【fix sonar】IPUtils文件

jero-boot/jero-boot-base/jero-boot-base-core/src/main/java/com/jero/common/util/IPUtils.java

@@ -8,51 +8,56 @@ import org.slf4j.LoggerFactory;
 
 /**
  * IP地址
- * 
+ *
  * @Author scott
  * @email test@163.com
  * @Date 2019年01月14日
  */
 public class IPUtils {
+    private IPUtils(){
+
+    }
+
 	private static Logger logger = LoggerFactory.getLogger(IPUtils.class);
 
 	/**
 	 * 获取IP地址
-	 * 
+	 *
 	 * 使用Nginx等反向代理软件， 则不能通过request.getRemoteAddr()获取IP地址
 	 * 如果使用了多级反向代理的话，X-Forwarded-For的值并不止一个，而是一串IP地址，X-Forwarded-For中第一个非unknown的有效IP字符串，则为真实IP地址
 	 */
 	public static String getIpAddr(HttpServletRequest request) {
     	String ip = null;
         try {
+            String unknown = "unknown";
             ip = request.getHeader("x-forwarded-for");
-            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
+            if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
                 ip = request.getHeader("Proxy-Client-IP");
             }
-            if (StringUtils.isEmpty(ip) || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {
+            if (StringUtils.isEmpty(ip) || ip.length() == 0 || unknown.equalsIgnoreCase(ip)) {
                 ip = request.getHeader("WL-Proxy-Client-IP");
             }
-            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
+            if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
                 ip = request.getHeader("HTTP_CLIENT_IP");
             }
-            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
+            if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
                 ip = request.getHeader("HTTP_X_FORWARDED_FOR");
             }
-            if (StringUtils.isEmpty(ip) || "unknown".equalsIgnoreCase(ip)) {
+            if (StringUtils.isEmpty(ip) || unknown.equalsIgnoreCase(ip)) {
                 ip = request.getRemoteAddr();
             }
         } catch (Exception e) {
         	logger.error("IPUtils ERROR ", e);
         }
-        
+
 //        //使用代理，则获取第一个IP地址
 //        if(StringUtils.isEmpty(ip) && ip.length() > 15) {
 //			if(ip.indexOf(",") > 0) {
 //				ip = ip.substring(0, ip.indexOf(","));
 //			}
 //		}
-        
+
         return ip;
     }
-	
+
 }