BeanUtils初始化对象

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最新推荐文章于 2023-02-10 13:07:40 发布

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本文深入探讨了Spring框架中BeanUtils工具类的instantiateClass方法，解析了如何通过无参构造器初始化对象，并强调了类需具备公共无参构造器及内部类为静态的要求，以防初始化失败。

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BeanUtils使用instantiateClass初始化对象注意

1.必须保证初始化类必须有public默认无参数构造器，注意初始化内部类时，内部类必须是静态的，否则报错！

源码如下

/**
	 * Instantiate a class using its no-arg constructor.
	 * As this method doesn't try to load classes by name, it should avoid
	 * class-loading issues.
	 * <p>Note that this method tries to set the constructor accessible
	 * if given a non-accessible (that is, non-public) constructor.
	 * @param clazz class to instantiate
	 * @return the new instance
	 * @throws BeanInstantiationException if the bean cannot be instantiated
	 */
	public static <T> T instantiateClass(Class<T> clazz) throws BeanInstantiationException {
		Assert.notNull(clazz, "Class must not be null");
		if (clazz.isInterface()) {
			throw new BeanInstantiationException(clazz, "Specified class is an interface");
		}
		try {
			return instantiateClass(clazz.getDeclaredConstructor());
		}
		catch (NoSuchMethodException ex) {
			throw new BeanInstantiationException(clazz, "No default constructor found", ex);
		}
	}