【Springboot】排除多余依赖与Bean实例

一、背景： 引入公共包之后，需要排除部分不需要的包和bean，给当前服务最大程度减重

二、实现：

1.在pom.xml排除依赖

 2.在启动类上添加扫描排除项

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@ComponentScan(basePackages = {"com.xxx"},       excludeFilters = {             @ComponentScan.Filter(                   type = FilterType.CUSTOM, classes = {ScanExcludeFilter.class}             )       }) public class Application {      public static void main(String[] args) throws Exception {       SpringApplication.run(Application.class, args);    }   }

其中，FilterType有以下几种：

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public enum FilterType {     ANNOTATION, //按照注解过滤     ASSIGNABLE_TYPE, //按照类型过滤     ASPECTJ,//按照ASPECTJ表达式过滤     REGEX,//按照正则表达式过滤     CUSTOM;//按照自定义的过滤规则过滤     private FilterType() {     } }

3.实现TypeFilter

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public class ScanExcludeFilter implements TypeFilter {       // 需要的Bean包含的关键字     private static final List<String> containsKeyWords = Arrays.asList(             "core.config",             "common.dao"     );     // 不能的Bean包含的关键字     private static final List<String> excludeKeyWords = Arrays.asList(             "XxxConfig"     );       @Override     public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory) throws IOException {         ClassMetadata classMetadata = metadataReader.getClassMetadata();         String className = classMetadata.getClassName();         if (!className.contains("ema")) {             return false;         }         // 先走排除         if (isExculdeBean(className)) {             return true;         }         // 再看是否真的满足         return !needContains(className);     }       // 匹配不需要的bean     private boolean isExculdeBean(String className) {         for (String keyword : excludeKeyWords) {             if (className.contains(keyword)) {                 return true;             }         }         return false;     }       // 匹配需要的bean     private boolean needContains(String className) {         for (String keyword : containsKeyWords) {             if (className.contains(keyword)) {                 return true;             }         }         return false;     }     }