org.springframework.core.env

类 AbstractEnvironment

java.lang.Object

org.springframework.core.env.AbstractEnvironment

所有已实现的接口:

ConfigurableEnvironment, ConfigurablePropertyResolver, Environment, PropertyResolver

直接已知子类:

StandardEnvironment

public abstract class AbstractEnvironment
extends Object
implements ConfigurableEnvironment

Abstract base class for Environment implementations. Supports the notion of reserved default profile names and enables specifying active and default profiles through the ACTIVE_PROFILES_PROPERTY_NAME and DEFAULT_PROFILES_PROPERTY_NAME properties.

Concrete subclasses differ primarily on which PropertySource objects they add by default. AbstractEnvironment adds none. Subclasses should contribute property sources through the protected customizePropertySources(MutablePropertySources) hook, while clients should customize using ConfigurableEnvironment.getPropertySources() and working against the MutablePropertySources API. See ConfigurableEnvironment javadoc for usage examples.

从以下版本开始:

3.1

作者:

Chris Beams, Juergen Hoeller

另请参阅:

ConfigurableEnvironment, StandardEnvironment

字段概要

字段

限定符和类型	字段和说明
static String	ACTIVE_PROFILES_PROPERTY_NAME Name of property to set to specify active profiles: "spring.profiles.active".
static String	DEFAULT_PROFILES_PROPERTY_NAME Name of property to set to specify profiles active by default: "spring.profiles.default".
static String	IGNORE_GETENV_PROPERTY_NAME System property that instructs Spring to ignore system environment variables, i.e. to never attempt to retrieve such a variable via System.getenv().
protected Log	logger
protected static String	RESERVED_DEFAULT_PROFILE_NAME Name of reserved default profile name: "default".

构造器概要

构造器

构造器和说明
AbstractEnvironment() Create a new Environment instance, calling back to customizePropertySources(MutablePropertySources) during construction to allow subclasses to contribute or manipulate PropertySource instances as appropriate.

