写一个ehcache3的配置类并写一个测试

### 回答1：
好的，下面是一个使用 Ehcache 3 的配置类和测试示例：

配置类：

import org.ehcache.config.builders.CacheConfigurationBuilder;
import org.ehcache.config.builders.CacheManagerBuilder;
import org.ehcache.config.builders.ResourcePoolsBuilder;
import org.ehcache.config.units.MemoryUnit;
import org.ehcache.core.config.DefaultConfiguration;
import org.ehcache.impl.config.persistence.DefaultPersistenceConfiguration;
import org.ehcache.jsr107.Eh107Configuration;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

import java.io.File;

@Configuration
@EnableCaching
public class Ehcache3Config {

    @Value("${ehcache.diskStore.path}")
    private String diskStorePath;

    @Value("${ehcache.maxEntriesLocalHeap}")
    private long maxEntriesLocalHeap;

    @Value("${ehcache.maxEntriesLocalDisk}")
    private long maxEntriesLocalDisk;

    @Bean
    public javax.cache.CacheManager cacheManager() {
        CacheManagerBuilder<DefaultConfiguration> cacheManagerBuilder = CacheManagerBuilder.newCacheManagerBuilder();
        DefaultConfiguration defaultConfiguration = new DefaultConfiguration(defaultCacheConfiguration(), createCacheConfigurations());
        DefaultPersistenceConfiguration persistenceConfiguration = new DefaultPersistenceConfiguration(new File(diskStorePath));
        cacheManagerBuilder.with(persistenceConfiguration);
        cacheManagerBuilder.withCache("preConfigured", CacheConfigurationBuilder.newCacheConfigurationBuilder(Long.class, String.class, ResourcePoolsBuilder.newResourcePoolsBuilder().heap(maxEntriesLocalHeap, MemoryUnit.ENTRIES).disk(maxEntriesLocalDisk, MemoryUnit.ENTRIES)).build());
        return cacheManagerBuilder.build(true);
    }

    private CacheConfigurationBuilder<Long, String> defaultCacheConfiguration() {
        return CacheConfigurationBuilder.newCacheConfigurationBuilder(Long.class, String.class, ResourcePoolsBuilder.newResourcePoolsBuilder().heap(maxEntriesLocalHeap, MemoryUnit.ENTRIES).disk(maxEntriesLocalDisk, MemoryUnit.ENTRIES));
    }

    private javax.cache.configuration.Configuration[] createCacheConfigurations() {
        javax.cache.configuration.Configuration[] cacheConfigurations = new javax.cache.configuration.Configuration[1];
        cacheConfigurations[0] = Eh107Configuration.fromEhcacheCacheConfiguration(CacheConfigurationBuilder.newCacheConfigurationBuilder(Long.class, String.class, ResourcePoolsBuilder.newResourcePoolsBuilder().heap(maxEntriesLocalHeap, MemoryUnit.ENTRIES).disk(maxEntriesLocalDisk, MemoryUnit.ENTRIES)).build());
        return cacheConfigurations;
    }
}

测试类：

### 回答2：
Ehcache是一个Java开发中常用的缓存框架，用于提高系统性能。下面是一个示例的Ehcache3配置类及对应的测试代码：

1. Ehcache3配置类：

import org.ehcache.Cache;
import org.ehcache.CacheManager;
import org.ehcache.config.CacheConfiguration;
import org.ehcache.config.builders.CacheConfigurationBuilder;
import org.ehcache.config.builders.CacheManagerBuilder;
import org.ehcache.config.builders.ResourcePoolsBuilder;
import org.ehcache.expiry.Duration;
import org.ehcache.expiry.Expirations;

import java.util.concurrent.TimeUnit;

public class EhcacheConfig {

    public static CacheManager createCacheManager() {
        CacheManager cacheManager = CacheManagerBuilder.newCacheManagerBuilder().withCache("myCache",
                getCacheConfiguration()).build();
        cacheManager.init();
        return cacheManager;
    }

    private static CacheConfiguration<String, String> getCacheConfiguration() {
        return CacheConfigurationBuilder.newCacheConfigurationBuilder(String.class, String.class,
                ResourcePoolsBuilder.heap(100))
                .withExpiry(Expirations.timeToLiveExpiration(Duration.of(10, TimeUnit.MINUTES)))
                .build();
    }
}

该配置类创建了一个名为"myCache"的缓存，使用堆内存资源池，并设置了10分钟的过期时间。

2. Ehcache3测试类：

import org.ehcache.Cache;
import org.ehcache.CacheManager;

public class EhcacheTest {

    public static void main(String[] args) {

        // 创建Ehcache缓存管理器
        CacheManager cacheManager = EhcacheConfig.createCacheManager();

        // 获取名为"myCache"的缓存
        Cache<String, String> cache = cacheManager.getCache("myCache", String.class, String.class);

        // 添加缓存数据
        cache.put("key1", "value1");
        cache.put("key2", "value2");

        // 获取缓存数据
        System.out.println("Value for key1: " + cache.get("key1"));
        System.out.println("Value for key2: " + cache.get("key2"));

        // 关闭缓存管理器
        cacheManager.close();
    }
}

以上是一个使用Ehcache3的配置类和测试代码。配置类创建了一个缓存管理器，并配置了一个名为"myCache"的缓存，测试类利用该配置创建了一个缓存管理器实例，并使用该缓存管理器添加和获取缓存数据。最后，关闭缓存管理器释放资源。

### 回答3：
下面是一个使用ehcache3的配置类的示例：

import org.ehcache.Cache;
import org.ehcache.CacheManager;
import org.ehcache.config.builders.CacheConfigurationBuilder;
import org.ehcache.config.builders.CacheManagerBuilder;
import org.ehcache.config.builders.ResourcePoolsBuilder;
import org.ehcache.core.EhcacheManager;

public class EhcacheConfig {

    private CacheManager cacheManager;

    public void initCacheManager() {
        cacheManager = CacheManagerBuilder.newCacheManagerBuilder()
                .build(true);
    }

    public void createCache(String cacheName) {
        Cache<String, Object> cache = cacheManager.createCache(cacheName, CacheConfigurationBuilder
                .newCacheConfigurationBuilder(String.class, Object.class, ResourcePoolsBuilder.heap(100)));
    }

    public void put(String cacheName, String key, Object value) {
        Cache<String, Object> cache = cacheManager.getCache(cacheName, String.class, Object.class);
        cache.put(key, value);
    }

    public Object get(String cacheName, String key) {
        Cache<String, Object> cache = cacheManager.getCache(cacheName, String.class, Object.class);
        return cache.get(key);
    }

    public void closeCacheManager() {
        cacheManager.close();
    }

    public static void main(String[] args) {
        EhcacheConfig ehcacheConfig = new EhcacheConfig();
        ehcacheConfig.initCacheManager();
        ehcacheConfig.createCache("testCache");
        ehcacheConfig.put("testCache", "key", "value");
        Object result = ehcacheConfig.get("testCache", "key");
        System.out.println(result);
        ehcacheConfig.closeCacheManager();
    }
}

以上是一个使用`Ehcache3`的配置类的示例，包括了初始化缓存、创建缓存、添加缓存数据、获取缓存数据以及关闭缓存管理器的方法。其中`createCache`方法中使用了`CacheConfigurationBuilder`来指定缓存的键值类型和资源池大小，`put`方法和`get`方法分别用于添加和获取缓存数据。在主函数中，我们演示了如何使用上述方法来初始化缓存、创建缓存、添加数据、获取数据并关闭缓存管理器。

希望这个示例对您有所帮助，如果有任何问题，请随时向我提问。