String realIp = IPUtil.getIpAddr(request);          
if(!"0:0:0:0:0:0:0:1".equals(realIp)){
    List<String> ipList = Resources.readLines(Resources.getResource("ipWhiteList.txt"),Charset.forName("utf-8"));
    if(!IPWhiteListUtil.checkIpList(realIp, ipList)){
        retMap.put("code", ILLEGAL_IP);
        retMap.put
 
("msg", "非法IP,請聯絡管理員");
        return retMap;
    }
}

工具類：

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.regex.Pattern;

/**
 * @ClassName:IPWhiteList
 * @Function: IP 白名單.
 * @Reason:關於IP白名單相關.
 * @Date: 2017-4-17 下午02:49:08
 * @author
 
 hello_史努比
 * @version
 */
public class IPWhiteListUtil {
    // IP的正則
    private static Pattern pattern = Pattern
            .compile("(1\\d{1,2}|2[0-4]\\d|25[0-5]|\\d{1,2})\\."
                    + "(1\\d{1,2}|2[0-4]\\d|25[0-5]|\\d{1,2})\\."
                    + "(1\\d{1,2}|2[0-4]\\d|25[0-5]|\\d{1,2})\\."
 

                    + "(1\\d{1,2}|2[0-4]\\d|25[0-5]|\\d{1,2})");

    /**
     * 
     * getAvaliIpList:(根據IP白名單設定獲取可用的IP列表).
     * 
     * @date 2017-4-17 下午02:50:20
     * @param ipConfig
     * @return
     */
    private static Set<String> getAvaliIpList(String allowIp) {
        Set<String> ipList = new HashSet<String>();
        for (String allow : allowIp.replaceAll("\\s", "").split(";")) {
            if (allow.indexOf("*") > -1) {
                String[] ips = allow.split("\\.");
                String[] from = new String[] { "0", "0", "0", "0" };
                String[] end = new String[] { "255", "255", "255", "255" };
                List<String> tem = new ArrayList<String>();
                for (int i = 0; i < ips.length; i++)
                    if (ips[i].indexOf("*") > -1) {
                        tem = complete(ips[i]);
                        from[i] = null;
                        end[i] = null;
                    } else {
                        from[i] = ips[i];
                        end[i] = ips[i];
                    }

                StringBuffer fromIP = new StringBuffer();
                StringBuffer endIP = new StringBuffer();
                for (int i = 0; i < 4; i++)
                    if (from[i] != null) {
                        fromIP.append(from[i]).append(".");
                        endIP.append(end[i]).append(".");
                    } else {
                        fromIP.append("[*].");
                        endIP.append("[*].");
                    }
                fromIP.deleteCharAt(fromIP.length() - 1);
                endIP.deleteCharAt(endIP.length() - 1);

                for (String s : tem) {
                    String ip = fromIP.toString().replace("[*]",
                            s.split(";")[0])
                            + "-"
                            + endIP.toString().replace("[*]", s.split(";")[1]);
                    if (validate(ip)) {
                        ipList.add(ip);
                    }
                }
            } else {
                if (validate(allow)) {
                    ipList.add(allow);
                }
            }
        }
        return ipList;
    }
    private static Set<String> getAvaliIpList(Set<String> ipSet) {
        Set<String> ipList = new HashSet<String>();
        for (String allow : ipSet) {
            if (allow.indexOf("*") > -1) {
                String[] ips = allow.split("\\.");
                String[] from = new String[] { "0", "0", "0", "0" };
                String[] end = new String[] { "255", "255", "255", "255" };
                List<String> tem = new ArrayList<String>();
                for (int i = 0; i < ips.length; i++)
                    if (ips[i].indexOf("*") > -1) {
                        tem = complete(ips[i]);
                        from[i] = null;
                        end[i] = null;
                    } else {
                        from[i] = ips[i];
                        end[i] = ips[i];
                    }

                StringBuffer fromIP = new StringBuffer();
                StringBuffer endIP = new StringBuffer();
                for (int i = 0; i < 4; i++)
                    if (from[i] != null) {
                        fromIP.append(from[i]).append(".");
                        endIP.append(end[i]).append(".");
                    } else {
                        fromIP.append("[*].");
                        endIP.append("[*].");
                    }
                fromIP.deleteCharAt(fromIP.length() - 1);
                endIP.deleteCharAt(endIP.length() - 1);

                for (String s : tem) {
                    String ip = fromIP.toString().replace("[*]",
                            s.split(";")[0])
                            + "-"
                            + endIP.toString().replace("[*]", s.split(";")[1]);
                    if (validate(ip)) {
                        ipList.add(ip);
                    }
                }
            } else {
                if (validate(allow)) {
                    ipList.add(allow);
                }
            }
        }
        return ipList;
    }
    /**
     * 對單個IP節點進行範圍限定
     * 
     * @param arg
     * @return 返回限定後的IP範圍，格式為List[10;19, 100;199]
     */
    private static List<String> complete(String arg) {
        List<String> com = new ArrayList<String>();
        if (arg.length() == 1) {
            com.add("0;255");
        } else if (arg.length() == 2) {
            String s1 = complete(arg, 1);
            if (s1 != null)
                com.add(s1);
            String s2 = complete(arg, 2);
            if (s2 != null)
                com.add(s2);
        } else {
            String s1 = complete(arg, 1);
            if (s1 != null)
                com.add(s1);
        }
        return com;
    }

