[英]Add Annotated Class in Hibernate by adding all classes in some package. JAVA
有什么方法可以循環(例如通過 for)所有類都在某個包中? 我必須在AnnotationConfiguration
上addAnnotatedClass(Class c)
。 這樣做:
AnnotationConfiguration annotationConfiguration.addAnnotatedClass(AdditionalInformation.class);
annotationConfiguration.addAnnotatedClass(AdditionalInformationGroup.class);
annotationConfiguration.addAnnotatedClass(Address.class);
annotationConfiguration.addAnnotatedClass(BankAccount.class);
annotationConfiguration.addAnnotatedClass(City.class);
//et cetera
我所有的表都在包Tables.Informations
。
如評論中所述,使用 AnnotationConfiguration API 無法實現在包中加載所有類的功能。 以下是您可以使用上述 API 執行的一些操作(請注意,“addPackage”方法僅讀取包元數據,例如在 package-info.java 類中找到的元數據,它不會加載包中的所有類):
http://docs.jboss.org/hibernate/annotations/3.5/reference/en/html/ch01.html
sessionFactory = new AnnotationConfiguration()
.addPackage("test.animals") //the fully qualified package name
.addAnnotatedClass(Flight.class)
.addAnnotatedClass(Sky.class)
.addAnnotatedClass(Person.class)
.addAnnotatedClass(Dog.class)
.addResource("test/animals/orm.xml")
.configure()
.buildSessionFactory();
以下代碼遍歷指定包中的所有類,並列出用“@Entity”注釋的類。 這些類中的每一個都被添加到您的 Hibernate 工廠配置中,而不必明確列出它們。
public static void main(String[] args) throws URISyntaxException, IOException, ClassNotFoundException {
try {
Configuration configuration = new Configuration().configure();
for (Class cls : getEntityClassesFromPackage("com.example.hib.entities")) {
configuration.addAnnotatedClass(cls);
}
sessionFactory = configuration.buildSessionFactory();
} catch (Throwable ex) {
System.err.println("Failed to create sessionFactory object." + ex);
throw new ExceptionInInitializerError(ex);
}
}
public static List<Class<?>> getEntityClassesFromPackage(String packageName) throws ClassNotFoundException, IOException, URISyntaxException {
List<String> classNames = getClassNamesFromPackage(packageName);
List<Class<?>> classes = new ArrayList<Class<?>>();
for (String className : classNames) {
Class<?> cls = Class.forName(packageName + "." + className);
Annotation[] annotations = cls.getAnnotations();
for (Annotation annotation : annotations) {
System.out.println(cls.getCanonicalName() + ": " + annotation.toString());
if (annotation instanceof javax.persistence.Entity) {
classes.add(cls);
}
}
}
return classes;
}
public static ArrayList<String> getClassNamesFromPackage(String packageName) throws IOException, URISyntaxException, ClassNotFoundException {
ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
ArrayList<String> names = new ArrayList<String>();
packageName = packageName.replace(".", "/");
URL packageURL = classLoader.getResource(packageName);
URI uri = new URI(packageURL.toString());
File folder = new File(uri.getPath());
File[] files = folder.listFiles();
for (File file: files) {
String name = file.getName();
name = name.substring(0, name.lastIndexOf('.')); // remove ".class"
names.add(name);
}
return names;
}
有用的參考: https : //stackoverflow.com/a/7461653/7255
有一個很好的開源包叫做“org.reflections”。 你可以在這里找到它: https : //github.com/ronmamo/reflections
使用該包,您可以掃描這樣的實體:
Reflections reflections = new Reflections("Tables.Informations");
Set<Class<?>> importantClasses = reflections.getTypesAnnotatedWith(Entity.class);
for (Class<?> clazz : importantClasses) {
configuration.addAnnotatedClass(clazz);
}
您可以使用LocalSessionFactoryBuilder來構建會話工廠,使您能夠指定scanPackages屬性。
SessionFactory sessionFactory = new LocalSessionFactoryBuilder(hikariDataSource())
.scanPackages("com.animals.entities")
.addProperties(properties)
.buildSessionFactory();
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