SpringBoot读取配置文件源码探究 (2)

在ConfigFileApplicationListener类中继续

@Override public void onApplicationEvent(ApplicationEvent event) { if (event instanceof ApplicationEnvironmentPreparedEvent) { //配置入口 onApplicationEnvironmentPreparedEvent( (ApplicationEnvironmentPreparedEvent) event); } if (event instanceof ApplicationPreparedEvent) { onApplicationPreparedEvent(event); } }

继续，可以看到处理器有这些，我们关注ConfigFileApplicationListener

private void onApplicationEnvironmentPreparedEvent( ApplicationEnvironmentPreparedEvent event) { List<EnvironmentPostProcessor> postProcessors = loadPostProcessors(); postProcessors.add(this); AnnotationAwareOrderComparator.sort(postProcessors); for (EnvironmentPostProcessor postProcessor : postProcessors) { //入口 postProcessor.postProcessEnvironment(event.getEnvironment(), event.getSpringApplication()); } } 1.2.5. postProcessEnvironment @Override public void postProcessEnvironment(ConfigurableEnvironment environment, SpringApplication application) { //重点入口 addPropertySources(environment, application.getResourceLoader()); configureIgnoreBeanInfo(environment); bindToSpringApplication(environment, application); }

继续

protected void addPropertySources(ConfigurableEnvironment environment, ResourceLoader resourceLoader) { RandomValuePropertySource.addToEnvironment(environment); //总算看到加载入口了 new Loader(environment, resourceLoader).load(); } 1.2.6. load public void load() { this.propertiesLoader = new PropertySourcesLoader(); this.activatedProfiles = false; this.profiles = Collections.asLifoQueue(new LinkedList<Profile>()); this.processedProfiles = new LinkedList<Profile>(); // Pre-existing active profiles set via Environment.setActiveProfiles() // are additional profiles and config files are allowed to add more if // they want to, so don't call addActiveProfiles() here. Set<Profile> initialActiveProfiles = initializeActiveProfiles(); this.profiles.addAll(getUnprocessedActiveProfiles(initialActiveProfiles)); if (this.profiles.isEmpty()) { for (String defaultProfileName : this.environment.getDefaultProfiles()) { Profile defaultProfile = new Profile(defaultProfileName, true); if (!this.profiles.contains(defaultProfile)) { this.profiles.add(defaultProfile); } } } // The default profile for these purposes is represented as null. We add it // last so that it is first out of the queue (active profiles will then // override any settings in the defaults when the list is reversed later). this.profiles.add(null); while (!this.profiles.isEmpty()) { Profile profile = this.profiles.poll(); for (String location : getSearchLocations()) { if (!location.endsWith("http://www.likecs.com/")) { // location is a filename already, so don't search for more // filenames load(location, null, profile); } else { for (String name : getSearchNames()) { //加载入口 load(location, name, profile); } } } this.processedProfiles.add(profile); } addConfigurationProperties(this.propertiesLoader.getPropertySources()); }

可以看到它的加载名从getSearchNames获取，那就看看这个方法

private Set<String> getSearchNames() { if (this.environment.containsProperty(CONFIG_NAME_PROPERTY)) { return asResolvedSet(this.environment.getProperty(CONFIG_NAME_PROPERTY), null); } return asResolvedSet(ConfigFileApplicationListener.this.names, DEFAULT_NAMES); }

CONFIG_NAME_PROPERTY值为spring.config.name，DEFAULT_NAMES值为application，所以可以看出application这个名字就是默认的配置名了，但也可以用spring.config.name属性来修改

其实到这一步，后面已经没难度了，可以想象，接下去应该是拼接出完整的路径，找到文件读取，还是走完流程把

继续

private void load(String location, String name, Profile profile) { String group = "profile=" + ((profile != null) ? profile : ""); if (!StringUtils.hasText(name)) { // Try to load directly from the location loadIntoGroup(group, location, profile); } else { // Search for a file with the given name for (String ext : this.propertiesLoader.getAllFileExtensions()) { if (profile != null) { // Try the profile-specific file loadIntoGroup(group, location + name + "-" + profile + "." + ext, null); for (Profile processedProfile : this.processedProfiles) { if (processedProfile != null) { loadIntoGroup(group, location + name + "-" + processedProfile + "." + ext, profile); } } // Sometimes people put "spring.profiles: dev" in // application-dev.yml (gh-340). Arguably we should try and error // out on that, but we can be kind and load it anyway. loadIntoGroup(group, location + name + "-" + profile + "." + ext, profile); } // Also try the profile-specific section (if any) of the normal file //加载重点 loadIntoGroup(group, location + name + "." + ext, profile); } } }