java中如何实现redis限流操作

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具体操作如下。

导入所需依赖

<properties>    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>    <Maven.compiler.source>1.8</maven.compiler.source>    <maven.compiler.target>1.8</maven.compiler.target>    <spring.version>5.0.2.RELEASE</spring.version>    <slf4j.version>1.6.6</slf4j.version>    <log4j.version>1.2.12</log4j.version>    <mysql.version>5.1.6</Mysql.version>    <mybatis.version>3.4.5</mybatis.version>  </properties>  <dependencies>    <dependency>      <groupId>org.aspectj</groupId>      <artifactId>aspectjweaver</artifactId>      <version>1.6.8</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-aop</artifactId>      <version>${spring.version}</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-context</artifactId>      <version>${spring.version}</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-WEB</artifactId>      <version>${spring.version}</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-webmvc</artifactId>      <version>${spring.version}</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-test</artifactId>      <version>${spring.version}</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-tx</artifactId>      <version>${spring.version}</version>    </dependency>    <dependency>      <groupId>org.springframework</groupId>      <artifactId>spring-jdbc</artifactId>      <version>${spring.version}</version>    </dependency>    <dependency>      <groupId>junit</groupId>      <artifactId>junit</artifactId>      <version>4.12</version>      <scope>compile</scope>    </dependency>    <dependency>      <groupId>mysql</groupId>      <artifactId>mysql-connector-java</artifactId>      <version>${mysql.version}</version>    </dependency>    <dependency>      <groupId>javax.servlet</groupId>      <artifactId>servlet-api</artifactId>      <version>2.5</version>      <scope>provided</scope>    </dependency>    <dependency>      <groupId>javax.servlet.jsp</groupId>      <artifactId>jsp-api</artifactId>      <version>2.0</version>      <scope>provided</scope>    </dependency>    <dependency>      <groupId>jstl</groupId>      <artifactId>jstl</artifactId>      <version>1.2</version>    </dependency>    <!-- log start -->    <dependency>      <groupId>log4j</groupId>      <artifactId>log4j</artifactId>      <version>${log4j.version}</version>    </dependency>    <dependency>      <groupId>org.slf4j</groupId>      <artifactId>slf4j-api</artifactId>      <version>${slf4j.version}</version>    </dependency>    <dependency>      <groupId>org.slf4j</groupId>      <artifactId>slf4j-log4j12</artifactId>      <version>${slf4j.version}</version>    </dependency>    <!-- log end -->    <dependency>      <groupId>org.mybatis</groupId>      <artifactId>mybatis</artifactId>      <version>${mybatis.version}</version>    </dependency>    <dependency>      <groupId>org.mybatis</groupId>      <artifactId>mybatis-spring</artifactId>      <version>1.3.0</version>    </dependency>    <dependency>      <groupId>c3p0</groupId>      <artifactId>c3p0</artifactId>      <version>0.9.1.2</version>      <type>jar</type>      <scope>compile</scope>    </dependency>    <dependency>      <groupId>org.springframework.data</groupId>      <artifactId>spring-data-Redis</artifactId>      <version>1.7.2.RELEASE</version>    </dependency>    <dependency>      <groupId>redis.clients</groupId>      <artifactId>jedis</artifactId>      <version>2.8.1</version>    </dependency></dependencies>

编写注解

@Retention(RUNTIME)//运行时有效@Target(ElementType.METHOD)//用在方法上 public @interface AccessLimit {     int seconds();//时间范围(单位:秒)     int maxCount();//在这个时间范围内最大访问次数 }

编写拦截器

public class AcessLimiitInterceptor implements HandlerInterceptor { //注入redisTemplate    @Autowired    private RedisTemplate<String,String> redisTemplate;    @Override    public boolean preHandle(httpservletRequest request, HttpServletResponse response, Object handler) {     //设置redisTemplate的序列化方式(必须设置为这种方式，因为要用到incr)        redisTemplate.seTKEySerializer(new StringRedisSerializer());        redisTemplate.setValueSerializer(new StringRedisSerializer());               if(handler instanceof HandlerMethod){         //查看该方法上是否有@AcessLimit注解            HandlerMethod hm= (HandlerMethod) handler;            AccessLimit accessLimit=hm.getMethodAnnotation(AccessLimit.class);            //没有@AcessLimit注解，证明无限流操作，直接放行            if(accessLimit==null){                return true;            }             //获取注解的参数值            int seconds=accessLimit.seconds();//时间范围            int maxCount=accessLimit.maxCount();//时间范围内的最大访问次数            //该请求的路径            String key=request.getRequestURI();            //在该时间范围内已经访问的次数            String countStr=redisTemplate.opsForValue().get(key);            Integer count=null;            //如果不是第一次访问，则把访问次数转换为integer类型            if(countStr!=null){                count= Integer.valueOf(redisTemplate.opsForValue().get(key));            }   //拿到访问次数的过期时间            Long keySeconds=redisTemplate.getExpire(key);            //该时间范围内没有访问            if(count==null){             //第一次访问，设置key为访问路径，值为访问次数1                redisTemplate.opsForValue().set(key,1+"");                //设置过期时间                redisTemplate.expire(key,600, TimeUnit.SECONDS);            }else if(count<maxCount){//在该时间范围内已经有访问记录，但访问没有达到最大次数             //访问次数+1                redisTemplate.opsForValue().increment(key,1);                //设置剩余过期时间(修改完该key的value值后，对应的过期时间会失效，需重新设置)                redisTemplate.expire(key,keySeconds, TimeUnit.SECONDS);            }else{//在该时间范围内已经超过最大的访问次数                return false;            }        }        //放行        return true;    }}

