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SpringBoot整合Redis缓存

Java技术

一、前言

之前分享过关于Redis集群如何搭建的，最近有小伙伴儿说分享一下Redis如何使用SpringBoot的整合，项目中经常使用的就是Redis，本次整合的是Redis单机版，后续会分享Redis集群版本，请多提出自己的意见。

二、开始整合

1.首先需要搭建Redis服务器，可参考之前的博客（）

2019/04/26/Redis的搭建（win和linux版）

2.搭建SpringBoot工程，参考之前的博客

SpringBoot工程搭建

3.在pom文件加入redis的依赖和Json相关依赖

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<!-- Redis 依赖 -->
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>fastjson</artifactId>
    <version>1.2.38</version>
</dependency>

4.创建项目结构，结构如下图所示

SpringBoot整合Redis缓存 _ JavaClub全栈架构师技术笔记

5.项目全局配置文件application.properties文件配置Redis的相关配置

如下问全部的配置，因为我的redis没有设置密码，故password被我注释掉了

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#项目启动端口
server.port=8088
#应用上下文
server.context-path = /SpringBootRedis
#redis相关配置
# Redis数据库索引（默认为0）
spring.redis.database=0
# Redis服务器地址
spring.redis.host=127.0.0.1
# Redis服务器连接端口
spring.redis.port=6379
# Redis服务器连接密码（默认为空）
#spring.redis.password=
# 连接池最大连接数（使用负值表示没有限制）
spring.redis.pool.max-active=200
# 连接池最大阻塞等待时间（使用负值表示没有限制）
spring.redis.pool.max-wait=-1
# 连接池中的最大空闲连接
spring.redis.pool.max-idle=10
# 连接池中的最小空闲连接
spring.redis.pool.min-idle=0
# 连接超时时间（毫秒）
spring.redis.timeout=1000

6.配置redis的配置文件，使用RedisTemplate进行操作，需要将数据的进行序列化，才不会出现乱码

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package com.yang.config.redis;

import com.fasterxml.jackson.annotation.JsonAutoDetect;
import com.fasterxml.jackson.annotation.PropertyAccessor;
import com.fasterxml.jackson.databind.ObjectMapper;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.serializer.Jackson2JsonRedisSerializer;
import org.springframework.data.redis.serializer.StringRedisSerializer;

/**
 * Redis配置类
 */
@Configuration
public class RedisConfig {
    @Bean
    public RedisTemplate<String, Object> redisTemplate(RedisConnectionFactory factory) {
        RedisTemplate<String, Object> template = new RedisTemplate<String, Object>();
        template.setConnectionFactory(factory);
        Jackson2JsonRedisSerializer jackson2JsonRedisSerializer = new Jackson2JsonRedisSerializer(Object.class);
        ObjectMapper om = new ObjectMapper();
        om.setVisibility(PropertyAccessor.ALL, JsonAutoDetect.Visibility.ANY);
        om.enableDefaultTyping(ObjectMapper.DefaultTyping.NON_FINAL);
        jackson2JsonRedisSerializer.setObjectMapper(om);
        StringRedisSerializer stringRedisSerializer = new StringRedisSerializer();
        // key采用String的序列化方式
        template.setKeySerializer(stringRedisSerializer);
        // hash的key也采用String的序列化方式
        template.setHashKeySerializer(stringRedisSerializer);
        // value序列化方式采用jackson
        template.setValueSerializer(jackson2JsonRedisSerializer);
        // hash的value序列化方式采用jackson
        template.setHashValueSerializer(jackson2JsonRedisSerializer);
        template.afterPropertiesSet();
        return template;
    }
}

7.编写redis工具类，供开发使用，注入RedisTemplate进行操作

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package com.yang.config.redis;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.core.RedisTemplate;
import java.util.concurrent.TimeUnit;

/**
 * redis 工具，存取
 */
@Configuration
public class RedisUtil {

    @Autowired
    private RedisTemplate<String,Object> redisTemplate;

    /**
     * 存数据
     * @param key
     * @param value
     */
    public void set(String key , Object value){
        redisTemplate.opsForValue().set(key,value);
    }

    /**
     * 存数据
     * @param key 键
     * @param value 值
     * @param exp 过期时间 默认秒
     * @param s 使用 时还是分还是秒，默认秒
     */
    public void set(String key , Object value , int exp,TimeUnit s){
        if( s==null ){
            s = TimeUnit.SECONDS;
        }
        redisTemplate.opsForValue().set(key,value,exp, s);
    }