方法概要

限定符和类型	方法和说明
boolean	acceptsProfiles(String... profiles) Return whether one or more of the given profiles is active or, in the case of no explicit active profiles, whether one or more of the given profiles is included in the set of default profiles.
void	addActiveProfile(String profile) Add a profile to the current set of active profiles.
boolean	containsProperty(String key) Return whether the given property key is available for resolution, i.e. if the value for the given key is not null.
protected void	customizePropertySources(MutablePropertySources propertySources) Customize the set of PropertySource objects to be searched by this Environment during calls to getProperty(String) and related methods.
protected Set<String>	doGetActiveProfiles() Return the set of active profiles as explicitly set through setActiveProfiles(java.lang.String...) or if the current set of active profiles is empty, check for the presence of the "spring.profiles.active" property and assign its value to the set of active profiles.
protected Set<String>	doGetDefaultProfiles() Return the set of default profiles explicitly set via setDefaultProfiles(String...) or if the current set of default profiles consists only of reserved default profiles, then check for the presence of the "spring.profiles.default" property and assign its value (if any) to the set of default profiles.
String[]	getActiveProfiles() Return the set of profiles explicitly made active for this environment.
ConfigurableConversionService	getConversionService() Return the ConfigurableConversionService used when performing type conversions on properties.
String[]	getDefaultProfiles() Return the set of profiles to be active by default when no active profiles have been set explicitly.
String	getProperty(String key) Return the property value associated with the given key, or null if the key cannot be resolved.
<T> T	getProperty(String key, Class<T> targetType) Return the property value associated with the given key, or null if the key cannot be resolved.
<T> T	getProperty(String key, Class<T> targetType, T defaultValue) Return the property value associated with the given key, or defaultValue if the key cannot be resolved.
String	getProperty(String key, String defaultValue) Return the property value associated with the given key, or defaultValue if the key cannot be resolved.
MutablePropertySources	getPropertySources() Return the PropertySources for this Environment in mutable form, allowing for manipulation of the set of PropertySource objects that should be searched when resolving properties against this Environment object.
String	getRequiredProperty(String key) Return the property value associated with the given key (never null).
<T> T	getRequiredProperty(String key, Class<T> targetType) Return the property value associated with the given key, converted to the given targetType (never null).
protected Set<String>	getReservedDefaultProfiles() Return the set of reserved default profile names.
Map<String,Object>	getSystemEnvironment() Return the value of System.getenv() if allowed by the current SecurityManager, otherwise return a map implementation that will attempt to access individual keys using calls to System.getenv(String).
Map<String,Object>	getSystemProperties() Return the value of System.getProperties() if allowed by the current SecurityManager, otherwise return a map implementation that will attempt to access individual keys using calls to System.getProperty(String).
protected boolean	isProfileActive(String profile) Return whether the given profile is active, or if active profiles are empty whether the profile should be active by default.
void	merge(ConfigurableEnvironment parent) Append the given parent environment's active profiles, default profiles and property sources to this (child) environment's respective collections of each.
String	resolvePlaceholders(String text) Resolve ${...} placeholders in the given text, replacing them with corresponding property values as resolved by PropertyResolver.getProperty(java.lang.String).
String	resolveRequiredPlaceholders(String text) Resolve ${...} placeholders in the given text, replacing them with corresponding property values as resolved by PropertyResolver.getProperty(java.lang.String).
void	setActiveProfiles(String... profiles) Specify the set of profiles active for this Environment.
void	setConversionService(ConfigurableConversionService conversionService) Set the ConfigurableConversionService to be used when performing type conversions on properties.
void	setDefaultProfiles(String... profiles) Specify the set of profiles to be made active by default if no other profiles are explicitly made active through setActiveProfiles(java.lang.String...).
void	setIgnoreUnresolvableNestedPlaceholders(boolean ignoreUnresolvableNestedPlaceholders) Set whether to throw an exception when encountering an unresolvable placeholder nested within the value of a given property.
void	setPlaceholderPrefix(String placeholderPrefix) Set the prefix that placeholders replaced by this resolver must begin with.
void	setPlaceholderSuffix(String placeholderSuffix) Set the suffix that placeholders replaced by this resolver must end with.
void	setRequiredProperties(String... requiredProperties) Specify which properties must be present, to be verified by ConfigurablePropertyResolver.validateRequiredProperties().
void	setValueSeparator(String valueSeparator) Specify the separating character between the placeholders replaced by this resolver and their associated default value, or null if no such special character should be processed as a value separator.
protected boolean	suppressGetenvAccess() Determine whether to suppress System.getenv()/System.getenv(String) access for the purposes of getSystemEnvironment().
String	toString()
protected void	validateProfile(String profile) Validate the given profile, called internally prior to adding to the set of active or default profiles.
void	validateRequiredProperties() Validate that each of the properties specified by ConfigurablePropertyResolver.setRequiredProperties(java.lang.String...) is present and resolves to a non-null value.

从类继承的方法 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

字段详细资料

IGNORE_GETENV_PROPERTY_NAME

public static final String IGNORE_GETENV_PROPERTY_NAME

System property that instructs Spring to ignore system environment variables, i.e. to never attempt to retrieve such a variable via System.getenv().

The default is "false", falling back to system environment variable checks if a Spring environment property (e.g. a placeholder in a configuration String) isn't resolvable otherwise. Consider switching this flag to "true" if you experience log warnings from getenv calls coming from Spring, e.g. on WebSphere with strict SecurityManager settings and AccessControlExceptions warnings.

另请参阅:

suppressGetenvAccess(), 常量字段值

ACTIVE_PROFILES_PROPERTY_NAME

public static final String ACTIVE_PROFILES_PROPERTY_NAME

Name of property to set to specify active profiles: "spring.profiles.active". Value may be comma delimited.

Note that certain shell environments such as Bash disallow the use of the period character in variable names. Assuming that Spring's SystemEnvironmentPropertySource is in use, this property may be specified as an environment variable as SPRING_PROFILES_ACTIVE.

另请参阅:

ConfigurableEnvironment.setActiveProfiles(java.lang.String...), 常量字段值

DEFAULT_PROFILES_PROPERTY_NAME

public static final String DEFAULT_PROFILES_PROPERTY_NAME

Name of property to set to specify profiles active by default: "spring.profiles.default". Value may be comma delimited.

