<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-cache</artifactId>
            <version>....</version>
</dependency>

spring:
  cache:
    cache-names: [ huang,cache2 ]   //給緩存配置一個(gè)名稱

  <dependency>
            <groupId>com.github.whvcse</groupId>
            <artifactId>easy-captcha</artifactId>
            <version>1.6.2</version>
        </dependency>

package com.huang.test.captcha.controlloer;
import com.huang.test.captcha.common.R;
import com.wf.captcha.SpecCaptcha;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Collection;
import java.util.UUID;
@RestController
@RequestMapping("/demo")
public class DemoController {
    @Autowired
    private CacheManager cacheManager;
    @GetMapping("/getCaptcha")
    public R getCaptcha(){
        SpecCaptcha specCaptcha = new SpecCaptcha(130, 80, 5);   //新建一個(gè)驗(yàn)證碼類
        String verCode = specCaptcha.text().toLowerCase();		//生成驗(yàn)證碼字符
        System.out.println(verCode);
        String key = UUID.randomUUID().toString();		//為驗(yàn)證碼生成一個(gè)key , 這個(gè)key 是要返回給前端的
        System.out.println(cacheManager);
        //Collection<String> cacheNames = cacheManager.getCacheNames();
        //System.out.println(cacheNames.size());
        //for (String cacheName : cacheNames) {
         //   System.out.println(cacheName);
        //}
        Cache codeCache = cacheManager.getCache("huang");   //我們?cè)趛ml中 配置了一個(gè) 名為 huang  的Cache 
        codeCache.put(key,verCode);   //把 key  和  驗(yàn)證碼字符寫入緩存中
        return R.ok().put("key",key).put("imageStr", specCaptcha.toBase64());  返回前端驗(yàn)證碼的圖片
    }
	//這個(gè)方法是 上個(gè)方法中返回給前端的數(shù)據(jù)， 通返回的key 來讀取緩存， 及緩存中的數(shù)據(jù)
    @GetMapping("/getCache")
    public R getCache(String key){
        Cache codeCache = cacheManager.getCache("huang");
        String text = (String) codeCache.get(key).get();
        return R.ok().put("code",text);
    }
}

package com.huang.test.captcha.config;
import org.springframework.cache.Cache;
import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.concurrent.ConcurrentMapCache;
import org.springframework.cache.support.SimpleCacheManager;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import java.util.HashSet;
import java.util.Set;
@Configuration
@EnableCaching
public class CatchConfig {
    @Bean
    public CacheManager cacheManager(){
    	//catcheManager 是一個(gè)接口， 所以我們使用它的  SimpleCacheManager 的子類來創(chuàng)建
        SimpleCacheManager simpleCacheManager = new SimpleCacheManager();
       	//simpleCacheManager 需要指定它所管理的 緩存類 列表，  所以我們這里新建一個(gè) set 且來存放 Cache 緩存類
        Set<Cache> set = new HashSet<>();
        Cache cache = new ConcurrentMapCache("huang");  //創(chuàng)建一個(gè) Cache 的緩存類 注意是 springboot 的緩存類， 不要引錯(cuò)了import org.springframework.cache.Cache;
        Cache cache2 = new ConcurrentMapCache("cache2"); //創(chuàng)建一個(gè) Cache 名為  cache2
        set.add(cache);
        set.add(cache2);
        simpleCacheManager.setCaches(set);   //設(shè)置 緩存管理類，所管理的緩存列表
        return simpleCacheManager;
    }
}