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Java Servlet獲取客戶端IP

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();  

    }

    System.out.println(ip);

注意:不要用localhost訪問