Java限制IP访问页面 实现方式

//最简单的获取外网ip的方法。可以直接用，但是没啥用..
<script src="http://pv.sohu.com/cityjson?ie=utf-8"></script>
<script>
    document.write(returnCitySN["cip"]);
</script>

function getIP(callback) {
        let recode = {};
        let RTCPeerConnection = window.RTCPeerConnection || window.mozRTCPeerConnection || window.webkitRTCPeerConnection;
        // 如果不存在则使用一个iframe绕过
        if (!RTCPeerConnection) {
            // 因为这里用到了iframe，所以在调用这个方法的script上必须有一个iframe标签
            // <iframe id="iframe" sandbox="allow-same-origin" style="display:none;"></iframe>
            let win = iframe.contentWindow;
            RTCPeerConnection = win.RTCPeerConnection || win.mozRTCPeerConnection || win.webkitRTCPeerConnection;
        }
 
        //创建实例，生成连接
        let pc = new RTCPeerConnection();
 
        // 匹配字符串中符合ip地址的字段
        function handleCandidate(candidate) {
        debugger;
            let ip_regexp = /([0-9]{1,3}(\.[0-9]{1,3}){3}|([a-f0-9]{1,4}((:[a-f0-9]{1,4}){7}|:+[a-f0-9]{1,4}){6}))/;
            let ip_isMatch = candidate.match(ip_regexp)[1];
            if (!recode[ip_isMatch]) {
                callback(ip_isMatch);
                recode[ip_isMatch] = true;
            }
        }
 
        //监听icecandidate事件
        pc.onicecandidate = (ice) => {
            if (ice.candidate) {
                handleCandidate(ice.candidate.candidate);
            }
        };
        //建立一个伪数据的通道
        pc.createDataChannel('');
        pc.createOffer((res) => {
            pc.setLocalDescription(res);
        }, () => {});
 
        //延迟，让一切都能完成
        setTimeout(() => {
            let lines = pc.localDescription.sdp.split('\n');
            lines.forEach(item => {
                if (item.indexOf('a=candidate:') === 0) {
                    handleCandidate(item);
                }
            })
        }, 1000);
    }
getIP(function (ip) { alert(ip); });

  String ip = request.getHeader("x-forwarded-for");
  
         if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
  
             ip = request.getHeader("Proxy-Client-IP");
         }
         if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
  
             ip = request.getHeader("WL-Proxy-Client-IP");
         }
         if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
  
             ip = request.getRemoteAddr();
         }
         System.out.println(ip);

/**
     * 判断文章是否有权可看
     * 
     * @param map
     * @return
     */
    @RequestMapping("/isIntranet.do")
    @ResponseBody
    public String isIntranet(ServletRequest request, ServletResponse response) {
        Map<String, Object> map = new HashMap<String, Object>();
        HttpServletRequest req = (HttpServletRequest)request;
        HttpServletResponse resp = (HttpServletResponse)response;
        // 判断访问者Ip是否白名单内
        boolean flag = isIPOK(req, resp);
        System.out.println(flag);
        if (flag) {
            return "true";
        } else {
            return "false";
        }
    }
 
    private boolean isIPOK(HttpServletRequest request, HttpServletResponse response) {
        // String accessIP = IPUtil.getUserIp(request);
 
        String ip = request.getHeader("x-forwarded-for");
 
        if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
 
            ip = request.getHeader("Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
 
            ip = request.getHeader("WL-Proxy-Client-IP");
        }
        if (ip == null || ip.length() == 0 || "nuknown".equalsIgnoreCase(ip)) {
 
            ip = request.getRemoteAddr();
        }
        System.out.println(ip);
        return isLAN(ip);
    }
 
    // 是否为内网网段
    public boolean isLAN(String ip) {
        if ("127.0.0.1".equals(ip)) {
            return true;
        }
        boolean result = true;
        try {
            Properties prop = new Properties();
            //获取设置Ip段的配置文件
            InputStream in = this.getClass().getClassLoader().getResourceAsStream("ipConfig.properties");
            prop.load(in);
 
            // 遍历取值
            Set<Object> objects = prop.keySet();
            for (Object object : objects) {
                String ipNot = new String(prop.getProperty((String)object).getBytes("iso-8859-1"), "gbk");
                System.out.println(ipNot);
                /*result = ipIsValid("192.168.8.78-192.168.255.255", ip) || ipIsValid("172.16.0.0-172.31.255.255", ip)
                    || ipIsValid("10.0.0.0-10.255.255.255", ip);*/
                result = ipIsValid(ipNot, ip);
            }
            in.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }
     
    //校验Ip是否包含在Ip段内
    public static boolean ipIsValid(String ipSection, String ip) {
        if (ipSection == null) {
            throw new NullPointerException("IP段不能为空！");
        }
        if (ip == null) {
            throw new NullPointerException("IP不能为空！");
        }
        ipSection = ipSection.trim();
        ip = ip.trim();
        final String REGX_IP =
            "((25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)\\.){3}(25[0-5]|2[0-4]\\d|1\\d{2}|[1-9]\\d|\\d)";
        final String REGX_IPB = REGX_IP + "\\-" + REGX_IP;
        if (!ipSection.matches(REGX_IPB) || !ip.matches(REGX_IP)) {
            return false;
        }
        int idx = ipSection.indexOf('-');
        idx = idx < 0 ? ipSection.length() : idx;
        String[] sips = ipSection.substring(0, idx).split("\\.");
        String[] sipe = ipSection.substring(idx + 1).split("\\.");
        String[] sipt = ip.split("\\.");
        long ips = 0L, ipe = 0L, ipt = 0L;
        for (int i = 0; i < 4; ++i) {
            ips = ips << 8 | Integer.parseInt(sips[i]);
            ipe = ipe << 8 | Integer.parseInt(sipe[i]);
            ipt = ipt << 8 | Integer.parseInt(sipt[i]);
        }
        if (ips > ipe) {
            long t = ips;
            ips = ipe;
            ipe = t;
        }
        return ips <= ipt && ipt <= ipe;
    }