编写application.xml

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"       xmlns:context="http://www.springframework.org/schema/context"       xmlns:aop="http://www.springframework.org/schema/aop"       xmlns:tx="http://www.springframework.org/schema/tx"       xmlns:p="http://www.springframework.org/schema/p"       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">    <!--开启注解的扫描，希望处理service和dao，controller不需要Spring框架去处理-->    <context:component-scan base-package="cn.itcast" >        <!--配置哪些注解不扫描-->        <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller" />    </context:component-scan>    <!--Spring整合MyBatis框架-->    <!--配置连接池-->    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">        <property name="driverClass" value="com.mysql.jdbc.Driver"/>        <property name="jdbcUrl" value="jdbc:mysql:///SSM"/>        <property name="user" value="root"/>        <property name="passWord" value="root"/>    </bean>    <!--配置SqlSessionFactory工厂-->    <bean id="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean">        <property name="dataSource" ref="dataSource" />    </bean>    <!--配置AccountDao接口所在包-->    <bean id="mapperScanner" class="org.mybatis.spring.mapper.MapperScannerConfigurer">        <property name="basePackage" value="cn.itcast.dao"/>    </bean>    <!--配置Spring框架声明式事务管理-->    <!--配置事务管理器-->    <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">        <property name="dataSource" ref="dataSource" />    </bean>    <!--配置事务通知-->    <tx:advice id="txAdvice" transaction-manager="transactionManager">        <tx:attributes>            <tx:method name="find*" read-only="true"/>            <tx:method name="*" isolation="DEFAULT"/>        </tx:attributes>    </tx:advice>    <!--配置AOP增强-->    <aop:config>        <aop:advisor advice-ref="txAdvice" pointcut="execution(* cn.itcast.service.impl.*ServiceImpl.*(..))"/>    </aop:config>    <context:property-placeholder location="classpath*:*.properties"></context:property-placeholder>    <!-- <context:property-placeholder location="classpath*:properties/*.properties" />   -->    <!-- redis 相关配置 -->    <bean id="poolConfig" class="redis.clients.jedis.JedisPoolConfig">        <property name="maxIdle" value="${redis.maxIdle}" />        <property name="maxWaitMillis" value="${redis.maxWait}" />        <property name="testOnBorrow" value="${redis.testOnBorrow}" />    </bean>        <bean id="JedisConnectionFactory" class="org.springframework.data.redis.connection.jedis.JedisConnectionFactory"          p:host-name="${redis.host}" p:port="${redis.port}" p:password="${redis.pass}" p:pool-config-ref="poolConfig"/>    <bean id="redisTemplate" class="org.springframework.data.redis.core.RedisTemplate">        <property name="connectionFactory" ref="JedisConnectionFactory" />    </bean>    </beans>

配置web.xml

<web-app>  <display-name>Archetype Created Web Application</display-name>  <!--配置Spring的监听器，默认只加载WEB-INF目录下的applicationContext.xml配置文件-->  <listener>    <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>  </listener>  <!--设置配置文件的路径-->  <context-param>    <param-name>contextConfigLocation</param-name>    <param-value>classpath:applicationContext.xml</param-value>  </context-param>  <!--配置前端控制器-->  <servlet>    <servlet-name>dispatcherServlet</servlet-name>    <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class>    <!--加载springMVC.xml配置文件-->    <init-param>      <param-name>contextConfigLocation</param-name>      <param-value>classpath:springmvc.xml</param-value>    </init-param>    <!--启动服务器，创建该servlet-->    <load-on-startup>1</load-on-startup>  </servlet>  <servlet-mapping>    <servlet-name>dispatcherServlet</servlet-name>    <url-pattern>/</url-pattern>  </servlet-mapping>  <!--解决中文乱码的过滤器-->  <filter>    <filter-name>characterEncodingFilter</filter-name>    <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class>    <init-param>      <param-name>encoding</param-name>      <param-value>UTF-8</param-value>    </init-param>  </filter>  <filter-mapping>    <filter-name>characterEncodingFilter</filter-name>    <url-pattern>/*</url-pattern>  </filter-mapping>  </web-app>

注解应用

@AccessLimit(seconds = 500,maxCount = 3)    @RequestMapping(value = "/findAll")    public String findAll(Model model){        System.out.println("csl");        return "list";    }

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