接口 PropertyResolver

方法详细资料

• containsProperty

  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.

• getProperty

  String getProperty​(String key)

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

  参数:

  key - the property name to resolve

  另请参阅:

  getProperty(String, String), getProperty(String, Class), getRequiredProperty(String)

• getProperty

  String getProperty​(String key,
                     String defaultValue)

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

  参数:

  key - the property name to resolve

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

  另请参阅:

  getRequiredProperty(String), getProperty(String, Class)

• getProperty

  <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.

  参数:

  key - the property name to resolve

  targetType - the expected type of the property value

  另请参阅:

  getRequiredProperty(String, Class)

• getProperty

  <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.

  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:

  getRequiredProperty(String, Class)

• getPropertyAsClass

  @Deprecated
  <T> Class<T> getPropertyAsClass​(String key,
                                  Class<T> targetType)

  已过时。

  as of 4.3, in favor of getProperty(java.lang.String) with manual conversion to Class via the application's ClassLoader
  Convert the property value associated with the given key to a Class of type T or null if the key cannot be resolved.

  抛出:

  ConversionException - if class specified by property value cannot be found or loaded or if targetType is not assignable from class specified by property value

  另请参阅:

  getProperty(String, Class)

• getRequiredProperty

  String getRequiredProperty​(String key)
                      throws IllegalStateException

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

  抛出:

  IllegalStateException - if the key cannot be resolved

  另请参阅:

  getRequiredProperty(String, Class)

• getRequiredProperty

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

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

  抛出:

  IllegalStateException - if the given key cannot be resolved

• resolvePlaceholders

  String resolvePlaceholders​(String text)

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

  参数:

  text - the String to resolve

  返回:

  the resolved String (never null)

  抛出:

  IllegalArgumentException - if given text is null

  另请参阅:

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

• resolveRequiredPlaceholders

  String resolveRequiredPlaceholders​(String text)
                              throws IllegalArgumentException

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

  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)