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# SpringBoot 启动方法
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- Author: [HuiFer](https://github.com/huifer)
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- 源码阅读仓库: [SourceHot-spring-boot](https://github.com/SourceHot/spring-boot-read)
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## 入口
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- 通常一个简单的 SpringBoot 基础项目我们会有如下代码
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```java
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@SpringBootApplication
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@RestController
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@RequestMapping("/")
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public class Application {
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public static void main(String[] args) {
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SpringApplication.run(Application.class, args);
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}
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}
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```
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- 值得关注的有`SpringApplication.run`以及注解`@SpringBootApplication`
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### run 方法
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```java
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public ConfigurableApplicationContext run(String... args) {
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// 秒表
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StopWatch stopWatch = new StopWatch();
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stopWatch.start();
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ConfigurableApplicationContext context = null;
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Collection<SpringBootExceptionReporter> exceptionReporters = new ArrayList<>();
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configureHeadlessProperty();
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// 获取监听器
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SpringApplicationRunListeners listeners = getRunListeners(args);
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// 监听器启动
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listeners.starting();
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try {
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// application 启动参数列表
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ApplicationArguments applicationArguments = new DefaultApplicationArguments(args);
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ConfigurableEnvironment environment = prepareEnvironment(listeners, applicationArguments);
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// 配置忽略的bean信息
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configureIgnoreBeanInfo(environment);
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Banner printedBanner = printBanner(environment);
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// 创建应用上下文
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context = createApplicationContext();
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exceptionReporters = getSpringFactoriesInstances(SpringBootExceptionReporter.class,
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new Class[] { ConfigurableApplicationContext.class }, context);
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// 准备上下文，装配bean
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prepareContext(context, environment, listeners, applicationArguments, printedBanner);
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// 上下文刷新
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refreshContext(context);
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// 刷新后做什么
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afterRefresh(context, applicationArguments);
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stopWatch.stop();
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if (this.logStartupInfo) {
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new StartupInfoLogger(this.mainApplicationClass).logStarted(getApplicationLog(), stopWatch);
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}
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// 监听器开始了
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listeners.started(context);
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// 唤醒
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callRunners(context, applicationArguments);
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}
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catch (Throwable ex) {
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handleRunFailure(context, ex, exceptionReporters, listeners);
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throw new IllegalStateException(ex);
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}
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try {
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// 监听器正式运行
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listeners.running(context);
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}
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catch (Throwable ex) {
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handleRunFailure(context, ex, exceptionReporters, null);
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throw new IllegalStateException(ex);
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}
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return context;
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}
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```
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### getRunListeners
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- 获取监听器
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```java
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private SpringApplicationRunListeners getRunListeners(String[] args) {
