package org.apache.commons.collections;
method CollectionUtils.isNotEmpty();
* 数组判null、空:
package org.apache.commons.lang;
method ArrayUtils.isEmpty();
* 字符串判null、空:
package org.apache.commons.lang;
method StringUtils.isNotBlank();
* 获取当前毫秒数:
System.currentTimeMillis();
* 数据转List:
List integerList = Arrays.asList(new Integer[]{1, 2, 3});