Spring Boot 加载XML配置

官方Demo: spring-boot-sample-xml

修改pom.xml文件

    <parent>
        <!-- Your own application should inherit from spring-boot-starter-parent -->
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-samples</artifactId>
        <version>${revision}</version>
    </parent>

修改为

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
    </parent>

在terminal中进入项目根目录，执行mvn spring-boot:run

执行mvn test

添加属性文件
在resource/META-INF下创建msg.properties文件，内容如下：

name=java

修改配置文件application-context.xml

    <context:property-placeholder location="classpath:/META-INF/msg.properties" />
    <!-- <context:property-placeholder /> -->

执行mvn spring-boot:run

执行mvn test

修改单元测试方法testDefaultSettings()

import org.junit.Rule;
import org.junit.Test;

import org.springframework.boot.test.rule.OutputCapture;

import static org.assertj.core.api.Assertions.assertThat;

public class SampleSpringXmlApplicationTests {

    @Rule
    public OutputCapture outputCapture = new OutputCapture();

    @Test
    public void testDefaultSettings() throws Exception {
        SampleSpringXmlApplication.main(new String[0]);
        String output = this.outputCapture.toString();
        //assertThat(output).contains("Hello World");
        assertThat(output).contains("Hello java");
    }

}

执行mvn test

spring boot加载xml配置

SpringApplication.java部分代码

    public ConfigurableApplicationContext run(String... args) {
        StopWatch stopWatch = new StopWatch();
        stopWatch.start();
        ConfigurableApplicationContext context = null;
        Collection<SpringBootExceptionReporter> exceptionReporters = new ArrayList();
        this.configureHeadlessProperty();
        SpringApplicationRunListeners listeners = this.getRunListeners(args);
        listeners.starting();

        Collection exceptionReporters;
        try {
            ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);
            ConfigurableEnvironment environment = this.prepareEnvironment(listeners, applicationArguments);
            this.configureIgnoreBeanInfo(environment);
            Banner printedBanner = this.printBanner(environment);
            context = this.createApplicationContext();
            exceptionReporters = this.getSpringFactoriesInstances(SpringBootExceptionReporter.class, new Class[]{ConfigurableApplicationContext.class}, new Object[]{context});
            this.prepareContext(context, environment, listeners, applicationArguments, printedBanner);
            this.refreshContext(context);
            this.afterRefresh(context, applicationArguments);
            stopWatch.stop();
            if(this.logStartupInfo) {
                (new StartupInfoLogger(this.mainApplicationClass)).logStarted(this.getApplicationLog(), stopWatch);
            }

            listeners.started(context);
            this.callRunners(context, applicationArguments);
        } catch (Throwable var10) {
            this.handleRunFailure(context, var10, exceptionReporters, listeners);
            throw new IllegalStateException(var10);
        }

        try {
            listeners.running(context);
            return context;
        } catch (Throwable var9) {
            this.handleRunFailure(context, var9, exceptionReporters, (SpringApplicationRunListeners)null);
            throw new IllegalStateException(var9);
        }

this.callRunners(context, applicationArguments);

    private void callRunners(ApplicationContext context, ApplicationArguments args) {
        List<Object> runners = new ArrayList();
        runners.addAll(context.getBeansOfType(ApplicationRunner.class).values());
        runners.addAll(context.getBeansOfType(CommandLineRunner.class).values());
        AnnotationAwareOrderComparator.sort(runners);
        Iterator var4 = (new LinkedHashSet(runners)).iterator();

        while(var4.hasNext()) {
            Object runner = var4.next();
            if(runner instanceof ApplicationRunner) {
                this.callRunner((ApplicationRunner)runner, args);
            }

            if(runner instanceof CommandLineRunner) {
                this.callRunner((CommandLineRunner)runner, args);
            }
        }

    }

    private void callRunner(ApplicationRunner runner, ApplicationArguments args) {
        try {
            runner.run(args);
        } catch (Exception var4) {
            throw new IllegalStateException("Failed to execute ApplicationRunner", var4);
        }
    }

    private void callRunner(CommandLineRunner runner, ApplicationArguments args) {
        try {
            runner.run(args.getSourceArgs());
        } catch (Exception var4) {
            throw new IllegalStateException("Failed to execute CommandLineRunner", var4);
        }

通过runner.run(args);回调run方法，执行helloWorldService.getHelloMessage()