最新版的easyexcel2.0升級后原有的導入導出書寫方法就已經過時了，本文記錄了最新版的EasyExcel工具類的整合與使用。
最新版書寫比原來要簡單不少，性能也有所提高，推薦換到最新版。

引入最新的依賴

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.4.0</version>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.2.6</version>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>1.18.12</version>
            <scope>provided</scope>
        </dependency>

主要用到了easyexcel、hutool工具類和lombok插件

導入導出的實體類

package org.geekboy.bean;

import com.alibaba.excel.annotation.ExcelProperty;
import com.alibaba.excel.annotation.write.style.ColumnWidth;
import com.alibaba.excel.annotation.write.style.ContentRowHeight;
import com.alibaba.excel.annotation.write.style.HeadRowHeight;
import lombok.Data;

/**
 * @ClassName ExportModel
 * @Description 導出模型
 * @Author zhangwei
 * @Version 1.0.0
 * @Date 2020/4/1 20:55
 */
@ContentRowHeight(20)
@HeadRowHeight(25)
@ColumnWidth(25)
@Data
public class ExportModel  {

    @ExcelProperty(value = "姓名" ,index = 0)
    private String name;

    @ExcelProperty(value = "性別" ,index = 1)
    private String sex;

    @ExcelProperty(value = "年齡" ,index = 2)
    private Integer age;

}

package org.geekboy.bean;

import com.alibaba.excel.annotation.ExcelProperty;
import lombok.Data;

/**
 * @ClassName ImportModel
 * @Description 導入模型
 * @Author zhangwei
 * @Version 1.0.0
 * @Date 2020/4/1 20:54
 */
@Data
public class ImportModel {

    @ExcelProperty(index = 0)
    private String date;

    @ExcelProperty(index = 1)
    private String author;

    @ExcelProperty(index = 2)
    private String book;

}

導入導出工具類

package org.geekboy.common;

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;

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

/**
 * @Author zhang wei
 * @Description 監聽類
 * @Date 2020-08-13
 */
public class ExcelListener extends AnalysisEventListener {
    /**
     * 可以通過實例獲取該值
     */
    private List<Object> dataList = new ArrayList<>();

    @Override
    public void invoke(Object object, AnalysisContext context) {
        //數據存儲到list，供批量處理，或后續自己業務邏輯處理。
        dataList.add(object);
        handleBusinessLogic();
          /*
        如數據過大，可以進行定量分批處理
        if(dataList.size()>=200){
            handleBusinessLogic();
            dataList.clear();
        }
         */
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext context) {
        //非必要語句，查看導入的數據
        System.out.println("導入的數據條數為: " + dataList.size());
    }

    //根據業務自行實現該方法，例如將解析好的dataList存儲到數據庫中
    private void handleBusinessLogic() {

    }

    public List<Object> getDataList() {
        return dataList;
    }

    public void setDataList(List<Object> dataList) {
        this.dataList = dataList;
    }
}

package org.geekboy.common;

import cn.hutool.core.convert.Convert;
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelReader;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.read.metadata.ReadSheet;
import com.alibaba.excel.write.metadata.WriteSheet;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * @Author zhang wei
 * @Description Excel讀寫工具類
 * @Date 2020-08-13
 */
public class ExcelUtil {


    /**
     * 讀取Excel（多個sheet可以用同一個實體類解析）
     * @param excelInputStream
     * @param fileName
     * @param clazz
     * @param <T>
     * @return
     */
    public static <T> List<T> readExcel(InputStream excelInputStream, String fileName,Class<T> clazz) {
        ExcelListener excelListener = new ExcelListener();
        ExcelReader excelReader = getReader(excelInputStream, fileName,clazz, excelListener);
        if (excelReader == null) {
            return new ArrayList<>();
        }
        List<ReadSheet> readSheetList = excelReader.excelExecutor().sheetList();
        for (ReadSheet readSheet : readSheetList) {
            excelReader.read(readSheet);
        }
        excelReader.finish();
        return Convert.toList(clazz, excelListener.getDataList());
    }

    /**
     * 導出Excel(一個sheet)
     *
     * @param response  HttpServletResponse
     * @param list      數據list
     * @param fileName  導出的文件名
     * @param sheetName 導入文件的sheet名
     * @param clazz     實體類
     */
    public static <T> void writeExcel(HttpServletResponse response, List<T> list, String fileName, String sheetName, Class<T> clazz) {

        OutputStream outputStream = getOutputStream(response, fileName);
        ExcelWriter excelWriter = EasyExcel.write(outputStream, clazz).build();
        WriteSheet writeSheet = EasyExcel.writerSheet(sheetName).build();
        excelWriter.write(list, writeSheet);
        excelWriter.finish();
    }


    /**
     * 導出時生成OutputStream
     */
    private static OutputStream getOutputStream(HttpServletResponse response, String fileName) {
        //創建本地文件
        String filePath = fileName + ".xlsx";
        File file = new File(filePath);
        try {
            if (!file.exists() || file.isDirectory()) {
                file.createNewFile();
            }
            fileName = new String(filePath.getBytes(), "ISO-8859-1");
            response.addHeader("Content-Disposition", "filename=" + fileName);
            return response.getOutputStream();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 返回ExcelReader
     *
     * @param excel         文件
     * @param clazz         實體類
     * @param excelListener
     */
    private static <T> ExcelReader getReader(InputStream inputStream, String filename, Class<T> clazz, ExcelListener excelListener) {
        try {
            if (filename == null ||
                    (!filename.toLowerCase().endsWith(".xls") && !filename.toLowerCase().endsWith(".xlsx"))) {
                return null;
            }
            ExcelReader excelReader = EasyExcel.read(inputStream, clazz, excelListener).build();
            inputStream.close();
            return excelReader;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;
    }
}

測試類

package org.geekboy.test;

import org.geekboy.bean.ExportModel;
import org.geekboy.bean.ImportModel;
import org.geekboy.common.ExcelUtil;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

@Controller
public class ExcelTestController {

    @PostMapping(value = "/import")
    public List<ImportModel> read(MultipartFile excel) throws IOException {
        return ExcelUtil.readExcel(excel.getInputStream(), excel.getOriginalFilename(), ImportModel.class);
    }

    @GetMapping(value = "/export")
    public void writeExcel(HttpServletResponse response) {
        List<ExportModel> list = getList();
        String fileName = "Excel導出測試";
        String sheetName = "sheet1";
        ExcelUtil.writeExcel(response, list, fileName, sheetName, ExportModel.class);
    }

    private List<ExportModel> getList() {
        List<ExportModel> modelList = new ArrayList<>();
        ExportModel firstModel = new ExportModel();
        firstModel.setName("李明");
        firstModel.setSex("男");
        firstModel.setAge(20);
        modelList.add(firstModel);
        ExportModel secondModel = new ExportModel();
        secondModel.setName("珍妮");
        secondModel.setSex("女");
        secondModel.setAge(19);
        modelList.add(secondModel);
        return modelList;
    }
}

鏡像地址

http://www.zhangwei.wiki/

總結

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