进入上一篇使用profile的load()方法（ConfigFileApplicationListener类中）
1、initializeProfiles();
1）进入initializeProfiles方法。初始化Profiles，将所有的profile增加到prifiles集合中
private void initializeProfiles() {
// The default profile for these purposes is represented as null. We add it
// first so that it is processed first and has lowest priority.
this.profiles.add(null);
Set<Profile> activatedViaProperty = getProfilesActivatedViaProperty();
this.profiles.addAll(getOtherActiveProfiles(activatedViaProperty));
// Any pre-existing active profiles set via property sources (e.g.
// System properties) take precedence over those added in config files.
addActiveProfiles(activatedViaProperty);
if (this.profiles.size() == 1) { // only has null profile
for (String defaultProfileName : this.environment.getDefaultProfiles()) {
Profile defaultProfile = new Profile(defaultProfileName, true);
this.profiles.add(defaultProfile);
}
}
}
2、load(profile, this::getPositiveProfileFilter, addToLoaded(MutablePropertySources::addLast, false));
遍历prifles，
第一个prifile为空，进入load方法
private void load(Profile profile, DocumentFilterFactory filterFactory, DocumentConsumer consumer) {
getSearchLocations().forEach((location) -> {
boolean isFolder = location.endsWith("/");
Set<String> names = isFolder ? getSearchNames() : NO_SEARCH_NAMES;
names.forEach((name) -> load(location, name, profile, filterFactory, consumer));
});
}
进入getSearchLocations方法，获得如下图，classpath:/等查询路径
然后遍历上一步获取的查询路径
进入names.forEach((name) -> load(location, name, profile, filterFactory, consumer))的load方法，name值为application
然后进入loadForFileExtension(loader, location + name, "." + fileExtension, profile, filterFactory, consumer);
最终进入load(loader, prefix + fileExtension, profile, profileFilter, consumer);这个方法
private void load(PropertySourceLoader loader, String location, Profile profile, DocumentFilter filter,
DocumentConsumer consumer) {
try {
Resource resource = this.resourceLoader.getResource(location);
if (resource == null || !resource.exists()) {
if (this.logger.isTraceEnabled()) {
StringBuilder description = getDescription("Skipped missing config ", location, resource,
profile);
this.logger.trace(description);
}
return;
}
if (!StringUtils.hasText(StringUtils.getFilenameExtension(resource.getFilename()))) {
if (this.logger.isTraceEnabled()) {
StringBuilder description = getDescription("Skipped empty config extension ", location,
resource, profile);
this.logger.trace(description);
}
return;
}
String name = "applicationConfig: [" + location + "]";
List<Document> documents = loadDocuments(loader, name, resource);
if (CollectionUtils.isEmpty(documents)) {
if (this.logger.isTraceEnabled()) {
StringBuilder description = getDescription("Skipped unloaded config ", location, resource,
profile);
this.logger.trace(description);
}
return;
}
List<Document> loaded = new ArrayList<>();
for (Document document : documents) {
if (filter.match(document)) {
addActiveProfiles(document.getActiveProfiles());
addIncludedProfiles(document.getIncludeProfiles());
loaded.add(document);
}
}
Collections.reverse(loaded);
if (!loaded.isEmpty()) {
loaded.forEach((document) -> consumer.accept(profile, document));
if (this.logger.isDebugEnabled()) {
StringBuilder description = getDescription("Loaded config file ", location, resource, profile);
this.logger.debug(description);
}
}
}
catch (Exception ex) {
throw new IllegalStateException("Failed to load property " + "source from location '" + location + "'",
ex);
}
}
然后进入List<Document> documents = loadDocuments(loader, name, resource);
private List<Document> loadDocuments(PropertySourceLoader loader, String name, Resource resource)
throws IOException {
DocumentsCacheKey cacheKey = new DocumentsCacheKey(loader, resource);
List<Document> documents = this.loadDocumentsCache.get(cacheKey);
if (documents == null) {
List<PropertySource<?>> loaded = loader.load(name, resource);
documents = asDocuments(loaded);
this.loadDocumentsCache.put(cacheKey, documents);
}
return documents;
}
进入List<PropertySource<?>> loaded = loader.load(name, resource); 加载后的属性如下图所示
3、resetEnvironmentProfiles(this.processedProfiles);
设置激活的prifile有哪些
private void resetEnvironmentProfiles(List<Profile> processedProfiles) {
String[] names = processedProfiles.stream()
.filter((profile) -> profile != null && !profile.isDefaultProfile()).map(Profile::getName)
.toArray(String[]::new);
this.environment.setActiveProfiles(names);
}
4、load(null, this::getNegativeProfileFilter, addToLoaded(MutablePropertySources::addFirst, true));
防止前面循环没有进入，load默认的profile
5、addLoadedPropertySources(); 将获得的profile的属性增加到属性源中
private void addLoadedPropertySources() {
MutablePropertySources destination = this.environment.getPropertySources();
List<MutablePropertySources> loaded = new ArrayList<>(this.loaded.values());
Collections.reverse(loaded);
String lastAdded = null;
Set<String> added = new HashSet<>();
for (MutablePropertySources sources : loaded) {
for (PropertySource<?> source : sources) {
if (added.add(source.getName())) {
addLoadedPropertySource(destination, lastAdded, source);
lastAdded = source.getName();
}
}
}
}
如下图所示
