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
修饰符和类型类说明
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	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

所有方法实例方法具体方法
修饰符和类型	方法	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,
                                 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)
```

类 PropertyPlaceholderHelper

嵌套类概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

构造器详细资料

PropertyPlaceholderHelper

PropertyPlaceholderHelper

方法详细资料

replacePlaceholders

replacePlaceholders

parseStringValue