org.springframework.util

类 PropertyPlaceholderHelper

java.lang.Object

org.springframework.util.PropertyPlaceholderHelper

public class PropertyPlaceholderHelper
extends Object

Utility class for working with Strings that have placeholder values in them. A placeholder takes the form ${name}. Using PropertyPlaceholderHelper these placeholders can be substituted for user-supplied values.

Values for substitution can be supplied using a Properties instance or using a PropertyPlaceholderHelper.PlaceholderResolver.

从以下版本开始:

3.0

作者:

Juergen Hoeller, Rob Harrop

嵌套类概要

嵌套类

限定符和类型	类和说明
static interface	PropertyPlaceholderHelper.PlaceholderResolver Strategy interface used to resolve replacement values for placeholders contained in Strings.

构造器概要

构造器

构造器和说明
PropertyPlaceholderHelper(String placeholderPrefix, String placeholderSuffix) Creates a new PropertyPlaceholderHelper that uses the supplied prefix and suffix.
PropertyPlaceholderHelper(String placeholderPrefix, String placeholderSuffix, String valueSeparator, boolean ignoreUnresolvablePlaceholders) Creates a new PropertyPlaceholderHelper that uses the supplied prefix and suffix.

方法概要

限定符和类型	方法和说明
protected String	parseStringValue(String value, PropertyPlaceholderHelper.PlaceholderResolver placeholderResolver, Set<String> visitedPlaceholders)
String	replacePlaceholders(String value, Properties properties) Replaces all placeholders of format ${name} with the corresponding property from the supplied Properties.
String	replacePlaceholders(String value, PropertyPlaceholderHelper.PlaceholderResolver placeholderResolver) Replaces all placeholders of format ${name} with the value returned from the supplied PropertyPlaceholderHelper.PlaceholderResolver.

从类继承的方法 java.lang.Object

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

构造器详细资料

PropertyPlaceholderHelper

public PropertyPlaceholderHelper(String placeholderPrefix,
                                 String placeholderSuffix)

Creates a new PropertyPlaceholderHelper that uses the supplied prefix and suffix. Unresolvable placeholders are ignored.

参数:

placeholderPrefix - the prefix that denotes the start of a placeholder

placeholderSuffix - the suffix that denotes the end of a placeholder

PropertyPlaceholderHelper

public PropertyPlaceholderHelper(String placeholderPrefix,
                                 String placeholderSuffix,
                                 @Nullable
                                 String valueSeparator,
                                 boolean ignoreUnresolvablePlaceholders)

Creates a new PropertyPlaceholderHelper that uses the supplied prefix and suffix.

参数:

placeholderPrefix - the prefix that denotes the start of a placeholder

placeholderSuffix - the suffix that denotes the end of a placeholder

valueSeparator - the separating character between the placeholder variable and the associated default value, if any

ignoreUnresolvablePlaceholders - indicates whether unresolvable placeholders should be ignored (true) or cause an exception (false)

方法详细资料

replacePlaceholders

public String replacePlaceholders(String value,
                                  Properties properties)

Replaces all placeholders of format ${name} with the corresponding property from the supplied Properties.

参数:

value - the value containing the placeholders to be replaced

properties - the Properties to use for replacement

返回:

the supplied value with placeholders replaced inline

replacePlaceholders

public String replacePlaceholders(String value,
                                  PropertyPlaceholderHelper.PlaceholderResolver placeholderResolver)

Replaces all placeholders of format ${name} with the value returned from the supplied PropertyPlaceholderHelper.PlaceholderResolver.

参数:

value - the value containing the placeholders to be replaced

placeholderResolver - the PlaceholderResolver to use for replacement

返回:

the supplied value with placeholders replaced inline

parseStringValue

protected String parseStringValue(String value,
                                  PropertyPlaceholderHelper.PlaceholderResolver placeholderResolver,
                                  Set<String> visitedPlaceholders)