.0/23（IP范围：121.0.26.1----121.0.27.254）
      110.75.128.0/19（IP范围：110.75.128.1——110.75.159.254）
      115.124.16.0/24（IP范围：115.124.16.1——115.124.16.254）

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