Java操作excel之poi

1. 创建Excel

1.1 创建新Excel工作簿

引入poi依赖

<!-- https://mvnrepository.com/artifact/org.apache.poi/poi -->          
<dependency>                  <groupId>org.apache.poi</groupId>                  <artifactId>poi</artifactId>                  <version>5.2.3</version>          
</dependency>

java代码

import org.apache.poi.hssf.usermodel.HSSFWorkbook; 
import org.apache.poi.ss.usermodel.Workbook; 
import java.io.FileOutputStream;  
public class Demo01 {     public static void main(String[] args) throws Exception {         // 创建一个工作簿         Workbook wb = new HSSFWorkbook();         // 创建输出流         FileOutputStream fileOutputStream = new FileOutputStream("E:\\java\\poi\\poi\\创建一个Excel工作簿.xls");         wb.write(fileOutputStream);         // 工作簿写出流         wb.close();     } 
}

运行代码

 1.2 创建新sheet页

java代码

import org.apache.poi.hssf.usermodel.HSSFWorkbook;  
import org.apache.poi.ss.usermodel.Workbook;   
import java.io.FileOutputStream;   
public class Demo02 {          public static void main(String[] args) throws Exception {                  // 创建一个工作簿                  Workbook wb = new HSSFWorkbook();                  // 创建一个sheet页                  wb.createSheet("这是第一个sheet的名字");                  wb.createSheet("这是第二个sheet的名字");                  // 创建输出流                  FileOutputStream fileOutputStream = new FileOutputStream("E:\\java\\poi\\poi\\创建sheet.xls");                  // 工作簿写出流                  wb.write(fileOutputStream);                  wb.close();          }  
}

运行代码

1.3 创建单元格

java代码

import org.apache.poi.hssf.usermodel.HSSFWorkbook;  
import org.apache.poi.ss.usermodel.Row;  
import org.apache.poi.ss.usermodel.Sheet;  
import org.apache.poi.ss.usermodel.Workbook;   
import java.io.FileOutputStream;   
public class Demo03 {          public static void main(String[] args) throws Exception {                  // 创建一个工作簿                  Workbook wb = new HSSFWorkbook();                  // 创建一个sheet页                  Sheet sheet = wb.createSheet("这是第一个sheet的名字");                  // 创建单元格并设置内容                  // 创建第一行                  Row row = sheet.createRow(0);                  row.createCell(0).setCellValue(1); // 第一列          row.createCell(1).setCellValue(1.2); // 第二列            row.createCell(2).setCellValue("字符串"); // 第三列                // 创建输出流                  FileOutputStream fileOutputStream = new FileOutputStream("E:\\java\\poi\\poi\\创建sheet.xls");                // 工作簿写出流                  wb.write(fileOutputStream);               wb.close();        }  
}

运行代码

2. 创建时间格式单元格

2.1 创建一个时间格式的单元格

Java代码

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import java.io.FileOutputStream;
import java.util.Date;/*** @Description: 创建时间格式单元格* @author: lh*/
public class Demo04 {public static void main(String[] args) throws Exception {Workbook workbook = new HSSFWorkbook();Sheet sheet = workbook.createSheet("第一个sheet页");Row row = sheet.createRow(0);row.createCell(0).setCellValue(new Date());// 设置单元格日期格式CreationHelper creationHelper = workbook.getCreationHelper();CellStyle cellStyle = workbook.createCellStyle();// 单元格样式cellStyle.setDataFormat(creationHelper.createDataFormat().getFormat("yyyy-MM-dd hh:mm:ss"));Cell cell = row.createCell(1);cell.setCellValue(new Date());cell.setCellStyle(cellStyle);FileOutputStream fileOutputStream = new FileOutputStream("/Users/lihui/Documents/Java/poi/工作簿");workbook.write(fileOutputStream);workbook.close();}
}