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Class<?>[] types = new Class<?>[] { SpringApplication.class, String[].class };
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// 获取 Spring Factory 实例对象
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return new SpringApplicationRunListeners(logger,
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getSpringFactoriesInstances(SpringApplicationRunListener.class, types, this, args));
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}
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private <T> Collection<T> getSpringFactoriesInstances(Class<T> type, Class<?>[] parameterTypes, Object... args) {
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ClassLoader classLoader = getClassLoader();
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// Use names and ensure unique to protect against duplicates
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// 读取 spring.factories
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Set<String> names = new LinkedHashSet<>(SpringFactoriesLoader.loadFactoryNames(type, classLoader));
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// 创建SpringFactory实例
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List<T> instances = createSpringFactoriesInstances(type, parameterTypes, classLoader, args, names);
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/**
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* 排序 {@link Ordered}
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*/
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AnnotationAwareOrderComparator.sort(instances);
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return instances;
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}
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```
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### createSpringFactoriesInstances
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```java
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@SuppressWarnings("unchecked")
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private <T> List<T> createSpringFactoriesInstances(Class<T> type, Class<?>[] parameterTypes,
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ClassLoader classLoader, Object[] args, Set<String> names) {
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// 初始化
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List<T> instances = new ArrayList<>(names.size());
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for (String name : names) {
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try {
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// 通过名字创建类的class对象
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Class<?> instanceClass = ClassUtils.forName(name, classLoader);
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Assert.isAssignable(type, instanceClass);
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// 构造器获取
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Constructor<?> constructor = instanceClass.getDeclaredConstructor(parameterTypes);
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// 创建具体实例
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T instance = (T) BeanUtils.instantiateClass(constructor, args);
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// 加入实例表中
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instances.add(instance);
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}
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catch (Throwable ex) {
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throw new IllegalArgumentException("Cannot instantiate " + type + " : " + name, ex);
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}
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}
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return instances;
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}
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```
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- `SpringFactoriesLoader.loadFactoryNames(type, classLoader)` 是 spring 提供的方法，主要目的是读取`spring.factories`文件
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- 读取需要创建的内容
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- 创建完成
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- `AnnotationAwareOrderComparator.sort(instances)`排序
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- 通过 spring 的源码我们知道这个方法是根据`order`的数字大小进行排序，观察
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`SharedMetadataReaderFactoryContextInitializer`
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- 同样的再找一个`DelegatingApplicationContextInitializer`
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- 下图中的所有类都有 Order 数值返回
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排序前:
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排序后：
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### listeners.starting()
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- `SpringApplicationRunListeners` : `org.springframework.boot.SpringApplicationRunListeners` 这个类是`org.springframework.boot.SpringApplicationRunListener`的集合表现形式
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```
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class SpringApplicationRunListeners {
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private final List<SpringApplicationRunListener> listeners;
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SpringApplicationRunListeners(Log log, Collection<? extends SpringApplicationRunListener> listeners) {
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this.log = log;
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this.listeners = new ArrayList<>(listeners);
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}
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void starting() {
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for (SpringApplicationRunListener listener : this.listeners) {
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listener.starting();
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}
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}
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}
