springboot中數據庫數據導出excel實例（附工具）

實體類：

package com.imagedt.pawpaw.model.dto;

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

import java.util.Date;

@Data
@NoArgsConstructor
@AllArgsConstructor
public class UserExportExcelDto {

    @Excel(name = "用戶名", width = 10)
    private String username;

    @Excel(name = "創建時間", format = "yyyy/MM/dd", width = 15)
    private Date createTime;


}

Controller：

/**
     * 導出用戶數據
     * @param response
     */
    @RequestMapping(value = "/export", method = RequestMethod.GET)
    public void exportExcel(HttpServletResponse response){

        List<UserExportExcelDto> userList = new ArrayList<>();
        userList.add(new UserExportExcelDto("tom", new Date()));
        userList.add(new UserExportExcelDto("jack", new Date()));
        userList.add(new UserExportExcelDto("123", new Date()));

        EasyPoiUtil.exportExcel(userList, "用戶數據", "用戶數據", UserExportExcelDto.class, "用戶數據.xls", response);
//        EasyPoiUtil.exportExcel(userList, UserExportExcelDto.class, "用戶數據.xls", response);
    }

使用到的依賴（版本可以更換）：

		<dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-base</artifactId>
            <version>3.0.1</version>
        </dependency>
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-web</artifactId>
            <version>3.0.1</version>
        </dependency>
        <dependency>
            <groupId>cn.afterturn</groupId>
            <artifactId>easypoi-annotation</artifactId>
            <version>3.0.1</version>
        </dependency>

        <!-- 集成springboot web組件 -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

EasyPoiUtil 可以直接用

package com.imagedt.pawpaw.util;
 
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 cn.afterturn.easypoi.excel.entity.enmus.ExcelType;
import org.apache.commons.lang3.StringUtils;
import org.apache.poi.ss.usermodel.Workbook;
import org.springframework.web.multipart.MultipartFile;
 
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;
 
/**
 * @Auther: mousejoo
 * @Date: 2018/10/9 13:54
 * @Description:
 */
public class EasyPoiUtil {
 
    /**
     * 功能描述：複雜導出Excel，包括文件名以及表名。創建表頭
     *
     * @author mousejoo
     * @date 2018/10/9 13:54
     * @param list 導出的實體類
     * @param title 表頭名稱
     * @param sheetName sheet表名
     * @param pojoClass 映射的實體類
     * @param isCreateHeader 是否創建表頭
     * @param fileName
     * @param response
     * @return
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) {
        ExportParams exportParams = new ExportParams(title, sheetName);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list, pojoClass, fileName, response, exportParams);
    }

    /**
     * 功能描述：複雜導出Excel，包括文件名以及表名,不創建表頭
     * @author mousejoo
     * @date 2018/10/9 13:54
     * @param list 導出的實體類
     * @param pojoClass 映射的實體類
     * @param fileName
     * @param response
     * @return
     */
    public static void exportExcel(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response) {
        defaultExport(list, pojoClass, fileName, response, new ExportParams());
    }
 
    /**
     * 功能描述：複雜導出Excel，包括文件名以及表名,不創建表頭
     *
     * @author mousejoo
     * @date 2018/10/9 13:54
     * @param list 導出的實體類
     * @param title 表頭名稱
     * @param sheetName sheet表名
     * @param pojoClass 映射的實體類
     * @param fileName
     * @param response
     * @return
     */
    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));
    }
 
    /**
     * 功能描述：Map 集合導出
     *
     * @author mousejoo
     * @date 2018/10/9 13:54
     * @param list 實體集合
     * @param fileName 導出的文件名稱
     * @param response
     * @return
     */
    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        defaultExport(list, fileName, response);
    }
 
    /**
     * 功能描述：默認導出方法
     *
     * @author mousejoo
     * @date 2018/10/9 13:54
     * @param list 導出的實體集合
     * @param fileName 導出的文件名
     * @param pojoClass pojo實體
     * @param exportParams ExportParams封裝實體
     * @param response
     * @return
     */
    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) {
        Workbook workbook = ExcelExportUtil.exportExcel(exportParams, pojoClass, list);
        if (workbook != null) {
            downLoadExcel(fileName, response, workbook);
        }
    }
 
    /**
     * 功能描述：Excel導出
     *
     * @author mousejoo
     * @date 2018/10/9   15:35
     * @param fileName 文件名稱
     * @param response
     * @param workbook Excel對象
     * @return
     */
    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) {
            throw new  RuntimeException(e);
        }
    }
 
    /**
     * 功能描述：默認導出方法
     *
     * @author mousejoo
     * @date 2018/7/23 15:33
     * @param list 導出的實體集合
     * @param fileName 導出的文件名
     * @param response
     * @return
     */
    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) {
        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);
        if (workbook != null) ;
        downLoadExcel(fileName, response, workbook);
    }
 
 
    /**
     * 功能描述：根據文件路徑來導入Excel
     *
     * @author mousejoo
     * @date 2018/10/9 14:17
     * @param filePath 文件路徑
     * @param titleRows 表標題的行數
     * @param headerRows 表頭行數
     * @param pojoClass Excel實體類
     * @return
     */
    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) {
        //判斷文件是否存在
        if (StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        List<T> list = null;
        try {
            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new RuntimeException("模板不能爲空");
        } catch (Exception e) {
            e.printStackTrace();
 
        }
        return list;
    }
 
    /**
     * 功能描述：根據接收的Excel文件來導入Excel,並封裝成實體類
     *
     * @author mousejoo
     * @date 2018/10/9 14:17
     * @param file 上傳的文件
     * @param titleRows 表標題的行數
     * @param headerRows 表頭行數
     * @param pojoClass Excel實體類
     * @return
     */
    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) {
            throw new RuntimeException("excel文件不能爲空");
        } catch (Exception e) {
            throw new RuntimeException(e.getMessage());
 
        }
        return list;
    }
 
 
}