运行结果

2.2 遍历工作簿的行和列并获取单元格内容

java代码

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import java.io.FileInputStream;/*** @Description: 遍历单元格* @author: lh*/
public class Demo05 {public static void main(String[] args) throws Exception {FileInputStream fileInputStream = new FileInputStream("/Users/lihui/Documents/Java/poi/工作簿.xls");POIFSFileSystem fs = new POIFSFileSystem(fileInputStream);HSSFWorkbook hssfWorkbook = new HSSFWorkbook(fs);HSSFSheet sheet = hssfWorkbook.getSheetAt(0);if (sheet == null) {return;}// 遍历rowfor (int i = 0; i <= sheet.getLastRowNum(); i++) {HSSFRow row = sheet.getRow(i);if (row == null) {continue;}// 遍历cellfor (int j = 0; j <= row.getLastCellNum(); j++) {if (row.getCell(j) == null) {continue;}System.out.print(" " + getValue(row.getCell(j)));}System.out.println();}}/*** 获取不同类型单元格类型的值 * @param cell 单元格* @return 单元格内容*/private static String getValue(HSSFCell cell) {switch (cell.getCellType()) {case NUMERIC:return Double.toString(cell.getNumericCellValue());case BOOLEAN:return Boolean.toString(cell.getBooleanCellValue());case FORMULA:return cell.getCellFormula();case STRING:return cell.getStringCellValue();// Add cases for other cell types as needed...default:System.out.println("Unsupported cell type");return "";}}
}

运行结果

2.4 文本提取

Java代码

import org.apache.poi.hssf.extractor.ExcelExtractor;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import java.io.FileInputStream;/*** @Description: 文本提取* @author: lh*/
public class Demo06 {public static void main(String[] args) throws Exception {FileInputStream fileInputStream = new FileInputStream("/Users/lihui/Documents/Java/poi/工作簿.xls");POIFSFileSystem fs = new POIFSFileSystem(fileInputStream);HSSFWorkbook hssfWorkbook = new HSSFWorkbook(fs);ExcelExtractor excelExtractor = new ExcelExtractor(hssfWorkbook);excelExtractor.setIncludeSheetNames(false); //不需要sheet页System.out.println(excelExtractor.getText());fileInputStream.close();fs.close();}
}

运行结果 

3. 单元格处理

3.1 单元格对齐方式

Java代码

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import java.io.FileOutputStream;import org.apache.poi.ss.usermodel.*;/*** @Description: 单元格对齐方式* @author: lh*/
public class Demo07 {public static void main(String[] args) throws Exception {Workbook workbook = new HSSFWorkbook();Sheet sheet = workbook.createSheet("第一个sheet页");Row row = sheet.createRow(0);row.setHeightInPoints(30);// 创建单元格对齐方式createCell(workbook, row, (short) 0, HorizontalAlignment.CENTER,  VerticalAlignment.CENTER, "单元格对齐方式1");createCell(workbook, row, (short) 1, HorizontalAlignment.LEFT, VerticalAlignment.BOTTOM,  "单元格对齐方式2");createCell(workbook, row, (short) 2, HorizontalAlignment.RIGHT, VerticalAlignment.TOP,  "单元格对齐方式3");FileOutputStream fileOutputStream = new FileOutputStream("/Users/lihui/Documents/Java/poi/工作簿.xls");workbook.write(fileOutputStream);workbook.close();}private static void createCell(Workbook workbook, Row row, short column, HorizontalAlignment align, VerticalAlignment valign, String value) {Cell cell = row.createCell(column);CellStyle cellStyle = workbook.createCellStyle();cellStyle.setAlignment(align);cellStyle.setVerticalAlignment(valign);cell.setCellValue(value);cell.setCellStyle(cellStyle);}
}

运行结果

3.2 单元格边框处理

java代码

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;import java.io.FileOutputStream;/*** @Description: 单元格边框处理* @author: lh*/
public class Demo08 {public static void main(String[] args) throws Exception{Workbook workbook = new HSSFWorkbook();Sheet sheet = workbook.createSheet("第一个sheet页");Row row = sheet.createRow(1);row.setHeightInPoints(30);Cell cell = row.createCell(1);cell.setCellValue("单元格边框处理");// 单元格边框处理CellStyle cellStyle = workbook.createCellStyle();cellStyle.setBorderTop(BorderStyle.THIN); // 顶部边框样式cellStyle.setTopBorderColor(IndexedColors.RED.getIndex()); // 顶部边框颜色cellStyle.setBorderLeft(BorderStyle.MEDIUM); // 左边边框样式cellStyle.setLeftBorderColor(IndexedColors.BLUE.getIndex()); // 左边边框颜色cellStyle.setBorderRight(BorderStyle.MEDIUM); // 右边边框样式cellStyle.setRightBorderColor(IndexedColors.GREEN.getIndex()); // 右边边框颜色cellStyle.setBorderBottom(BorderStyle.MEDIUM); // 底部边框样式cellStyle.setBottomBorderColor(IndexedColors.BROWN.getIndex()); // 底部边框颜色cell.setCellStyle(cellStyle);FileOutputStream fileOutputStream = new FileOutputStream("/Users/lihui/Documents/Java/poi/工作簿.xls");workbook.write(fileOutputStream);workbook.close();}
}

