elment UI + EasyExcel 实现 导入

	@ApiOperation("上传")
	@ApiImplicitParams({
			@ApiImplicitParam(name = "file",value = "文件",dataTypeClass = MultipartFile.class,required = true,paramType = "")
	})
	@PostMapping ("/importS")
	public RestResponse<String> uploadExcel(MultipartFile file)throws IOException {
		String HZ = file.getOriginalFilename().substring(file.getOriginalFilename().lastIndexOf("."));
		if(".xlsx.xls".indexOf(HZ) < 0){
			throw new BaseException("500","导入的文件类型不正确，只能导入Excel文件");
		}
		EasyExcel.read(file.getInputStream(), SsqdVO.class,new UploadListenerBySsqd(iSsqdService)).sheet() .doRead();;
		return new RestResponse<> ("ok");
	}　

package com.hopedove.coreserver.vo.sygl;

import com.alibaba.excel.annotation.ExcelProperty;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableName;
import java.io.Serializable;
import java.math.BigDecimal;
import java.util.Date;

import com.hopedove.commons.vo.BaseModel;
import lombok.Data;

/**
 * 璇曠罕娓呭崟
 * @TableName T_JS_SYGL_SSQD
 */
@TableName(value ="T_JS_SYGL_SSQD")
@Data
public class SsqdVO  extends BaseModel implements Serializable {
    /**
     * 璇曠罕娓呭崟ID
     */
    @TableId
    private String SSQDID;
    /**
     * 坯布类型
     */
    @ExcelProperty(value ="试纱类型", index = 0)
    private String PBLX;

    /**
     * 布号
     */
    @ExcelProperty(value ="布号", index = 1)
    private String BH;

    /**
     * 支数
     */
    @ExcelProperty(value ="支数", index = 2)
    private String ZS;

    /**
     * 产地
     */
    @ExcelProperty(value ="产地", index = 3)
    private String CD;

    /**
     * 批号
     */
    @ExcelProperty(value ="批号", index = 4)
    private String PH;


    /**
     * 重量
     */
    @ExcelProperty(value ="重量", index = 5)
    private BigDecimal ZL;

    /**
     * 备注
     */
    @ExcelProperty(value ="备注", index = 6)
    private String REMARK;




    @TableField(exist = false)
    private String GY;


}

package com.hopedove.coreserver.service.impl.sygl;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.nacos.common.utils.CollectionUtils;
import com.hedu.sweet.starter.utils.exception.BusinException;
import com.hopedove.coreserver.service.sygl.ISsqdService;
import com.hopedove.coreserver.vo.sygl.SsqdVO;

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

public class UploadListenerBySsqd extends AnalysisEventListener<SsqdVO>  {


    private ISsqdService iSsqdService;

    public UploadListenerBySsqd(ISsqdService iSsqdService) {
        this.iSsqdService = iSsqdService;
    }


    private List<SsqdVO> list = new ArrayList<>(100);


    @Override
    public void invoke(SsqdVO ssqdVO, AnalysisContext analysisContext) {
        //业务判断
        System.out.println("***"+ssqdVO+"***");
        list.add(ssqdVO);
//        if (list.size() > 100) {
//            wjgbpclService.saveData(list);//保存到数据库
//            list = ListUtils.newArrayListWithExpectedSize(100);
//        }
    }


    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        if (CollectionUtils.isNotEmpty(list)) {
            System.out.println("***结束***");
            System.out.println(list);
            iSsqdService.saveData(list);
        }else{
            throw new BusinException("500","导入的文件为空,请填写信息后重新导入。");
        }
    }
    /**
     * 在这里进行模板的判断
     * @param headMap 存放着导入表格的表头，键是索引，值是名称
     * @param context
     */
    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
        String isNull = "";
        if (context.readRowHolder().getRowIndex() == 0) {
            String[] headList = {"试纱类型","布号","支数","产地","批号","重量","备注"};
            for (int i = 0; i < headList.length; i++) {
                try {
                    if (!headMap.get(i).equals(headList[i])) {
                        isNull = "导入模板不正确，请重新导入";
                        break;
                    }
                } catch (Exception e) {
                    isNull = "导入模板不正确，请重新导入";
                    break;
                }
            }
        }
        if(isNull!=""){
            throw new BusinException("500",isNull);
        }

    }

}

	@Override
	public void saveData(List<SsqdVO> list) {
		//出现空的数据行，只有边框没有值-处理
		list = tableNullLineRemove(list);
		String msg = "";
		if(list.size() > 0){

			if (StringUtil.isEmpty(msg)) {
				// 验证输入数据重复性
				msg = checkMxList(list);
			}

			if (StringUtil.isEmpty(msg)) {
				// excel数据插入数据库
				List<SsqdVO> arr = new ArrayList<>(100);
				for (int i = 0; i < list.size(); i++) {
					SsqdVO bean= list.get(i);
					bean = nullToString(bean);
					arr.add(bean);
				}
				if (CollectionUtils.isNotEmpty(list)) {
					if(!importAdd(list)){//导入
						throw new BusinException("500","导入的文件有效记录数超过1000条，请分批次多次导入");
					}
				}
			}
		}
		if(!StringUtil.isEmpty(msg)){
			throw new BusinException("500",msg);
		}
	}

