如何在XML配置文件中使用Spring Boot自动配置的bean？

我想在XML配置文件中利用一些Spring Boot自动配置的bean,但是当我尝试这样做时,我会继续遇到异常和错误.

例如,如果我的类路径上有数据相关的库,Spring Boot将自动配置一个可以自动连接到我自己的bean和类中的DataSource对象,如下所示：

@Configuration
@ImportResource("classpath:xmlconfig.xml")
public class Config {

    // This works!!
    @Autowired
    private DataSource dataSource;

    @Bean
    public ClassThatRequiresADataSource() {
        ClassThatRequiresADataSource foo = new ClassThatRequiresADataSource();
        foo.setDataSource(dataSource);
        return foo;
    }
}

但是,如果我尝试在XML配置文件中执行相同的操作,我将收到一个异常.我已经通过在我的主配置类中添加了一个@ImportResource(“classpath：xmlconfig.xml”)来引导XML配置文件.这是我正在谈论的一个例子…在xmlconfig.xml里面：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <!-- THIS DOES NOT WORK! -->
    <bean id="anotherClassThatRequiresADataSource" class="my.package.AnotherClassThatRequiresADataSource">
        <property name="dataSource" ref="dataSource"/>
    </bean>

</beans>

上述将在运行Spring Boot应用程序时给出异常,尽管dataSource是一个有效的自动配置的Bean名称.我也尝试过使用自动配置的ConnectionFactory(在类路径上使用ActiveMQ)和EntityManagerFactory与Hibernate& JPA在类路径上,没有一个工作.

基本上,我所要问的是什么是相当于将自动连接Spring Boot自动配置的bean转换成XML配置文件？

这是我的主要的Spring Boot入门点只是所有文档中列出的标准类：

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application {

    public static void main(String[] args) throws Exception {
        SpringApplication.run(Application.class,args);
    }
}

我主要在Spring Integration应用程序中使用这个应用程序,其中Java配置不太受支持,框架的核心是基于XML配置,但是我想使用Spring Boot自动配置的DataSource和ConnectionFactory bean一些集成元素.

编辑：@AdilF提供的答案适用于dataSource bean,但是类似的配置不适用于connectionFactory bean.请参阅以下演示代码的GitHub项目：

https://github.com/ccampo133/autoconfig-test/tree/master

如果有人能弄清楚如何正确连接connectionFactory bean,我将非常感谢.

以下是大部分代码说明：

Application.java

@Configuration
@ComponentScan
@EnableAutoConfiguration
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class,args);
    }
}

Config.java

@Configuration
@ImportResource("classpath:/resources/config.xml")
public class Config { }

FooService.java

@Service
public class FooService {

    final private Logger logger = LoggerFactory.getLogger(FooService.class);

    @Autowired
    private DataSource dataSource;

    @Autowired
    private ConnectionFactory connectionFactory;

    @Autowired
    private EntityManagerFactory entityManagerFactory;

    @PostConstruct
    public void init() {
        Assert.notNull(dataSource,"dataSource is null!");
        logger.info("dataSource not null");

        Assert.notNull(connectionFactory,"connectionFactory is null!");
        logger.info("connectionFactory not null");

        Assert.notNull(entityManagerFactory,"entityManagerFactory is null!");
        logger.info("entityManagerFactory is not null");
    }
}

BarService.java

public class BarService {

    final private Logger logger = LoggerFactory.getLogger(BarService.class);

    private DataSource dataSource;

    private ConnectionFactory connectionFactory;

    private EntityManagerFactory entityManagerFactory;

    public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
    }

    public void setConnectionFactory(ConnectionFactory connectionFactory) {
        this.connectionFactory = connectionFactory;
    }

    public void setEntityManagerFactory(final EntityManagerFactory entityManagerFactory) {
        this.entityManagerFactory = entityManagerFactory;
    }

    @PostConstruct
    public void init() {
        Assert.notNull(dataSource,"entityManagerFactory is null!");
        logger.info("entityManagerFactory is not null");
    }
}

config.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="barService" class="app.service.BarService">
        <!-- THIS WORKS! -->
        <property name="dataSource" ref="dataSource"/>

        <!-- THIS DOESN'T WORK! -->
        <property name="connectionFactory" ref="connectionFactory"/>
        <property name="entityManagerFactory" ref="entityManagerFactory"/>
    </bean>

</beans>

的build.gradle

buildscript {
    ext {
        junitVersion = "4.11"
        springBootVersion = "1.1.5.RELEASE"
        springIntegrationVersion = "4.0.3.RELEASE"
        activeMqVersion = "5.7.0"
    }

    repositories {
        mavenCentral()
    }

    dependencies {
        classpath "org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}"
    }
}

apply plugin: "java"
apply plugin: "eclipse"
apply plugin: "idea"
apply plugin: "spring-boot"

configurations {
    providedRuntime
}

jar {
    baseName = "autoconfig-test"
    version = "0.0.1-SNAPSHOT"
}

repositories {
    mavenCentral()
    maven { url "http://repo.spring.io/libs-milestone/" }
}

dependencies {
    // Spring Boot starters
    compile "org.springframework.boot:spring-boot-starter-data-jpa:${springBootVersion}"
    compile "org.springframework.boot:spring-boot-starter-integration:${springBootVersion}"
    compile "org.springframework.integration:spring-integration-jms:${springIntegrationVersion}"

    // ActiveMQ
    compile "org.apache.activemq:activemq-core:${activeMqVersion}"

    // Persistence
    runtime "com.h2database:h2"

    // Test
    testCompile "junit:junit:${junitVersion}"
}

package app;

import org.springframework.boot.SpringApplication;
import org.springframework.context.ConfigurableApplicationContext;
import org.springframework.util.Assert;

import javax.sql.DataSource;

public class Application {

    public static void main(String[] args) {
        ConfigurableApplicationContext context = SpringApplication.run(Config.class);
        DataSource dataSource = context.getBean("dataSource",DataSource.class);
        Assert.notNull(dataSource);
    }

}

package app;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.context.annotation.*;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;

import javax.sql.DataSource;

@Configuration
@EnableAutoConfiguration
@EnableJpaRepositories
@ComponentScan
@ImportResource("classpath:config.xml")
public class Config {

    @Autowired
    private DataSource dataSource;

}

package app.service;

import org.springframework.util.Assert;
import javax.annotation.PostConstruct;
import javax.sql.DataSource;

public class BarService {

    private DataSource dataSource;

    public void setDataSource(DataSource dataSource) {
        this.dataSource = dataSource;
    }

    @PostConstruct
    public void init() {
        Assert.notNull(dataSource);
    }
}

package app.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.util.Assert;

import javax.annotation.PostConstruct;
import javax.sql.DataSource;

@Service
public class FooService {

    @Autowired
    DataSource dataSource;

    @PostConstruct
    public void init() {
        Assert.notNull(dataSource);
    }

}

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd">

    <bean id="barService" class="app.service.BarService">
        <property name="dataSource" ref="dataSource"/>
    </bean>

</beans>