运行结果

3.3 单元格填充色和颜色操作

java代码

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import java.io.FileOutputStream;/*** @Description: 设置单元格颜色* @author: lh*/
public class Demo09 {public static void main(String[] args) throws Exception{Workbook workbook = new HSSFWorkbook();Sheet sheet = workbook.createSheet("第一个sheet页");Row row = sheet.createRow(1);row.setHeightInPoints(30);// 设置单元格颜色Cell cell = row.createCell(1);cell.setCellValue("单元格边框处理");CellStyle cellStyle = workbook.createCellStyle();cellStyle.setFillForegroundColor(IndexedColors.GREEN.getIndex()); //背景色cellStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);cell.setCellStyle(cellStyle);Cell cell1 = row.createCell(2);cell1.setCellValue("单元格边框处理1");CellStyle cellStyle1 = workbook.createCellStyle();cellStyle1.setFillForegroundColor(IndexedColors.RED.getIndex()); //前景色cellStyle1.setFillPattern(FillPatternType.SOLID_FOREGROUND);cell1.setCellStyle(cellStyle1);FileOutputStream fileOutputStream = new FileOutputStream("/Users/lihui/Documents/Java/poi/工作簿.xls");workbook.write(fileOutputStream);workbook.close();}
}

运行结果

3.4 单元格合并

java代码

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.CellRangeAddress;import java.io.FileOutputStream;/*** @Description: 单元格合并* @author: lh*/
public class Demo10 {public static void main(String[] args) throws Exception{Workbook workbook = new HSSFWorkbook();Sheet sheet = workbook.createSheet("第一个sheet页");Row row = sheet.createRow(1);row.setHeightInPoints(30);// 合并单元格Cell cell = row.createCell(1);cell.setCellValue("合并单元格");sheet.addMergedRegion(new CellRangeAddress(1, 1, 1, 3));FileOutputStream fileOutputStream = new FileOutputStream("/Users/lihui/Documents/Java/poi/工作簿.xls");workbook.write(fileOutputStream);workbook.close();}
}

运行结果

4. 字体处理

4.1 字体处理

java代码

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;import java.io.FileOutputStream;/*** @Description: 字体处理* @author: lh*/
public class Demo11 {public static void main(String[] args) throws Exception{Workbook workbook = new HSSFWorkbook();Sheet sheet = workbook.createSheet("第一个sheet页");Row row = sheet.createRow(1);row.setHeightInPoints(30);// 创建一个字体处理类Font font = workbook.createFont();font.setFontHeightInPoints((short) 24);font.setFontName("宋体");font.setItalic(true);CellStyle cellStyle = workbook.createCellStyle();cellStyle.setFont(font);Cell cell = row.createCell((short) 1);cell.setCellValue("hello world");cell.setCellStyle(cellStyle);FileOutputStream fileOutputStream = new FileOutputStream("/Users/lihui/Documents/Java/poi/工作簿.xls");workbook.write(fileOutputStream);workbook.close();}
}

运行结果

4.2 单元格中使用换行

java代码

import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ss.usermodel.*;import java.io.FileOutputStream;/*** @Description: 单元格换行* @author: lh*/
public class Demo12 {public static void main(String[] args) throws Exception{Workbook workbook = new HSSFWorkbook();Sheet sheet = workbook.createSheet("第一个sheet页");Row row = sheet.createRow(1);row.setHeightInPoints(30);Cell cell = row.createCell(2);cell.setCellValue("我要换行 \n 成功了吗？");CellStyle cellStyle = workbook.createCellStyle();// 设置可以换行cellStyle.setWrapText(true);cell.setCellStyle(cellStyle);FileOutputStream fileOutputStream = new FileOutputStream("/Users/lihui/Documents/Java/poi/工作簿.xls");workbook.write(fileOutputStream);workbook.close();}
}

