今天在自己定义的filter中,想要直接注入spring容器的其它bean进行操作,发现不能正常的注入: 原因:web容器加载顺序导致, 加载顺序是listener——filter——servlet,当项目启动时,filter先于servlet初始化, 而Spring中默认bean的初始化是在Servlet后进行的,所以会注入失败 解决办法:接下来编写一个SpringUtils进行手动注入bean @Component public class SpringUtils implements Ap
获取流对象 获取单列集合,双列集合,数组的流对象 单列集合获取流对象: 1.java.util.Collection接口中加入了default方法stream()获取流对象,因此其所有实现类均可通过此方式获取流. public class StreamTest01 { List<String> list = new ArrayList<>(); Stream<String> stream1 = list.stream(); Set<String> set =
up vote10down votefavorite I am trying to use Java 8 Streams to find elements in a LinkedList. I want to guarantee, however, that there is 1 and only 1 match to the filter criteria. Take this code: public static void main(String[] args) { LinkedList<