POI和EasyExcel导入导出Excel表格

PS：注意版本兼容问题，使用jdk1.8版本

EasyExcel操作Excel表格

一、导入依赖：

<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>3.0.2</version>
</dependency>

二、编写实体类

@NoArgsConstructor
@AllArgsConstructor
@Data
@Builder
public class User {
    @ExcelProperty(value = "用户编号")
    private String userId;
    @ExcelProperty(value = "姓名")
    private String userName;
    @ExcelProperty(value = "性别")
    private String gender;
    @ExcelProperty(value = "工资")
    private Double salary;
    @ExcelProperty(value = "入职时间")
    private Date hireDate;
  
}

三、编写测试类

public class EasyExcelReadToUser {
    String username[] = {"荒天帝石昊","炎帝萧炎","鸿蒙掌控者秦羽","武祖林动","不良帅李星云"};
    Double salary[] = {8897.0,7894.0,6987.0,7894.0,4569.0};
    /**
     * @Author 小虎
     * @Description 
     * 
     * 写入50w条数据
     * 开始时间：1662988028935
     * 结束时间：1662988043958
     * 总耗时：15.023
     *
     *
     * 写入100w条数据
     * 开始时间：1662988304015
     * 结束时间：1662988329978
     * 总耗时：25.963
     *
     * @Date 21:09 2022/9/12
     * @Param []
     * @return java.util.List
     **/
    private List<com.liao.easyExcel0_1.User> getUserData() {
        List<User> users = new ArrayList<>();
        for (int i = 1; i <= 1000000; i++) {
            Random random = new Random();
            int count = random.nextInt(4);
            com.liao.easyExcel0_1.User user = new com.liao.easyExcel0_1.User();
            user.setUserId(UUID.randomUUID().toString());
            user.setUserName(username[count]);
            user.setGender(i % 2 == 0 ? "男" : "女");
            user.setSalary(salary[count]);
            user.setHireDate(new Date());
            users.add(user);
        }
        return users;
    }

    @Test
    public void testWriteExcel() {
        long startTime = System.currentTimeMillis();
        String PATH="F:\\360downloads\\filedownload\\";
        String fileName = PATH+"EasyExcel用户信息.xlsx";

        // 向Excel中写入数据 也可以通过 head(Class) 指定数据模板
        /**
         * @Param fileName:Excel文件名称及路径
         * @Param DemoData:数据实体类
         * @Param 模板:工作表名
         * @Param getUserData():数据集合（写入Excel表格的数据信息）
         * 
         **/
        EasyExcel.write(fileName, User.class)
                .sheet("用户信息")
                .doWrite(getUserData());
        long endTime = System.currentTimeMillis();
        System.out.println("开始时间："+startTime);
        System.out.println("结束时间："+endTime);
        System.out.println("总耗时："+(double)(endTime-startTime)/1000);
    }
}

POI操作Excel表格

基本功能：

对象	描述
HSSF	提供读写Excel(.xls)格式档案的功能
XSSF	提供读写Excel OOXML(.xlsx)格式档案的功能
HWPF	提供读写Word格式档案的功能
HSLF	提供读写PowerPoint格式档案的功能
HDGF	提供读写Visio格式档案的功能

一、导入依赖

使用jdk1.8版本

<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi</artifactId>
	<version>4.1.2</version>
</dependency>
<dependency>
	<groupId>org.apache.poi</groupId>
	<artifactId>poi-ooxml</artifactId>
	<version>4.1.2</version>
</dependency>
<dependency>
	<groupId>com.alibaba</groupId>
	<artifactId>easyexcel</artifactId>
	<version>3.0.2</version>
</dependency>
<dependency>
	<groupId>joda-time</groupId>
	<artifactId>joda-time</artifactId>
	<version>2.10.5</version>
</dependency>

二、测试类

2.1 使用HSSFWorkbook workbook = new HSSFWorkbook();对象创建03版本的Excel.xls表格文件

#文件路径
String PATH="F:\\360downloads\\filedownload\\";