Note that certain shell environments such as Bash disallow the use of the period character in variable names. Assuming that Spring's SystemEnvironmentPropertySource is in use, this property may be specified as an environment variable as SPRING_PROFILES_DEFAULT.

另请参阅:

ConfigurableEnvironment.setDefaultProfiles(java.lang.String...), 常量字段值

RESERVED_DEFAULT_PROFILE_NAME

protected static final String RESERVED_DEFAULT_PROFILE_NAME

Name of reserved default profile name: "default". If no default profile names are explicitly and no active profile names are explicitly set, this profile will automatically be activated by default.

另请参阅:

getReservedDefaultProfiles(), ConfigurableEnvironment.setDefaultProfiles(java.lang.String...), ConfigurableEnvironment.setActiveProfiles(java.lang.String...), DEFAULT_PROFILES_PROPERTY_NAME, ACTIVE_PROFILES_PROPERTY_NAME, 常量字段值

logger

protected final Log logger

构造器详细资料

AbstractEnvironment

public AbstractEnvironment()

Create a new Environment instance, calling back to customizePropertySources(MutablePropertySources) during construction to allow subclasses to contribute or manipulate PropertySource instances as appropriate.

另请参阅:

customizePropertySources(MutablePropertySources)

方法详细资料

customizePropertySources

protected void customizePropertySources(MutablePropertySources propertySources)

Customize the set of PropertySource objects to be searched by this Environment during calls to getProperty(String) and related methods.

Subclasses that override this method are encouraged to add property sources using MutablePropertySources.addLast(PropertySource) such that further subclasses may call super.customizePropertySources() with predictable results. For example:

 public class Level1Environment extends AbstractEnvironment {
     @Override
     protected void customizePropertySources(MutablePropertySources propertySources) {
         super.customizePropertySources(propertySources); // no-op from base class
         propertySources.addLast(new PropertySourceA(...));
         propertySources.addLast(new PropertySourceB(...));
     }
 }

 public class Level2Environment extends Level1Environment {
     @Override
     protected void customizePropertySources(MutablePropertySources propertySources) {
         super.customizePropertySources(propertySources); // add all from superclass
         propertySources.addLast(new PropertySourceC(...));
         propertySources.addLast(new PropertySourceD(...));
     }
 }
 

In this arrangement, properties will be resolved against sources A, B, C, D in that order. That is to say that property source "A" has precedence over property source "D". If the Level2Environment subclass wished to give property sources C and D higher precedence than A and B, it could simply call super.customizePropertySources after, rather than before adding its own:

 public class Level2Environment extends Level1Environment {
     @Override
     protected void customizePropertySources(MutablePropertySources propertySources) {
         propertySources.addLast(new PropertySourceC(...));
         propertySources.addLast(new PropertySourceD(...));
         super.customizePropertySources(propertySources); // add all from superclass
     }
 }
 

The search order is now C, D, A, B as desired.

Beyond these recommendations, subclasses may use any of the add*, remove, or replace methods exposed by MutablePropertySources in order to create the exact arrangement of property sources desired.

The base implementation registers no property sources.

Note that clients of any ConfigurableEnvironment may further customize property sources via the getPropertySources() accessor, typically within an ApplicationContextInitializer. For example:

 ConfigurableEnvironment env = new StandardEnvironment();
 env.getPropertySources().addLast(new PropertySourceX(...));
 

A warning about instance variable access

Instance variables declared in subclasses and having default initial values should not be accessed from within this method. Due to Java object creation lifecycle constraints, any initial value will not yet be assigned when this callback is invoked by the AbstractEnvironment() constructor, which may lead to a NullPointerException or other problems. If you need to access default values of instance variables, leave this method as a no-op and perform property source manipulation and instance variable access directly within the subclass constructor. Note that assigning values to instance variables is not problematic; it is only attempting to read default values that must be avoided.

