导出多个sheet

在需求中，会有需要导出多种sheet的情况，那么这里使用easyexcel进行整合

步骤

1、导入依赖

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>3.1.1</version>
        </dependency>

2、Sheet类

主要封装了需要导出的sheet，类，数据等

package com.eshore.easyexcel.entity;

import lombok.Builder;
import lombok.Data;

import java.util.List;

@Data
public class SheetInfoBean<T> {

    /**
     * sheet页名称
     */
    private String sheetName;

    /**
     * sheet标题bean
     */
    private Class<?> headClass;

    /**
     * sheet页数据
     */
    private List<T> dataList;


    public SheetInfoBean(String sheetName, Class<?> headClass, List<T> dataList) {
        this.sheetName = sheetName;
        this.headClass = headClass;
        this.dataList = dataList;
    }
}

3、导出方法

package com.eshore.easyexcel.utils;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.write.metadata.WriteSheet;
import com.eshore.easyexcel.entity.SheetInfoBean;
import lombok.extern.slf4j.Slf4j;

import java.io.File;
import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.List;

@Slf4j
public class EasyExcelUtils {

    private final static String XLSX=".xlsx";



    /**
    * author:walker
    * time: 2024/6/4
    * description:  导出文件
     * prefix：前缀 如： D:/hello/
     * title：文件名称 如： test
     * @return
     */
    public static String exportFile(List<SheetInfoBean> sheetInfoBeans,
                                    String prefix,
                                    String title
    ){
        // 导出文件
        String path=prefix+title+XLSX;
        File dir = new File(prefix);
        if(!dir.exists()){
            dir.mkdirs();
        }
        File file = new File(path);
        try(ExcelWriter excelWriter = EasyExcel.write(file).build()) {
            WriteSheet writeSheet;
            List<String> exclueFields = new ArrayList<>();
            for (SheetInfoBean bean : sheetInfoBeans) {
                Class<?> headClass = bean.getHeadClass();
                Field[] declaredFields = headClass.getDeclaredFields();
                for (Field declaredField : declaredFields) {
                    ExcelProperty annotation = declaredField.getAnnotation(ExcelProperty.class);
                    if(annotation==null) {
                        exclueFields.add(declaredField.getName());
                    }
                }

                // 构建sheet对象
                writeSheet = EasyExcel.writerSheet(bean.getSheetName()).head(bean.getHeadClass()).excludeColumnFieldNames(exclueFields).build();
                // 写出sheet数据
                excelWriter.write(bean.getDataList(), writeSheet);
            }
            // 关流
            excelWriter.finish();
        } catch (Exception e) {
            log.error("导出失败，原因如下:",e);
            // do something you want
        }
        return path;
    }
}

注意：
里面做了一个处理，就是当没有@ExcelProperty的时候，该字段则不导出，否则需要对字段进行excludeColumnFieldNames的设置。相对来说麻烦一些

4、案例

需要使用@ExcelProperty对属性进行配置

1、学生类

package com.walker.sample.easyexcel;

import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;

@Data
public class Student {
    @ExcelProperty("姓名")
    private String name;
    @ExcelProperty("年龄")
    private Integer age;
}

2、老师类

package com.walker.sample.easyexcel;

import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;

@Data
public class Teacher {
    @ExcelProperty("姓名")
    private String name;
    @ExcelProperty("年龄")
    private Integer age;
}

3、测试方法

package com.walker.sample.easyexcel;

import easyexcel.entity.SheetInfoBean;
import easyexcel.utils.EasyExcelUtils;
import lombok.extern.slf4j.Slf4j;
import org.junit.jupiter.api.Test;
import org.springframework.boot.test.context.SpringBootTest;

import java.util.ArrayList;
import java.util.List;

@Slf4j
@SpringBootTest
public class EasyExcelTest {

    @Test
    public void export(){

        List<Student> students = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            Student student = new Student();
            student.setName("学生"+i);
            student.setAge(i);
            students.add(student);
        }

        List<Teacher> teachers = new ArrayList<>();
        for (int i = 0; i < 10; i++) {
            Teacher teacher = new Teacher();
            teacher.setName("老师"+i);
            teacher.setAge(i);
            teachers.add(teacher);
        }



        List<SheetInfoBean> sheetInfoBeans = new ArrayList<>();
        sheetInfoBeans.add(new SheetInfoBean("学生",Student.class,students));
        sheetInfoBeans.add(new SheetInfoBean("老师",Teacher.class,teachers));


        String prefix="D:/";
        EasyExcelUtils.exportFile(sheetInfoBeans,prefix,"学生老师表");
    }
}

4、导出结果