java - 如何从不同的属性文件中为 Bean 列表配置 Spring 配置？

Question

我有可用的 Spring XML 配置，我想将其移至注释配置。

问题是如何从不同的属性文件创建不同的bean。

这是 XML 片段:

<bean id="auditorium1" class="net.lelyak.edu.entity.Auditorium"
      c:name="${auditorium1.name}" c:numberOfSeats="${auditorium1.number-of-seats}" 
      c:vipSeats="${auditorium1.vip-seats}"/>
<bean id="auditorium2" class="net.lelyak.edu.entity.Auditorium"
      c:name="${auditorium2.name}" c:numberOfSeats="${auditorium2.number-of-seats}" 
      c:vipSeats="${auditorium2.vip-seats}"/>
<bean id="auditorium3" class="net.lelyak.edu.entity.Auditorium"
      c:name="${auditorium3.name}" c:numberOfSeats="${auditorium3.number-of-seats}" 
      c:vipSeats="${auditorium3.vip-seats}"/>

<util:list id="auditoriumsList">
    <ref bean="auditorium1"/>
    <ref bean="auditorium2"/>
    <ref bean="auditorium3"/>
</util:list>

<bean id="conversionService"
      class="org.springframework.context.support.ConversionServiceFactoryBean" /> 

<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
    <property name="locations">
        <list>
            <value>classpath:properties/auditorium1.properties</value>
            <value>classpath:properties/auditorium2.properties</value>
            <value>classpath:properties/auditorium3.properties</value>
            <value>classpath:db/dp.properties</value>
        </list>
    </property>
    <property name="ignoreResourceNotFound" value="true"/>
    <property name="systemPropertiesMode">
        <util:constant
                static-field="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer.SYSTEM_PROPERTIES_MODE_OVERRIDE"/>
    </property>
</bean>

属性文件示例:

auditorium1.name=yellow
auditorium1.number-of-seats=150
auditorium1.vip-seats=1,2,3,4,5,6,7,8,9

我想将其移至注释配置，例如:

@Configuration
public class AuditoriumConfiguration {

    @Bean
    public Auditorium auditorium1() {
        return new Auditorium();
    }

    @Bean
    public Auditorium auditorium2() {
        return new Auditorium();
    }

    @Bean
    public Auditorium auditorium3() {
        return new Auditorium();
    }

    @Bean
    public List<Auditorium> auditoriumsList() {
        return Arrays.asList(auditorium1(), auditorium2(), auditorium3());
    }

    @Bean
    public ConversionService conversionService() {
        return new DefaultConversionService();
    }
}

这里是 POJO 礼堂:

@Component
public class Auditorium {
    private Integer id;
    private String name;
    private Integer numberOfSeats;
    private Set<Integer> vipSeats;
    // get / set

如何为每个属性文件创建不同的 Auditorium 实例？

我想我可以使用@Value，但我找不到为每个属性文件创建对象的方法。

有什么建议吗？

Answer 1

首先，您不需要列表，如果您需要类型列表，只需添加 @Autowired到一个集合，spring 会将该 bean 的所有类型注入(inject)到该集合中。

要获取属性，您可以使用 Environment您可能想为此添加一个帮助器/工厂方法。

转换服务已默认配置，因此无需添加。

要加载配置文件，请添加 @PropertySource到您的配置类。如果您需要@Value或替换占位符，您需要添加 PropertySourcesPlaceholderConfigurer作为static bean 。

基本上，这样的事情应该可以实现你想要的。

@Configuration
@PropertySource({"classpath:properties/auditorium1.properties",
        "classpath:properties/auditorium2.properties",
        "classpath:properties/auditorium3.properties",
        "classpath:db/dp.properties"})
public class AuditoriumConfiguration {

    @Autowired
    private Environment env;

    @Bean
    public static PropertySourcesPlaceholderConfigurer placeholderConfigurer() {
        return new PropertySourcesPlaceholderConfigurer();
    }

    private Auditorium createAuditorium(String prefix) {
        String nameString = env.getProperty(prefix + ".name");
        String strNumberOfSeats = env.getProperty(prefix + ".number-of-seats");
        Integer[] integers = env.getProperty(prefix + ".vip-seats", Integer[].class);
        Set<Integer> integerSet = Arrays.stream(integers).collect(Collectors.toSet());

        Auditorium auditorium = new Auditorium();
        auditorium.setName(nameString);
        auditorium.setNumberOfSeats(Integer.valueOf(strNumberOfSeats));
        auditorium.setVipSeats(integerSet);
        return auditorium;
    }

    @Bean
    public Auditorium auditorium1() {
        return createAuditorium("auditorium1");
    }

    @Bean
    public Auditorium auditorium2() {
        return createAuditorium("auditorium2");
    }

    @Bean
    public Auditorium auditorium3() {
        return createAuditorium("auditorium3");
    }
}

现在，如果您想要这些类的列表，只需添加 List<Auditorium> spring 会将所有依赖项注入(inject)到该列表中。

public class MyClass {
    @Autowired
    private List<Auditorium> auditoriums;
}