另请参阅:

MutablePropertySources, PropertySourcesPropertyResolver, org.springframework.context.ApplicationContextInitializer

getReservedDefaultProfiles

protected Set<String> getReservedDefaultProfiles()

Return the set of reserved default profile names. This implementation returns "default". Subclasses may override in order to customize the set of reserved names.

另请参阅:

RESERVED_DEFAULT_PROFILE_NAME, doGetDefaultProfiles()

getActiveProfiles

public String[] getActiveProfiles()

从接口复制的说明: Environment

Return the set of profiles explicitly made active for this environment. Profiles are used for creating logical groupings of bean definitions to be registered conditionally, for example based on deployment environment. Profiles can be activated by setting "spring.profiles.active" as a system property or by calling ConfigurableEnvironment.setActiveProfiles(String...).

If no profiles have explicitly been specified as active, then any default profiles will automatically be activated.

指定者:

getActiveProfiles 在接口中 Environment

另请参阅:

Environment.getDefaultProfiles(), ConfigurableEnvironment.setActiveProfiles(java.lang.String...), ACTIVE_PROFILES_PROPERTY_NAME

doGetActiveProfiles

protected Set<String> doGetActiveProfiles()

Return the set of active profiles as explicitly set through setActiveProfiles(java.lang.String...) or if the current set of active profiles is empty, check for the presence of the "spring.profiles.active" property and assign its value to the set of active profiles.

另请参阅:

getActiveProfiles(), ACTIVE_PROFILES_PROPERTY_NAME

setActiveProfiles

public void setActiveProfiles(String... profiles)

从接口复制的说明: ConfigurableEnvironment

Specify the set of profiles active for this Environment. Profiles are evaluated during container bootstrap to determine whether bean definitions should be registered with the container.

Any existing active profiles will be replaced with the given arguments; call with zero arguments to clear the current set of active profiles. Use ConfigurableEnvironment.addActiveProfile(java.lang.String) to add a profile while preserving the existing set.

指定者:

setActiveProfiles 在接口中 ConfigurableEnvironment

另请参阅:

ConfigurableEnvironment.addActiveProfile(java.lang.String), ConfigurableEnvironment.setDefaultProfiles(java.lang.String...), org.springframework.context.annotation.Profile, ACTIVE_PROFILES_PROPERTY_NAME

addActiveProfile

public void addActiveProfile(String profile)

从接口复制的说明: ConfigurableEnvironment

Add a profile to the current set of active profiles.

指定者:

addActiveProfile 在接口中 ConfigurableEnvironment

另请参阅:

ConfigurableEnvironment.setActiveProfiles(java.lang.String...)

getDefaultProfiles

public String[] getDefaultProfiles()

从接口复制的说明: Environment

Return the set of profiles to be active by default when no active profiles have been set explicitly.

指定者:

getDefaultProfiles 在接口中 Environment

另请参阅:

Environment.getActiveProfiles(), ConfigurableEnvironment.setDefaultProfiles(java.lang.String...), DEFAULT_PROFILES_PROPERTY_NAME

doGetDefaultProfiles

protected Set<String> doGetDefaultProfiles()

Return the set of default profiles explicitly set via setDefaultProfiles(String...) or if the current set of default profiles consists only of reserved default profiles, then check for the presence of the "spring.profiles.default" property and assign its value (if any) to the set of default profiles.

另请参阅:

AbstractEnvironment(), getDefaultProfiles(), DEFAULT_PROFILES_PROPERTY_NAME, getReservedDefaultProfiles()

setDefaultProfiles

public void setDefaultProfiles(String... profiles)

Specify the set of profiles to be made active by default if no other profiles are explicitly made active through setActiveProfiles(java.lang.String...).

Calling this method removes overrides any reserved default profiles that may have been added during construction of the environment.

指定者:

setDefaultProfiles 在接口中 ConfigurableEnvironment

另请参阅:

AbstractEnvironment(), getReservedDefaultProfiles()

acceptsProfiles

public boolean acceptsProfiles(String... profiles)

从接口复制的说明: Environment

Return whether one or more of the given profiles is active or, in the case of no explicit active profiles, whether one or more of the given profiles is included in the set of default profiles. If a profile begins with '!' the logic is inverted, i.e. the method will return true if the given profile is not active. For example,

env.acceptsProfiles("p1", "!p2")

will return true if profile 'p1' is active or 'p2' is not active.

