JadConfig 默认包含了基于内存，properties 文件，系统属性，以及环境变量的Repository，但是对于classpath 的文件处理不是很方便
我们可以自己在扩展
接口实现定义
public interface Repository {
/**
* Opens the configuration repository, e. g. create a database connection, open a file on disk for reading
*
* @throws RepositoryException If an error occurred while opening the data source
*/
void open() throws RepositoryException;
/**
* Reads the configuration parameter {@literal name} from the backing data source. The {@literal name} is specific
* to the underlying data source.
*
* @param name The parameter name
* @return The value of the provided {@literal name} as {@link String}
*/
String read(String name);
/**
* Closes the underlying data source when it isn't require any more.
*
* @throws RepositoryException If an error occurred while closing the underlying data source
*/
void close() throws RepositoryException;
}
参考实现
public class ClassPathRepository implements Repository {
private final Properties PROPERTIES = new Properties();
private String fileName = null;
public ClassPathRepository(String filename) {
this.fileName = filename;
}
@Override
public void open() throws RepositoryException {
if (fileName == null) {
throw new RepositoryException("Properties file must not be null!");
}
InputStream inputStream = null;
try {
inputStream = ClassPathRepository.class.getClassLoader().getResourceAsStream(fileName);
PROPERTIES.load(inputStream);
} catch (IOException ex) {
throw new RepositoryException("Couldn't open properties file: " + fileName, ex);
} finally {
if (inputStream != null) {
try {
inputStream.close();
} catch (IOException e) {
// Intentionally empty
}
}
}
}
@Override
public String read(String name) {
return PROPERTIES.getProperty(name);
}
@Override
public void close() throws RepositoryException {
}
}
使用
JadConfig jadConfig = new JadConfig(new ClassPathRepository("app.properties"),bean);
jadConfig.process();
说明
以上是一个简单的classpathRepository实现，实际上我们也可以基于其他文件扩展，比如yaml ，nacos 等，可以方便的实现配置管理，JadConfig 对于配置的管理方式还是很支持的借鉴学习的，比如dremio 对于配置也实现了类似的能力，包含check，validator。。。。