从SpringApplication实例化，到调用run方法，触发ApplicationStartingEvent事件，触发ApplicationEnvironmentPreparedEvent事件，environment对象中已经存储了一些配置数据，这里以servlet为例。
ApplicationServletEnvironment
{
"__type__": "ApplicationServletEnvironment",
"__super__": {
"__type__": "StandardServletEnvironment",
"__super__": {
"__type__": "StandardEnvironment",
"__super__": {
"__type__": "AbstractEnvironment",
"IGNORE_GETENV_PROPERTY_NAME": "spring.getenv.ignore",
"ACTIVE_PROFILES_PROPERTY_NAME": "spring.profiles.active",
"DEFAULT_PROFILES_PROPERTY_NAME": "spring.profiles.default",
"RESERVED_DEFAULT_PROFILE_NAME": "default",
"logger": {
"__type__": "Log"
},
"activeProfiles": [],
"defaultProfiles": [ "default" ],
"propertySources": {
"__type__": "MutablePropertySources",
"propertySourceList": [
{
"__type__": "ConfigurationPropertySourcesPropertySource",
"__super__": {
"__type__": "PropertySource",
"name": "configurationProperties",
"source": {
"__type__": "SpringConfigurationPropertySources",
"sources": "@AbstractEnvironment.propertySources"
}
}
},
{
"__type__": "SimpleCommandLinePropertySource",
"__super__": {
"__type__": "CommandLinePropertySource",
"__super__": {
"__type__": "EnumerablePropertySource",
"__super__": {
"__type__": "PropertySource",
"name": "commandLineArgs",
"source": {
"__type__": "CommandLineArgs",
"optionArgs": {},
"nonOptionArgs": []
}
}
},
"COMMAND_LINE_PROPERTY_SOURCE_NAME": "commandLineArgs",
"DEFAULT_NON_OPTION_ARGS_PROPERTY_NAME": "nonOptionArgs",
"nonOptionArgsPropertyName": "nonOptionArgs"
}
},
{
"__type__": "StubPropertySource",
"__super__": {
"__type__": "PropertySource",
"name": "servletConfigInitParams",
"source": {}
}
},
{
"__type__": "StubPropertySource",
"__super__": {
"__type__": "PropertySource",
"name": "servletContextInitParams",
"source": {}
}
},
{
"__type__": "PropertiesPropertySource",
"__super__": {
"__type__": "MapPropertySource",
"__super__": {
"__type__": "EnumerablePropertySource",
"__super__": {
"__type__": "PropertySource",
"name": "systemProperties",
"source": "对象，JVM系统变量"
}
}
}
},
{
"__type__": "OriginAwareSystemEnvironmentPropertySource",
"__super__": {
"__type__": "SystemEnvironmentPropertySource",
"__super__": {
"__type__": "MapPropertySource",
"__super__": {
"__type__": "EnumerablePropertySource",
"__super__": {
"__type__": "PropertySource",
"name": "systemEnvironment",
"source": "对象，操作系统变量"
}
}
}
},
"prefix": null
},
{
"__type__": "RandomValuePropertySource",
"RANDOM_PROPERTY_SOURCE_NAME": "random",
"PREFIX": "random.",
"__super__": {
"__type__": "PropertySource",
"name": "random",
"source": {
"__type__": "Random"
}
}
}
]
},
"propertyResolver": {
"__type__": "PropertySourcesPropertyResolver",
"__super__": {
"__type__": "AbstractPropertyResolver",
"logger": {
"__type__": "Log",
"conversionService": {
"__type__": "ApplicationConversionService",
"__super__": {
"__type__": "FormattingConversionService",
"__super__": {
"__type__": "GenericConversionService",
"NO_OP_CONVERTER": {
"__type__": "NoOpConverter",
"name": "NO_OP"
},
"NO_MATCH": {
"__type__": "NoOpConverter",
"name": "NO_MATCH"
},
"converters": {
"__type__": "Converters",
"globalConverters": [],
"converters": {}
},
"converterCache": {}
},
"embeddedValueResolver": null,
