[英]Spring utility method to convert class to generic bean name
我的資源有一個常量,該常量是帶有低位第一個字母的類名。
是否有Spring實用程序方法將類類型轉換為首字母降低的字符串? 這使我可以安全地重構類名。
例如:
SpringXXX.defaultBeanNameYYY(MyCustomBeanFactoryProcessor.class)
應該產生:
myCustomBeanFactoryProcessor
默認情況下,形成Bean名稱的機制稱為BeanNameGenerator
(取決於上下文的類型,它可以是AnnotationBeanNameGenerator
或DefaultBeanNameGenerator
)。 要生成名稱,它需要一個bean定義和一個上下文,該定義來自於:
new AnnotationBeanNameGenerator().generateBeanName(definition, context);
例如,您可以在提供ConfigurableListableBeanFactory
實例的BeanFactoryPostProcessor
子類中編寫此處理過程:
class MyCustomBeanFactoryProcessor implements BeanFactoryPostProcessor {
@Override
public void postProcessBeanFactory(ConfigurableListableBeanFactory factory) throws BeansException {
String beanName = new AnnotationBeanNameGenerator()
.generateBeanName(new AnnotatedGenericBeanDefinition(MyCustomBeanFactoryProcessor.class),
(BeanDefinitionRegistry) factory);
}
}
最后,如果我們放棄上下文和Spring所做的所有檢查,我們可以執行:
Introspector.decapitalize(MyCustomBeanFactoryProcessor.class.getSimpleName());
要么
Introspector.decapitalize(ClassUtils.getShortName(MyCustomBeanFactoryProcessor.class));
您可以這樣寫自己:
public class BeanUtils {
public static String firstToLowerCase(Class clazz) {
String string = clazz.getSimpleName();
String post = string.substring(1, string.length());
String first = ("" + string.charAt(0)).toLowerCase();
return first + post;
}
}
並這樣調用: BeanUtils.firstToLowerCase(MyCustomBeanFactoryProcessor.class)
使用getSimpleName
字符串作為從@shi搜索查詢,我發現一個這樣實施了一絲spring-core/src/main/java/org/springframework/util/ClassUtils.java
:
/**
* Return the short string name of a Java class in uncapitalized JavaBeans
* property format. Strips the outer class name in case of an inner class.
* @param clazz the class
* @return the short name rendered in a standard JavaBeans property format
* @see java.beans.Introspector#decapitalize(String)
*/
public static String getShortNameAsProperty(Class<?> clazz) {
String shortName = getShortName(clazz);
int dotIndex = shortName.lastIndexOf(PACKAGE_SEPARATOR);
shortName = (dotIndex != -1 ? shortName.substring(dotIndex + 1) : shortName);
return Introspector.decapitalize(shortName);
}
用法:
@Test
public void my() {
String str = org.springframework.util.ClassUtils.getShortNameAsProperty(MyCustomBeanFactoryProcessor.class);
Assert.assertEquals("myCustomBeanFactoryProcessor", str);
}
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