jedis开发之java集群开发

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.clientsgroupId>
    <artifactId>jedisartifactId>
    <version>2.7.3version>
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）

<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 Configurationdescription>

    
    <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 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 getBean(Class 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=<=&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;
    }
}