指定者:

acceptsProfiles 在接口中 Environment

另请参阅:

Environment.getActiveProfiles(), Environment.getDefaultProfiles()

isProfileActive

protected boolean isProfileActive(String profile)

Return whether the given profile is active, or if active profiles are empty whether the profile should be active by default.

抛出:

IllegalArgumentException - per validateProfile(String)

validateProfile

protected void validateProfile(String profile)

Validate the given profile, called internally prior to adding to the set of active or default profiles.

Subclasses may override to impose further restrictions on profile syntax.

抛出:

IllegalArgumentException - if the profile is null, empty, whitespace-only or begins with the profile NOT operator (!).

另请参阅:

acceptsProfiles(java.lang.String...), addActiveProfile(java.lang.String), setDefaultProfiles(java.lang.String...)

getPropertySources

public MutablePropertySources getPropertySources()

从接口复制的说明: ConfigurableEnvironment

Return the PropertySources for this Environment in mutable form, allowing for manipulation of the set of PropertySource objects that should be searched when resolving properties against this Environment object. The various MutablePropertySources methods such as addFirst, addLast, addBefore and addAfter allow for fine-grained control over property source ordering. This is useful, for example, in ensuring that certain user-defined property sources have search precedence over default property sources such as the set of system properties or the set of system environment variables.

指定者:

getPropertySources 在接口中 ConfigurableEnvironment

另请参阅:

customizePropertySources(org.springframework.core.env.MutablePropertySources)

getSystemProperties

public Map<String,Object> getSystemProperties()

从接口复制的说明: ConfigurableEnvironment

Return the value of System.getProperties() if allowed by the current SecurityManager, otherwise return a map implementation that will attempt to access individual keys using calls to System.getProperty(String).

Note that most Environment implementations will include this system properties map as a default PropertySource to be searched. Therefore, it is recommended that this method not be used directly unless bypassing other property sources is expressly intended.

Calls to Map.get(Object) on the Map returned will never throw IllegalAccessException; in cases where the SecurityManager forbids access to a property, null will be returned and an INFO-level log message will be issued noting the exception.

指定者:

getSystemProperties 在接口中 ConfigurableEnvironment

getSystemEnvironment

public Map<String,Object> getSystemEnvironment()

从接口复制的说明: ConfigurableEnvironment

Return the value of System.getenv() if allowed by the current SecurityManager, otherwise return a map implementation that will attempt to access individual keys using calls to System.getenv(String).

Note that most Environment implementations will include this system environment map as a default PropertySource to be searched. Therefore, it is recommended that this method not be used directly unless bypassing other property sources is expressly intended.

Calls to Map.get(Object) on the Map returned will never throw IllegalAccessException; in cases where the SecurityManager forbids access to a property, null will be returned and an INFO-level log message will be issued noting the exception.

指定者:

getSystemEnvironment 在接口中 ConfigurableEnvironment

suppressGetenvAccess

protected boolean suppressGetenvAccess()

Determine whether to suppress System.getenv()/System.getenv(String) access for the purposes of getSystemEnvironment().

If this method returns true, an empty dummy Map will be used instead of the regular system environment Map, never even trying to call getenv and therefore avoiding security manager warnings (if any).

The default implementation checks for the "spring.getenv.ignore" system property, returning true if its value equals "true" in any case.

另请参阅:

IGNORE_GETENV_PROPERTY_NAME, SpringProperties.getFlag(java.lang.String)

merge

public void merge(ConfigurableEnvironment parent)

从接口复制的说明: ConfigurableEnvironment

Append the given parent environment's active profiles, default profiles and property sources to this (child) environment's respective collections of each.

For any identically-named PropertySource instance existing in both parent and child, the child instance is to be preserved and the parent instance discarded. This has the effect of allowing overriding of property sources by the child as well as avoiding redundant searches through common property source types, e.g. system environment and system properties.

Active and default profile names are also filtered for duplicates, to avoid confusion and redundant storage.