运行结果

5. 综合示例

// excel导入	
@Transactional
public Result<?> import(Model model) throws IOException
{// 获取上传附件String attId = attachFileAppService.handleAttFiles(Collections.singletonList(model));if (StringUtil.isEmpty(attId)){throw new NormalRuntimeException(ModelCodeConstants.ATTACHMENT_LOST);}Workbook workbook = null;InputStream data = null;try{// 获取Excel文件流UploadAttachFileInfo uploadAttachFileInfo = attachFileAppService.downloadFile(attId);// 文件格式校验checkType(uploadAttachFileInfo);data = uploadAttachFileInfo.getData();workbook = ExcelUtils.getExcelWorkbook(data);Sheet sheet = workbook.getSheet(ModelCodeConstants."读取sheet的名字");if (CommonUtil.isEmpty(sheet)){return Result.fail(ModelCodeConstants.ERROR_TITLE);}// 表头检验checkTitle(sheet);// 空表检验if (sheet.getLastRowNum() == 0 && sheet.getPhysicalNumberOfRows() == 1){return Result.fail(ModelCodeConstants.EMPTY_FILE);}// 数据导入- 从第四行开始int startRowIndex = 4;Iterator<Row> iterator = sheet.iterator();for (int i = 0; i < startRowIndex; i++){iterator.next();}List<XXX> list = new ArrayList<>();List<XXX> errList = new ArrayList<>();while (iterator.hasNext()){Row row = iterator.next();String xxx = getValue(row.getCell(0));String yyy = getValue(row.getCell(1));String zzz = getValue(row.getCell(2));String aaa = getValue(row.getCell(3));// 导入数据规则校验StringJoiner joiner = new StringJoiner(",");checkBody(xxx, yyy, zzz, aaa, joiner);XXX err = new XXX();if (joiner.length() != 0){err.setErrMsg(joiner);// 错误信息添加errList.add(err);} else{XXX x = new XXX();// 入库信息添加list.add(x);// 数据入库service.add();}}if (CommonUtil.isNotEmpty(errList)){//把原信息和错误信息写回去String uuid = writeErrExcel(errList);return Result.fail("数据导入不成功，点击下载错误信息！").setData(uuid);}} catch (Exception e){e.printStackTrace();return Result.fail(e.getMessage());} finally{assert workbook != null;workbook.close();data.close();}return Result.success();
}/**
* 文件格式校验 以xls或者xlsx结尾
*/
private static void checkType(UploadAttachFileInfo uploadAttachFileInfo)
{AttachFileInfo fileInfo;fileInfo = uploadAttachFileInfo.getFileInfo();if (!fileInfo.getFileName().endsWith(ModelCodeConstants.EXCEL_SUFFIX_XLS)&& !fileInfo.getFileName().endsWith(ModelCodeConstants.EXCEL_SUFFIX_XLSX)){throw new NormalRuntimeException("文件格式有误！");}
}/**
* 校验表头是否正确
*/
private static void checkTitle(Iterator<Row> rowIterator)
{Row headerRow = rowIterator.next();Cell xxxx = headerRow.getCell(0);Cell yyyy = headerRow.getCell(1);if (!"xxxx".equals(xxxx.getStringCellValue()) || !"yyyy".equals(yyyy.getStringCellValue())){throw new NormalRuntimeException(ModelCodeConstants.ERROR_TITLE);}
}/**
* 填写错误信息excel
*/
private String writeErrExcel(List<XXX> errList) throws Exception
{// 读取错误信息模板String rootPath = SpringContextConfig.getOptRootPath();String filePath = rootPath + FilePathConst.TEMPLATE_FILE_PATH + FileNameConst.WBS_CODE_ERROR_FILE_NAME;File file = ResourceUtils.getFile(filePath);InputStream inputStream = Files.newInputStream(file.toPath());// 处理导入错误信息数据Workbook workbook = ExcelUtils.getExcelWorkbook(inputStream);Sheet sheet = workbook.getSheet(ModelCodeConstants.TEMPLATE_ESTIMATE_DETAILS);int startRow = 4; // 从第五行开始写入数据CellStyle cellStyle = workbook.createCellStyle();cellStyle.setWrapText(true); // 自动换行for (int i = startRow; i < errList.size() + startRow; i++){Row row = sheet.createRow(i);XXX rowData = errList.get(i - startRow); // 获取当前行数据String xxx = rowData.getLevel();String yyy = rowData.getWbsCode();String zzz = rowData.getWbsDescribe();String aaa = rowData.getWbsAmount();String errMsg = rowData.getErrMsg();row.createCell(0).setCellValue(xxx);row.createCell(1).setCellValue(yyy);row.createCell(2).setCellValue(zzz);row.getCell(2).setCellStyle(cellStyle);row.createCell(3).setCellValue(aaa);row.createCell(4).setCellValue(errMsg);row.getCell(4).setCellStyle(cellStyle);}// Excel文件写到目标路径下String uuid = CommonUtil.getUUID();String distPath = AttachServerConfig.AttachServerTempPath + "/" + FilePathConst.ERROR_FILE_PATH + "/" + uuid+ "/" + FileNameConst.WBS_CODE_ERROR_FILE_NAME;ExcelWriter write = new ExcelWriter(sheet);write.setDestFile(new File(distPath));write.flush();write.close();InputStream distStream = new FileInputStream(distPath);uuid = attachFileAppService.uploadFile(distStream, FileNameConst.WBS_CODE_ERROR_FILE_NAME,FileModelTypeEnum.导入失败信息.getModel(), uuid, "xlsx");return uuid;
}