	/**
	 * 验证输入数据重复性
	 * @param list
	 * @return
	 */
	private String checkMxList(List<SsqdVO> list) {
		List<String> errMsgList = new ArrayList<String>();
		String msg = "";
		if (list.size() > 0) {
			// 把页面的数据进行重复性检验
			for (int i = 0; i < list.size(); i++) {
				SsqdVO mxModel = list.get(i);
				String PBLX = StringUtil.nullToSring(mxModel.getPBLX());
				String BH = StringUtil.nullToSring(mxModel.getBH());
				String ZS = StringUtil.nullToSring(mxModel.getZS());
				String ZL = StringUtil.nullToSring(mxModel.getZL());
				//当纱织类型，布号，支数和重量都为空，那么这条记录既不交验，也不添加
				if(StringUtil.isEmpty(PBLX) && StringUtil.isEmpty(BH) && StringUtil.isEmpty(ZS) && StringUtil.isEmpty(ZL)){
					continue;
				}
				for (int j = 1; j < list.size(); j++) {

					if (i != j) {
						SsqdVO mxModelSec =  list.get(j);
						String PBLXsec = mxModelSec.getPBLX();
						String BHsec = StringUtil.nullToSring(mxModelSec.getBH());
						String ZSsec = StringUtil.nullToSring(mxModelSec.getZS());
						String ZLsec = StringUtil.nullToSring(mxModelSec.getZL());
						//当纱织类型，布号，支数和重量都为空，那么这条记录既不交验，也不添加
						if(StringUtil.isEmpty(PBLXsec) && StringUtil.isEmpty(BHsec) && StringUtil.isEmpty(ZSsec) && StringUtil.isEmpty(ZLsec)){
							continue;
						}
						if(PBLX.equals(PBLXsec) && "2".equals(PBLX)){
							if ((StringUtil.nullToSring(mxModelSec.getBH()))
									.equals(StringUtil.nullToSring(mxModel.getBH()))
									&& (StringUtil.nullToSring(mxModelSec.getZS()))
									.equals(StringUtil.nullToSring(mxModel.getZS()))
									&& (StringUtil.nullToSring(mxModelSec.getZL()))
									.equals(StringUtil.nullToSring(mxModel.getZL()))
									&& (StringUtil.nullToSring(mxModelSec.getSC()))
									.equals(StringUtil.nullToSring(mxModel.getSC()))
									&& (StringUtil.nullToSring(mxModelSec.getSH()))
									.equals(StringUtil.nullToSring(mxModel.getSH()))
									&& (StringUtil.nullToSring(mxModelSec.getGY()))
									.equals(StringUtil.nullToSring(mxModel.getGY()))) {
								msg="导入文档第" + (i+1) + "行数据记录与第" + (j+1)
										+ "行数据记录重复</br>";
								/*errMsgList.add("导入文档第" + (i+1) + "行数据记录与第" + j
										+ "行数据记录重复</br>");*/
							}
						} else {
							if ((StringUtil.nullToSring(mxModelSec.getBH()))
									.equals(StringUtil.nullToSring(mxModel.getBH()))
									&& (StringUtil.nullToSring(mxModelSec.getZS()))
									.equals(StringUtil.nullToSring(mxModel.getZS()))
									&& (StringUtil.nullToSring(mxModelSec.getZL()))
									.equals(StringUtil.nullToSring(mxModel.getZL()))) {
								msg="导入文档第" + (i+1) + "行数据记录与第" + (j+1)
										+ "行数据记录重复</br>";
								/*errMsgList.add("导入文档第" + (i+1) + "行数据记录与第" + j
										+ "行数据记录重复</br>")*/;
							}
						}
					}
				}
			}
		}

		return msg;
	}

	private Boolean importAdd(List<SsqdVO> list) {
		UserDTO userBean = UserUtil.getUserInfo();
		int index = 0 ;
		List <Map <String, String>> addList = new ArrayList <Map <String, String>>();
		for (int i = 0; i < list.size(); i++) {
			SsqdVO entry = list.get(i);
		//保存的处理逻辑
		
		}
		iSsqdDao.insertSSQD(addList);
		iSsqdDao.insertSSRZGY(addList);
		return true;
	}
	private SsqdVO nullToString(SsqdVO params) {
		Map<String,Object> map = new HashMap<>();
		Field[] fields = params.getClass().getDeclaredFields();
		try {
			for (Field field : fields
			) {
				//设置允许通过反射访问私有变量
				field.setAccessible(true);
				map.put(field.getName(),field.get(params)==null? "":field.get(params));
			}

		}catch (Exception e){
			e.printStackTrace();
		}
		return MapUntil.mapToBean(map,new SsqdVO());
	}
	private List<SsqdVO> tableNullLineRemove(List<SsqdVO> list) {
		List<SsqdVO> l = new ArrayList<>();
		//当纱织类型，布号，支数和重量都为空，那么这条记录既不交验，也不添加
		for (SsqdVO model:list
		) {
			if(model.getPBLX()==null && model.getBH() ==null&&model.getZS()==null &&model.getZL()==null){
				continue;
			}else{
				l.add(model);
			}
		}
		return l;
	}