JAVA如何獲取訪問用戶的客戶端IP（適用於公網與局域網）

/** 
 * 獲取訪問用戶的客戶端IP（適用於公網與局域網）. 
 */
public static final String getIpAddr(final HttpServletRequest request)  
        throws Exception {  
    if (request == null) {  
        throw (new Exception("getIpAddr method HttpServletRequest Object is null"));  
    }  
    String ipString = request.getHeader("x-forwarded-for");  
    if (StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {  
        ipString = request.getHeader("Proxy-Client-IP");  
    }  
    if (StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {  
        ipString = request.getHeader("WL-Proxy-Client-IP");  
    }  
    if (StringUtils.isBlank(ipString) || "unknown".equalsIgnoreCase(ipString)) {  
        ipString = request.getRemoteAddr();  
    }  
      
    // 多個路由時，取第一個非unknown的ip  
    final String[] arr = ipString.split(",");  
    for (final String str : arr) {  
        if (!"unknown".equalsIgnoreCase(str)) {  
            ipString = str;  
            break;  
        }  
    }  
      
    return ipString;  
}

作者：csdn博客 微wx笑