// 枚举常量类
public interface ModelCodeConstants
{public final String ATTACHMENT_LOST = "导入附件丢失或未找到，请重新上传!";public final String ERROR_TITLE = "表头信息错误，请使用标准模板文件导入!";public final String EMPTY_FILE = "上传文件内容为空，请确认！";}
// excel工具类
public class ExcelUtils
{	/*** 读取工作区域，传入流文件* @param input* @return*/public static Workbook getExcelWorkbook(InputStream input){Workbook workbook = null;try{workbook = WorkbookFactory.create(input);} catch (EncryptedDocumentException | InvalidFormatException | IOException e){e.printStackTrace();}return workbook;}/*** 获取不同类型单元格类型的值 * @param cell 单元格* @return 单元格内容*/private static String getValue(HSSFCell cell) {switch (cell.getCellType()) {case NUMERIC:return Double.toString(cell.getNumericCellValue());case BOOLEAN:return Boolean.toString(cell.getBooleanCellValue());case FORMULA:return cell.getCellFormula();case STRING:return cell.getStringCellValue();// Add cases for other cell types as needed...default:System.out.println("Unsupported cell type");return "";}}
}

本文来自互联网用户投稿，该文观点仅代表作者本人，不代表本站立场。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如若转载，请注明出处：http://www.hqwc.cn/news/207520.html

如若内容造成侵权/违法违规/事实不符，请联系编程知识网进行投诉反馈email:809451989@qq.com，一经查实，立即删除！

相关文章

Redis事务的理解与使用

Redis事务的理解与使用

文章目录 Redis 事务1)基本认识2)事务操作1.MULTI2.EXEC3.错误处理4.DISCARD5.WATCH6.SCRIPT Redis 事务 官方文档&#xff0c;永远是你学习的第一手资料&#xff1a;Redis 事务 1)基本认识 谈到事务&#xff0c;大家首先都会联想到 mysql 中复杂但又功能强大的“事务”&…
阅读更多...
hp惠普Victus Gaming Laptop 15-fa1025TX/fa1005tx原装出厂Win11系统ISO镜像

hp惠普Victus Gaming Laptop 15-fa1025TX/fa1005tx原装出厂Win11系统ISO镜像

光影精灵9笔记本电脑原厂W11系统22H2恢复出厂时开箱状态一模一样 适用型号&#xff1a;15-fa1003TX&#xff0c;15-fa1005TX&#xff0c;15-fa1007TX&#xff0c;15-fa1025TX 链接&#xff1a;https://pan.baidu.com/s/1fBPjed1bhOS_crGIo2tP1w?pwduzvz 提取码&#xff1a…
阅读更多...
redis运维(十六) 有序集合

redis运维(十六) 有序集合

一 有序集合 把握一点&#xff1a; 各种redis 命令都提供各种语言对应的API 接口,后续API是关键 ① 概念 1、sorted set --> 有序集合2、redis有序集合也是集合类型的一部分&#xff0c;所以它保留了集合中元素不能重复的特性3、但是不同的是,有序集合给每个元素多设置…
阅读更多...
什么是Jmeter?Jmeter使用的原理步骤是什么？

