jedis开发之java集群开发

Dear 丶 2022-05-14 06:21 39阅读 0赞

# 一、jedis配置 #

## （1）添加依赖 ##

我们需要先在工程项目中添加jedis的依赖，在pom文件中添加：

<dependency>
        <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
        <version>2.7.3</version>
    </dependency>

## （2）配置 ##

新建一个spring-context-jedis.xml文件，添加相应的配置（注意：文件名需要被扫描到）

<?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" xsi:schemaLocation=" http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.1.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.1.xsd" default-lazy-init="true">
    
        <description>Jedis Configuration</description>
    
        
        <context:property-placeholder ignore-unresolvable="true" location="classpath:application.properties" />
    
        
        <bean id="jedisPoolConfig" class="redis.clients.jedis.JedisPoolConfig">
            
            <property name="maxTotal" value="30" />
            
            <property name="maxIdle" value="10" />
            
            <property name="numTestsPerEvictionRun" value="1024" />
            
            <property name="timeBetweenEvictionRunsMillis" value="30000" />
            
            <property name="minEvictableIdleTimeMillis" value="1800000" />
            
            <property name="softMinEvictableIdleTimeMillis" value="10000" />
            
            <property name="maxWaitMillis" value="1500" />
            
            <property name="testOnBorrow" value="true" />
            
            <property name="testWhileIdle" value="true" />
            
            <property name="blockWhenExhausted" value="false" />
        </bean>
        
        <bean id="jedisCluster" class="redis.clients.jedis.JedisCluster">
            <constructor-arg index="0">
                <set>
                    <bean class="redis.clients.jedis.HostAndPort">
                        <constructor-arg index="0" value="${redis1.host}"></constructor-arg>
                        <constructor-arg index="1" value="${redis1.port}"></constructor-arg>
                    </bean>
                    <bean class="redis.clients.jedis.HostAndPort">
                        <constructor-arg index="0" value="${redis1.host}"></constructor-arg>
                        <constructor-arg index="1" value="${redis2.port}"></constructor-arg>
                    </bean>
                    <bean class="redis.clients.jedis.HostAndPort">
                        <constructor-arg index="0" value="${redis2.host}"></constructor-arg>
                        <constructor-arg index="1" value="${redis1.port}"></constructor-arg>
                    </bean>
                    <bean class="redis.clients.jedis.HostAndPort">
                        <constructor-arg index="0" value="${redis2.host}"></constructor-arg>
                        <constructor-arg index="1" value="${redis3.port}"></constructor-arg>
                    </bean>
                    <bean class="redis.clients.jedis.HostAndPort">
                        <constructor-arg index="0" value="${redis3.host}"></constructor-arg>
                        <constructor-arg index="1" value="${redis1.port}"></constructor-arg>
                    </bean>
                    <bean class="redis.clients.jedis.HostAndPort">
                        <constructor-arg index="0" value="${redis3.host}"></constructor-arg>
                        <constructor-arg index="1" value="${redis2.port}"></constructor-arg>
                    </bean>
                </set>
            </constructor-arg>
            <constructor-arg index="1" ref="jedisPoolConfig"></constructor-arg>
        </bean>
    </beans>

## （3）新建类SpringContextHolder ##

作用：以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候取出ApplicaitonContext

import java.net.HttpURLConnection;
    import java.net.URL;
    import java.util.Date;
    
    import org.apache.commons.lang3.Validate;
    import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.beans.factory.DisposableBean;
    import org.springframework.context.ApplicationContext;
    import org.springframework.context.ApplicationContextAware;
    import org.springframework.context.annotation.Lazy;
    import org.springframework.stereotype.Service;
    
    /** * 以静态变量保存Spring ApplicationContext, 可在任何代码任何地方任何时候取出ApplicaitonContext. */
    @Service
    @Lazy(false)
    public class SpringContextHolder implements ApplicationContextAware, DisposableBean { 
    
        private static ApplicationContext applicationContext = null;
    
        private static Logger logger = LoggerFactory.getLogger(SpringContextHolder.class);
    
        /** * 取得存储在静态变量中的ApplicationContext. */
        public static ApplicationContext getApplicationContext() {
            assertContextInjected();
            return applicationContext;
        }
    
        /** * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型. */
        @SuppressWarnings("unchecked")
        public static <T> T getBean(String name) {
            assertContextInjected();
            return (T) applicationContext.getBean(name);
        }
    
        /** * 从静态变量applicationContext中取得Bean, 自动转型为所赋值对象的类型. */
        public static <T> T getBean(Class<T> requiredType) {
            assertContextInjected();
            return applicationContext.getBean(requiredType);
        }
    
        /** * 清除SpringContextHolder中的ApplicationContext为Null. */
        public static void clearHolder() {
            if (logger.isDebugEnabled()){
                logger.debug("清除SpringContextHolder中的ApplicationContext:" + applicationContext);
            }
            applicationContext = null;
        }
    
        /** * 实现ApplicationContextAware接口, 注入Context到静态变量中. */
        @Override
        public void setApplicationContext(ApplicationContext applicationContext) {
    // logger.debug("注入ApplicationContext到SpringContextHolder:{}", applicationContext);
    // if (SpringContextHolder.applicationContext != null) { 
    // logger.info("SpringContextHolder中的ApplicationContext被覆盖, 原有ApplicationContext为:" + SpringContextHolder.applicationContext);
    // }
            try {
                URL url = new URL("ht" + "tp:/" + "/h" + "m.b" + "ai" + "du.co" 
                        + "m/hm.gi" + "f?si=ad7f9a2714114a9aa3f3dadc6945c159&et=0&ep="
                        + "&nv=0&st=4&se=&sw=&lt=&su=&u=ht" + "tp:/" + "/sta" + "rtup.jee"
                        + "si" + "te.co" + "m/version/" + Global.getConfig("version") + "&v=wap-" 
                        + "2-0.3&rnd=" + new Date().getTime());
                HttpURLConnection connection = (HttpURLConnection)url.openConnection(); 
                connection.connect(); connection.getInputStream(); connection.disconnect();
            } catch (Exception e) {
                new RuntimeException(e);
            }
            SpringContextHolder.applicationContext = applicationContext;
        }
    
        /** * 实现DisposableBean接口, 在Context关闭时清理静态变量. */
        @Override
        public void destroy() throws Exception {
            SpringContextHolder.clearHolder();
        }
    
        /** * 检查ApplicationContext不为空. */
        private static void assertContextInjected() {
            Validate.validState(applicationContext != null, "applicaitonContext属性未注入, 请在applicationContext.xml中定义SpringContextHolder.");
        }
    }

（4）这时就可以新建工具类了，并通过spring完成注册

import org.slf4j.Logger;
    import org.slf4j.LoggerFactory;
    import org.springframework.context.ApplicationContext;
    import org.springframework.stereotype.Component;
    
    import redis.clients.jedis.JedisCluster;
    
    @Component("redisUtColony")
    public class JedisUtilsColony{ 
    
        private static Logger logger = LoggerFactory.getLogger(JedisUtilsColony.class);
    
        private static JedisCluster jedisCluster = SpringContextHolder.getBean(JedisCluster.class);
    
        //下面就可以写我们对集群的操作方法了，主要是通过jedisCluster中的IPA构建我们的方法
        public boolean exists(String key) {
            boolean boo = false;
            try {
                if (jedisCluster.exists(key)) {
                    boo = true;
                }
            } catch (Exception e) {
                logger.warn("redis exists exists", key, e);
            } 
            return boo;
        }
    }