引入依赖

   <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.2.6</version>
        </dependency>

编写模板

编写代码

public class FillData {

    private String name;
    private Double number;

    public FillData(String name, Double number) {
        this.name = name;
        this.number = number;
    }

    public String getName() {
        return name;
    }

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

    public Double getNumber() {
        return number;
    }

    public void setNumber(Double number) {
        this.number = number;
    }
}

注意：列表填充一定要用实体对象，不能用map

    @RequestMapping("/test")
    public void test() {
   
        // 模板注意 用{} 来表示你要用的变量，{.}表示列表 如果本来就有"{","}" 特殊字符 用"\{","\}"代替
        String templateFileName = "D:\\tools\\code\\excel\\demofillsimple.xlsx";


    
        String fileName = "D:\\tools\\code\\excel\\simpleFill" + System.currentTimeMillis() + ".xlsx";
        
        List<FillData> list = new ArrayList<>();

        FillData s1 = new FillData("张三", 20.0);
        FillData s2 = new FillData("李四", 50.0);
        list.add(s1);list.add(s2);
        FillConfig fillConfig = FillConfig.builder().forceNewRow(true).build();
        ExcelWriter writer = EasyExcel.write(fileName).withTemplate(templateFileName).build();
        WriteSheet sheet1 = EasyExcel.writerSheet().sheetName("1").build();
        // 这里 会填充到第一个sheet页为名称为 1， 
        writer.fill(list,fillConfig,sheet1);
        WriteSheet sheet2 = EasyExcel.writerSheet().sheetName("2").build();
        // 这里 会填充到第一个sheet页为名称为 2， 
        writer.fill(list,fillConfig, sheet2);
        writer.finish();

    }

验证