什么是Jmeter?Jmeter使用的原理步骤是什么？

1.1 什么是 JMeter Apache JMeter 是 Apache 组织开发的基于 Java 的压力测试工具。用于对软件做压力测试&#xff0c;它最初被设计用于 Web 应用测试&#xff0c;但后来扩展到其他测试领域。 它可以用于测试静态和动态资源&#xff0c;例如静态文件、Java 小服务程序、CGI 脚本…
阅读更多...
【并发编程】ThreadLocal详解与原理

【并发编程】ThreadLocal详解与原理

&#x1f4eb;作者简介&#xff1a;小明Java问道之路&#xff0c;2022年度博客之星全国TOP3&#xff0c;专注于后端、中间件、计算机底层、架构设计演进与稳定性建设优化&#xff0c;文章内容兼具广度、深度、大厂技术方案&#xff0c;对待技术喜欢推理加验证&#xff0c;就职于…
阅读更多...
Verilog开源项目——百兆以太网交换机（三）Hash模块设计

Verilog开源项目——百兆以太网交换机（三）Hash模块设计

Verilog开源项目——百兆以太网交换机&#xff08;三&#xff09;Hash模块设计 &#x1f508;声明&#xff1a;未经作者允许&#xff0c;禁止转载 &#x1f603;博主主页&#xff1a;王_嘻嘻的CSDN主页 &#x1f511;全新原创以太网交换机项目&#xff0c;Blog内容将聚焦整体架…
阅读更多...
C++二分查找算法：132 模式解法三枚举1

C++二分查找算法：132 模式解法三枚举1

本文涉及的基础知识点 二分查找算法合集 本题不同解法 包括题目及代码C二分查找算法&#xff1a;132 模式解法一枚举3C二分查找算法&#xff1a;132 模式解法二枚举2代码最简洁C二分查找算法&#xff1a;132 模式解法三枚举1性能最佳C单调向量算法&#xff1a;132 模式解法三…
阅读更多...
01背包与完全背包学习总结

01背包与完全背包学习总结

背包问题分类见下图 参考学习点击&#xff1a;代码随想录01背包讲解 01背包问题&#xff1a; 核心思路&#xff1a; 1、先遍历物品个数&#xff0c;再遍历背包容量。因为容量最先是最大的&#xff0c;往背包里放物品&#xff0c;所以背包容量在慢慢减少&#xff0c;但背包容量…
阅读更多...
小程序泄露腾讯地图apikey

小程序泄露腾讯地图apikey

今天挖小程序时测了很久&#xff0c;一直没有头绪&#xff0c;后来想要测试一下支付漏洞&#xff0c;但是这里却出问题了 添加地址时我发现&#xff0c;当我添加一个地址时&#xff0c;他会显示腾讯地图的logo和一部分小图&#xff0c;那时候我就在想&#xff0c;既然这里可以调…
阅读更多...
基于区域划分的GaN HEMT 准物理大信号模型

基于区域划分的GaN HEMT 准物理大信号模型

GaN HEMT器件的大信号等效电路模型分为经验基模型和物理基模型。经验基模型具有较高精度但参数提取困难&#xff0c;特别在GaN HEMT器件工艺不稳定的情况下不易应用。相比之下&#xff0c;物理基模型从器件工作机理出发&#xff0c;参数提取相对方便&#xff0c;且更容易更新和…
阅读更多...
C++之常用的排序算法

C++之常用的排序算法

C之常用的排序算法 sort #include<iostream> using namespace std; #include<vector> #include<algorithm> #include<functional> void Myptint(int val) {cout << val << " "; }void test() {vector<int> v;v.push_back(…
阅读更多...
vue3引入vuex基础

vue3引入vuex基础

一&#xff1a;前言 使用 vuex 可以方便我们对数据的统一化管理&#xff0c;便于各组件间数据的传递&#xff0c;定义一个全局对象&#xff0c;在多组件之间进行维护更新。因此&#xff0c;vuex 是在项目开发中很重要的一个部分。接下来让我们一起来看看如何使用 vuex 吧&#…
阅读更多...
推荐文章
最新文章

Copyright @ 2022~2023