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```
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- 这里主要是启动`org.springframework.boot.SpringApplicationRunListener#starting`方法，只有一个实现`org.springframework.boot.context.event.EventPublishingRunListener#starting`
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### prepareEnvironment
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```java
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private ConfigurableEnvironment prepareEnvironment(SpringApplicationRunListeners listeners,
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ApplicationArguments applicationArguments) {
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// Create and configure the environment
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// 得到一个环境
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ConfigurableEnvironment environment = getOrCreateEnvironment();
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// 配置环境
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configureEnvironment(environment, applicationArguments.getSourceArgs());
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ConfigurationPropertySources.attach(environment);
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listeners.environmentPrepared(environment);
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// 绑定springBoot应用
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bindToSpringApplication(environment);
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// 是否创建自定义环境
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if (!this.isCustomEnvironment) {
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environment = new EnvironmentConverter(getClassLoader()).convertEnvironmentIfNecessary(environment,
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deduceEnvironmentClass());
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}
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ConfigurationPropertySources.attach(environment);
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return environment;
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}
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```
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### configureIgnoreBeanInfo
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- 获取`spring.beaninfo.ignore`并且设置到环境信息中
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```java
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private void configureIgnoreBeanInfo(ConfigurableEnvironment environment) {
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if (System.getProperty(CachedIntrospectionResults.IGNORE_BEANINFO_PROPERTY_NAME) == null) {
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Boolean ignore = environment.getProperty("spring.beaninfo.ignore", Boolean.class, Boolean.TRUE);
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System.setProperty(CachedIntrospectionResults.IGNORE_BEANINFO_PROPERTY_NAME, ignore.toString());
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}
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}
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```
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### printBanner
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```java
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private Banner printBanner(ConfigurableEnvironment environment) {
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if (this.bannerMode == Banner.Mode.OFF) {
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return null;
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}
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ResourceLoader resourceLoader = (this.resourceLoader != null) ? this.resourceLoader
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: new DefaultResourceLoader(getClassLoader());
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// 创建打印器
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SpringApplicationBannerPrinter bannerPrinter = new SpringApplicationBannerPrinter(resourceLoader, this.banner);
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if (this.bannerMode == Mode.LOG) {
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// 输出
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return bannerPrinter.print(environment, this.mainApplicationClass, logger);
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}
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// 输出
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return bannerPrinter.print(environment, this.mainApplicationClass, System.out);
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}
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```
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```
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Banner print(Environment environment, Class<?> sourceClass, PrintStream out) {
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Banner banner = getBanner(environment);
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banner.printBanner(environment, sourceClass, out);
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return new PrintedBanner(banner, sourceClass);
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}
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```
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- 最终输出内容类：`org.springframework.boot.SpringBootBanner`
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```JAVA
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class SpringBootBanner implements Banner {
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private static final String[] BANNER = { "", " . ____ _ __ _ _",
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" /\\\\ / ___'_ __ _ _(_)_ __ __ _ \\ \\ \\ \\", "( ( )\\___ | '_ | '_| | '_ \\/ _` | \\ \\ \\ \\",
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" \\\\/ ___)| |_)| | | | | || (_| | ) ) ) )", " ' |____| .__|_| |_|_| |_\\__, | / / / /",
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" =========|_|==============|___/=/_/_/_/" };
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private static final String SPRING_BOOT = " :: Spring Boot :: ";
