java(poi)向Excel中写入数据代码

小鱼儿 2021-09-23 01:38 350阅读 0赞

pom.xml

<properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <encoding>UTF-8</encoding>
            <maven.compiler.source>1.7</maven.compiler.source>
            <maven.compiler.target>1.7</maven.compiler.target>
            <mysql.version>5.1.10</mysql.version>
            <poi.version>3.9</poi.version>
            <slf4j.version>1.7.21</slf4j.version>
            <mybatis.version>3.2.8</mybatis.version>
            
        </properties>
        <dependencies>
            
            <dependency>
                <groupId>mysql</groupId>
                <artifactId>mysql-connector-java</artifactId>
                <version>${mysql.version}</version>
            </dependency>
            
            <dependency>
                <groupId>org.apache.poi</groupId>
                <artifactId>poi</artifactId>
                <version>${poi.version}</version>
            </dependency>
            <dependency>
                <groupId>org.apache.poi</groupId>
                <artifactId>poi-ooxml</artifactId>
                <version>${poi.version}</version>
            </dependency>
            
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-api</artifactId>
                <version>${slf4j.version}</version>
            </dependency>
            <dependency>
                <groupId>org.slf4j</groupId>
                <artifactId>slf4j-log4j12</artifactId>
                <version>${slf4j.version}</version>
            </dependency>
            
        </dependencies>

TestExcel.java

import java.io.FileOutputStream;
    import java.text.ParseException;
    import java.text.SimpleDateFormat;
    import java.util.Date;
    import java.util.LinkedList;
    import java.util.List;
    
    import org.apache.poi.hssf.usermodel.HSSFCell;
    import org.apache.poi.hssf.usermodel.HSSFCellStyle;
    import org.apache.poi.hssf.usermodel.HSSFRow;
    import org.apache.poi.hssf.usermodel.HSSFSheet;
    import org.apache.poi.hssf.usermodel.HSSFWorkbook;
    
    /**
     * Description:
     * 作者：gu.weidong(Jack)
     * date:2018年9月27日
     * ProjectName:ExcelExport
     */
    public class TestExcel {
    	public static void main(String[] args) throws ParseException {
            //创建一个HSSF,对应一个excel
            HSSFWorkbook workbook = new HSSFWorkbook();
            //在webbook中添加一个sheet,对应Excel文件中的sheet
            HSSFSheet sheet = workbook.createSheet("学生表");
            //在sheet中添加表头第0行,注意老版本poi对Excel的行数列数有限制short
            HSSFRow row = sheet.createRow((int) 0);
            //创建单元格，并设置值表头 设置表头居中
            HSSFCellStyle style = workbook.createCellStyle();
            style.setAlignment(HSSFCellStyle.ALIGN_CENTER); // 创建一个居中格式
    
            HSSFCell cell = row.createCell(0);
            cell.setCellValue("学号");
            cell.setCellStyle(style);
            cell = row.createCell(1);
            cell.setCellValue("姓名");
            cell.setCellStyle(style);
            cell = row.createCell(2);
            cell.setCellValue("年龄");
            cell.setCellStyle(style);
            cell = row.createCell(3);
            cell.setCellValue("生日");
            cell.setCellStyle(style);
    
            //写入实体数据
      //      List list = DemoDaoImpl.getStudent();
            List list=new LinkedList<>();
            list.add(1);
            list.add(2);
            list.add(2);
            list.add(2);
            list.add(2);
            for (int i = 0; i < list.size(); i++)
         {
             row = sheet.createRow((int) i + 1);
        //     Student stu = (Student) list.get(i);
             //创建单元格，并设置值
             row.createCell(0).setCellValue(i);
             row.createCell(1).setCellValue("Jack");
             row.createCell(2).setCellValue(20);
             cell = row.createCell(3);
             cell.setCellValue(new SimpleDateFormat("yyyy-MM-dd").format(new Date()));
         }
         //将文件存到指定位置
         try
         {
             FileOutputStream fout = new FileOutputStream("E:/学生表.xls");
             workbook.write(fout);
             fout.close();
         }
         catch (Exception e)
         {
             e.printStackTrace();
         }
      }
    }

显示结果

![70][]

[70]: /images/20210923/7e1c50a79ee4437f87e90bbf6ea4e069.png