【Spring註解】@Configuration和@ComponentScan註解

Spring註解

一、組建註冊

包結構：

1.@Configuration和@ComponentScan

@ComponentScan的includeFilters用法

FilterType的類型

ANNOTATION,基於註解的過濾
ASSIGNABLE_TYPE,指定class
ASPECTJ,ASPECTJ表達shi
REGEX,正則表達式
CUSTOM;自定義

//相當於application-bean.xml
@Configuration 
//配置掃描包的策略，當前註解爲只掃描加@Controller的組件
//注意useDefaultFilters要設置爲fasle，不然爲默認的Filters，@Service/@Repository都掃描
@ComponentScan(value = "com.gaoyuzhe",includeFilters = {
        @ComponentScan.Filter(type = FilterType.ANNOTATION,value = Controller.class)
},
        useDefaultFilters = false)

運行結果

excludeFilters用法：

注意:useDefaultFilters設置爲true，不然不會掃描到組件

package com.gaoyuzhe.config;

import com.gaoyuzhe.pojo.Person;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.FilterType;
import org.springframework.stereotype.Controller;

/**
 * @author GaoYuzhe
 * @date 2018/3/12.
 */
@Configuration
@ComponentScan(value = "com.gaoyuzhe",excludeFilters = {
        @ComponentScan.Filter(type = FilterType.ANNOTATION,value = Controller.class)
},
        useDefaultFilters = true)
public class MainConfig {

    @Bean
    public Person person(){
        return new Person("gaoyuzhe ",12);
    }
}

運行結果

自定義Filter策略

/**
 * 自定義的過濾規則
 * @author GaoYuzhe
 * @date 2018/3/12.
 */
public class MyTypeFilter implements TypeFilter {
    /**
     * 匹配規則
     * @param metadataReader the metadata reader for the target class
     *                       當前類的信息
     * @param metadataReaderFactory  a factory for obtaining metadata readers
     *                                for other classes (such as superclasses and interfaces)
     *                               當前類的父類或者接口的信息
     * @return 是否匹配
     * @throws IOException
     */
    public boolean match(MetadataReader metadataReader, MetadataReaderFactory metadataReaderFactory) throws IOException {
        ClassMetadata classMetadata = metadataReader.getClassMetadata();
        //當前類名稱
        String className = classMetadata.getClassName();
        System.out.println("className = " + className);
        //當前類的資源路徑
        Resource resource = metadataReader.getResource();
        System.out.println("resource = " + resource);
        //如果類名包含"Dao",則爲匹配成功
        return className.contains("Dao");
    }
}

配置類註解。

 @Configuration
 @ComponentScan(value = "com.gaoyuzhe",includeFilters = {
         @ComponentScan.Filter(type = FilterType.CUSTOM,classes = MyTypeFilter.class)
 }, useDefaultFilters = false)

執行結果