easyexcel简单使用方式

1、导入easyexcel依赖

<!-- 引入 easyexcel 依赖 -->
<dependency>
    <groupId>com.alibaba</groupId>
    <artifactId>easyexcel</artifactId>
    <version>3.0.5</version>
</dependency>

2、创建实体类

package com.joyouth.ts.operation.baseinfo.entities;
import com.alibaba.excel.annotation.ExcelIgnore;
import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;

@Data
public class DemoData {
    @ExcelProperty(value = "区域", index = 0)
    private String areaName;
    @ExcelProperty(value = "间隔", index = 1)
    private String areaName1;
    @ExcelProperty(value = "设备编码", index = 2)
    private String code;
    @ExcelProperty(value = "父级编码", index = 3)
    private String parentCode;
    @ExcelProperty(value = "名称", index = 4)
    private String name;
}

3、读excel

创建单元测试（只能用csv格式，要改成utf-8编码，不然会乱码，xlsx和xls格式会报错，原因未知）

代码地址：https://github.com/alibaba/easyexcel/blob/master/src/test/java/com/alibaba/easyexcel/test/demo/read/ReadTest.java

	// 方法一（不需要自己写监听类）
	@Test
    public void test1() {
        String fileName = "C:\\Users\\JY\\Desktop\\test1.csv";
        //String fileName = "C:/Users/JY/Desktop/test1.csv";
        EasyExcel.read(fileName, DemoData.class, new PageReadListener<DemoData>(dataList -> {
            for (DemoData demoData : dataList) {
                System.out.println(demoData);
            }
        })).sheet().doRead();
    }

    // 方法二（不需要自己写监听类）
	@Test
    public void test2() {
        String fileName = "C:\\Users\\JY\\Desktop\\test1.csv";
        //String fileName = "C:/Users/JY/Desktop/test1.csv";
        EasyExcel.read(fileName, DemoData.class, new ReadListener<DemoData>() {
            private List<DemoData> cachedDataList = new ArrayList<>();
            @Override
            public void invoke(DemoData data, AnalysisContext context) {
                cachedDataList.add(data);
                System.out.println(data);
            }
            @Override
            public void doAfterAllAnalysed(AnalysisContext context) {
                System.out.println(cachedDataList);
            }
        }).sheet().doRead();
    }

4、写excel

代码地址：
https://github.com/alibaba/easyexcel/blob/master/src/test/java/com/alibaba/easyexcel/test/demo/write/WriteTest.java