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
@Component
public 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
@RestController
public 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。
