網站中投票器的處理機制

第一，直接用IP判斷，這種方式就是一個IP只能投票一定次數，方法可用下面程式碼中的getIpAddr() 中得到ipAddress的返回值判斷即可。

第二，用MAC網絡卡標識進行判斷，一臺機器只能投票一定次數，方法可用下面程式碼中的getMAXAddress.但是此方法在很多閘道器設定了防火牆的情況下無法得到，而且還會造成異常警告，而且捕捉這個警告的時間還非常長，因此慎用。

第三，用ip地址和計算機名稱聯合判斷，一個網段中計算機名稱是不允許重名的，因此可用ip加計算機名稱聯合判斷。方法可用下面程式碼中的getIpAddr() 的最後返回值即可

/** * 根據IP地址獲取客戶端的MAC * @param ipAddress * @return * @throws IOException */ public static String getMACAddress(String ipAddress) throws IOException { System.out.println("客戶端的IP地址為："+ipAddress); String str = "", strMAC = "", macAddress = ""; Process pp = Runtime.getRuntime().exec("nbtstat -a " + ipAddress); InputStreamReader ir = new InputStreamReader(pp.getInputStream()); LineNumberReader input = new LineNumberReader(ir); for (int i = 1; i < 100; i++) { str = input.readLine(); if (str != null) { if (str.indexOf("MAC Address") > 1) { strMAC = str.substring(str.indexOf("MAC Address") + 14,str.length()); break; } } } if (strMAC.length() < 17) { return "Error!"; } macAddress = strMAC.substring(0, 2) + ":" + strMAC.substring(3, 5)+ ":" + strMAC.substring(6, 8) + ":" + strMAC.substring(9, 11)+ ":" + strMAC.substring(12, 14) + ":"+ strMAC.substring(15, 17); System.out.println("客戶端的MAC地址為："+macAddress); return macAddress; } /** * 獲取客戶端IP地址 * @return */ public static String getIpAddr() throws IOException{ HttpServletRequest req=ServletActionContext.getRequest(); String ipAddress = req.getHeader("x-forwarded-for"); if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) ipAddress = req.getHeader("Proxy-Client-IP"); if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) ipAddress = req.getHeader("WL-Proxy-Client-IP"); if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) ipAddress = req.getHeader("HTTP_X_FORWARDED_FOR"); if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) ipAddress = req.getHeader("HTTP_CLIENT_IP"); if(ipAddress == null || ipAddress.length() == 0 || "unknown".equalsIgnoreCase(ipAddress)) ipAddress = req.getRemoteAddr(); String host = req.getRemoteHost(); String ip = ipAddress+":"+host; System.out.println("訪問者IP="+ip); return ip; }