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：
/** * @package: com.technicalinterest.group.interceptor * @className: IpUrlLimitInterceptor * @description: ip+url重复请求现在拦截器 **/@Slf4jpublic 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 * @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 * @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:
/** * @package: com.shuyu.blog.util * @className: RedisUtil **/@Component@Slf4jpublic 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；
@Configuration@Slf4jpublic 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。
来源：blog.csdn.net/wang_shuyu/article/
details/102531940
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