The parent environment remains unmodified in any case. Note that any changes to the parent environment occurring after the call to merge will not be reflected in the child. Therefore, care should be taken to configure parent property sources and profile information prior to calling merge.

指定者:

merge 在接口中 ConfigurableEnvironment

参数:

parent - the environment to merge with

另请参阅:

org.springframework.context.support.AbstractApplicationContext#setParent

getConversionService

public ConfigurableConversionService getConversionService()

从接口复制的说明: ConfigurablePropertyResolver

Return the ConfigurableConversionService used when performing type conversions on properties.

The configurable nature of the returned conversion service allows for the convenient addition and removal of individual Converter instances:

 ConfigurableConversionService cs = env.getConversionService();
 cs.addConverter(new FooConverter());
 

指定者:

getConversionService 在接口中 ConfigurablePropertyResolver

另请参阅:

PropertyResolver.getProperty(String, Class), ConverterRegistry.addConverter(org.springframework.core.convert.converter.Converter<?, ?>)

setConversionService

public void setConversionService(ConfigurableConversionService conversionService)

从接口复制的说明: ConfigurablePropertyResolver

Set the ConfigurableConversionService to be used when performing type conversions on properties.

Note: as an alternative to fully replacing the ConversionService, consider adding or removing individual Converter instances by drilling into ConfigurablePropertyResolver.getConversionService() and calling methods such as #addConverter.

指定者:

setConversionService 在接口中 ConfigurablePropertyResolver

另请参阅:

PropertyResolver.getProperty(String, Class), ConfigurablePropertyResolver.getConversionService(), ConverterRegistry.addConverter(org.springframework.core.convert.converter.Converter<?, ?>)

setPlaceholderPrefix

public void setPlaceholderPrefix(String placeholderPrefix)

从接口复制的说明: ConfigurablePropertyResolver

Set the prefix that placeholders replaced by this resolver must begin with.

指定者:

setPlaceholderPrefix 在接口中 ConfigurablePropertyResolver

setPlaceholderSuffix

public void setPlaceholderSuffix(String placeholderSuffix)

从接口复制的说明: ConfigurablePropertyResolver

Set the suffix that placeholders replaced by this resolver must end with.

指定者:

setPlaceholderSuffix 在接口中 ConfigurablePropertyResolver

setValueSeparator

public void setValueSeparator(@Nullable
                              String valueSeparator)

从接口复制的说明: ConfigurablePropertyResolver

Specify the separating character between the placeholders replaced by this resolver and their associated default value, or null if no such special character should be processed as a value separator.

指定者:

setValueSeparator 在接口中 ConfigurablePropertyResolver

setIgnoreUnresolvableNestedPlaceholders

public void setIgnoreUnresolvableNestedPlaceholders(boolean ignoreUnresolvableNestedPlaceholders)

从接口复制的说明: ConfigurablePropertyResolver

Set whether to throw an exception when encountering an unresolvable placeholder nested within the value of a given property. A false value indicates strict resolution, i.e. that an exception will be thrown. A true value indicates that unresolvable nested placeholders should be passed through in their unresolved ${...} form.

Implementations of PropertyResolver.getProperty(String) and its variants must inspect the value set here to determine correct behavior when property values contain unresolvable placeholders.

指定者:

setIgnoreUnresolvableNestedPlaceholders 在接口中 ConfigurablePropertyResolver

setRequiredProperties

public void setRequiredProperties(String... requiredProperties)

从接口复制的说明: ConfigurablePropertyResolver

Specify which properties must be present, to be verified by ConfigurablePropertyResolver.validateRequiredProperties().

指定者:

setRequiredProperties 在接口中 ConfigurablePropertyResolver

validateRequiredProperties

public void validateRequiredProperties()
                                throws MissingRequiredPropertiesException

从接口复制的说明: ConfigurablePropertyResolver

Validate that each of the properties specified by ConfigurablePropertyResolver.setRequiredProperties(java.lang.String...) is present and resolves to a non-null value.

