兔老大的胡萝卜

BeanUtil.copyProperties(源类, 需要改变的类);注意是BeanUtil，不是BeanUtils

java1.8之后BASE64Encoder 就无法使用了建议直接换成import java.util.Base64;然后这样加密 String encode = Base64.getEncoder().encodeToString( "参数".getBytes());

List<String> l =studyDataMainList.parallelStream().collect(Collectors.groupingBy(StudyDataMain::getId, Collectors.counting())) .entrySet().parallelStream() .filter(entry -> entry.getValue() >1).map(Map.Entry::ge.

1.使用：ThreadLocal starttime 记录开始时间但是这个参数一般是声明在静态变量中，如果不断地创造而没有调用remove方法会造成内存泄漏2.还有人说可以将startTime设置成成员变量，但是这样会导致多线程安全问题...

<!--hutool工具包--> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.3.10</version> </dependency>

生成一个类@Componentpublic class UserLoginInterceptor implements HandlerInterceptor { protected org.slf4j.Logger logger = LoggerFactory.getLogger(getClass()); @Override public boolean preHandle(HttpServletRequest request, HttpServletResponse resp

控制层@RequestMapping("/download") public void download(HttpServletRequest request, HttpServletResponse response, String filename) throws IOException { NoticeAttachment attachment; S...

map.put("newkey",map.remove("oldkey"));

@RequestMapping(value = "/exports2khList", method = { RequestMethod.GET, RequestMethod.POST }) public void exports2khList(HttpServletRequest request,HttpServletResponse response) throws Exceptio...

[https://blog.youkuaiyun.com/ethan_10/article/details/80335350](https://blog.youkuaiyun.com/ethan_10/article/details/80335350)

public static void main(String[] args) { // TODO Auto-generated method stub InetAddress ia=null; try { ia=ia.getLocalHost(); String localname=ia....

一般导入一个excle需要先规定一张导入模板 /** * */ /** *下载导入模板 * @param request * @param response */ @RequestMapping(value = "/exportTemlate", method = RequestMethod.GET) @Re...

单个list删除多个（推荐使用）//使用迭代器Iterator<String> it = a.iterator();while(it.hasNext()){ String m = it.next(); if("".equals(m)){ it.remove(); its.remove(); } }多个list删...

1.在web.xml文件中加入log4j的配置文件<!-- 加载log4j配置文件 --> <context-param> <param-name>log4jConfigLocation</param-name> <param-value>classpath:log4j.properties</param-va...

<select id="purgetapplyfood" parameterType="java.util.Map" resultType="com.trueway.apply.model.someclass"> select * from( select zaf.*,fo.NAME as foodname,ck.CKNAME,rownum idx fr...

//前台代码var abc = JSON.stringify(myArray); //转换一下自己的前台数组//后台代码String fishdies = request.getParameter("myArray"); //前台传递的JSONArray fishdiesList = JSONArray.fromObject(fishdies);//接下来就可以遍历成list...

https://blog.youkuaiyun.com/rj597306518/article/details/71480467https://www.hutool.club/

首先，我使用的是spring自带的定时器，因此，要在spring中配置<!--添加标头-->xmlns:util="http://www.springframework.org/schema/util"xmlns:task="http://www.springframework.org/schema/task"xmlns:context="http://www.springfr...

因为Oracle是要收费的，所以不能通过远程的方式来引入，可以通过mvn指令导入到Maven本地仓库。一、首先，下载ojdbc14-10.2.0.4.0.jar的驱动jar包，下载地址为：oracle官网地址：Oracle官网ojdbc14-10.2.0.4.0.jar包csdn用户上传的：https://download.youkuaiyun.com/download/weixin_38044597/...

removeAll方法

String str1 = originalFilename.substring(0, originalFilename.indexOf("."));

for (Map.Entry<String, String> entry : map.entrySet()) { System.out.println("key= " + entry.getKey() + " and value= " + entry.getValue());}前台传数组格式到后台//这是记录我自己的方法，做个笔记，不用看var myArray=new Ar...