Spring之BeanWrapper

电玩女神 2022-03-17 08:29 274阅读 0赞

## 作用 ##

BeanWrapper接口和它的实现BeanWrapperImpl是整个Spring框架最基本的类。它们利用反射机制（Reflection）和JavaBeans的标准提供一些对Java类属性的操作。其中最重要的操作是数据类型的转换和嵌套属性的引用（这使人联想起BeanUtils,OGNL和JSTL EL）。

## 源码 ##

public interface BeanWrapper extends ConfigurablePropertyAccessor { 
    
    	/** * Specify a limit for array and collection auto-growing. * <p>Default is unlimited on a plain BeanWrapper. * @since 4.1 */
    	void setAutoGrowCollectionLimit(int autoGrowCollectionLimit);
    
    	/** * Return the limit for array and collection auto-growing. * @since 4.1 */
    	int getAutoGrowCollectionLimit();
    
    	/** * Return the bean instance wrapped by this object, if any. * @return the bean instance, or {@code null} if none set */
    	Object getWrappedInstance();
    
    	/** * Return the type of the wrapped JavaBean object. * @return the type of the wrapped bean instance, * or {@code null} if no wrapped object has been set */
    	Class<?> getWrappedClass();
    
    	/** * Obtain the PropertyDescriptors for the wrapped object * (as determined by standard JavaBeans introspection). * @return the PropertyDescriptors for the wrapped object */
    	PropertyDescriptor[] getPropertyDescriptors();
    
    	/** * Obtain the property descriptor for a specific property * of the wrapped object. * @param propertyName the property to obtain the descriptor for * (may be a nested path, but no indexed/mapped property) * @return the property descriptor for the specified property * @throws InvalidPropertyException if there is no such property */
    	PropertyDescriptor getPropertyDescriptor(String propertyName) throws InvalidPropertyException;
    
    }