This chapter is a tutorial on the use of Mmecached in Spring Boot. Memcached and Redis have their own advantages. This paper mainly studies how to apply integrated Mmecached in Spring Boot.

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

Source code download of this project

1 Install memcached

It is convenient to install under window s. Just double-click the exe installation file directly.

mac Installation Using Command Line Installation

brew install libmemcached
brew install memcached
rew services start memcached

Note that if you encounter update... and need to wait for a long time, press the combination key command+c to cancel the update of brew and execute the command directly.

2 New Spring Boot Maven Demonstration Project

Note: This is an IDEA development tool

1. File > New > Project, select Spring Initializr as shown below and click Next for the next step
2. Fill in GroupId (package name) and Artifact (project name). Click Next
   groupId=com.fishpro
   artifactId=memcached
3. Check before choosing to rely on Spring Web Starter.
4. The project name is set to spring-boot-study-memcached.

3 Introducing Dependent 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 Configure Memcached to initialize MemcachedClient

MemcacheConfig path src/main/java/com/fishpro/memcached/config/RedisController (path.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 Write RestController test code

Not used to unit testing. Here's the test code for RestController

Note the effective time unit second

@RestController
public class UserController {

    @Autowired
    private MemcachedClient memcachedClient;


    @RequestMapping("/test")
    public  String test(){
        System.out.println("======set/get Mode demonstration===============================");
        memcachedClient.set("FPCACHE",3,"THIS IS TEST This is the test.");
        System.out.println("Setting and Reading FPCACHE value:"+memcachedClient.get("FPCACHE"));

        memcachedClient.set("FPCACHE",3,"Use SET Cache added to an existing value");
        System.out.println("Read again FPCACHE value:"+memcachedClient.get("FPCACHE"));

        System.out.println("======add Mode demonstration===============================");
        memcachedClient.add("FPCACHE",3,"Use ADD Cache added to an existing value");
        System.out.println("Read again FPCACHE value:"+memcachedClient.get("FPCACHE"));

        memcachedClient.add("FPCACHE2",3,"Use ADD Add to new cache key FPCACHE2 in");
        System.out.println("Read again FPCACHE2 value:"+memcachedClient.get("FPCACHE2"));

        System.out.println("======replace Mode demonstration===============================");
        memcachedClient.replace("FPCACHE",3,"Use Replace replace FPCACHE Key corresponding cache value");
        System.out.println("replace Mode reading FPCACHE value:"+memcachedClient.get("FPCACHE"));

        try {
            Thread.sleep(3001);
        }catch (Exception ex){}
        System.out.println("3 Get the cache again after seconds FPCACHE: "+memcachedClient.get("FPCACHE"));

        System.out.println("======delete Mode demonstration===============================");
        memcachedClient.delete("FPCACHE");
        System.out.println("replace Mode reading FPCACHE value:"+memcachedClient.get("FPCACHE"));

        return "";
    }
}

6 Running examples

Right-click Memcached Application and select Run Memcached Application to enter http://localhost:8080/test in the browser

Source code download of this project

Reference resources
Official Memcached github