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private static final int STRAP_LINE_SIZE = 42;
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@Override
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public void printBanner(Environment environment, Class<?> sourceClass, PrintStream printStream) {
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for (String line : BANNER) {
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printStream.println(line);
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}
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String version = SpringBootVersion.getVersion();
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version = (version != null) ? " (v" + version + ")" : "";
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StringBuilder padding = new StringBuilder();
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while (padding.length() < STRAP_LINE_SIZE - (version.length() + SPRING_BOOT.length())) {
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padding.append(" ");
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}
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printStream.println(AnsiOutput.toString(AnsiColor.GREEN, SPRING_BOOT, AnsiColor.DEFAULT, padding.toString(),
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AnsiStyle.FAINT, version));
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printStream.println();
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}
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}
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```
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### createApplicationContext
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```JAVA
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protected ConfigurableApplicationContext createApplicationContext() {
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// 获取上下文类
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Class<?> contextClass = this.applicationContextClass;
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if (contextClass == null) {
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try {
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// 根据不同类型选择创建的实例
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switch (this.webApplicationType) {
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case SERVLET:
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contextClass = Class.forName(DEFAULT_SERVLET_WEB_CONTEXT_CLASS);
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break;
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case REACTIVE:
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contextClass = Class.forName(DEFAULT_REACTIVE_WEB_CONTEXT_CLASS);
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break;
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default:
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contextClass = Class.forName(DEFAULT_CONTEXT_CLASS);
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}
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}
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catch (ClassNotFoundException ex) {
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throw new IllegalStateException(
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"Unable create a default ApplicationContext, please specify an ApplicationContextClass", ex);
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}
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}
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return (ConfigurableApplicationContext) BeanUtils.instantiateClass(contextClass);
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}
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```
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- `this.applicationContextClass` 初始化方法
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```JAVA
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public SpringApplication(ResourceLoader resourceLoader, Class<?>... primarySources) {
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this.resourceLoader = resourceLoader;
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Assert.notNull(primarySources, "PrimarySources must not be null");
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this.primarySources = new LinkedHashSet<>(Arrays.asList(primarySources));
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// 设置 web应用类型
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this.webApplicationType = WebApplicationType.deduceFromClasspath();
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setInitializers((Collection) getSpringFactoriesInstances(ApplicationContextInitializer.class));
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setListeners((Collection) getSpringFactoriesInstances(ApplicationListener.class));
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this.mainApplicationClass = deduceMainApplicationClass();
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}
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```
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- `org.springframework.boot.WebApplicationType#deduceFromClasspath`
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```JAVA
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static WebApplicationType deduceFromClasspath() {
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if (ClassUtils.isPresent(WEBFLUX_INDICATOR_CLASS, null) && !ClassUtils.isPresent(WEBMVC_INDICATOR_CLASS, null)
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&& !ClassUtils.isPresent(JERSEY_INDICATOR_CLASS, null)) {
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return WebApplicationType.REACTIVE;
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}
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for (String className : SERVLET_INDICATOR_CLASSES) {
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if (!ClassUtils.isPresent(className, null)) {
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return WebApplicationType.NONE;
