1.导入依赖
xml
<!-- poi依赖-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>4.0.1</version>
</dependency>
<!-- poi对于excel 2007的支持依赖-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>4.0.1</version>
</dependency>
<!-- poi对于excel 2007的支持依赖-->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml-schemas</artifactId>
<version>4.0.1</version>
</dependency>2.代码实现
java
package com.example.exceldemo;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.core.io.ClassPathResource;
import java.io.*;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
public class EasyExcelTest {
public static void main(String[] args) throws Exception {
InputStream fis = null;
OutputStream outputStream= null;
Workbook wb = null;
try {
String fileName = "测试单位"+ UUID.randomUUID() + ".xlsx";
String filePath = "D:\\report\\"+fileName;
//1.获取数据
List<ExcelVo> list = new ArrayList<>();
list.add(new ExcelVo(1,"1221","黄山"));
list.add(new ExcelVo(2,"3333","河水"));
list.add(new ExcelVo(3,"6666","青石"));
//2.获取模板
fis = new ClassPathResource("templates/report_template.xlsx").getInputStream();
File file=new File(filePath);
if (!file.exists()) {
file.createNewFile();
}
outputStream = new FileOutputStream(file);
//3.根据模板创建工作簿
wb = new XSSFWorkbook(fis);
//4.读取工作表
Sheet sheet = wb.getSheetAt(0);
CellStyle styles[] = new CellStyle[row.getLastCellNum()];
//5.抽取第2行的公共样式 , 因为第一行 为标题 第2行是数据 下标为1
Row row = sheet.getRow(1);
CellStyle styles[] = new CellStyle[row.getLastCellNum()];
Cell cell = null;
for (int i = 0; i < row.getLastCellNum(); i++) {
cell = row.getCell(i);
styles[i] = cell.getCellStyle();
}
//5.构造单元格
int rowIndex=1;
//方式一 手动
for (ExcelVo vo2:list) {
//创建每一行，同excel的第二行开始
row= sheet.createRow(rowIndex++);
//第一列
int i=0;
cell = row.createCell(i++);
cell.setCellStyle(styles[0]);
cell.setCellValue(vo2.getId());//写入数据 序号
//第二列
cell = row.createCell(i++);
cell.setCellStyle(styles[0]);
cell.setCellValue(vo2.getCode());
//第三列（注：最后一列不用i++,前面的必须i++）
cell = row.createCell(i);
cell.setCellStyle(styles[0]);
cell.setCellValue(vo2.getName());
}
//方式二 动态
for (ExcelVo t:list) {
//创建每一行，同excel的第二行开始
row = sheet.createRow(rowIndex++);
Field[] fields=t.getClass().getDeclaredFields();//获取filed
for (int i = 0; i < fields.length; i++) {
Field field=fields[i];
field.setAccessible(true);//设置私有属性可以访问
Object val = field.get(t);//获取值
if (val==null)val="";
cell = row.createCell(i);
cell.setCellStyle(styles[0]);//设置单元格样式
cell.setCellValue(val.toString());//写入数据
}
}
wb.write(outputStream);//写入数据
} catch (Exception e) {
throw new Exception(e);
} finally {
fis.close();
wb.close();
outputStream.close();
}
}
}3.模板