03版本的Excel表格文件（.xls）只能导出65536条数据，超出则发生异常，如下图：

批量导出65536条数据：

 /**
     * @Author 小虎
     * @Description
     * 开始时间：1662994834476
     * 结束时间：1662994840705
     * 总耗时：6.229
     * @Date 23:00 2022/9/12
     * @Param []
     * @return void
     **/
    @Test
    public void testWrite03() throws IOException {
        long startTime = System.currentTimeMillis();
        //1.创建一个工作簿
        HSSFWorkbook workbook = new HSSFWorkbook();
        //2.创建一个工作表
        HSSFSheet sheet = workbook.createSheet("用户信息表");
        HSSFRow row = sheet.createRow(0);//第一行（设置表头）
        HSSFCell cell = row.createCell(0);//第一行第一列
        cell.setCellValue("ID");
        cell = row.createCell(1);//第一行第二例
        cell.setCellValue("书籍名称");
        cell = row.createCell(2);//第一行第三列
        cell.setCellValue("统计时间");
        cell = row.createCell(3);
        cell.setCellValue("作者");
        cell = row.createCell(4);
        cell.setCellValue("价格");
        String author[]= {"辰东","爱吃西红柿","天蚕土豆","唐家三少","罗贯中","吴承恩","若森原创国漫"};
        String bookname[] = {"斗破苍穹","三国演义","星辰变","画江湖之不良人","完美世界","遮天","西游记"};
        String price[] = {"99","78","88","77","100","94","82"};
        String time = new DateTime().toString("yyyy-MM-dd HH:mm:ss");
        for(int i=0;i<65535;i++){
            Random random = new Random();
            int count = random.nextInt(6);
            row = sheet.createRow(i+1);//第i+1行
            cell = row.createCell(0);//第i+1行第一列
            cell.setCellValue(UUID.randomUUID().toString());//赋值给第i+1行第一列
            cell = row.createCell(1);//第i+1行第二列
            cell.setCellValue(bookname[count]);
            cell = row.createCell(2);//第i+1行第三列
            cell.setCellValue(time);
            cell = row.createCell(3);//第i+1行第四列
            cell.setCellValue(author[count]);
            cell = row.createCell(4);//第i+1行第五列
            cell.setCellValue(price[count]);
        }

        //生成一张表  03版本使用.xls结尾
        FileOutputStream fileOutputStream = null;
        fileOutputStream = new FileOutputStream(PATH + "小说统计o3.xls");
        workbook.write(fileOutputStream);
        fileOutputStream.close();
        long endTime = System.currentTimeMillis();
        System.out.println("开始时间："+startTime);
        System.out.println("结束时间："+endTime);
        System.out.println("总耗时："+(double)(endTime-startTime)/1000);

    }

使用HSSFWorkbook workbook = new HSSFWorkbook();导出65536条数据使用3.344秒

使用XSSFWorkbook workbook = new XSSFWorkbook();导出65536条数据使用15.057秒

2.2 使用XSSFWorkbook workbook = new XSSFWorkbook();对象创建07版本的Excel.xls表格文件

07版本的Excel表格文件（.xlsx）相对03版本可导出更多数据：

2.3 使用XSSFWorkbook workbook = new XSSFWorkbook();导出10w海量数

/**
     * @Author 小虎
     * @Description 
     * 10w海量数据导出到Excel.xlsx文件
     * 开始时间：1662970531690
     * 结束时间：1662970548127
     * 所需时间：16.437
     * @Date 16:18 2022/9/12
     **/
    @Test
    public void testWrite07BigData() throws IOException {
        //时间
        long startTime = System.currentTimeMillis();
        //创建工作部
        XSSFWorkbook workbook = new XSSFWorkbook();
        //HSSFWorkbook workbook = new HSSFWorkbook();
        //创建表
        XSSFSheet sheet = workbook.createSheet("海量数据导出07版本");
        //写入数据
        String author[]= {"辰东","爱吃西红柿","天蚕土豆","唐家三少","罗贯中","吴承恩","若森原创国漫"};
        String bookname[] = {"斗破苍穹","三国演义","星辰变","画江湖之不良人","完美世界","遮天","西游记"};
        String price[] = {"99","78","88","77","100","94","82"};
        String time = new DateTime().toString("yyyy-MM-dd HH:mm:ss");
        XSSFRow row = sheet.createRow(0);
        XSSFCell cell = row.createCell(0);
        cell.setCellValue("ID");
        cell = row.createCell(1);//第一行第二例
        cell.setCellValue("书籍名称");
        cell = row.createCell(2);//第一行第三列
        cell.setCellValue("统计时间");
        cell = row.createCell(3);
        cell.setCellValue("作者");
        cell = row.createCell(4);
        cell.setCellValue("价格");
        for(int rowNum=0;rowNum<100000;rowNum++){
            Random random = new Random();
            int count = random.nextInt(6);
            row = sheet.createRow(rowNum+1);
            cell = row.createCell(0);
            cell.setCellValue(UUID.randomUUID().toString());
            cell = row.createCell(1);
            cell.setCellValue(bookname[count]);
            cell = row.createCell(2);
            cell.setCellValue(time);
            cell = row.createCell(3);
            cell.setCellValue(author[count]);
            cell = row.createCell(4);
            cell.setCellValue(price[count]);
        }