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}
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}
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return WebApplicationType.SERVLET;
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}
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```
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### exceptionReporters
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### prepareContext
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```JAVA
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private void prepareContext(ConfigurableApplicationContext context, ConfigurableEnvironment environment,
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SpringApplicationRunListeners listeners, ApplicationArguments applicationArguments, Banner printedBanner) {
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// 上下文中设置环境
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context.setEnvironment(environment);
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// 上下文处理
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postProcessApplicationContext(context);
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// 初始化
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applyInitializers(context);
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// 监听器中放入上下文
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listeners.contextPrepared(context);
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if (this.logStartupInfo) {
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logStartupInfo(context.getParent() == null);
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logStartupProfileInfo(context);
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}
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// Add boot specific singleton beans
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ConfigurableListableBeanFactory beanFactory = context.getBeanFactory();
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// 单例对象注册
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beanFactory.registerSingleton("springApplicationArguments", applicationArguments);
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if (printedBanner != null) {
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beanFactory.registerSingleton("springBootBanner", printedBanner);
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}
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if (beanFactory instanceof DefaultListableBeanFactory) {
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((DefaultListableBeanFactory) beanFactory)
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.setAllowBeanDefinitionOverriding(this.allowBeanDefinitionOverriding);
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}
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if (this.lazyInitialization) {
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context.addBeanFactoryPostProcessor(new LazyInitializationBeanFactoryPostProcessor());
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}
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// Load the sources
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Set<Object> sources = getAllSources();
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Assert.notEmpty(sources, "Sources must not be empty");
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// 加载上下文
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load(context, sources.toArray(new Object[0]));
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// 监听器做加载上下文操作
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listeners.contextLoaded(context);
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}
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```
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- `set`方法就不说了
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### postProcessApplicationContext
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```java
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protected void postProcessApplicationContext(ConfigurableApplicationContext context) {
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if (this.beanNameGenerator != null) {
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// 注册 beanName 的生成器
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context.getBeanFactory().registerSingleton(AnnotationConfigUtils.CONFIGURATION_BEAN_NAME_GENERATOR,
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this.beanNameGenerator);
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}
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if (this.resourceLoader != null) {
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if (context instanceof GenericApplicationContext) {
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// 设置资源加载器
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((GenericApplicationContext) context).setResourceLoader(this.resourceLoader);
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}
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if (context instanceof DefaultResourceLoader) {
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// 设置类加载器
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((DefaultResourceLoader) context).setClassLoader(this.resourceLoader.getClassLoader());
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}
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}
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if (this.addConversionService) {
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// 转换服务
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context.getBeanFactory().setConversionService(ApplicationConversionService.getSharedInstance());
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}
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}
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```
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- 看一下最终设置完成后的 context
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```java
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context.getBeanFactory().setConversionService(ApplicationConversionService.getSharedInstance());
