卑微的码农

【代码】ZipOutputStream打包多个excel下载。

idea jvm gc 调优

package com.example.ghs.config;import lombok.extern.slf4j.Slf4j;import org.springframework.stereotype.Component;import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOExce.

controller Map values = new HashMap(); values.put("userRealName", params.get("userRealName")); values.put("deptName", params.get("deptName")); Set<String> list = MapUtil.getKeyLike(linkedHashMapUserInfos, values); .

List<File> listFiles = new ArrayList(Arrays.asList(fs)); listFiles.removeIf(thisFile -> thisFile.getPath().contains(File.separator + "$") || thisFile.getPath().contains(File.separator + "."));

实体类属性 @ExcelProperty(value = "时间", index = 11) private String time;调用DateUtil DateUtil.setParams("yyyy/MM/dd","yyyy-MM-dd"); DateUtil.formatExcelDate(ExcelImport.getTime())DateUtilpublic class DateUtil { static pri.

import javax.servlet.*;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;/** * @description: * @author: kai_ba * @date: 2020/11/14 */@Component@Slf4jpublic class CorsFilter im.

@GetMapping(value = "exportXXX", produces = "text/html;charset=UTF-8") public void exportXXX(@RequestParam Map params, HttpServletResponse response, HttpServletRequest request) throws IOException { XXX yearCheck = JSON.parseObject(JSON.toJ...

//传入参数,读取信息 EasyExcelFactory.readBySax(inputStream, new Sheet(1, 1, YearCheckExcel.class), new AnalysisEventListener() { private List<Object> easyExcelList = new ArrayList<>(); private int excel_batch_count = 20.

package com.util;import org.apache.poi.hwpf.HWPFDocument;import org.apache.poi.xwpf.usermodel.XWPFDocument;import org.apache.poi.xwpf.usermodel.XWPFTable;import org.apache.poi.xwpf.usermodel.XWPFParagraph;import org.apache.poi.xwpf.usermodel.XWPFTab.

<select id="find" parameterType="java.util.Map" resultType="java.util.LinkedHashMap"> <choose> <when test="type !=null and type !=''"> <if test='type =="0"'> SELECT u.USER...

start.bat@echo off set name=%~n0start cmd /k "chcp 65001 && java -Dfile.encoding=utf-8 -jar %~n0.war"

import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;/** * @description:类、方法和属性添加注释方便读取 * @author: yang_kai * @date: 2020/10/3 */@Target({Ele.

注解：import java.lang.annotation.ElementType;import java.lang.annotation.Retention;import java.lang.annotation.RetentionPolicy;import java.lang.annotation.Target;/** * @description: * @author: yangkai * @date: 2020/9/18 */@Target({ElementType.TYP

int [] arr = new int [6]; System.out.println(arr[2]); List list=new ArrayList(10) ; System.out.println(list.get(2));运行结果：0Exception in thread "main" java.lang.IndexOutOfBoundsException: Index: 2, Size: 0 at java.util...

File file=new File("src/main/resources/lib/unsafe/ProjectInterceptor.jar"); File file2=new File("target/classes/io/lib/xjar/XCryptos.class"); System.out.println(file.getName()); System.out.println(file2.getName());

<?xml version="1.0" encoding="utf-8" ?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://w...

@Select({ "<script>", "select", "*",//别用* "from filmdate", "where id in", "<foreach collection='ids' item='id' ope...

数据库存的路径用“/”String dir = new File("").getCanonicalPath();String filepath = dir+"/archive/src/main/webapp/userfiles/fileupload/"+DateUtils.getCurrentDate("yyyyMM")+"/";filepath=StringUtils.replace(...

Set<String> proxysAll=new HashSet<>(); for (int i = 0; i < proxysAll.size(); i++) { proxysAll.add(String.valueOf(i)); } Iterator iterator=pr...

Iterator it = list.get(i).entrySet().iterator(); int celli=0; while(it.hasNext()){ Map.Entry entry = (Map.Entry) it.next(); System.out.println(entry.getKey() + " : " + entry.getValue())...

staticfinal静态常量，static静态变量并不依赖于类；类变量依赖于类；

定义一个变量 private boolean firstH=true;访问action改变变量的值/** * 加载前端（或刷新页面） */ @RequiresPermissions("sorder:sorder:view") @RequestMapping(value = {"list", ""}) public String list(Sorder sorder...

package com.example.demo2;import com.gargoylesoftware.htmlunit.BrowserVersion;import com.gargoylesoftware.htmlunit.NicelyResynchronizingAjaxController;import com.gargoylesoftware.htmlunit.ProxyCo...

填坑：fori移除会导致循环跳过元素，使用Iterator就可以删除完然后继续判断下一个；list集合需要包装一下：List<String> list = new ArrayList<String>(Arrays.asList(ipPortStrs));否则会报错UnsupportedOperationExceptionList<String> l...

获取当前action，controller名，ip地址package com.jeesite.modules.util;import BP.Tools.DateUtils;import com.jeesite.modules.entityk.JdbcTemplate;import com.jeesite.modules.sys.utils.CompanyUtils;import c...

StackTraceElement[] stackTrace = Thread.currentThread().getStackTrace(); for (StackTraceElement e : stackTrace) { System.out.println(e.getClassName() + "\t" ...

package com.jeesite.modules.util;import BP.Tools.DateUtils;import BP.Tools.StringUtils;import com.jeesite.modules.msg.entity.MsgPush;import com.jeesite.modules.msg.service.MsgPushService1;impor...

String content=null; for (int i = 0; i < fenzus.length; i++) { content+="<div>"+fenzu1[i]+":<input type='text' name='"+fenzu0[i]+"'/></div>"; ...

错误使用：List<Sfieldassodetail> sfieldassodetailList = sfieldassodetailService.getSFieldassodetail("f1_2_document","1564381047325600343");//数据处理将空数据放入最后List<Sfieldassodetail> nullData = n...

Page page=new Page<>(request, response); page.setCount(documentVList.size()); if(documentVList.size()<page.getPageSize()){ page.setList(documentVList); ...

for (int i = 0; i < list.size(); i++) { List<Object> names=new ArrayList<>(); List<Object> values=new ArrayList<>(); for (int j = 0; j < sfieldassodetailList.size(...

session保存在服务器端，会一直存在，默认存在时间30分钟；cookie保存sessionid，服务器会根据cookie中sessionid获取session；两种类型的Cookie：临时Cookie（会话Cookie） 永久Cookie不设置过期时间，则表示这个cookie生命周期为浏览器会话期间，只要关闭浏览器窗口，cookie就消失了。这种生命期为浏览会话期的cookie...

一、String转byte[]String str="abc"; byte[] byteArray = str.getBytes();二、byte[]转Stringbyte[] byteArray = {'1','1'};String str = new String(byteArray);

一、BufferedInputStream、BufferedOutputStream（缓存字节流）使用方式和字节流差不多，但是效率更高（推荐使用） try { //读取文件(缓存字节流) BufferedInputStream in = new BufferedInputStream(new FileInputStream("d:...

注意：用163邮箱发送到QQ邮箱，QQ邮箱会把邮件放到垃圾箱，QQ邮箱发送到163邮箱没问题。（这背后怕是有。。。。。。）一、添加 pom.xml 依赖 <!--邮件--> <dependency> <groupId>com.sun.mail</groupId> ...

保存：{ String name1x=System.currentTimeMillis()+""; String path="D:/uuuuuuuuu"; saveFile(file,path,"pic",name1x);}; private boolean saveFile(MultipartFile file, Strin...