    /**
     * 获取数据
     * @param key
     * @return
     */
    public <T>T get(String key){
        return (T)redisTemplate.opsForValue().get(key);
    }

}

8.编写RedisController，编写set和get，使用请求来存储redis的值和获取redis的值

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package com.yang.controller;

import com.yang.config.redis.RedisUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/redis")
public class RedisController {

    @Autowired
    private RedisUtil redisUtil;

    /**
     * redis测试
     * @return
     */
    @GetMapping("/get")
    public String get(@RequestParam(value="key") String key){
        return redisUtil.get(key).toString();
    }
    /**
     * redis测试
     * @return
     */
    @GetMapping("/put")
    public String put(@RequestParam(value="key") String key,@RequestParam(value="value") String value){
        redisUtil.set(key,value);
        return "success";
    }
}

9.使用浏览器访问接口保存数据，并查询数据

SpringBoot整合Redis缓存 _ JavaClub全栈架构师技术笔记

SpringBoot整合Redis缓存 _ JavaClub全栈架构师技术笔记

三、加载机制剖析

1.经过查看，Redis的包中，包含RedisAutoConfiguration这个配置类，使用了Configuration注解，SpringBoot会自动加载

​ 

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//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//

package org.springframework.boot.autoconfigure.data.redis;

import java.net.URI;
import java.net.URISyntaxException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.pool2.impl.GenericObjectPool;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.boot.autoconfigure.condition.ConditionalOnClass;
import org.springframework.boot.autoconfigure.condition.ConditionalOnMissingBean;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties.Cluster;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties.Pool;
import org.springframework.boot.autoconfigure.data.redis.RedisProperties.Sentinel;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.redis.connection.RedisClusterConfiguration;
import org.springframework.data.redis.connection.RedisConnectionFactory;
import org.springframework.data.redis.connection.RedisNode;
import org.springframework.data.redis.connection.RedisSentinelConfiguration;
import org.springframework.data.redis.connection.jedis.JedisConnection;
import org.springframework.data.redis.connection.jedis.JedisConnectionFactory;
import org.springframework.data.redis.core.RedisOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.JedisPoolConfig;

@Configuration
@ConditionalOnClass({JedisConnection.class, RedisOperations.class, Jedis.class})
@EnableConfigurationProperties({RedisProperties.class})
public class RedisAutoConfiguration {
    public RedisAutoConfiguration() {
    }

    @Configuration
    protected static class RedisConfiguration {
        protected RedisConfiguration() {
        }

        @Bean
        @ConditionalOnMissingBean(
            name = {"redisTemplate"}
        )
        public RedisTemplate<Object, Object> redisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
            RedisTemplate<Object, Object> template = new RedisTemplate();
            template.setConnectionFactory(redisConnectionFactory);
            return template;
        }

        @Bean
        @ConditionalOnMissingBean({StringRedisTemplate.class})
        public StringRedisTemplate stringRedisTemplate(RedisConnectionFactory redisConnectionFactory) throws UnknownHostException {
            StringRedisTemplate template = new StringRedisTemplate();
            template.setConnectionFactory(redisConnectionFactory);
            return template;
        }
    }

    @Configuration
    @ConditionalOnClass({GenericObjectPool.class})
    protected static class RedisConnectionConfiguration {
        private final RedisProperties properties;
        private final RedisSentinelConfiguration sentinelConfiguration;
        private final RedisClusterConfiguration clusterConfiguration;

        public RedisConnectionConfiguration(RedisProperties properties, ObjectProvider<RedisSentinelConfiguration> sentinelConfiguration, ObjectProvider<RedisClusterConfiguration> clusterConfiguration) {
            this.properties = properties;
            this.sentinelConfiguration = (RedisSentinelConfiguration)sentinelConfiguration.getIfAvailable();
            this.clusterConfiguration = (RedisClusterConfiguration)clusterConfiguration.getIfAvailable();
        }

        @Bean
        @ConditionalOnMissingBean({RedisConnectionFactory.class})
        public JedisConnectionFactory redisConnectionFactory() throws UnknownHostException {
            return this.applyProperties(this.createJedisConnectionFactory());
        }

        protected final JedisConnectionFactory applyProperties(JedisConnectionFactory factory) {
            this.configureConnection(factory);
            if (this.properties.isSsl()) {
                factory.setUseSsl(true);
            }

            factory.setDatabase(this.properties.getDatabase());
            if (this.properties.getTimeout() > 0) {
                factory.setTimeout(this.properties.getTimeout());
            }

            return factory;
        }

        private void configureConnection(JedisConnectionFactory factory) {
            if (StringUtils.hasText(this.properties.getUrl())) {
                this.configureConnectionFromUrl(factory);
            } else {
                factory.setHostName(this.properties.getHost());
                factory.setPort(this.properties.getPort());
                if (this.properties.getPassword() != null) {
                    factory.setPassword(this.properties.getPassword());
                }
            }

