Spring Boot 缓存应用 Memcached 入门教程

时间:2023-03-08 17:00:29

本章学习 Mmecached 在 Spring Boot 中的使用教程。Memcached 与 Redis 各有好处。本文主要学习 Spring Boot 中如何应用集成 Mmecached

  • spring boot 1.5.x/2.x
  • memcached
  • jdk 1.8+

本项目源码下载

1 安装 memcached

window 下安装比较方便,直接 双击 exe 安装文件即可;

mac 下安装使用命令行安装

brew install libmemcached
brew install memcached
rew services start memcached

注意,如果遇到 update .... 需要等待很久的,就请按组合键 command+c 取消brew的更新,直接执行命令。

2 新建 Spring Boot Maven 示例工程项目

注意:是用来 IDEA 开发工具

  1. File > New > Project,如下图选择 Spring Initializr 然后点击 【Next】下一步
  2. 填写 GroupId(包名)、Artifact(项目名) 即可。点击 下一步

    groupId=com.fishpro

    artifactId=memcached
  3. 选择依赖 Spring Web Starter 前面打钩。
  4. 项目名设置为 spring-boot-study-memcached.

3 引入依赖 Pom

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/net.spy/spymemcached add by fishpro at 2019-08-07-->
<dependency>
<groupId>net.spy</groupId>
<artifactId>spymemcached</artifactId>
<version>2.12.3</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>

4 配置 Memcached 对 MemcachedClient进行初始化

MemcacheConfig 路径 src/main/java/com/fishpro/memcached/config/RedisController(路径.java)

package com.fishpro.memcached.config;

import net.spy.memcached.MemcachedClient;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.CachingConfigurerSupport;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration; import java.io.IOException;
import java.net.InetSocketAddress; @EnableCaching
@Configuration
public class MemcacheConfig extends CachingConfigurerSupport { @Value("${memcached.port}")
private Integer port;
@Value("${memcached.ip}")
private String ip;
@Bean
public MemcachedClient memcachedClient(){
try {
return new MemcachedClient(new InetSocketAddress(ip,port));
}catch (IOException e){
e.printStackTrace();
return null;
}
}
}

5 编写RestController测试代码

不太习惯使用单元测试,这里给出 RestController 的测试代码

方法 作用
set(key,value) 向key中添加值如果存就替换
add(key,value) 向key中添加值如果存在就不替换
replace(key,value) 替换缓存key的值为value
delete(key) 删除缓存key的值

注意生效时间单位秒

@RestController
public class UserController { @Autowired
private MemcachedClient memcachedClient; @RequestMapping("/test")
public String test(){
System.out.println("======set/get 方式演示===============================");
memcachedClient.set("FPCACHE",3,"THIS IS TEST 这是测试");
System.out.println("设置与读取 FPCACHE 值:"+memcachedClient.get("FPCACHE")); memcachedClient.set("FPCACHE",3,"使用SET添加到一个存在的值的缓存");
System.out.println("再次读取 FPCACHE 值:"+memcachedClient.get("FPCACHE")); System.out.println("======add 方式演示===============================");
memcachedClient.add("FPCACHE",3,"使用ADD添加到一个存在的值的缓存");
System.out.println("再次读取 FPCACHE 值:"+memcachedClient.get("FPCACHE")); memcachedClient.add("FPCACHE2",3,"使用ADD添加到新的缓存键FPCACHE2中");
System.out.println("再次读取 FPCACHE2 值:"+memcachedClient.get("FPCACHE2")); System.out.println("======replace 方式演示===============================");
memcachedClient.replace("FPCACHE",3,"使用Replace替换FPCACHE键对应的缓存值");
System.out.println("replace方式读取 FPCACHE 值:"+memcachedClient.get("FPCACHE")); try {
Thread.sleep(3001);
}catch (Exception ex){}
System.out.println("3秒过后再次获取缓存 FPCACHE: "+memcachedClient.get("FPCACHE")); System.out.println("======delete 方式演示===============================");
memcachedClient.delete("FPCACHE");
System.out.println("replace方式读取 FPCACHE 值:"+memcachedClient.get("FPCACHE")); return "";
}
}

6 运行示例

右键 MemcachedApplication 选择 Run MemcachedApplication 在浏览器中输入 http://localhost:8080/test

本项目源码下载


参考

官方 Memcached github