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```
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### applyInitializers
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- 初始化应用上下文
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|
|
|
|
```java
|
|
|
@SuppressWarnings({ "rawtypes", "unchecked" })
|
|
|
protected void applyInitializers(ConfigurableApplicationContext context) {
|
|
|
for (ApplicationContextInitializer initializer : getInitializers()) {
|
|
|
Class<?> requiredType = GenericTypeResolver.resolveTypeArgument(initializer.getClass(),
|
|
|
ApplicationContextInitializer.class);
|
|
|
Assert.isInstanceOf(requiredType, context, "Unable to call initializer.");
|
|
|
initializer.initialize(context);
|
|
|
}
|
|
|
}
|
|
|
|
|
|
```
|
|
|
|
|
|
- 初始化 `List<ApplicationListener<?>> listeners`: `setInitializers((Collection) getSpringFactoriesInstances(ApplicationContextInitializer.class));`
|
|
|
|
|
|
- 获取 `List<ApplicationListener<?>> listeners`: `public Set<ApplicationListener<?>> getListeners() { return asUnmodifiableOrderedSet(this.listeners);}`
|
|
|
|
|
|
- 数据结果
|
|
|
|
|
|
|
|
|
|
|
|
- 子类的具体实现不展开了
|
|
|
|
|
|
### getAllSources
|
|
|
|
|
|
```java
|
|
|
public Set<Object> getAllSources() {
|
|
|
Set<Object> allSources = new LinkedHashSet<>();
|
|
|
if (!CollectionUtils.isEmpty(this.primarySources)) {
|
|
|
allSources.addAll(this.primarySources);
|
|
|
}
|
|
|
if (!CollectionUtils.isEmpty(this.sources)) {
|
|
|
allSources.addAll(this.sources);
|
|
|
}
|
|
|
return Collections.unmodifiableSet(allSources);
|
|
|
}
|
|
|
|
|
|
```
|
|
|
|
|
|
- `primarySources` 就是我们的项目启动类，在`SpringApplication`的构造器中有`this.primarySources = new LinkedHashSet<>(Arrays.asList(primarySources))`
|
|
|
|
|
|
|
|
|
|
|
|
### load
|
|
|
|
|
|
- 加载 bean 到应用上下文
|
|
|
|
|
|
```java
|
|
|
protected void load(ApplicationContext context, Object[] sources) {
|
|
|
if (logger.isDebugEnabled()) {
|
|
|
logger.debug("Loading source " + StringUtils.arrayToCommaDelimitedString(sources));
|
|
|
}
|
|
|
// bean定义加载器
|
|
|
BeanDefinitionLoader loader = createBeanDefinitionLoader(getBeanDefinitionRegistry(context), sources);
|
|
|
if (this.beanNameGenerator != null) {
|
|
|
// 设置 beanName生成器
|
|
|
loader.setBeanNameGenerator(this.beanNameGenerator);
|
|
|
}
|
|
|
if (this.resourceLoader != null) {
|
|
|
// 设置 资源加载器
|
|
|
loader.setResourceLoader(this.resourceLoader);
|
|
|
}
|
|
|
if (this.environment != null) {
|
|
|
// 设置环境
|
|
|
loader.setEnvironment(this.environment);
|
|
|
}
|
|
|
// 加载
|
|
|
loader.load();
|
|
|
}
|
|
|
|
|
|
```
|
|
|
|
|
|
```java
|
|
|
int load() {
|
|
|
int count = 0;
|
|
|
for (Object source : this.sources) {
|
|
|
count += load(source);
|
|
|
}
|
|
|
return count;
|
|
|
}
|
|
|
|
|
|
```
|
|
|
|
|
|
```java
|
|
|
private int load(Object source) {
|
|
|
Assert.notNull(source, "Source must not be null");
|
|
|
if (source instanceof Class<?>) {
|
|
|
return load((Class<?>) source);
|
|
|
}
|
|
|
if (source instanceof Resource) {
|
|
|
return load((Resource) source);
|
|
|
}
|
|
|
if (source instanceof Package) {
|
|
|
return load((Package) source);
|
|
|
}
|
|
|
if (source instanceof CharSequence) {
|
|
|
return load((CharSequence) source);
|
|
|
}
|
|
|
throw new IllegalArgumentException("Invalid source type " + source.getClass());
|
|
|
}
|
|
|
|
|
|
```
|
|
|
|
|
|
- 通过前文我们已经知道 `source`就是一个 class
|
|
|
|
|
|
|
|
|
|
|
|
```java
|
|
|
private int load(Class<?> source) {
|
|
|
if (isGroovyPresent() && GroovyBeanDefinitionSource.class.isAssignableFrom(source)) {
|
|
|
// Any GroovyLoaders added in beans{} DSL can contribute beans here
|
|
|
GroovyBeanDefinitionSource loader = BeanUtils.instantiateClass(source, GroovyBeanDefinitionSource.class);
|
|
|
load(loader);
|
|
|
}
|
|
|
// 是否为组件
|
|
|
if (isComponent(source)) {
|
|
|
this.annotatedReader.register(source);
|
|
|
return 1;
|
|
|
}
|
|
|
return 0;
|
|
|
}
|
|
|
|
|
|
```
|
|
|
|
|
|
- 我们的启动类是一个组件，直接注册完成返回 1
|
|
|
|
|
|
### listeners.contextLoaded(context)
|
|
|
|
|
|
- 监听器行为: 在上下文资源加载后做一些事情
|
|
|
|
|
|
### refreshContext
|
|
|
|
|
|
- 上下文刷新
|
|
|
|
|
|
```java
|
|
|
private void refreshContext(ConfigurableApplicationContext context) {
|
|
|
refresh(context);
|
|
|
if (this.registerShutdownHook) {
|
|
|
try {
|
|
|
context.registerShutdownHook();
|
|
|
}
|
|
|
catch (AccessControlException ex) {
|
|
|
// Not allowed in some environments.
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
```
|
|
|
|
|
|
```java
|
|
|
/**
|
|
|
* Refresh the underlying {@link ApplicationContext}.
|
|
|
* @param applicationContext the application context to refresh
|
|
|
*/
|
|
|
protected void refresh(ApplicationContext applicationContext) {
|
|
|
Assert.isInstanceOf(AbstractApplicationContext.class, applicationContext);
|
|
|
((AbstractApplicationContext) applicationContext).refresh();
|
|
|
}
|
|
|
```
|
|
|
|
|
|
- 最终来到了`org.springframework.context.support.AbstractApplicationContext#refresh`方法，此方法是 spring 的一个方法，此处不在阐述
|
|
|
|
|
|
### afterRefresh
|
|
|
|
|
|
- 刷新上下文之后做的事情,空的没有实现
|
|
|
|
|
|
```
|
|
|
protected void afterRefresh(ConfigurableApplicationContext context, ApplicationArguments args) {
|
|
|
}
|
|
|
|
|
|
```
|
|
|
|
|
|
### stopWatch.stop()
|
|
|
|
|
|
- 秒表结束
|
|
|
|
|
|
### listeners.started(context)
|
|
|
|
|
|
- 各类监听器启动
|
|
|
|
|
|
### callRunners
|
|
|
|
|
|
- 两种 runner 启动`ApplicationRunner` 和 `CommandLineRunner`
|
|
|
|
|
|
```JAVA
|
|
|
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);
|
|
|
for (Object runner : new LinkedHashSet<>(runners)) {
|
|
|
if (runner instanceof ApplicationRunner) {
|
|
|
callRunner((ApplicationRunner) runner, args);
|
|
|
}
|
|
|
if (runner instanceof CommandLineRunner) {
|
|
|
callRunner((CommandLineRunner) runner, args);
|
|
|
}
|
|
|
}
|
|
|
}
|
|
|
|
|
|
```
|
|
|
|
|
|
```JAVA
|
|
|
private void callRunner(ApplicationRunner runner, ApplicationArguments args) {
|
|
|
try {
|
|
|
(runner).run(args);
|
|
|
}
|
|
|
catch (Exception ex) {
|
|
|
throw new IllegalStateException("Failed to execute ApplicationRunner", ex);
|
|
|
}
|
|
|
}
|
|
|
```
|
|
|
|
|
|
### listeners.running(context)
|
|
|
|
|
|
- 监听器正式开始工作
|
