parent
4c3cdd2eba
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d2f7468acd
30 changed files with 350 additions and 154 deletions
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package cc.bnblogs.common; |
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import lombok.Data; |
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import org.springframework.boot.context.properties.ConfigurationProperties; |
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import org.springframework.stereotype.Component; |
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import org.thymeleaf.util.StringUtils; |
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import java.util.List; |
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/** |
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* @author zfp@bnblogs.cc |
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* @createTime: 2022/10/20 |
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*/ |
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@Component |
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@Data |
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@ConfigurationProperties(prefix = "default-images") |
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public class DefaultImages { |
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private List<String> images; |
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public String cover(String imgUrl) { |
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if (StringUtils.isEmptyOrWhitespace(imgUrl)) { |
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// 返回一张随机图
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return images.get((int)(Math.random() * images.size())); |
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} |
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return imgUrl; |
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} |
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} |
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package cc.bnblogs.config; |
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import org.springframework.cache.annotation.CachingConfigurerSupport; |
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import org.springframework.cache.interceptor.KeyGenerator; |
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import org.springframework.context.annotation.Configuration; |
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import org.thymeleaf.util.StringUtils; |
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import java.io.Serializable; |
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import java.util.Arrays; |
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/** |
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* @author zfp@bnblogs.cc |
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* @createTime: 2022/10/20 |
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*/ |
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@Configuration |
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public class CacheConfig extends CachingConfigurerSupport { |
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@Override |
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public KeyGenerator keyGenerator() { |
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return (target, method, params) -> new BlogCacheKey(target.getClass().getName(), method.getName(), params); |
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} |
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static class BlogCacheKey implements Serializable { |
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private final String className; |
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private final String methodName; |
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private final Object[] params; |
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private final int hashCode; |
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public BlogCacheKey(String className, String methodName, Object[] params) { |
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this.className = className; |
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this.methodName = methodName; |
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this.params = params; |
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String sign = className + "_" + methodName + "_" + Arrays.deepHashCode(params); |
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this.hashCode = sign.hashCode(); |
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} |
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@Override |
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public int hashCode() { |
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return this.hashCode; |
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} |
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@Override |
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public boolean equals(Object obj) { |
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if (obj == this) return true; |
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if (!(obj instanceof BlogCacheKey)) return false; |
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BlogCacheKey other = (BlogCacheKey) obj; |
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if (this.hashCode == other.hashCode) return true; |
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return StringUtils.equals(this.className, other.className) |
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&& StringUtils.equals(this.methodName, other.methodName) |
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&& Arrays.deepEquals(this.params, other.params); |
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} |
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} |
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} |
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<?xml version="1.0" encoding="UTF-8"?> |
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<ehcache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" |
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xsi:noNamespaceSchemaLocation="http://ehcache.org/ehcache.xsd" updateCheck="false"> |
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<!-- 磁盘缓存位置 --> |
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<diskStore path="./cache"/> |
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<!-- maxElementsInMemory： 在内存中缓存的element的最大数目。--> |
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<!-- eternal:elements是否永久有效，如果为true，timeouts将被忽略，element将永不过期 --> |
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<!-- timeToIdleSeconds:发呆秒数，发呆期间未访问缓存立即过期，当eternal为false时，这个属性才有效，0为不限制 --> |
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<!-- timeToLiveSeconds:总存活秒数，当eternal为false时，这个属性才有效，0为不限制 --> |
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<!-- overflowToDisk： 如果内存中数据超过内存限制，是否要缓存到磁盘上 --> |
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<!-- statistics：是否收集统计信息。如果需要监控缓存使用情况，应该打开这个选项。默认为关闭（统计会影响性能）。设置statistics="true"开启统计 --> |
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<!-- |
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默认缓存 |
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无过期时间，但 3600 秒内无人访问缓存立即过期 |
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--> |
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<cache name="blog-cache" |
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maxElementsInMemory="1000" |
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timeToIdleSeconds="3600" |
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timeToLiveSeconds="0" |
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overflowToDisk="true"> |
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</cache> |
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</ehcache> |
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package cc.bnblogs.test; |
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import cc.bnblogs.Application; |
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import cc.bnblogs.common.DefaultImages; |
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import org.junit.Test; |
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import org.junit.runner.RunWith; |
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import org.springframework.beans.factory.annotation.Autowired; |
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import org.springframework.boot.test.context.SpringBootTest; |
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import org.springframework.test.context.junit4.SpringRunner; |
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/** |
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* @author zfp@bnblogs.cc |
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* @createTime: 2022/10/20 |
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*/ |
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@RunWith(SpringRunner.class) |
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@SpringBootTest(classes = {Application.class}, webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT) |
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public class ImageTest { |
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@Autowired |
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private DefaultImages images; |
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@Test |
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public void getImage() { |
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System.out.println(images.cover("111")); |
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System.out.println(images.cover("")); |
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} |
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} |
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