        }

        private void configureConnectionFromUrl(JedisConnectionFactory factory) {
            String url = this.properties.getUrl();
            if (url.startsWith("rediss://")) {
                factory.setUseSsl(true);
            }

            try {
                URI uri = new URI(url);
                factory.setHostName(uri.getHost());
                factory.setPort(uri.getPort());
                if (uri.getUserInfo() != null) {
                    String password = uri.getUserInfo();
                    int index = password.lastIndexOf(":");
                    if (index >= 0) {
                        password = password.substring(index + 1);
                    }

                    factory.setPassword(password);
                }

            } catch (URISyntaxException var6) {
                throw new IllegalArgumentException("Malformed 'spring.redis.url' " + url, var6);
            }
        }

        protected final RedisSentinelConfiguration getSentinelConfig() {
            if (this.sentinelConfiguration != null) {
                return this.sentinelConfiguration;
            } else {
                Sentinel sentinelProperties = this.properties.getSentinel();
                if (sentinelProperties != null) {
                    RedisSentinelConfiguration config = new RedisSentinelConfiguration();
                    config.master(sentinelProperties.getMaster());
                    config.setSentinels(this.createSentinels(sentinelProperties));
                    return config;
                } else {
                    return null;
                }
            }
        }

        protected final RedisClusterConfiguration getClusterConfiguration() {
            if (this.clusterConfiguration != null) {
                return this.clusterConfiguration;
            } else if (this.properties.getCluster() == null) {
                return null;
            } else {
                Cluster clusterProperties = this.properties.getCluster();
                RedisClusterConfiguration config = new RedisClusterConfiguration(clusterProperties.getNodes());
                if (clusterProperties.getMaxRedirects() != null) {
                    config.setMaxRedirects(clusterProperties.getMaxRedirects().intValue());
                }

                return config;
            }
        }

        private List<RedisNode> createSentinels(Sentinel sentinel) {
            List<RedisNode> nodes = new ArrayList();
            String[] var3 = StringUtils.commaDelimitedListToStringArray(sentinel.getNodes());
            int var4 = var3.length;

            for(int var5 = 0; var5 < var4; ++var5) {
                String node = var3[var5];

                try {
                    String[] parts = StringUtils.split(node, ":");
                    Assert.state(parts.length == 2, "Must be defined as 'host:port'");
                    nodes.add(new RedisNode(parts[0], Integer.valueOf(parts[1]).intValue()));
                } catch (RuntimeException var8) {
                    throw new IllegalStateException("Invalid redis sentinel property '" + node + "'", var8);
                }
            }

            return nodes;
        }

        private JedisConnectionFactory createJedisConnectionFactory() {
            JedisPoolConfig poolConfig = this.properties.getPool() != null ? this.jedisPoolConfig() : new JedisPoolConfig();
            if (this.getSentinelConfig() != null) {
                return new JedisConnectionFactory(this.getSentinelConfig(), poolConfig);
            } else {
                return this.getClusterConfiguration() != null ? new JedisConnectionFactory(this.getClusterConfiguration(), poolConfig) : new JedisConnectionFactory(poolConfig);
            }
        }

        private JedisPoolConfig jedisPoolConfig() {
            JedisPoolConfig config = new JedisPoolConfig();
            Pool props = this.properties.getPool();
            config.setMaxTotal(props.getMaxActive());
            config.setMaxIdle(props.getMaxIdle());
            config.setMinIdle(props.getMinIdle());
            config.setMaxWaitMillis((long)props.getMaxWait());
            return config;
        }
    }
}

2.配置了EnableConfigurationProperties，配置了RedisProperties，而RedisProperties则使用了ConfigurationProperties，加载了前缀为spring.redis的所有配置，故读取了application.properties文件中的内容。

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/*
 * Copyright 2012-2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.boot.autoconfigure.data.redis;

import java.util.List;

import org.springframework.boot.context.properties.ConfigurationProperties;

/**
 * Configuration properties for Redis.
 *
 * @author Dave Syer
 * @author Christoph Strobl
 * @author Eddú Meléndez
 * @author Marco Aust
 */
@ConfigurationProperties(prefix = "spring.redis")
public class RedisProperties {

	/**
	 * Database index used by the connection factory.
	 */
	private int database = 0;

