- 例如 xxx-boot-start. 相似很多这种配置,本人也能够实现本人的插件。多模块工程中插件模式很多，针对多模块工程写了几个插件。
maven 依赖<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-autoconfigure</artifactId></dependency>- 写spring.factories形式
@Configuration@ConfigurationProperties(prefix = "cache")@Datapublic class CacheProperty { private Boolean enable; private long duration; private int initialCapacity; private long maximumSize; private String type;}@Configuration//扫描ioc 的bean 能够扫描第三方包/** * 或者 应用 * ComponentScan 包扫描 扫描包下的bean 也行 * EnableConfigurationProperties 注入配置类也能够 */@EnableConfigurationProperties(CacheProperty.class)//@ComponentScan("org.redorblack.*")public class CacheAutoConfiguration { @Bean public Cache<String, Object> creatCaffeineCache(CacheProperty cacheProperty) { return Caffeine.newBuilder() //设置最初一次写入或拜访后通过固定工夫过期 .expireAfterWrite(cacheProperty.getDuration(), TimeUnit.valueOf(cacheProperty.getType())) //初始化缓存空间大小 .initialCapacity(cacheProperty.getInitialCapacity()) //最大缓存数 .maximumSize(cacheProperty.getMaximumSize()) //关上value的弱援用 .weakValues() //关上key的弱援用 .weakKeys() .build(); }}## resources 上面新建META-INA文件夹 新建 spring.factoriesorg.springframework.boot.autoconfigure.EnableAutoConfiguration=\ org.redorblack.CacheAutoConfiguration一个简略的starter就实现了
- 能够不写 spring.factories
@Target({ElementType.TYPE})@Retention(RetentionPolicy.RUNTIME)@Documented////@Import(CacheAutoConfiguration.class)//导入主动注入配置类 能够不写 spring.factories文件@ImportAutoConfiguration(CacheAutoConfiguration.class)public @interface EnableCaffeineCache {}@Configuration@EnableConfigurationProperties(CacheProperty.class)public class CacheAutoConfiguration { @Bean public Cache<String, Object> creatCaffeineCache(CacheProperty cacheProperty) { return Caffeine.newBuilder() //设置最初一次写入或拜访后通过固定工夫过期 .expireAfterWrite(cacheProperty.getDuration(), TimeUnit.valueOf(cacheProperty.getType())) //初始化缓存空间大小 .initialCapacity(cacheProperty.getInitialCapacity()) //最大缓存数 .maximumSize(cacheProperty.getMaximumSize()) //关上value的弱援用 .weakValues() //关上key的弱援用 .weakKeys() .build(); }}这样也能够，应用注解也能够实现
- 还有种 EnableXXX，EnableSync这种注解,用的importSelector这种导入形式
@Target({ElementType.TYPE})@Retention(RetentionPolicy.RUNTIME)@Documented//引入选择器@Import(CaffeineCacheSelector.class)public @interface EnableCaffeineCache { /** * 默认开关 * * @return */ boolean enable() default false;}public class CaffeineCacheSelector implements ImportSelector { @Override public String[] selectImports(AnnotationMetadata importingClassMetadata) { Class<?> annotationType = EnableCaffeineCache.class; AnnotationAttributes attributes = AnnotationAttributes.fromMap(importingClassMetadata.getAnnotationAttributes( annotationType.getName(), false)); Boolean enable; if (attributes.getBoolean("enable")) enable = true; else enable = false; if (enable) { return new String[]{CacheAutoConfiguration.class.getName()}; } return new String[0]; }@Configuration//扫描ioc 的bean 能够扫描第三方包@ComponentScan("org.redorblack.*")public class CacheAutoConfiguration { @Bean public Cache<String, Object> creatCaffeineCache(CacheProperty cacheProperty) { System.out.println("曾经启动了 ------------------"); return Caffeine.newBuilder() //设置最初一次写入或拜访后通过固定工夫过期 .expireAfterWrite(cacheProperty.getDuration(), TimeUnit.valueOf(cacheProperty.getType())) //初始化缓存空间大小 .initialCapacity(cacheProperty.getInitialCapacity()) //最大缓存数 .maximumSize(cacheProperty.getMaximumSize()) //关上value的弱援用 .weakValues() //关上key的弱援用 .weakKeys() .build(); }