SpringCloud使用redis做数据缓存。

1.Docer ToolBox安装redis

生产环境建议redis安装在linux下，这里是为了演示。（性能问题）

docker pull redis

运行redis

docker run -d -p 6379:6379 --name redis --restart=always --privileged=true redis

查看redis版本

docker exec -it redis redis-server -v

进入redis内部

docker exec -it redis /bin/bash

无密码

redis-cli

有密码的情况
auth 你设置的redis密码

2.创建springcloud应用

老方法直接先拷贝一下，前面章节的服务提供者。
pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.3.0.RELEASE</version>
		<relativePath /> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.lac</groupId>
	<artifactId>redis-cache</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>redis-cache</name>
	<description>Demo project for Spring Boot</description>

	<properties>
		<java.version>1.8</java.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter</artifactId>
		</dependency>
		<!-- https://mvnrepository.com/artifact/com.alibaba.cloud/spring-cloud-starter-alibaba-nacos-discovery -->
		<dependency>
			<groupId>com.alibaba.cloud</groupId>
			<artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId>
			<version>2.2.1.RELEASE</version>
		</dependency>
		<!-- https://mvnrepository.com/artifact/redis.clients/jedis -->
		<dependency>
			<groupId>redis.clients</groupId>
			<artifactId>jedis</artifactId>
			</dependency>
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-redis</artifactId>
        </dependency>
		<!-- https://mvnrepository.com/artifact/com.alibaba/fastjson -->
		<dependency>
			<groupId>com.alibaba</groupId>
			<artifactId>fastjson</artifactId>
			<version>1.2.68</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
			<exclusions>
				<exclusion>
					<groupId>org.junit.vintage</groupId>
					<artifactId>junit-vintage-engine</artifactId>
				</exclusion>
			</exclusions>
		</dependency>
	</dependencies>
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework.cloud</groupId>
				<artifactId>spring-cloud-dependencies</artifactId>
				<version>Hoxton.SR5</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>

</project>

redis-cache
0.0.1-SNAPSHOT
redis-cache
先把前面服务提供者的这两项改掉。
然后添加
		
		redis.clients
		jedis
		
    
        org.springframework.data
        spring-data-redis
    
    两个依赖。

---

然后 application.yml配置redis连接信息。

spring:
  application:
    name: redis-cache
  cloud:
    nacos:
      discovery:
        server-addr: 192.168.99.100:8848
  redis:
    database: 0
    host: 192.168.99.100
    port: 6379
    password:
    timeout: 500
    pool:
      max-active: 20
      max-wait: -1
      max-idle: 8
      min-idle: 0
#  cloud:
#    zookeeper:
#      connect-string: 192.168.99.100:2181
#      discovery:
#        enabled: true
server:
    port: 6390

给启动类，添加注解。@EnableCaching
ComponentApplication.java

package com.lac.component;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
@EnableCaching
public class ComponentApplication {

	public static void main(String[] args) {
		SpringApplication.run(ComponentApplication.class, args);
	}

}

controller
DemoController.java

package com.lac.component.controller;

import org.springframework.cache.annotation.CacheEvict;
import org.springframework.cache.annotation.Cacheable;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class DemoController {
    @GetMapping("/")
    public String getHello() {
        return "hello";
    }
    @GetMapping("/user/{string}")
    public String test(@PathVariable String string) {
        return "Hello Nacos :" + string;
    }
    @GetMapping("/cached/{str}")
    @Cacheable(value = "cached",key = "#str")
    public String caching(@PathVariable String str) {
    	System.out.println("未走缓存"+ str);
    	return "hello redis-cache:"+ str;
    }
    @GetMapping("/deleteCacheAll")
    @CacheEvict(value="cached", allEntries=true)
    public String deleteCacheAll() {
    	System.out.println("清空所有缓存");
    	return "delete All redis-cache";
    }
    @GetMapping("/deleteCache/{str}")
    @CacheEvict(cacheNames = "cached", key = "#str")
    public String deleteCache(@PathVariable String str) {
    	System.out.println("删除单个缓存"+ str);
    	return "delete redis-cache:"+ str;
    }
}

@Cacheable是先查询后缓存，
@CacheEvict是删除缓存。

多次访问路径，只有一次，说明缓存成功


多次访问，
缓存成功，由此可以换成你的数据库SQL查询。

再来个删除一个的。



删除所有缓存


完成了，就是这么简单。

符合你口味的毒鸡汤：

个性定律：在单位里，一个人的个性与他的业务能力成正比。一个人的业务能力越强，个性也就越强，反之就越没有个性。