	/**
	 * Redis url, which will overrule host, port and password if set.
	 */
	private String url;

	/**
	 * Redis server host.
	 */
	private String host = "localhost";

	/**
	 * Login password of the redis server.
	 */
	private String password;

	/**
	 * Redis server port.
	 */
	private int port = 6379;

	/**
	 * Enable SSL.
	 */
	private boolean ssl;

	/**
	 * Connection timeout in milliseconds.
	 */
	private int timeout;

	private Pool pool;

	private Sentinel sentinel;

	private Cluster cluster;

	public int getDatabase() {
		return this.database;
	}

	public void setDatabase(int database) {
		this.database = database;
	}

	public String getUrl() {
		return this.url;
	}

	public void setUrl(String url) {
		this.url = url;
	}

	public String getHost() {
		return this.host;
	}

	public void setHost(String host) {
		this.host = host;
	}

	public String getPassword() {
		return this.password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public int getPort() {
		return this.port;
	}

	public void setPort(int port) {
		this.port = port;
	}

	public boolean isSsl() {
		return this.ssl;
	}

	public void setSsl(boolean ssl) {
		this.ssl = ssl;
	}

	public void setTimeout(int timeout) {
		this.timeout = timeout;
	}

	public int getTimeout() {
		return this.timeout;
	}

	public Sentinel getSentinel() {
		return this.sentinel;
	}

	public void setSentinel(Sentinel sentinel) {
		this.sentinel = sentinel;
	}

	public Pool getPool() {
		return this.pool;
	}

	public void setPool(Pool pool) {
		this.pool = pool;
	}

	public Cluster getCluster() {
		return this.cluster;
	}

	public void setCluster(Cluster cluster) {
		this.cluster = cluster;
	}

	/**
	 * Pool properties.
	 */
	public static class Pool {

		/**
		 * Max number of "idle" connections in the pool. Use a negative value to indicate
		 * an unlimited number of idle connections.
		 */
		private int maxIdle = 8;

		/**
		 * Target for the minimum number of idle connections to maintain in the pool. This
		 * setting only has an effect if it is positive.
		 */
		private int minIdle = 0;

		/**
		 * Max number of connections that can be allocated by the pool at a given time.
		 * Use a negative value for no limit.
		 */
		private int maxActive = 8;

		/**
		 * Maximum amount of time (in milliseconds) a connection allocation should block
		 * before throwing an exception when the pool is exhausted. Use a negative value
		 * to block indefinitely.
		 */
		private int maxWait = -1;

		public int getMaxIdle() {
			return this.maxIdle;
		}

		public void setMaxIdle(int maxIdle) {
			this.maxIdle = maxIdle;
		}

		public int getMinIdle() {
			return this.minIdle;
		}

		public void setMinIdle(int minIdle) {
			this.minIdle = minIdle;
		}

		public int getMaxActive() {
			return this.maxActive;
		}

		public void setMaxActive(int maxActive) {
			this.maxActive = maxActive;
		}

		public int getMaxWait() {
			return this.maxWait;
		}

		public void setMaxWait(int maxWait) {
			this.maxWait = maxWait;
		}

	}

	/**
	 * Cluster properties.
	 */
	public static class Cluster {

		/**
		 * Comma-separated list of "host:port" pairs to bootstrap from. This represents an
		 * "initial" list of cluster nodes and is required to have at least one entry.
		 */
		private List<String> nodes;

		/**
		 * Maximum number of redirects to follow when executing commands across the
		 * cluster.
		 */
		private Integer maxRedirects;

		public List<String> getNodes() {
			return this.nodes;
		}

		public void setNodes(List<String> nodes) {
			this.nodes = nodes;
		}

		public Integer getMaxRedirects() {
			return this.maxRedirects;
		}

		public void setMaxRedirects(Integer maxRedirects) {
			this.maxRedirects = maxRedirects;
		}

	}

	/**
	 * Redis sentinel properties.
	 */
	public static class Sentinel {

		/**
		 * Name of Redis server.
		 */
		private String master;

		/**
		 * Comma-separated list of host:port pairs.
		 */
		private String nodes;

		public String getMaster() {
			return this.master;
		}

		public void setMaster(String master) {
			this.master = master;
		}

		public String getNodes() {
			return this.nodes;
		}

		public void setNodes(String nodes) {
			this.nodes = nodes;
		}

	}

}

四、源码地址

点我查看

作者：Java小白_Mr.Yang
来源链接： http://www.it-online.cn/2019/08/22/SpringBoot%E6%95%B4%E5%90%88Redis/


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