    private static String complete(String arg, int length) {
        String from = "";
        String end = "";
        if (length == 1) {
            from = arg.replace("*", "0");
            end = arg.replace("*", "9");
        } else {
            from = arg.replace("*", "00");
            end = arg.replace("*", "99");
        }
        if (Integer.valueOf(from) > 255)
            return null;
        if (Integer.valueOf(end) > 255)
            end = "255";
        return from + ";" + end;
    }

    /**
     * 在新增至白名單時進行格式校驗
     * 
     * @param ip
     * @return
     */
    private static boolean validate(String ip) {
        for (String s : ip.split("-"))
            if (!pattern.matcher(s).matches()) {
                return false;
            }
        return true;
    }

    /**
     * 
     * checkLoginIP:(根據IP,及可用Ip列表來判斷ip是否包含在白名單之中).
     * @date 2017-4-17 下午03:01:03
     * @param ip
     * @param ipList
     * @return
     */
    private static boolean checkLoginIP(String ip, Set<String> ipList) {
        if (ipList.contains(ip))
            return true;
        else {
            for (String allow : ipList) {
                if (allow.indexOf("-") > -1) {
                    String[] from = allow.split("-")[0].split("\\.");
                    String[] end = allow.split("-")[1].split("\\.");
                    String[] tag = ip.split("\\.");

                    // 對IP從左到右進行逐段匹配
                    boolean check = true;
                    for (int i = 0; i < 4; i++) {
                        int s = Integer.valueOf(from[i]);
                        int t = Integer.valueOf(tag[i]);
                        int e = Integer.valueOf(end[i]);
                        if (!(s <= t && t <= e)) {
                            check = false;
                            break;
                        }
                    }
                    if (check) {
                        return true;
                    }
                }
            }
        }
        return false;
    }

    /**
     * 
     * checkLoginIP:(根據IP地址，及IP白名單設定規則判斷IP是否包含在白名單).
     * @date 2017-4-17 下午03:01:37
     * @param ip
     * @param ipWhiteConfig
     * @return
     */
    public static boolean checkLoginIP(String ip,String ipWhiteConfig){
        Set<String> ipList = getAvaliIpList(ipWhiteConfig);
        return checkLoginIP(ip, ipList);
    }

    /**
     * 
    * ip在ipList中，則返回true 
    * @param ip
    * @param ipList
    * @return
    * @see
     */
    public static boolean checkIpList(String ip,List<String> ipList){
        Set<String> ipSet = new HashSet<String>();
        for(String ipStr : ipList){
            if(!ipStr.trim().startsWith("#")){
                ipSet.add(ipStr.trim());
            }
        }
        ipSet = getAvaliIpList(ipSet);
        return checkLoginIP(ip, ipSet);
    }


    public static void main(String[] args) {
        String ipWhilte = "192.168.1.1;" +                 //設定單個IP的白名單
                          "192.168.2.*;" +                 //設定ip萬用字元,對一個ip段進行匹配
                          "192.168.3.17-192.168.3.38";     //設定一個IP範圍
        boolean flag = checkLoginIP("192.168.2.2",ipWhilte);
        boolean flag2 = checkLoginIP("192.168.1.2",ipWhilte);
        boolean flag3 = checkLoginIP("192.168.3.16",ipWhilte);
        boolean flag4 = checkLoginIP("192.168.3.17",ipWhilte);
        System.out.println(flag);  //true
        System.out.println(flag2);  //false
        System.out.println(flag3);  //false
        System.out.println(flag4);  //true
    }
}

import javax.servlet.http.HttpServletRequest;

public class IPUtil {
    /** 
     * 獲取使用者真實IP地址，不使用request.getRemoteAddr()的原因是有可能使用者使用了代理軟體方式避免真實IP地址, 
     * 可是，如果通過了多級反向代理的話，X-Forwarded-For的值並不止一個，而是一串IP值 
     *  
     * @return ip
     */
    public static String getIpAddr(HttpServletRequest request) {
        String ip = request.getHeader("x-forwarded-for"); 
        if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase(ip)) {  
            // 多次反向代理後會有多個ip值，第一個ip才是真實ip
            if( ip.indexOf(",")!=-1 ){
                ip = ip.split(",")[0];
            }
        }  
        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.getHeader("HTTP_CLIENT_IP");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getHeader("HTTP_X_FORWARDED_FOR");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getHeader("X-Real-IP");  
        }  
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase(ip)) {  
            ip = request.getRemoteAddr();  
        } 
        return ip;  
    }
}