指定者:

validateRequiredProperties 在接口中 ConfigurablePropertyResolver

抛出:

MissingRequiredPropertiesException - if any of the required properties are not resolvable.

containsProperty

public boolean containsProperty(String key)

从接口复制的说明: PropertyResolver

Return whether the given property key is available for resolution, i.e. if the value for the given key is not null.

指定者:

containsProperty 在接口中 PropertyResolver

getProperty

@Nullable
public String getProperty(String key)

从接口复制的说明: PropertyResolver

Return the property value associated with the given key, or null if the key cannot be resolved.

指定者:

getProperty 在接口中 PropertyResolver

参数:

key - the property name to resolve

另请参阅:

PropertyResolver.getProperty(String, String), PropertyResolver.getProperty(String, Class), PropertyResolver.getRequiredProperty(String)

getProperty

public String getProperty(String key,
                          String defaultValue)

从接口复制的说明: PropertyResolver

Return the property value associated with the given key, or defaultValue if the key cannot be resolved.

指定者:

getProperty 在接口中 PropertyResolver

参数:

key - the property name to resolve

defaultValue - the default value to return if no value is found

另请参阅:

PropertyResolver.getRequiredProperty(String), PropertyResolver.getProperty(String, Class)

getProperty

@Nullable
public <T> T getProperty(String key,
                                    Class<T> targetType)

从接口复制的说明: PropertyResolver

Return the property value associated with the given key, or null if the key cannot be resolved.

指定者:

getProperty 在接口中 PropertyResolver

参数:

key - the property name to resolve

targetType - the expected type of the property value

另请参阅:

PropertyResolver.getRequiredProperty(String, Class)

getProperty

public <T> T getProperty(String key,
                         Class<T> targetType,
                         T defaultValue)

从接口复制的说明: PropertyResolver

Return the property value associated with the given key, or defaultValue if the key cannot be resolved.

指定者:

getProperty 在接口中 PropertyResolver

参数:

key - the property name to resolve

targetType - the expected type of the property value

defaultValue - the default value to return if no value is found

另请参阅:

PropertyResolver.getRequiredProperty(String, Class)

getRequiredProperty

public String getRequiredProperty(String key)
                           throws IllegalStateException

从接口复制的说明: PropertyResolver

Return the property value associated with the given key (never null).

指定者:

getRequiredProperty 在接口中 PropertyResolver

抛出:

IllegalStateException - if the key cannot be resolved

另请参阅:

PropertyResolver.getRequiredProperty(String, Class)

getRequiredProperty

public <T> T getRequiredProperty(String key,
                                 Class<T> targetType)
                          throws IllegalStateException

从接口复制的说明: PropertyResolver

Return the property value associated with the given key, converted to the given targetType (never null).

指定者:

getRequiredProperty 在接口中 PropertyResolver

抛出:

IllegalStateException - if the given key cannot be resolved

resolvePlaceholders

public String resolvePlaceholders(String text)

从接口复制的说明: PropertyResolver

Resolve ${...} placeholders in the given text, replacing them with corresponding property values as resolved by PropertyResolver.getProperty(java.lang.String). Unresolvable placeholders with no default value are ignored and passed through unchanged.

指定者:

resolvePlaceholders 在接口中 PropertyResolver

参数:

text - the String to resolve

返回:

the resolved String (never null)

另请参阅:

PropertyResolver.resolveRequiredPlaceholders(java.lang.String), SystemPropertyUtils.resolvePlaceholders(String)

resolveRequiredPlaceholders

public String resolveRequiredPlaceholders(String text)
                                   throws IllegalArgumentException

从接口复制的说明: PropertyResolver

Resolve ${...} placeholders in the given text, replacing them with corresponding property values as resolved by PropertyResolver.getProperty(java.lang.String). Unresolvable placeholders with no default value will cause an IllegalArgumentException to be thrown.

指定者:

resolveRequiredPlaceholders 在接口中 PropertyResolver

返回:

the resolved String (never null)

抛出:

IllegalArgumentException - if given text is null or if any placeholders are unresolvable

另请参阅:

SystemPropertyUtils.resolvePlaceholders(String, boolean)

toString

public String toString()

覆盖:

toString 在类中 Object