java.lang.Object
- org.springframework.util.SystemPropertyUtils

```
public abstract class SystemPropertyUtils
extends Object
```
Helper class for resolving placeholders in texts. Usually applied to file paths.
A text may contain ${...} placeholders, to be resolved as system properties: e.g. ${user.dir}. Default values can be supplied using the ":" separator between key and value.
从以下版本开始:
1.2.5
作者:
Juergen Hoeller, Rob Harrop, Dave Syer
另请参阅:
PLACEHOLDER_PREFIX, PLACEHOLDER_SUFFIX, System.getProperty(String)

字段概要

字段
修饰符和类型	字段	说明
`static String`	`PLACEHOLDER_PREFIX`	Prefix for system property placeholders: "${"
`static String`	`PLACEHOLDER_SUFFIX`	Suffix for system property placeholders: "}"
`static String`	`VALUE_SEPARATOR`	Value separator for system property placeholders: ":"

构造器概要
构造器
构造器说明
SystemPropertyUtils()

方法概要

所有方法静态方法具体方法
修饰符和类型	方法	说明
`static String`	`resolvePlaceholders(String text)`	Resolve `${...}` placeholders in the given text, replacing them with corresponding system property values.
`static String`	`resolvePlaceholders(String text, boolean ignoreUnresolvablePlaceholders)`	Resolve `${...}` placeholders in the given text, replacing them with corresponding system property values.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - PLACEHOLDER_PREFIX
```
public static final String PLACEHOLDER_PREFIX
```
    Prefix for system property placeholders: "${"
    另请参阅:
    常量字段值
  - PLACEHOLDER_SUFFIX
```
public static final String PLACEHOLDER_SUFFIX
```
    Suffix for system property placeholders: "}"
    另请参阅:
    常量字段值
  - VALUE_SEPARATOR
```
public static final String VALUE_SEPARATOR
```
    Value separator for system property placeholders: ":"
    另请参阅:
    常量字段值
- 构造器详细资料
  - SystemPropertyUtils
```
public SystemPropertyUtils()
```
- 方法详细资料
  - resolvePlaceholders
```
public static String resolvePlaceholders(String text)
```
    Resolve ${...} placeholders in the given text, replacing them with corresponding system property values.
    参数:
    text - the String to resolve
    返回:
    the resolved String
    抛出:
    IllegalArgumentException - if there is an unresolvable placeholder
    另请参阅:
    PLACEHOLDER_PREFIX, PLACEHOLDER_SUFFIX
  - resolvePlaceholders
```
public static String resolvePlaceholders(String text,
                                         boolean ignoreUnresolvablePlaceholders)
```
    Resolve ${...} placeholders in the given text, replacing them with corresponding system property values. Unresolvable placeholders with no default value are ignored and passed through unchanged if the flag is set to true.
    参数:
    text - the String to resolve
    ignoreUnresolvablePlaceholders - whether unresolved placeholders are to be ignored
    返回:
    the resolved String
    抛出:
    IllegalArgumentException - if there is an unresolvable placeholder and the "ignoreUnresolvablePlaceholders" flag is false
    另请参阅:
    PLACEHOLDER_PREFIX, PLACEHOLDER_SUFFIX

类 SystemPropertyUtils

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

PLACEHOLDER_PREFIX

PLACEHOLDER_SUFFIX

VALUE_SEPARATOR

构造器详细资料

SystemPropertyUtils

方法详细资料

resolvePlaceholders

resolvePlaceholders