すべてのjarパッケージの下に指定されたファイルをロード
4207 ワード
すべてのjarパッケージの下に指定されたファイルをロードします.
例えばspringにMETA-INF/springをロードする.handlersロード
org.springframework.core.io.support.PropertiesLoaderUtils#loadAllProperties(java.lang.String, java.lang.ClassLoader)
事例:
コア構文:
転載先:https://www.cnblogs.com/hfultrastrong/p/10772654.html
例えばspringにMETA-INF/springをロードする.handlersロード
org.springframework.core.io.support.PropertiesLoaderUtils#loadAllProperties(java.lang.String, java.lang.ClassLoader)
/**
* Load all properties from the specified class path resource
* (in ISO-8859-1 encoding), using the given class loader.
* Merges properties if more than one resource of the same name
* found in the class path.
* @param resourceName the name of the class path resource
* @param classLoader the ClassLoader to use for loading
* (or {@code null} to use the default class loader)
* @return the populated Properties instance
* @throws IOException if loading failed
*/
public static Properties loadAllProperties(String resourceName, @Nullable ClassLoader classLoader) throws IOException {
Assert.notNull(resourceName, "Resource name must not be null");
ClassLoader classLoaderToUse = classLoader;
if (classLoaderToUse == null) {
classLoaderToUse = ClassUtils.getDefaultClassLoader();
}
Enumeration urls = (classLoaderToUse != null ? classLoaderToUse.getResources(resourceName) :
ClassLoader.getSystemResources(resourceName));
Properties props = new Properties();
while (urls.hasMoreElements()) {
URL url = urls.nextElement();
URLConnection con = url.openConnection();
ResourceUtils.useCachesIfNecessary(con);
InputStream is = con.getInputStream();
try {
if (resourceName.endsWith(XML_FILE_EXTENSION)) {
props.loadFromXML(is);
}
else {
props.load(is);
}
}
finally {
is.close();
}
}
return props;
}
事例:
public static void main(String[] args) {
String handlerMappingsLocation = "META-INF/spring.handlers";
try {
Properties properties = PropertiesLoaderUtils.loadAllProperties(handlerMappingsLocation, BeanUtil.class.getClassLoader());
Enumeration> enumeration = properties.propertyNames();
while (enumeration.hasMoreElements()) {
String key = (String) enumeration.nextElement();
System.out.println(key);
}
} catch (IOException e) {
e.printStackTrace();
}
}
コア構文:
ClassLoader.getSystemResources(resourceName)
転載先:https://www.cnblogs.com/hfultrastrong/p/10772654.html