SpringBoot实战(七)之与Redis进行消息传递

此次教程演示安装的是Window版的Redis,

Linux安装Redis可以参考我的这篇博文:Redis的安装和客户端使用注意事项

关于Java连接Redis操作方面可以参考我的这篇博文:Java连接Redis之redis的增删改查

window安装Redis非常简单，就是下载+解压，启动服务端和客户端即可。

我是参考菜鸟教程的:http://www.runoob.com/redis/redis-install.html

包括，大家想熟悉和练练手，大家可以参考菜鸟教程，非常基础，也十分有利于提高学习信心和积极性的。

至于为什么使用Redis?

简单的说，如果我有上亿的数据，这些数据基本变动不大，如果我通过数据库加索引查询，是需要一定的时间的，如果我通过Redis将其缓存，那么通常是先缓存再数据库，意思是，如果缓存有，就不必查数据库了，要知道将数据缓存到内存中，通常cpu是直接跟内存进行交互，cpu+内存，这样会很大提升查询效率和速度的。而磁盘的话，就相对于慢的非常多。

这也是Redis一个应用场景之一。

就不多说基础方面的了，来一波示例讲解:

一、导入依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    modelVersion>4.0.0</>

    groupId>org.springframeworkartifactId>gs-messaging-redisversion>0.1.0parent>
        >org.springframework.boot>spring-boot-starter-parent>1.5.8.RELEASEpropertiesjava.version>1.8java.versiondependenciesdependency>
            >spring-boot-starter>spring-boot-starter-data-redis>


    buildpluginsplugin>
                >spring-boot-maven-pluginrepositoriesrepositoryid>spring-releasesname>Spring Releasesurl>https://repo.spring.io/libs-releasepluginRepositoriespluginRepository>
project>

二、编写消息接收类

package hello;

import java.util.concurrent.CountDownLatch;

 org.slf4j.Logger;
 org.slf4j.LoggerFactory;
 org.springframework.beans.factory.annotation.Autowired;

public class Receiver {
    private static final Logger LOGGER = LoggerFactory.getLogger(Receiver.);

    private CountDownLatch latch;

    @Autowired
    public Receiver(CountDownLatch latch) {
        this.latch = latch;
    }

    void receiveMessage(String message) {
        LOGGER.info("Received <" + message + ">");
        latch.countDown();
    }
}

三、编写配置文件

# Redis\u6570\u636E\u5E93\u7D22\u5F15\uFF08\u9ED8\u8BA4\u4E3A0\uFF09
spring.redis.database=0
# Redis\u670D\u52A1\u5668\u5730\u5740
spring.redis.host=localhost
# Redis\u670D\u52A1\u5668\u8FDE\u63A5\u7AEF\u53E3
spring.redis.port=6379
# Redis\u670D\u52A1\u5668\u8FDE\u63A5\u5BC6\u7801\uFF08\u9ED8\u8BA4\u4E3A\u7A7A\uFF09
spring.redis.password=
# \u8FDE\u63A5\u6C60\u6700\u5927\u8FDE\u63A5\u6570\uFF08\u4F7F\u7528\u8D1F\u503C\u8868\u793A\u6CA1\u6709\u9650\u5236\uFF09
spring.redis.pool.max-active=8
# \u8FDE\u63A5\u6C60\u6700\u5927\u963B\u585E\u7B49\u5F85\u65F6\u95F4\uFF08\u4F7F\u7528\u8D1F\u503C\u8868\u793A\u6CA1\u6709\u9650\u5236\uFF09
spring.redis.pool.max-wait=-1
# \u8FDE\u63A5\u6C60\u4E2D\u7684\u6700\u5927\u7A7A\u95F2\u8FDE\u63A5
spring.redis.pool.max-idle=8
# \u8FDE\u63A5\u6C60\u4E2D\u7684\u6700\u5C0F\u7A7A\u95F2\u8FDE\u63A5
spring.redis.pool.min-idle=0
# \u8FDE\u63A5\u8D85\u65F6\u65F6\u95F4\uFF08\u6BEB\u79D2\uFF09
spring.redis.timeout=0

四、编写启动类

 org.springframework.boot.SpringApplication;
 org.springframework.boot.autoconfigure.SpringBootApplication;
 org.springframework.context.ApplicationContext;
 org.springframework.context.annotation.Bean;
 org.springframework.data.redis.connection.RedisConnectionFactory;
 org.springframework.data.redis.core.StringRedisTemplate;
 org.springframework.data.redis.listener.PatternTopic;
 org.springframework.data.redis.listener.RedisMessageListenerContainer;
 org.springframework.data.redis.listener.adapter.MessageListenerAdapter;

@SpringBootApplication
 Application {

    final Logger LOGGER = LoggerFactory.getLogger(Application.);

    @Bean
    RedisMessageListenerContainer container(RedisConnectionFactory connectionFactory,MessageListenerAdapter listenerAdapter) {

        RedisMessageListenerContainer container = new RedisMessageListenerContainer();
        container.setConnectionFactory(connectionFactory);
        container.addMessageListener(listenerAdapter,new PatternTopic("chat"));

        return container;
    }

    @Bean
    MessageListenerAdapter listenerAdapter(Receiver receiver) {
        return new MessageListenerAdapter(receiver,"receiveMessage");
    }

    @Bean
    Receiver receiver(CountDownLatch latch) {
         Receiver(latch);
    }

    @Bean
    CountDownLatch latch() {
        new CountDownLatch(1);
    }

    @Bean
    StringRedisTemplate template(RedisConnectionFactory connectionFactory) {
         StringRedisTemplate(connectionFactory);
    }

    void main(String[] args) throws InterruptedException {

        ApplicationContext ctx = SpringApplication.run(Application.,args);

        StringRedisTemplate template = ctx.getBean(StringRedisTemplate.);
        CountDownLatch latch = ctx.getBean(CountDownLatch.);

        LOGGER.info("Sending message...");
        template.convertAndSend("chat","Hello from Redis!");

        latch.await();

        System.exit(0);
    }
}

成功标志:

@H_44_301@

SpringBoot实战(七)之与Redis进行消息传递

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