Spring容器管理Jar包内XML Bean的5种方式

import org.springframework.context.annotation.ImportResource;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
// 加载 jar 包内的 xml，classpath*: 表示扫描所有依赖 jar 包
@ImportResource(locations = "classpath*:applicationContext-xxx.xml")
public class MyApplication {
    public static void main(String[] args) {
        SpringApplication.run(MyApplication.class, args);
    }
}

<!-- 主配置文件中引入 jar 包内的 xml -->
<import resource="classpath*:service-context.xml"/>

import org.springframework.context.support.ClassPathXmlApplicationContext;

// 加载 jar 包内 xml，创建上下文
ClassPathXmlApplicationContext context = 
    new ClassPathXmlApplicationContext("classpath*:bean-context.xml");

// 获取 bean
YourBean bean = context.getBean(YourBean.class);

import org.springframework.context.ApplicationContextInitializer;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class XmlContextInitializer implements ApplicationContextInitializer {
    @Override
    public void initialize(ConfigurableApplicationContext applicationContext) {
        ClassPathXmlApplicationContext xmlContext = 
            new ClassPathXmlApplicationContext("classpath*:external-beans.xml");
        
        // 将 jar 中的 bean 合并到主容器
        applicationContext.setParent(xmlContext);
    }
}

org.springframework.context.ApplicationContextInitializer=com.xxx.XmlContextInitializer

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.beans.factory.xml.XmlBeanDefinitionReader;
import org.springframework.context.support.GenericApplicationContext;

@Configuration
public class XmlImportConfig {

    @Bean
    public void loadJarXml(GenericApplicationContext context) {
        XmlBeanDefinitionReader reader = new XmlBeanDefinitionReader(context);
        // 加载 jar 包内 xml
        reader.loadBeanDefinitions("classpath*:dao-context.xml");
    }
}