springboot+easypoi实现Excel导入导出

1.导入easypoi依赖：

<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-base</artifactId>
    <version>3.0.3</version>
</dependency>
<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-web</artifactId>
    <version>3.0.3</version>
</dependency>
<dependency>
    <groupId>cn.afterturn</groupId>
    <artifactId>easypoi-annotation</artifactId>
    <version>3.0.3</version>
</dependency>

2.创建工具类：

import cn.afterturn.easypoi.excel.ExcelExportUtil;
import cn.afterturn.easypoi.excel.ExcelImportUtil;
import cn.afterturn.easypoi.excel.entity.ExportParams;
import cn.afterturn.easypoi.excel.entity.ImportParams;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.NoSuchElementException;

public class ExcelUtil {

    /**
     * Excel导入
     * @param file Excel文件
     * @param titleRows 标题行数
     * @param headerRows 表头行数
     * @param pojoClass 实体类
     * @param <T> 泛型
     * @return 数据集合
     */
    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass){
        if (file == null){
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);
        }catch (NoSuchElementException e){
            System.out.println("excel文件不能为空");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return list;
    }

    /**
     * Excel导出
     * @param list 数据集合
     * @param title 标题
     * @param sheetName sheet名称
     * @param pojoClass 实体类
     * @param fileName 文件名
     * @param response 请求信息
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,String fileName, HttpServletResponse response){
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));
    }

    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams,pojoClass,list);
        downLoadExcel(fileName, response, workbook);
    }

    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) {
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));
            workbook.write(response.getOutputStream());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}

3.创建实体类：

import cn.afterturn.easypoi.excel.annotation.Excel;
import lombok.Data;

@Data
public class Student {

	//注解内的name对应的是Excel文件的表头
    @Excel(name = "名字")
    private String name;

    @Excel(name = "年龄")
    private Integer age;

    @Excel(name = "住址")
    private String address;

}

4.创建Controller接口文件：

/**
 * Excel导入
 * @param file 文件
 * @return 返回信息
 */
@PostMapping("/importExcel")
public JSONObject importExcel(@RequestParam("file") MultipartFile file) {
    List<Student> list = ExcelUtil.importExcel(file, 1, 1, Student.class);
    if (list == null) {
    	//Excel文件是空或格式不正确
    }
    for (Student student : list)
    {
    	//插入数据库操作
    }
    return CommonUtil.successJson("导入成功");
}

/**
 * Excel导出
 * @param response 请求信息
 * @param params 数据库查询时参数
 * @return 返回信息
 */
@PostMapping("/exportExcel")
public JSONObject importExcel(HttpServletResponse response, @RequestBody Student params) {
	//list为数据库中查出的数据
    ExcelUtil.exportExcel(list, "学生档案", "sheet1", Student.class, "学生档案.xls",response);
    return CommonUtil.successJson("导出成功");
}