POI导出案例

实体类1
@Data
@ExcelTarget("customerExport")
public class CustomerExport {


    @ExcelIgnore
    private int id;

    @Excel(name = "客户名称",orderNum = "1",needMerge = true)
    private String customerName;

    @Excel(name = "客户编号",orderNum = "2",needMerge = true)
    private String customerNum;

    @Excel(name = "客户地址",orderNum = "3",needMerge = true)
    private String addresss;

    @Excel(name = "客户邮箱",orderNum = "4",needMerge = true)
    private  String companyEmail;

    //联系人
    @ExcelCollection(name = "客户联系人" ,orderNum ="5")
    private List<ContactExport> contacts;

    //上游客户
    @ExcelCollection(name = "上游客户",orderNum ="9")
    private List<UpStreamCustomerExport> upStreamCustomers;

}


实体类2

@Data
@ExcelTarget("contactExport")
public class ContactExport {

    @ExcelIgnore
    private int id;

    @Excel(name = "联系人名称",orderNum = "1",needMerge = true)
    private String contactName;

    @Excel(name = "联系人邮箱",orderNum = "1",needMerge = true)
    private String email;

    @Excel(name = "联系人电话",orderNum = "1",needMerge = true)
    private String tellphone;


    @Excel(name = "备注",orderNum = "1",needMerge = true)
    private String remark;

}

实体类3

@Data
@ExcelTarget("upStreamCustomerExport")
public class UpStreamCustomerExport {

    @ExcelIgnore
    private int id;

    @Excel(name = "上游客户名称",needMerge = true)
    private String upName;

    @Excel(name = "上游客户类型",needMerge = true)
    private String category;

    @Excel(name = "上游客级别",needMerge = true)
    private String level;
}

工具类

package com.itcast.my_easypoi.utils;

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.io.InputStream;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.NoSuchElementException;

public class ExcelUtils {

    /**
     *
     * @param list  数据
     * @param title  标题
     * @param sheetName  sheet页名称
     * @param pojoClass  pojo类型
     * @param fileName  文件名称
     * @param isCreateHeader  是否创建表头
     * @param response
     * @throws IOException
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response)
    throws IOException {
        ExportParams exportParams=new ExportParams(title,sheetName, ExcelType.XSSF);
        exportParams.setCreateHeadRows(isCreateHeader);
        defaultExport(list,pojoClass,fileName,response,exportParams);
    }

    /**
     * excel 导出
     *
     * @param list      数据
     * @param title     标题
     * @param sheetName sheet名称
     * @param pojoClass pojo类型
     * @param fileName  文件名称
     * @param response
     */
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, HttpServletResponse response) throws IOException {
        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName, ExcelType.XSSF));
    }

    /**
     * excel 导出
     *
     * @param list         数据
     * @param pojoClass    pojo类型
     * @param fileName     文件名称
     * @param response
     * @param exportParams 导出参数
     */
    public static void exportExcel(List<?> list, Class<?> pojoClass, String fileName, ExportParams exportParams, HttpServletResponse response) throws IOException {
        defaultExport(list, pojoClass, fileName, response, exportParams);
    }

    /**
     * excel 导出
     *
     * @param list     数据
     * @param fileName 文件名称
     * @param response
     */
    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws IOException {
        defaultExport(list, fileName, response);
    }

    /**
     * 默认导出excel
     *
     * @param list  数据
     * @param pojoClass  pojo类型
     * @param fileName  文件名称
     * @param response
     * @param exportParams  导出参数
     * @throws IOException
     */

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

    /**
     * 默认导出excel导出
     *
     * @param list 数据
     * @param fileName 文件名
     * @param response
     * @throws IOException
     */

    private static  void  defaultExport(List<Map<String,Object>> list,String fileName,HttpServletResponse response) throws IOException {
        Workbook workbook=ExcelExportUtil.exportExcel(list,ExcelType.HSSF);
        downLoadExcel(fileName,response,workbook);
    }


    /**
     *
     * @param fileName 文件名称
     * @param response
     * @param workbook  excel数据
     * @throws IOException
     */
    private static void downLoadExcel(String fileName,HttpServletResponse response,Workbook workbook) throws  IOException{
        try {
            response.setCharacterEncoding("UTF-8");
            response.setHeader("content-Type", "application/vnd.ms-excel");
            response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName + "." + ExcelTypeEnum.XLSX.getValue(), "UTF-8"));
            workbook.write(response.getOutputStream());
        }catch (Exception e){
            throw new IOException(e.getMessage());
        }
    }
    /**
     * excel 导入
     *
     * @param filePath   excel文件路径
     * @param titleRows  标题行
     * @param headerRows 表头行
     * @param pojoClass  pojo类型
     * @param <T>
     * @return
     */
    public static <T> List<T> importExcel(String filePath, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws IOException {
        if (StringUtils.isBlank(filePath)) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        params.setNeedSave(true);
        params.setSaveUrl("/excel/");
        try {
            return ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new IOException("模板不能为空");
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }

    /**
     * excel 导入
     *
     * @param file      excel文件
     * @param pojoClass pojo类型
     * @param <T>
     * @return
     */
    public static <T> List<T> importExcel(MultipartFile file, Class<T> pojoClass) throws IOException {
        return importExcel(file, 1, 1, pojoClass);
    }

    /**
     * excel 导入
     *
     * @param file       excel文件
     * @param titleRows  标题行
     * @param headerRows 表头行
     * @param pojoClass  pojo类型
     * @param <T>
     * @return
     */
    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws IOException {
        return importExcel(file, titleRows, headerRows, false, pojoClass);
    }

    /**
     * excel 导入
     *
     * @param file       上传的文件
     * @param titleRows  标题行
     * @param headerRows 表头行
     * @param needVerfiy 是否检验excel内容
     * @param pojoClass  pojo类型
     * @param <T>
     * @return
     */
    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, boolean needVerfiy, Class<T> pojoClass) throws IOException {
        if (file == null) {
            return null;
        }
        try {
            return importExcel(file.getInputStream(), titleRows, headerRows, needVerfiy, pojoClass);
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }

    /**
     * excel 导入
     *
     * @param inputStream 文件输入流
     * @param titleRows   标题行
     * @param headerRows  表头行
     * @param needVerfiy  是否检验excel内容
     * @param pojoClass   pojo类型
     * @param <T>
     * @return
     */
    public static <T> List<T> importExcel(InputStream inputStream, Integer titleRows, Integer headerRows, boolean needVerfiy, Class<T> pojoClass) throws IOException {
        if (inputStream == null) {
            return null;
        }
        ImportParams params = new ImportParams();
        params.setTitleRows(titleRows);
        params.setHeadRows(headerRows);
        params.setSaveUrl("/excel/");
        params.setNeedSave(true);
        //params.setNeedVerfiy(needVerfiy);
        try {
            return ExcelImportUtil.importExcel(inputStream, pojoClass, params);
        } catch (NoSuchElementException e) {
            throw new IOException("excel文件不能为空");
        } catch (Exception e) {
            throw new IOException(e.getMessage());
        }
    }

}

public enum ExcelTypeEnum {
    XLS("xls"), XLSX("xlsx");
    private String value;

    ExcelTypeEnum(String value) {
        this.value = value;
    }

    public String getValue() {
        return value;
    }

    public void setValue(String value) {
        this.value = value;
    }
}

//具体业务层的导出方法

@Override
public void exportCustomer(HttpServletResponse response) throws IOException {
    List<CustomerExport> export=this.getAllExportData();
    ExcelUtils.exportExcel(export, "客户信息数据", "客户信息", CustomerExport.class, "客户信息", response);
}