easyexcel 根据模板导出(excel 数据导入)

阿里巴巴EasyExcel官网：链接
导入步骤：

1.导入Excel依赖
2.编写对应的Excel实体类（使用EasyExcel提供的注解）
3.编写controller

 
            com.alibaba
            easyexcel
            2.2.0-beta2
 

假设我的excel表格长这样，对应实体类写法如下

  @ExcelProperty("药物名称")  核心注解就是这个，这个注解代表着Excel中的标题，
  有几个标题，这里就得写几个注解对应在属性上

package com.cz.pojo;

import com.alibaba.excel.annotation.ExcelProperty;
import com.baomidou.mybatisplus.annotations.TableField;
import com.baomidou.mybatisplus.annotations.TableId;
import com.baomidou.mybatisplus.annotations.TableName;
import com.baomidou.mybatisplus.enums.IdType;
import com.fasterxml.jackson.annotation.JsonFormat;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;

import java.util.Date;


@TableName("medices")
@Data
@AllArgsConstructor
@NoArgsConstructor
public class Medicnes {
    @TableId(type = IdType.AUTO)
    Integer id;

    @ExcelProperty("药物名称")
    String  medice;

    @ExcelProperty("药物来源")
    String  remark;

    @JsonFormat(pattern = "yyyy-MM-dd HH:mm")
    @TableField("ctime")
    Date creatTime;
}

一行代码即可把Excel中的数据转换成List集合

EasyExcel.read(file.getInputStream()).head(Medicnes.class).sheet().
doReadSync();

@RequestMapping(value = "/importExcel",method = RequestMethod.POST)
public JSonObject importExcel(@RequestParam("file") MultipartFile file)  {
        try {
            List  list = EasyExcel.read(file.getInputStream()).head(Medicnes.class).sheet().doReadSync();
            mediceService.insertBatch(list);
            return CommonResult.Sucess();
        } catch (IOException e) {
            log.info("文件导入异常{}",e);
            return  CommonResult.Failure();
        }
    }

先上工具类ExcelUtils

package com.cz.untils;

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.write.builder.ExcelWriterBuilder;
import com.alibaba.excel.write.builder.ExcelWriterSheetBuilder;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.ss.formula.functions.T;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.util.List;



@Slf4j
public class ExcelUtils {
    
    public static  void Export(String fileName, Class excelHead, List data, HttpServletResponse response){
        ServletOutputStream outputStream = setResponseDownLoad(fileName, response);
        ExcelWriterBuilder writeBook = EasyExcel.write(outputStream, excelHead);
        ExcelWriterSheetBuilder sheet = writeBook.sheet(fileName);
        //文件流会自动关闭
        sheet.doWrite(data);
    }
    public static ServletOutputStream setResponseDownLoad(String fileName, HttpServletResponse response){
        try {
            //解决乱码(IE浏览器除外)
            fileName = new String(fileName.getBytes("UTF-8"), "ISO-8859-1");// 只支持字母

            //设置响应的类型
            response.setContentType("application/vnd.ms-excel;charset=utf-8");
            //设置响应的编码格式
            response.setCharacterEncoding("utf8");
            //设置响应头
            response.setHeader("Content-Disposition", "attachment;filename=" + fileName + ".xlsx");
            response.setHeader("Pragma", "public");
            response.setHeader("Cache-Control", "no-store");
            response.addHeader("Cache-Control", "max-age=0");
            return response.getOutputStream();
        } catch (Exception e) {
            log.info("设置响应头异常{}",e);
        }
        return null;
    }
}

对应的参数说明在工具类当中，在浏览器访问即可下载文件，建议使用谷歌浏览器

 @RequestMapping(value = "/testDown",method = RequestMethod.GET)
 public  void testDown(HttpServletResponse response){
     ExcelUtils.Export("药物记录表",Medicnes.class,null,response);
 }

请使用浏览器进行下载测试，postman测试会有个小问题，名称显示乱码；