"cachedPrinters": {},
"cachedParsers": {}
},
"sharedInstance": null,
"unmodifiable": false,
},
"nonStrictHelper": null,
"strictHelper": null,
"ignoreUnresolvableNestedPlaceholders": false,
"placeholderPrefix": "${",
"placeholderSuffix": "}",
"valueSeparator": ":",
"requiredProperties": [],
}
},
"propertySources": "@AbstractEnvironment.propertySources"
}
},
"SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME": "systemEnvironment",
"SYSTEM_PROPERTIES_PROPERTY_SOURCE_NAME": "systemProperties",
},
"SERVLET_CONTEXT_PROPERTY_SOURCE_NAME": "servletContextInitParams",
"SERVLET_CONFIG_PROPERTY_SOURCE_NAME": "servletConfigInitParams",
"JNDI_PROPERTY_SOURCE_NAME": "jndiProperties",
"jndiPresent": false
}
}
propertySources中共有5个配置集合，带顺序
| 配置集合 | 说明 |
|---|---|
configurationProperties | 指向propertySources对象 |
commandLineArgs | 命令行参数 |
servletConfigInitParams | servletConfig配置参数，当前占位 |
servletContextInitParams | servletContext配置参数，当前占位 |
systemProperties | JVM环境变量 |
systemEnvironment | 操作系统环境变量 |
random | 一个Random实例 |
另外还有
云平台的配置集合，名称是vcap
jndi配置集合，名称是jndiProperties
spring.application.json的配置集合，名称是spring.application.json
ConfigDataEnvironment
这个对象的processAndApply方法，涉及点过多，要读懂，得一个类以个类理解。
整理涉及到的类
{
"__type__": "ConfigDataEnvironment",
"LOCATION_PROPERTY": "spring.config.location",
"ADDITIONAL_LOCATION_PROPERTY": "spring.config.additional-location",
"IMPORT_PROPERTY": "spring.config.import",
"ON_NOT_FOUND_PROPERTY": "spring.config.on-not-found",
"DEFAULT_SEARCH_LOCATIONS": [
{
"__type__": "ConfigDataLocation",
"OPTIONAL_PREFIX": "optional:",
"optional": true,
"value": "classpath:/;optional:classpath:/config/",
"origin": null
},
{
"__type__": "ConfigDataLocation",
"OPTIONAL_PREFIX": "optional:",
"optional": true,
"value": "file:./;optional:file:./config/;optional:file:./config/*/",
"origin": null
}
],
"EMPTY_LOCATIONS": [],
"CONFIG_DATA_LOCATION_ARRAY": {
"__type__": "Bindable"
},
"STRING_LIST": {
"__type__": "Bindable"
},
"ALLOW_INACTIVE_BINDING": [],
"DENY_INACTIVE_BINDING": [
{
"__type__": "BinderOption.FAIL_ON_BIND_TO_INACTIVE_SOURCE"
}
],
"logFactory": "@ConfigDataEnvironmentPostProcessor.logFactory",
"logger": {
"__type__": "DeferredLog",
"destinationSupplier": "() -> LogFactory.getLog(org.springframework.boot.context.config.ConfigDataEnvironment)",
"lines": {
"__type__": "Lines",
"lines": []
}
},
"notFoundAction": {
"__type__": "BindResult"
},
"bootstrapContext": "@ConfigDataEnvironmentPostProcessor.bootstrapContext",
"environment": "ApplicationServletEnvironment",
"resolvers": {
"__type__": "ConfigDataLocationResolvers",
"resolvers": [
{
"__type__": "ConfigTreeConfigDataLocationResolver",
"PREFIX": "configtree:",
"resourceLoader": {
"__type__": "LocationResourceLoader",
"EMPTY_RESOURCES": [],
"FILE_PATH_COMPARATOR": {},
"FILE_NAME_COMPARATOR": {},
"resourceLoader": {
"__type__": "DefaultResourceLoader",
"classLoader": null,
"protocolResolvers": [],
"resourceCaches": {}
}
}
},
{
"__type__": "StandardConfigDataLocationResolver",
"PREFIX": "resource:",
"CONFIG_NAME_PROPERTY": "spring.config.name",
"DEFAULT_CONFIG_NAMES": [ "application" ],
"URL_PREFIX": {
"__type__": "Pattern",
"pattern": "^([a-zA-Z][a-zA-Z0-9*]*?:)(.*$)",
"flags": 0
},
