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Java获取请求ip地址

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    public String checkIpAddress(HttpServletRequest request) {  

      String ip = request.getHeader("x-forwarded-for");   

      if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {   

       ip = request.getHeader("Proxy-Client-IP");   

      }   

      if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {   

       ip = request.getHeader("WL-Proxy-Client-IP");   

      }   

      if(ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {   

       ip = request.getRemoteAddr();   

      }   

      return ip;  

     }  

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