0.參考鏈接
1.使用redis計數來控制單位時間內對某接口的訪問量,防止刷驗證碼接口之類的
http://m.blog.csdn.net/tianyaleixiaowu/article/details/74549145
2.征服Redis+Jedis+Spring
http://snowolf.iteye.com/blog/1824868/
1.業務需求
限制接口在單位時間內被訪問的次數
2.技術點
1.Redis
2.Spring整合redis(SpringData Jedis)
3.AOP(環繞通知)
4.自定義註解
3.Redis的安裝配置
暫略
4.Spring整合redis
注:配置文件中各部分含義待補充
0.涉及jar
commons-pool2-2.4.2.jar
jedis-2.9.0.jar
spring-data-commons-1.13.6.RELEASE.jar
spring-data-redis-1.6.2.RELEASE.jar
注意:各個jar包版本不匹配可能引起異常
1.Spring xml配置
<context:property-placeholder location="classpath:redis.properties" />
<bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig"
p:maxIdle="${redis.maxIdle}" p:maxTotal="${redis.maxTotal}"
p:maxWaitMillis="${redis.maxWaitMillis}" p:testOnBorrow="${redis.testOnBorrow}" />
<bean id="jedisConnFactory"
class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"
p:hostName="${redis.host}" p:port="${redis.port}" p:password="${redis.pass}"
p:pool-config-ref="poolConfig" p:use-pool="false" />
<bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate"
p:connection-factory-ref="jedisConnFactory" />
2.redis.properties
redis.host=127.0.0.1
redis.port=6379
redis.pass=123456
redis.maxIdle=300
redis.maxTotal=600
redis.maxWaitMillis=1000
redis.testOnBorrow=true
5.AOP(環繞通知)中結合自定義註解使用Redis
1.如何建立一個aop切面類?
詳見 Java->4.配置->5.AOP
2.創建自定義註解RequestLimit
import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import org.springframework.core.Ordered;
import org.springframework.core.annotation.Order;
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
@Documented
@Order(Ordered.HIGHEST_PRECEDENCE)
public @interface RequestLimit {
/**
* 規定時間內的限制請求次數 (默認爲5)
*
*/
int count() default 5;
/**
* 單位時間(默認爲60)
*/
int time() default 60;
}
3.在要限流的接口上加上註解@RequestLimit
@RequestLimit(count=3,time=30)
@RequestMapping(value = "/QueryInclusiveFinanceData",
method = RequestMethod.POST, produces = "application/json;charset=UTF-8")
@ResponseBody
public String queryInclFina(@RequestParam("userName") userName) throws Exception {
return result;
}
4.環繞通知給接口限流
@Resource
private RedisTemplate<Serializable, Serializable> redisTemplate;
@Pointcut("execution(* com.phfinancial.controller.InclusiveFinanceApiController.queryInclFina(..)) ")
public void aspectPointcut() { }
@Around(value = "aspectPointcut() && @annotation(requestLimit)")
public Object aroundInclFinaController(ProceedingJoinPoint jp,RequestLimit requestLimit) throws Throwable {
Object[] args = jp.getArgs();
String userName = (String) args[0];
RedisSerializer<String> strSer = redisTemplate.getStringSerializer();
byte[] userNameSer = strSer.serialize(userName);
Long count = redisTemplate.opsForValue().increment(userNameSer, 1);
if (count==1) {
redisTemplate.expire(userNameSer, requestLimit.time(), TimeUnit.SECONDS);
}
if (count<=requestLimit.count()) {
return jp.proceed();
}
return ResultJson.errCode("5001", "限流控制");
}
6.達到效果
(設定如上)
序號 訪問時間 是否成功調取接口 錯誤碼
1 00:00:00 是 無
2 00:00:11 是 無
3 00:00:18 是 無
4 00:00:21 否 5001
5 00:00:27 否 5001
6 00:00:32 是 無