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目标:实现自定义spring自动扫描注解。主要为后期实现分布式服务框架自动注解提供技术支持
技术分析:通过配置组件扫描标签使spring解析标签。
1. JewelScanBeanDefaultParser.java
public classJewelScanBeanDefaultParser implements BeanDefinitionParser {private static final String RESOURCE_PATTERN = "/**/*.class";private ResourcePatternResolver resourcePatternResolver = newPathMatchingResourcePatternResolver();publicBeanDefinition parse(Element element, ParserContext parserContext) {
String basePackage= element.getAttribute("base-package");if(StringUtils.hasText(basePackage)) {try{
String pattern= ResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX +ClassUtils.convertClassNameToResourcePath(basePackage)+RESOURCE_PATTERN;
Resource[] resources=resourcePatternResolver.getResources(pattern);
MetadataReaderFactory readerFactory= new CachingMetadataReaderFactory(this.resourcePatternResolver);for(Resource resource : resources) {if(resource.isReadable()) {
MetadataReader reader=readerFactory.getMetadataReader(resource);
String className=reader.getClassMetadata().getClassName();
Class> clazz =Class.forName(className);
JewelService jewelService= clazz.getAnnotation(JewelService.class);if (null !=jewelService) {
AnnotationBeanDefinitionLoader.load(jewelService, clazz, parserContext);
}
JewelRemote jewelRemote= clazz.getAnnotation(JewelRemote.class);if (null !=jewelRemote) {
AnnotationBeanDefinitionLoader.load(jewelRemote, clazz, parserContext);
}
}
}
}catch(IOException e) {
e.printStackTrace();
}catch(ClassNotFoundException e) {//TODO Auto-generated catch block
e.printStackTrace();
}
}return null;
}
}
2. 注解接口定义
JewelRemote.java
@Documented
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface JewelRemote {
public String name() default "";
public String version() default "v_0.0.1";
public String registry() default "registry";
}
JewelService.java
@Documented
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface JewelService {
public String name() default "";
public String version() default "v_0.0.1";
public String registry() default "registry";
}
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