        FileOutputStream fileOutputStream = new FileOutputStream(PATH+"10w海量数据导出07版本.xlsx");
        //吧工作簿写入到文件中
        workbook.write(fileOutputStream);
        fileOutputStream.close();
        long endTime = System.currentTimeMillis();
        System.out.println("完成@！！！！");
        System.out.println("开始时间："+startTime);
        System.out.println("结束时间："+endTime);
        System.out.println("所需时间："+(double)(endTime-startTime)/1000);

    }

2.4 大文件写XSSF（SXSSFWorkbook workbook = new SXSSFWorkbook();）

缺点：写数据时速度非常慢，非常耗内存，也会发生内存溢出，如100万条
有点：可以写较大的数据量，如20万条

/**
     * @Author 小虎
     * @Description 大文件写SXSSF
     * 开始时间：1662995450064
     * 结束时间：1662995456178
     * 所需时间：6.114
     * @Date 16:20 2022/9/12
     **/
    @Test
    public void testWrite07BigDataS() throws IOException {
        //时间
        long startTime = System.currentTimeMillis();
        //创建工作部
        SXSSFWorkbook workbook = new SXSSFWorkbook();
        Sheet sheet = workbook.createSheet("海量数据导出07版本");
        String author[]= {"辰东","爱吃西红柿","天蚕土豆","唐家三少","罗贯中","吴承恩","若森原创国漫"};
        String bookname[] = {"斗破苍穹","三国演义","星辰变","画江湖之不良人","完美世界","遮天","西游记"};
        String price[] = {"99","78","88","77","100","94","82"};
        String time = new DateTime().toString("yyyy-MM-dd HH:mm:ss");
        Row row = sheet.createRow(0);
        Cell cell = row.createCell(0);
        cell.setCellValue("ID");
        cell = row.createCell(1);//第一行第二例
        cell.setCellValue("书籍名称");
        cell = row.createCell(2);//第一行第三列
        cell.setCellValue("统计时间");
        cell = row.createCell(3);
        cell.setCellValue("作者");
        cell = row.createCell(4);
        cell.setCellValue("价格");
        for(int rowNum=0;rowNum<200000;rowNum++){
            Random random = new Random();
            int count = random.nextInt(6);
            row = sheet.createRow(rowNum+1);
            cell = row.createCell(0);
            cell.setCellValue(UUID.randomUUID().toString());
            cell = row.createCell(1);
            cell.setCellValue(bookname[count]);
            cell = row.createCell(2);
            cell.setCellValue(time);
            cell = row.createCell(3);
            cell.setCellValue(author[count]);
            cell = row.createCell(4);
            cell.setCellValue(price[count]);
        }

        FileOutputStream fileOutputStream = new FileOutputStream(PATH+"20W海量数据导出07版本SXSSF.xlsx");
        //吧工作簿写入到文件中
        workbook.write(fileOutputStream);
        fileOutputStream.close();
        //清楚临时文件！！
        ((SXSSFWorkbook)workbook).dispose();
        long endTime = System.currentTimeMillis();
        System.out.println("完成@！！！！");
        System.out.println("开始时间："+startTime);
        System.out.println("结束时间："+endTime);
        System.out.println("所需时间："+(double)(endTime-startTime)/1000);

    }