今天在看1
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```Java
/**
* Name of property to set to specify active profiles: {@value}. Value may be comma
* delimited.
* <p>Note that certain shell environments such as Bash disallow the use of the period
* character in variable names. Assuming that Spring's {@link SystemEnvironmentPropertySource}
* is in use, this property may be specified as an environment variable as
* {@code SPRING_PROFILES_ACTIVE}.
* @see ConfigurableEnvironment#setActiveProfiles
*/
public static final String ACTIVE_PROFILES_PROPERTY_NAME = "spring.profiles.active";
/**
* Name of property to set to specify profiles active by default: {@value}. Value may
* be comma delimited.
* <p>Note that certain shell environments such as Bash disallow the use of the period
* character in variable names. Assuming that Spring's {@link SystemEnvironmentPropertySource}
* is in use, this property may be specified as an environment variable as
* {@code SPRING_PROFILES_DEFAULT}.
* @see ConfigurableEnvironment#setDefaultProfiles
*/
public static final String DEFAULT_PROFILES_PROPERTY_NAME = "spring.profiles.default";
这里面的1
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48那么这个类里就包含了对我们这些配置的读写操作。参考网上的说法：
如果当spring.profiles.active属性被设置时，那么Spring会优先使用该属性对应值来激活Profile。当spring.profiles.active没有被设置时，那么Spring会根据spring.profiles.default属性的对应值来进行Profile进行激活。如果上面的两个属性都没有被设置，那么就不会有任务Profile被激活，只有定义在Profile之外的Bean才会被创建。
我们先看对默认配置的读写操作：
### setDefaultProfiles
```Java
/**
* Specify the set of profiles to be made active by default if no other profiles
* are explicitly made active through {@link #setActiveProfiles}.
* <p>Calling this method removes overrides any reserved default profiles
* that may have been added during construction of the environment.
* @see #AbstractEnvironment()
* @see #getReservedDefaultProfiles()
*/
//https://blog.csdn.net/jamet/article/details/77508182
@Override
public void setDefaultProfiles(String... profiles) {
Assert.notNull(profiles, "Profile array must not be null");
synchronized (this.defaultProfiles) {
this.defaultProfiles.clear();
for (String profile : profiles) {
validateProfile(profile);
this.defaultProfiles.add(profile);
}
}
}
/**
* Validate the given profile, called internally prior to adding to the set of
* active or default profiles.
* <p>Subclasses may override to impose further restrictions on profile syntax.
* @throws IllegalArgumentException if the profile is null, empty, whitespace-only or
* begins with the profile NOT operator (!).
* @see #acceptsProfiles
* @see #addActiveProfile
* @see #setDefaultProfiles
*/
protected void validateProfile(String profile) {
if (!StringUtils.hasText(profile)) {
throw new IllegalArgumentException("Invalid profile [" + profile + "]: must contain text");
}
if (profile.charAt(0) == '!') {
throw new IllegalArgumentException("Invalid profile [" + profile + "]: must not begin with ! operator");
}
}
其中defaultProfiles是个Set集合，它会先验证传入的一个或多个profile字符串不能为空且不能以!开头，然后放入集合中。
doGetDefaultProfiles
获取默认的Profiles
1 | /** |
如果当前defaultProfiles为保留的Profiles(就是一个单例的包含default的集合)，那么就尝试从propertyResolver
中获取,然后返回defaultProfiles集合。我们要注意到这边的Set集合实现其实是LinkedHashSet。
下回我们讲下ActiveProfiles的操作。
参考资料:
