Apache POI 4.0.1版本写入普通Excel文件(兼容 xls 和 xlsx)(三)

基于最新的Apache POI 4.0.1版本来总结一下写入Excel的过程。

代码前准备：

添加4.0.1 poi maven依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.springbootemaildemo</groupId>
    <artifactId>springboot-email-demo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>
    <name>springboot-email-demo</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger2</artifactId>
            <version>2.7.0</version>
        </dependency>
        <dependency>
            <groupId>io.springfox</groupId>
            <artifactId>springfox-swagger-ui</artifactId>
            <version>2.7.0</version>
        </dependency>

        <dependency>
            <groupId>org.jsoup</groupId>
            <artifactId>jsoup</artifactId>
            <version>1.11.3</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>fastjson</artifactId>
            <version>1.2.41</version>
        </dependency>

        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-lang3</artifactId>
            <version>3.10</version>
        </dependency>

        <dependency>
            <groupId>commons-beanutils</groupId>
            <artifactId>commons-beanutils</artifactId>
            <version>1.8.3</version>
        </dependency>
        <dependency>
            <groupId>javax.persistence</groupId>
            <artifactId>persistence-api</artifactId>
            <version>1.0</version>
        </dependency>

<!--poi --> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi</artifactId> <version>4.0.1</version> </dependency> <dependency> <groupId>org.apache.poi</groupId> <artifactId>poi-ooxml</artifactId> <version>4.0.1</version> </dependency>

    </dependencies>
    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>
</project>

DataVo（数据封装类）

package com.springbootemaildemo.excel.b;

/**
 * 读取Excel时，封装读取的每一行的数据
 */
public class DataVo {
    /**
     * 姓名
     */
    private String name;

    /**
     * 年龄
     */
    private Integer age;

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

}

ExcelWriter（写入excel文件主要代码类）

package com.springbootemaildemo.excel.b;

import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class ExcelWriter {
    private static List<String> CELL_HEADS; //列头

    static {
        // 类装载时就载入指定好的列头信息，如有需要，可以考虑做成动态生成的列头
        CELL_HEADS = new ArrayList<>();
        CELL_HEADS.add("姓名");
        CELL_HEADS.add("年龄");
    }

    /**
     * 生成Excel并写入数据信息
     *
     * @param dataList 数据列表
     * @return 写入数据后的工作簿对象
     */
    public static Workbook exportData(List<DataVo> dataList) {
        // 生成xlsx的Excel
        Workbook workbook = new SXSSFWorkbook();

        // 如需生成xls的Excel，请使用下面的工作簿对象，注意后续输出时文件后缀名也需更改为xls
        //Workbook workbook = new HSSFWorkbook();

        // 生成Sheet表，写入第一行的列头
        Sheet sheet = buildDataSheet(workbook);
        //构建每行的数据内容
        int rowNum = 1;
        for (Iterator<DataVo> it = dataList.iterator(); it.hasNext(); ) {
            DataVo data = it.next();
            if (data == null) {
                continue;
            }
            //输出行数据
            Row row = sheet.createRow(rowNum++);
            convertDataToRow(data, row);
        }
        return workbook;
    }

    /**
     * 生成sheet表，并写入第一行数据（列头）
     *
     * @param workbook 工作簿对象
     * @return 已经写入列头的Sheet
     */
    private static Sheet buildDataSheet(Workbook workbook) {
        Sheet sheet = workbook.createSheet();
        // 设置列头宽度
        for (int i = 0; i < CELL_HEADS.size(); i++) {
            sheet.setColumnWidth(i, 4000);
        }
        // 设置默认行高
        sheet.setDefaultRowHeight((short) 400);
        // 构建头单元格样式
        CellStyle cellStyle = buildHeadCellStyle(sheet.getWorkbook());
        // 写入第一行各列的数据
        Row head = sheet.createRow(0);
        for (int i = 0; i < CELL_HEADS.size(); i++) {
            Cell cell = head.createCell(i);
            cell.setCellValue(CELL_HEADS.get(i));
            cell.setCellStyle(cellStyle);
        }
        return sheet;
    }

    /**
     * 设置第一行列头的样式
     *
     * @param workbook 工作簿对象
     * @return 单元格样式对象
     */
    private static CellStyle buildHeadCellStyle(Workbook workbook) {
        CellStyle style = workbook.createCellStyle();
        //对齐方式设置
        style.setAlignment(HorizontalAlignment.CENTER);
        //边框颜色和宽度设置
        style.setBorderBottom(BorderStyle.THIN);
        style.setBottomBorderColor(IndexedColors.BLACK.getIndex()); // 下边框
        style.setBorderLeft(BorderStyle.THIN);
        style.setLeftBorderColor(IndexedColors.BLACK.getIndex()); // 左边框
        style.setBorderRight(BorderStyle.THIN);
        style.setRightBorderColor(IndexedColors.BLACK.getIndex()); // 右边框
        style.setBorderTop(BorderStyle.THIN);
        style.setTopBorderColor(IndexedColors.BLACK.getIndex()); // 上边框
        //设置背景颜色
        style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());
        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);
        //粗体字设置
        Font font = workbook.createFont();
        font.setBold(true);
        style.setFont(font);
        return style;
    }

    /**
     * 将数据转换成行
     *
     * @param data 源数据
     * @param row  行对象
     * @return
     */
    private static void convertDataToRow(DataVo data, Row row) {
        int cellNum = 0;
        Cell cell;
        // 姓名
        cell = row.createCell(cellNum++);
        cell.setCellValue(null == data.getName() ? "" : data.getName());
        // 年龄
        cell = row.createCell(cellNum++);
        if (null != data.getAge()) {
            cell.setCellValue(data.getAge());
        } else {
            cell.setCellValue("");
        }
    }
}

MyTest（测试类）

package com.springbootemaildemo.excel.b;

import org.apache.poi.ss.usermodel.Workbook;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

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

public class MyTest {
    private static final Logger logger = LoggerFactory.getLogger(MyTest.class);

    public static void main(String[] args) {
        // 创建需要写入的数据列表
        List<DataVo> dataVOList = new ArrayList<>();
        DataVo dataVO = new DataVo();
        dataVO.setName("小明");
        dataVO.setAge(18);
        DataVo dataVO2 = new DataVo();
        dataVO2.setName("小花");
        dataVO2.setAge(19);
        dataVOList.add(dataVO);
        dataVOList.add(dataVO2);
        // 写入数据到工作簿对象内
        Workbook workbook = ExcelWriter.exportData(dataVOList);
        // 以文件的形式输出工作簿对象
        FileOutputStream fileOut = null;
        try {
            //E:\files\write-01.xlsx  不用创建，会自动生成的
            String exportFilePath = "E:\\files\\write-01.xlsx";
            File exportFile = new File(exportFilePath);
            if (!exportFile.exists()) {
                exportFile.createNewFile();
            }
            fileOut = new FileOutputStream(exportFilePath);
            workbook.write(fileOut);
            fileOut.flush();
        } catch (
                Exception e) {
            logger.warn("输出Excel时发生错误，错误原因：" + e.getMessage());
        } finally {
            try {
                if (null != fileOut) {
                    fileOut.close();
                }
                if (null != workbook) {
                    workbook.close();
                }
            } catch (IOException e) {
                logger.warn("关闭输出流时发生错误，错误原因：" + e.getMessage());
            }
        }
    }
}