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EasyExcel是一个基于Java的简单、省内存的读写Excel的开源项目。

https://github.com/alibaba/easyexcel

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一、导入maven坐标

Lombok可选，不导入的话需要手动写getter、setter、tostring

		<!--  easyexcel-->
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.1.1</version>
        </dependency>
        <!--xls-->
        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi</artifactId>
            <version>3.17</version>
        </dependency>

        <dependency>
            <groupId>org.apache.poi</groupId>
            <artifactId>poi-ooxml</artifactId>
            <version>3.17</version>
        </dependency>
        <!--lombok-->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version> 1.18.16</version>
        </dependency>

二、编写Excel表格实体类

这里@Data就是Lombok的注解，不用自己写getter、setter、tostring

@Data
public class StudentExcel {
    //设置excel表头名称
    @ExcelProperty(value = "学号")
    private Integer sno;
    @ExcelProperty(value = "姓名")
    private String sname;
    @ExcelProperty(value = "性别")
    private Integer ssex;

}

三、写操作

public class TestEasyExcel {

    public static void main(String[] args) {
        String filename = "D:\\student.xlsx";
        testWriteExcel(filename);
    }

    public static void testWriteExcel(String filename){
        //实现excel写的操作

        //调用easyexcel里面的方法实现写操作
        //write方法两个参数：第一个参数文件路径名称，第二个参数实体类class      getData()是要写的入的实体类List
        EasyExcel.write(filename,StudentExcel.class).sheet("学生列表").doWrite(getData());
    }


    //创建方法返回list集合
    private static List<StudentExcel> getData() {
        List<StudentExcel> list = new ArrayList<>();
        String[] name={"tom","jack","tony","小明","小红"};
        for (int i = 0; i < 5; i++) {
            StudentExcel data = new StudentExcel();
            data.setSno(i);
            data.setSname(name[i]);
            data.setSsex(1);
            list.add(data);
        }
        return list;
    }
}

四、读操作

1.编写监听器

public class ExcelListener extends AnalysisEventListener<StudentExcel> {
    //一行一行读取excel内容
    @Override
    public void invoke(StudentExcel data, AnalysisContext analysisContext) {
        System.out.println("excel数据："+data);
    }
    //读取表头内容
    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
        System.out.println("表头："+headMap);
    }
    //读取完成之后
    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) { }
}

2.读取数据

    public static void main(String[] args) {
        String filename = "D:\\student.xlsx";

        testReadExcel(filename);
    }

    public static void testReadExcel(String filename){
        //实现excel读操作

        EasyExcel.read(filename, StudentExcel.class,new ExcelListener()).sheet().doRead();
    }

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