"EXTENSION_HINT_PATTERN": {
"__type__": "Pattern",
"pattern": "^(.*)\\[(\\.\\w+)\\](?!\\[)$",
"flags": 0
},
"NO_PROFILE": null,
"logger": {
"__type__": "DeferredLog",
"destinationSupplier": "() -> LogFactory.getLog(org.springframework.boot.context.config.StandardConfigDataLocationResolver)",
"lines": {
"__type__": "Lines",
"lines": []
}
},
"propertySourceLoaders": [
{
"__type__": "PropertiesPropertySourceLoader",
"XML_FILE_EXTENSION": ".xml"
},
{
"__type__": "YamlPropertySourceLoader",
}
],
"configNames": [ "application" ],
"resourceLoader": {
"__type__": "LocationResourceLoader",
"EMPTY_RESOURCES": [],
"FILE_PATH_COMPARATOR": {},
"FILE_NAME_COMPARATOR": {},
"resourceLoader": {
"__type__": "DefaultResourceLoader",
"classLoader": null,
"protocolResolvers": [],
"resourceCaches": {}
}
},
}
]
},
"additionalProfiles": null,
"environmentUpdateListener": {
"__type__": "ConfigDataEnvironmentUpdateListener"
},
"loaders": {
"__type__": "ConfigDataLoaders",
"logger": {
"__type__": "DeferredLog",
"destinationSupplier": "() -> LogFactory.getLog(org.springframework.boot.context.config.ConfigTreeConfigDataLoader)",
"lines": {
"__type__": "Lines",
"lines": []
}
},
"loaders": [
{
"__type__": "ConfigTreeConfigDataLoader"
},
{
"__type__": "StandardConfigDataLoader"
}
],
"resourceTypes": [ "ConfigTreeConfigDataLoader", "StandardConfigDataLoader" ]
},
"contributors": null
}
Binder
{
"__type__": "Binder",
"NON_BEAN_CLASSES": [ "Object.class", "Class.class" ],
"sources": "@ConfigurationPropertySourcesPropertySource.source",
"placeholdersResolver": {
"__type__": "PropertySourcesPlaceholdersResolver",
"sources": "@ConfigurationPropertySourcesPropertySource.source",
"helper": {
"__type__": "PropertyPlaceholderHelper",
"logger": "org.springframework.util.PropertyPlaceholderHelper",
"wellKnownSimplePrefixes": {
"}": "{",
"]": "[",
")": "("
},
"placeholderPrefix": "${",
"placeholderSuffix": "}",
"simplePrefix": "${",
"valueSeparator": ":",
"ignoreUnresolvablePlaceholders": true
}
},
"bindConverter": {
"__type__": "BindConverter",
"sharedInstance": "BindConverter",
"delegates": [
{
"__type__": "TypeConverterConversionService",
"__super__": {
"__type__": "GenericConversionService"
}
},
{
"__type__": "ApplicationConversionService",
"__super__": {
"__type__": "FormattingConversionService",
"__super__": {
"__type__": "GenericConversionService",
"NO_OP_CONVERTER": {
"__type__": "NoOpConverter",
"name": "NO_OP"
},
"NO_MATCH": {
"__type__": "NoOpConverter",
"name": "NO_MATCH"
},
"converters": {
"__type__": "Converters",
"globalConverters": [],
"converters": {}
},
"converterCache": {}
},
"embeddedValueResolver": null,
"cachedPrinters": {},
"cachedParsers": {}
},
"sharedInstance": "ApplicationConversionService",
"unmodifiable": true,
}
]
},
"defaultBindHandler": {
"__type__": "BindHandler"
},
"dataObjectBinders": [
{
"__type__": "ValueObjectBinder",
"constructorProvider": {
"__type__": "DefaultBindConstructorProvider"
}
},
{
"__type__": "JavaBeanBinder"
}
]
}
ConfigurationPropertyName
这个类里面有两个静态内部类
Elements ElementsParser
ElementsParser会把配置名称解析为Elements
比如spring.config.on-not-found，会被解析成
start = [ 0, 7, 14 ]
end = [ 6, 13, 26 ]
size = 3
也就是解析成三个token，方便查找和替换。
这个解析器也支持中括号[ ]，里面可以是数字索引，也可以是属性名。