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+
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
- File > New > Project,如下图选择
Spring Initializr
然后点击 【Next】下一步 - 填写
GroupId
(包名)、Artifact
(项目名) 即可。点击 下一步
groupId=com.fishpro
artifactId=memcached - 选择依赖
Spring Web Starter
前面打钩。 - 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