Spring中自定义FilterType指定组件过滤规则
1、如果要自定义组件扫描过滤类型，需要继承TypeFilter接口。
2、在TypeFilter中有一个需要实现的接口方法：
boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory)
throws IOException;
这个接口有两个参数：
MetadataReader表示读取到的当前正在扫描的类的信息。
MetadataReaderFactory 表示可以获得到其他任何类的信息。
3、新建一个组件过滤器自定义TypeFilter类：MyTypeFilter。
package com.gwolf.config;
import java.io.IOException;
import org.springframework.core.io.Resource;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.ClassMetadata;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.core.type.filter.TypeFilter;
public class MyTypeFilter implements TypeFilter {
@Override
public boolean match(MetadataReader metadataReader,
MetadataReaderFactory metadataReaderFactory)
throws IOException {
//获取当前类注解的信息
AnnotationMetadata annotationMetadata = metadataReader.getAnnotationMetadata();
//获取当前扫描类的信息
ClassMetadata classMetadata = metadataReader.getClassMetadata();
//获取当前类的资源信息(类的路径)
Resource resource = metadataReader.getResource();
String className = classMetadata.getClassName();
System.out.println(className+"-------------");
return false;
}
}
4、在组件扫描配置类上配置上述的自定义组件扫描类：
package com.gwolf.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;
import com.gwolf.vo.Person;
@Configuration
@ComponentScan(value="com.gwolf",
includeFilters= {@Filter(type = FilterType.ANNOTATION,
classes= {Controller.class}),
@Filter(type = FilterType.CUSTOM,
classes= {MyTypeFilter.class})},useDefaultFilters=false)
public class ComponentConfig {
@Bean
public Person getPerson() {
return new Person("百度", 10000);
}
}
5、运行java测试类，查看自定义过滤器扫描打印的类名称。
6、接下来自定义扫描规则值扫描Service结尾的java类。
package com.gwolf.config;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.ComponentScan.Filter;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;
import com.gwolf.vo.Person;package com.gwolf.config;
import java.io.IOException;
import org.springframework.core.io.Resource;
import org.springframework.core.type.AnnotationMetadata;
import org.springframework.core.type.ClassMetadata;
import org.springframework.core.type.classreading.MetadataReader;
import org.springframework.core.type.classreading.MetadataReaderFactory;
import org.springframework.core.type.filter.TypeFilter;
public class MyTypeFilter implements TypeFilter {
@Override
public boolean match(MetadataReader metadataReader,
MetadataReaderFactory metadataReaderFactory)
throws IOException {
//获取当前类注解的信息
AnnotationMetadata annotationMetadata = metadataReader.getAnnotationMetadata();
//获取当前扫描类的信息
ClassMetadata classMetadata = metadataReader.getClassMetadata();
//获取当前类的资源信息(类的路径)
Resource resource = metadataReader.getResource();
String className = classMetadata.getClassName();
if(className.contains("Service")) {
return true;
}
return false;
}
}
@Configuration
@ComponentScan(value="com.gwolf",
includeFilters= {@Filter(type = FilterType.ANNOTATION,
classes= {Controller.class}),
@Filter(type = FilterType.CUSTOM,
classes= {MyTypeFilter.class})},useDefaultFilters=false)
public class ComponentConfig {
@Bean
public Person getPerson() {
return new Person("百度", 10000);
}
}
