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
**/
@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
* @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
@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；
@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。
——EOF——
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