Java利用EasyExcel实现模板读取和复杂表格填充

FillConfig fillConfig = FillConfig.builder().forceNewRow(true).build();//表示开启组合填充换行填充

@Data
@NoArgsConstructor
@AllArgsConstructor
@Builder //通过自动生成的构建器模式创建对象
public class TeacherInfo {
	@ExcelProperty("年龄")
 	private int age;//年龄
 	@ExcelProperty("姓名")
    private String name;//姓名
    @ExcelProperty("科目")
    private String subject;//科目
}

package com.fasterres.demo.blog;

import com.alibaba.excel.annotation.format.DateTimeFormat;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class StudentInfo {
    private String id;//编号
    private String studentname;//姓名
    private String sex;//性别

    @DateTimeFormat("yyyy/MM/dd")
    private Date birthday;//生日
}

import cn.hutool.core.date.DateUnit;
import cn.hutool.core.date.DateUtil;
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.alibaba.excel.write.metadata.fill.FillConfig;
import com.alibaba.excel.write.metadata.fill.FillWrapper;
import com.fasterres.demo.blog.StudentInfo;
import com.fasterres.demo.blog.TeacherInfo;
import org.springframework.core.io.ClassPathResource;

import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.List;

public class ExcelWriteTest {
    public static void main(String[] args) throws Exception {

        // 1.写入文件方式
        String filePath = "D:\\log\\stduent_01.xlsx";
        InputStream templateFile = new FileInputStream(filePath);
        String targetFile = "D:\\学生信息统计2.xlsx";
        ExcelWriter excelWriter =EasyExcel.write(targetFile).withTemplate(templateFile).build();

        // 2.加载模板，配置在项目工程下的 写入io
       /* ClassPathResource resource=new ClassPathResource("template/stduent_01.xlsx");

        InputStream templateInputStream = resource.getInputStream();*/
        //1.写入io流
        //ByteArrayOutputStream outputStream=new ByteArrayOutputStream(1024);
		// 写入excelWriter对象
        //ExcelWriter excelWriter= EasyExcel.write(outputStream).withTemplate(templateInputStream ).build();

		//2.最简单的写入是读取数据写入单行正常表头
		//List<TeacherInfo> teacherInfos=new ArrayList<>();
		//EasyExcel.write(outputStream,TeacherInfo.class).sheet("老师信息统计").doWrite(teacherInfos);
        
        WriteSheet sheet = EasyExcel.writerSheet().build();


        // 当前日期
        HashMap<String, String> dateMap = new HashMap<String, String>();
        dateMap.put("date", "2025-02-06");
        //填充单个字段信息
        excelWriter.fill(dateMap,sheet);

        //填充单个对象信息
/*
        TeacherInfo teacher=TeacherInfo.builder()
                .age(33)
                .name("张竹")
                .build();
        excelWriter.fill(teacher,sheet);
*/

        //换行填充
        FillConfig fillConfig = FillConfig.builder().forceNewRow(true).build();
        //多次填充list,可以用new FillWrapper(）申明别名
        //填充第一个list
        List<TeacherInfo> teacherInfoList=new ArrayList();
        TeacherInfo teacher2=TeacherInfo.builder()
                .age(22)
                .name("张竹")
                .subject("数学")
                .build();
        TeacherInfo teacher3=TeacherInfo.builder()
                .age(33)
                .name("power")
                .subject("英语")
                .build();
        teacherInfoList.add(teacher2);
        teacherInfoList.add(teacher3);
        excelWriter.fill(new FillWrapper("t1",teacherInfoList),fillConfig ,sheet);
        //填充第二个list对象


        List<StudentInfo> studentInfo = new ArrayList<>();
        StudentInfo Student1=new  StudentInfo("1", "张三", "男", DateUtil.parse("2022/12/12"));
        StudentInfo Student2=new  StudentInfo("2", "王芳", "女",  DateUtil.parse("2025/02/15"));
        studentInfo.add(Student1);
        studentInfo.add(Student2);
        excelWriter.fill(new FillWrapper("t2",studentInfo),fillConfig ,sheet);
        //结束填充
        excelWriter.finish();



    }
}

excelWriter.fill(new FillWrapper(“t1”,teacherInfoList),fillConfig ,sheet);