在实际项目使用中,必须要考虑服务的安全性,当服务部署到互联网以后,就要考虑服务被恶意请求和暴力攻击的情况,下面的教程,通过intercept和redis针对url+ip在一定时间内访问的次数来将ip禁用,可以根据自己的需求进行相应的修改,来打打自己的目的;
首先工程为springboot框架搭建,不再详细叙述。直接上核心代码。
首先创建一个自定义的拦截器类,也是最核心的代码;
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/** * @package: com.technicalinterest.group.interceptor * @className: IpUrlLimitInterceptor * @description: ip+url重复请求现在拦截器 * @author: Shuyu.Wang * @date: 2019-10-12 12:34 * @since: 0.1 **/ @Slf4j public class IpUrlLimitInterceptor implements HandlerInterceptor { private RedisUtil getRedisUtil() { return SpringContextUtil.getBean(RedisUtil. class ); } private static final String LOCK_IP_URL_KEY= "lock_ip_" ; private static final String IP_URL_REQ_TIME= "ip_url_times_" ; private static final long LIMIT_TIMES= 5 ; private static final int IP_LOCK_TIME= 60 ; @Override public boolean preHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o) throws Exception { log.info( "request请求地址uri={},ip={}" , httpServletRequest.getRequestURI(), IpAdrressUtil.getIpAdrress(httpServletRequest)); if (ipIsLock(IpAdrressUtil.getIpAdrress(httpServletRequest))){ log.info( "ip访问被禁止={}" ,IpAdrressUtil.getIpAdrress(httpServletRequest)); ApiResult result = new ApiResult(ResultEnum.LOCK_IP); returnJson(httpServletResponse, JSON.toJSONString(result)); return false ; } if (!addRequestTime(IpAdrressUtil.getIpAdrress(httpServletRequest),httpServletRequest.getRequestURI())){ ApiResult result = new ApiResult(ResultEnum.LOCK_IP); returnJson(httpServletResponse, JSON.toJSONString(result)); return false ; } return true ; } @Override public void postHandle(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, ModelAndView modelAndView) throws Exception { } @Override public void afterCompletion(HttpServletRequest httpServletRequest, HttpServletResponse httpServletResponse, Object o, Exception e) throws Exception { } /** * @Description: 判断ip是否被禁用 * @author: shuyu.wang * @date: 2019-10-12 13:08 * @param ip * @return java.lang.Boolean */ private Boolean ipIsLock(String ip){ RedisUtil redisUtil=getRedisUtil(); if (redisUtil.hasKey(LOCK_IP_URL_KEY+ip)){ return true ; } return false ; } /** * @Description: 记录请求次数 * @author: shuyu.wang * @date: 2019-10-12 17:18 * @param ip * @param uri * @return java.lang.Boolean */ private Boolean addRequestTime(String ip,String uri){ String key=IP_URL_REQ_TIME+ip+uri; RedisUtil redisUtil=getRedisUtil(); if (redisUtil.hasKey(key)){ long time=redisUtil.incr(key,( long ) 1 ); if (time>=LIMIT_TIMES){ redisUtil.getLock(LOCK_IP_URL_KEY+ip,ip,IP_LOCK_TIME); return false ; } } else { redisUtil.getLock(key,( long ) 1 , 1 ); } return true ; } private void returnJson(HttpServletResponse response, String json) throws Exception { PrintWriter writer = null ; response.setCharacterEncoding( "UTF-8" ); response.setContentType( "text/json; charset=utf-8" ); try { writer = response.getWriter(); writer.print(json); } catch (IOException e) { log.error( "LoginInterceptor response error ---> {}" , e.getMessage(), e); } finally { if (writer != null ) { writer.close(); } } } } |
代码中redis的使用的是分布式锁的形式,这样可以最大程度保证线程安全和功能的实现效果。代码中设置的是1S内同一个接口通过同一个ip访问5次,就将该ip禁用1个小时,根据自己项目需求可以自己适当修改,实现自己想要的功能;
redis分布式锁的关键代码:
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/** * @package: com.shuyu.blog.util * @className: RedisUtil * @description: * @author: Shuyu.Wang * @date: 2019-07-14 14:42 * @since: 0.1 **/ @Component @Slf4j public class RedisUtil { private static final Long SUCCESS = 1L; @Autowired private RedisTemplate<String, Object> redisTemplate; // =============================common============================ /** * 获取锁 * @param lockKey * @param value * @param expireTime:单位-秒 * @return */ public boolean getLock(String lockKey, Object value, int expireTime) { try { log.info( "添加分布式锁key={},expireTime={}" ,lockKey,expireTime); String script = "if redis.call('setNx',KEYS[1],ARGV[1]) then if redis.call('get',KEYS[1])==ARGV[1] then return redis.call('expire',KEYS[1],ARGV[2]) else return 0 end end" ; RedisScript<String> redisScript = new DefaultRedisScript<>(script, String. class ); Object result = redisTemplate.execute(redisScript, Collections.singletonList(lockKey), value, expireTime); if (SUCCESS.equals(result)) { return true ; } } catch (Exception e) { e.printStackTrace(); } return false ; } /** * 释放锁 * @param lockKey * @param value * @return */ public boolean releaseLock(String lockKey, String value) { String script = "if redis.call('get', KEYS[1]) == ARGV[1] then return redis.call('del', KEYS[1]) else return 0 end" ; RedisScript<String> redisScript = new DefaultRedisScript<>(script, String. class ); Object result = redisTemplate.execute(redisScript, Collections.singletonList(lockKey), value); if (SUCCESS.equals(result)) { return true ; } return false ; } } |
最后将上面自定义的拦截器通过registry.addInterceptor添加一下,就生效了;
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@Configuration @Slf4j public class MyWebAppConfig extends WebMvcConfigurerAdapter { @Bean IpUrlLimitInterceptor getIpUrlLimitInterceptor(){ return new IpUrlLimitInterceptor(); } @Override public void addInterceptors(InterceptorRegistry registry) { registry.addInterceptor(getIpUrlLimitInterceptor()).addPathPatterns( "/**" ); super .addInterceptors(registry); } } |
自己可以写一个for循环来测试方面的功能,这里就不详细介绍了;
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原文链接:https://blog.csdn.net/wang_shuyu/article/details/102531940