阿里的easyExcel导出

easyExcel的gitHub地址：https://github.com/alibaba/easyexcel

开发环境：springboot

1.导入依赖

    com.alibaba
    easyexcel
    1.1.2-beta5

注意：easyexcel需要依赖 poi和poi-ooxml 这里easyexcel的版本是1.1.2，对应poi版本是3.1.7

 

 2.导出带标题的excel

如果导出的只是有一个标题，不需要合并单元格之类的，类型这样的效果

新建一个实体类集成  BaseRowModel 然后使用@ExcelProperty 注解来绑定对象，value位标题中文，index位列的序号从0开始，format可以格式化日期。

/**
 * @author: lockie
 * @Date: 2019/8/5 17:11
 * @Description:
 */
@Data
@ToString
public class OrderExportDTO extends BaseRowModel {

    @ExcelProperty(value = "订单流水号", index = 0)
    private String orderNo;

    @ExcelProperty(value = "订单生成时间", index = 1, format = "yyyy-MM-dd HH:mm:ss")
    private Date createTime;

    @ExcelProperty(value = "订单状态", index = 2)
    private String orderStatusShowStr;

    

}

controller层新增一个导出接口，根据条件查询出数据，然后调用 EasyExcelUtils.writeExcelOneSheet 方法导出，我这里设置了订单号的列宽所以自己new了一个Sheet对象，如果不需要设置列宽可以调用 EasyExcelUtils.writeExcelOneSheet 方法的时候sheet传null。

/**
     * 导出excel
     * @param orderInfoEx
     * @param response
     */
    @GetMapping("/exportChargeExcel")
    public void exportPhpExcel(OrderInfoEx orderInfoEx, HttpServletResponse response) {
        if (null == orderInfoEx) {
            Assert.isTrue(true,"查询参数为空");
        }
        if(null == orderInfoEx.getDealStartDateStr()){
            Assert.isTrue(true,"请选择开始时间");
        }
        if(null == orderInfoEx.getDealEndDateStr()){
            Assert.isTrue(true,"请选择结束时间");
        }

        HashMap queryMap = new HashMap<>();
        queryMap.put("dealStartDateStr", orderInfoEx.getDealStartDateStr());
        queryMap.put("dealEndDateStr", orderInfoEx.getDealEndDateStr());
        queryMap.put("phoneNumber", orderInfoEx.getPhoneNumber());
        queryMap.put("cardNum", orderInfoEx.getCardNum());
        queryMap.put("cardType", orderInfoEx.getCardType());
        queryMap.put("orgName", orderInfoEx.getOrgName());
        queryMap.put("orderStatusShow", orderInfoEx.getOrderStatusShow());
        queryMap.put("city", orderInfoEx.getCity());
        queryMap.put("csCode", orderInfoEx.getCsCode());

        try {
            // 设置列宽
            Map columnWidth = new HashMap();
            columnWidth.put(0, 8000);

            String fileName = "正常订单";
            if (StringUtils.isNotEmpty(orderInfoEx.getExportType())) {
                if ("1".equals(orderInfoEx.getExportType())) {
                    // 查询正常订单导出数据
                    List orderExportDTOList = orderService.getOrderExportByParam(queryMap);

                    Sheet sheet1 = new Sheet(1, 0, OrderExportDTO.class);
                    sheet1.setColumnWidthMap(columnWidth);
                    sheet1.setSheetName(fileName);
                    // 导出
                    EasyExcelUtils.writeExcelOneSheet(response, orderExportDTOList, sheet1, fileName);
                } else {
                    fileName = "异常订单";
                    // 查询异常订单导出数据
                    List exceptionOrderExportDTOList = orderService.getExceptionOrderExportByParam(queryMap);

                    Sheet sheet1 = new Sheet(1, 0, ExceptionOrderExportDTO.class);
                    sheet1.setColumnWidthMap(columnWidth);
                    sheet1.setSheetName(fileName);

                    // 导出
                    EasyExcelUtils.writeExcelOneSheet(response, exceptionOrderExportDTOList, sheet1, fileName);
                }
            } else {
                throw new RuntimeException("导出类型为空");
            }
        } catch (Exception e) {
            logger.error("订单导出异常",e);
            throw new RuntimeException(e);
        }
    }

封装的 EasyExcelUtils 工具类，如果导出单个Sheet的excel则使用 writeExcelOneSheet 方法，如果导出多个sheet则使用 writeExcelMutilSheet 方法

import com.alibaba.excel.EasyExcelFactory;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.metadata.BaseRowModel;
import com.alibaba.excel.metadata.Sheet;
import com.alibaba.excel.support.ExcelTypeEnum;
import com.alibaba.excel.util.CollectionUtils;
import com.alibaba.excel.util.StringUtils;
import lombok.Data;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.Map;

/**
 * @author: lockie
 * @Date: 2019/8/6 10:18
 * @Description:
 */
public class EasyExcelUtils {
    private static final Logger logger = LoggerFactory.getLogger(EasyExcelUtils.class);

    private static Sheet initSheet;

    static {
        initSheet = new Sheet(1, 0);
        initSheet.setSheetName("sheet");
        // 设置自适应宽度
        initSheet.setAutoWidth(Boolean.TRUE);
    }

    /**
     * 读取少于1000行数据
     *
     * @param filePath 文件绝对路径
     * @return
     */
    public static List