将List> 类型数据导出到Excel文件

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将List> 类型数据导出到Excel文件

1.pom.xml中添加依赖

<!--lombok-->
		<dependency>
			<groupId>org.projectlombok</groupId>
			<artifactId>lombok</artifactId>
			<optional>true</optional>
		</dependency>
<!--poi start-->
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi</artifactId>
			<version>3.15</version>
		</dependency>
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-ooxml-schemas</artifactId>
			<version>3.15</version>
		</dependency>
		<dependency>
			<groupId>org.apache.poi</groupId>
			<artifactId>poi-ooxml</artifactId>
			<version>3.15</version>
		</dependency>
<!--poi end-->

2.新建类DataToExcel.java

import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import org.apache.poi.xssf.usermodel.*;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * 将List> 类型数据导出到Excel文件
 */
public class DataToExcel {
	@Data
	@AllArgsConstructor
	@NoArgsConstructor
	public static class Student {
		String name;
		int age;
		String sex;
	}

	/**
	 * src:定义下载的文件路径
	 * @param src
	 */
	public static void createExcel(String src) {
		System.out.println("数据加载...");
		List<Student> list = new ArrayList<>();
		Student s1 = new Student("张三", 22, "男");
		Student s2 = new Student("李四", 22, "男");
		Student s3 = new Student("王五", 22, "男");
		Student s4 = new Student("赵敏", 22, "女");
		Student s5 = new Student("张无忌", 22, "男");
		list.add(s1);
		list.add(s2);
		list.add(s3);
		list.add(s4);
		list.add(s5);
		System.out.println("数据加载完成...");
		List<Map<String, Object>> mapArrayList = new ArrayList<>();
		list.forEach(o -> {
			Map<String, Object> map = new HashMap<>();
			map.put("姓名", o.getName());
			map.put("年龄", o.getAge());
			map.put("性别", o.getSex());
			mapArrayList.add(map);
		});

		System.out.println("数据转成Excel...");
		// 定义一个新的工作簿
		XSSFWorkbook wb = new XSSFWorkbook();
		// 创建一个Sheet页
		XSSFSheet sheet = wb.createSheet("First sheet");
		//设置行高
		sheet.setDefaultRowHeight((short) (2 * 256));
		//设置列宽
		sheet.setColumnWidth(0, 4000);
		sheet.setColumnWidth(1, 4000);
		sheet.setColumnWidth(2, 4000);
		XSSFFont font = wb.createFont();
		font.setFontName("宋体");
		font.setFontHeightInPoints((short) 16);
		//获得表格第一行
		XSSFRow row = sheet.createRow(0);
		//根据需要给第一行每一列设置标题
		XSSFCell cell = row.createCell(0);
		cell.setCellValue("姓名");
		cell = row.createCell(1);
		cell.setCellValue("年龄");
		cell = row.createCell(2);
		cell.setCellValue("性别");
		XSSFRow rows;
		XSSFCell cells;
		//循环拿到的数据给所有行每一列设置对应的值
		for (int i = 0; i < mapArrayList.size(); i++) {

			// 在这个sheet页里创建一行
			rows = sheet.createRow(i + 1);
			// 该行创建一个单元格,在该单元格里设置值
			String name = mapArrayList.get(i).get("姓名").toString();
			int age = (int) mapArrayList.get(i).get("年龄");
			String sex = mapArrayList.get(i).get("性别").toString();
			cells = rows.createCell(0);
			cells.setCellValue(name);
			cells = rows.createCell(1);
			cells.setCellValue(age);
			cells = rows.createCell(2);
			cells.setCellValue(sex);
		}
		try {
			File file = new File(src);
			FileOutputStream fileOutputStream = new FileOutputStream(file);
			wb.write(fileOutputStream);
			wb.close();
			fileOutputStream.close();
		} catch (IOException e) {
			e.printStackTrace();
		}

	}

	public static void main(String[] args) {
		createExcel("d:/aaaa.xls");
	}

}

3.文件结果

文件aaaa.xls里的数据