Spring boot拦截器实现IP黑名单的完整步骤
一·业务场景和需要实现的功能
以redis作为IP存储地址实现。
业务场景:针对秒杀活动或者常规电商业务场景等,防止恶意脚本不停的刷接口。
实现功能:写一个拦截器拦截掉黑名单IP,额外增加一个接口,将ip地址添加到redis中,并且返回redis中当前全部ip
二·Springboot中定义一个拦截器
@Order(0)@Aspect@Componentpublic class AopInterceptor { /** * 定义拦截器规则 */ @Pointcut('execution(* com.test.test.api.controller.test.test.*(..))') public void pointCut() { } /** * 拦截器具体实现 * * @throws Throwable */ @Around(value = 'pointCut()') public Object around(ProceedingJoinPoint point) throws Throwable { try { HttpServletRequest request = ((ServletRequestAttributes) RequestContextHolder.getRequestAttributes()).getRequest(); //判断是否为黑名单用户 String ip = getIpAddress(request); if (checkIpBlack(ip)) { //ip在黑名单中返回false //return false; DefaultResponse defaultResponse = new DefaultResponse(); defaultResponse.setCode(-1); defaultResponse.setMessage('ip在黑名单中,拒绝访问.'); SysLogHelper.log('IpBlackAopInterceptor', '当前请求ip' + ip, 'ip在黑名单中,拒绝访问'); return defaultResponse; } else { //ip不在黑名单中返回true SysLogHelper.log('IpBlackAopInterceptor', '当前请求ip' + ip, 'ip正常,允许访问'); return point.proceed(); } } catch (Exception e) { e.printStackTrace(); SysLogHelper.error('IpBlackAopInterceptor黑名单拦截异常:', ExceptionUtils.getMessage(e) + '详细' + ExceptionUtils.getStackTrace(e), null); } return point.getArgs(); } //对比当前请求IP是否在黑名单中,注意(对比黑名单ip存放在redis中) public boolean checkIpBlack(String ip) throws Exception { IpBlackBody body = new IpBlackBody(); body = cacheHelper.get('IpBlack:ips', IpBlackBody.class); if (body != null) { for (int i = 0; i < body.getIp().length; i++) { if (body.getIp()[i].equals(ip)) return true; } } return false; }}
三·获取请求主机IP地址
public final static String getIpAddress(HttpServletRequest request) throws IOException { // 获取请求主机IP地址,如果通过代理进来,则透过防火墙获取真实IP地址 String ip = request.getHeader('x-forwarded-for'); if (ip == null || ip.length() == 0 || 'unknown'.equalsIgnoreCase(ip)) { 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.getRemoteAddr(); } } else if (ip.length() > 15) { String[] ips = ip.split(','); for (int index = 0; index < ips.length; index++) { String strIp = (String) ips[index]; if (!('unknown'.equalsIgnoreCase(strIp))) { ip = strIp; break; } } } return ip; }
四·扩展接口,实现将黑名单IP写入redis当中,并返回当前所有黑名单IP
@RestControllerpublic class IpBlackController { @Autowired(required = false) private CacheHelper cacheHelper; @PostMapping('/testIpBlack') public IpBlackBody IpBlack(@RequestBody IpBlackBody ipBlackBody) throws Exception { IpBlackBody body = new IpBlackBody(); body = cacheHelper.get('IpBlack:ips', IpBlackBody.class); if (body != null) { //拼接当前IP与redis中现有ip linkArray(body.getIp(), ipBlackBody.getIp()); //将数据赋给body body.setIp(linkArray(body.getIp(), ipBlackBody.getIp())); //setex中第二个参数时间为S,根据业务场景相应调整,此处我设置为一天 //将body中拼接后的ip地址数据写入redis中 cacheHelper.setex('IpBlack:ips', 86400, body); } else { cacheHelper.setex('IpBlack:ips', 86400, ipBlackBody); body = cacheHelper.get('IpBlack:ips', IpBlackBody.class); return body; } return body; } //拼接两个String[]的方法 public static String[] linkArray(String[] array1, String[] array2) { List<String> list = new ArrayList<>(); if (array1 == null) { return array2; } if (array2 == null) { return array1; } for (int i = 0; i < array1.length; i++) { list.add(array1[i]); } for (int i = 0; i < array2.length; i++) { list.add(array2[i]); } String[] returnValue = new String[list.size()]; for (int i = 0; i < list.size(); i++) { returnValue[i] = list.get(i); } return returnValue; }}
总结:
首先根据需要拦截的controller拦截响应请求controller层,然后根据编写相关拦截器的具体实现,其中包含两部主要操作:
1.获取到远程请求主机的实际ip地址
2.对比当前ip是否在黑名单中(此次操作需要读取redis中的黑名单ip列表)
然后根据当前需求增加了一个redis接口,实现将需要封禁的IP地址增加到redis黑名单中并返回当前所有的黑名单IP地址。
至此:至此springboot通过拦截器实现拦截黑名单功能已经实现。
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