EasyExcel Demo

https://github.com/alibaba/easyexcel/

  <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.1.1</version>
        </dependency>

实体类

@Data
public class DemoData {
    //设置表头名称
    @ExcelProperty(value = "学生编号", index = 0)
    private int sno;
    //设置表头名称
    @ExcelProperty(value = "学生姓名", index = 1)
    private String sname;

映射器

public class ExcelListener extends AnalysisEventListener<DemoData> {

    //创建list集合封装最终的数据
    List<DemoData> list = new ArrayList<DemoData>();

    //一行一行去读取excle内容
    @Override
    public void invoke(DemoData user, AnalysisContext analysisContext) {
        System.out.println("***" + user);
        list.add(user);
    }

    //读取excel表头信息
    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
        System.out.println("表头信息：" + headMap);
    }

    //读取完成后执行
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
    }
}

Demo

public class Test {

    public static void main(String[] args) {
        writeExcel1();
        try {
            readExcel();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //循环设置要添加的数据，最终封装到list集合中
    private static List<DemoData> data() {
        List<DemoData> list = new ArrayList<DemoData>();
        for (int i = 0; i < 10; i++) {
            DemoData data = new DemoData();
            data.setSno(i);
            data.setSname("张三" + i);
            list.add(data);
        }
        return list;
    }

    //方式一
    private static void writeExcel1() {
        // 写法1
        String fileName = "D:\\桌面\\Students.xls";
        // 这里 需要指定写用哪个class去写，然后写到第一个sheet，名字为模板 然后文件流会自动关闭
        // 如果这里想使用03 则 传入excelType参数即可
        EasyExcel.write(fileName, DemoData.class).sheet("写入方法一").doWrite(data());
    }

    //方式二
    private static void writeExcel2() {
        // 写法2，方法二需要手动关闭流
        String fileName = "D:\\桌面\\Students.xls";
        // 这里 需要指定写用哪个class去写
        ExcelWriter excelWriter = EasyExcel.write(fileName, DemoData.class).build();
        WriteSheet writeSheet = EasyExcel.writerSheet("写入方法二").build();
        excelWriter.write(data(), writeSheet);
        /// 千万别忘记finish 会帮忙关闭流
        excelWriter.finish();
    }

    //Read
    private static void readExcel() throws Exception {
        //方式一
        String fileName = "D:\\桌面\\Students.xls";
        EasyExcel.read(fileName, DemoData.class, new ExcelListener()).sheet().doRead();
        //方式二
        InputStream in = new BufferedInputStream(new FileInputStream(fileName));
        ExcelReader excelReader = EasyExcel.read(in, DemoData.class, new ExcelListener()).build();
        ReadSheet readSheet = EasyExcel.readSheet(0).build();
        excelReader.read(readSheet);
        // 这里千万别忘记关闭，读的时候会创建临时文件，到时磁盘会崩的
        excelReader.finish();
    }
}