Spring的Assert工具类的用法【转载】

转载自 http://blog.csdn.net/StayHungry2016/article/details/54574526
Assert断言工具类,通常用于数据合法性检查,在JAVA编程中,通常会编写如下代码:
   if (name == null || name.equls("")) { 
          逻辑处理
}  
在所有方法中都使用手工检测合法性的方式并不是太好,因为这样影响了代码的可读性,
若使用Assert工具类上面的代码可以简化为: 
Assert.hasText((name, "参数错误!");

这样可以大大增强代码的可读性,介绍一下Assert 类中的常用断言方法:

notNull(Object object, "object is required")                 -    对象非空 3hf 
isTrue(Object object, "object must be true")                 -    对象必须为true  
notEmpty(Collection collection, "collection must not be empty")          -    集合非空 
hasLength(String text, "text must be specified")                -    字符不为null且字符长度不为0  
hasText(String text, "text must not be empty")                  -     text 不为null且必须至少包含一个非空格的字符 
isInstanceOf(Class clazz, Object obj, "clazz must be of type [clazz]")         -    obj必须能被正确造型成为clazz 指定的类

   只记录这么多,具体自己去找spring的工具类(import org.springframework.util.Assert)
   留下个API地址,需要的自己去查阅API    http://www.apihome.cn/api/spring/Assert.html
Assert类具体实现部分:
/**
	 * @deprecated as of 4.3.7, in favor of {@link #doesNotContain(String, String, String)}
	 */
	@Deprecated
	public static void doesNotContain(String textToSearch, String substring) {
		doesNotContain(textToSearch, substring,
				"[Assertion failed] - this String argument must not contain the substring [" + substring + "]");
	}

	/**
	 * Assert that an array contains elements; that is, it must not be
	 * {@code null} and must contain at least one element.
	 * <pre class="code">Assert.notEmpty(array, "The array must contain elements");</pre>
	 * @param array the array to check
	 * @param message the exception message to use if the assertion fails
	 * @throws IllegalArgumentException if the object array is {@code null} or contains no elements
	 */
	public static void notEmpty(Object[] array, String message) {
		if (ObjectUtils.isEmpty(array)) {
			throw new IllegalArgumentException(message);
		}
	}

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转载自dick1305.iteye.com/blog/2406465
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