springboot集成easyExcel

1.excel的上传下载,我们调用普通的解析excel的jar包比较复杂而且使用非常不方便,集成easyexcel之后在 springboot中如鱼得水,开发时长大大缩短时间

集成首先导入maven包,在导出的时候会缺少包 故需要导入asm jar

<dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>easyexcel</artifactId>
            <version>2.2.6</version>
        </dependency>
        <dependency>
            <groupId>org.ow2.asm</groupId>
            <artifactId>asm</artifactId>
            <version>7.1</version>
        </dependency>

然后我们需要编辑一个工具类

import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.EasyExcelFactory;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.support.ExcelTypeEnum;
import com.alibaba.excel.write.handler.WriteHandler;
import 
import org.apache.poi.ss.formula.functions.T;

import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.List;
import java.util.Map;
import java.util.Set;

/**
 * @ProjectName: knowlogy
 * @Package: know.utils.report
 * @ClassName: EasyExcelUtil
 * @Author: 韩惠德
 * @Description: 解析excel工具类
 * @Date: 2020/4/24 17:22
 * @Version: 1.0
 */
public class EasyExcelUtil {
    /**
     * 同步无模型读(默认读取sheet0,从第2行开始读)
     *
     * @param filePath
     * @return
     */
    public static List<Map<Integer, String>> syncRead(String filePath) {
        return EasyExcelFactory.read(filePath).sheet().doReadSync();
    }

    /**
     * 同步无模型读(默认表头占一行,从第2行开始读)
     *
     * @param filePath
     * @param sheetNo  sheet页号,从0开始
     * @return
     */
    public static List<Map<Integer, String>> syncRead(String filePath, Integer sheetNo) {

        return EasyExcelFactory.read(filePath).sheet(sheetNo).doReadSync();
    }

    /**
     * 同步无模型读(指定sheet和表头占的行数)
     *
     * @param inputStream
     * @param sheetNo     sheet页号,从0开始
     * @param headRowNum  表头占的行数,从0开始(如果要连表头一起读出来则传0)
     * @return List>
     */
    public static List<Map<Integer, String>> syncRead(InputStream inputStream, Integer sheetNo, Integer headRowNum) {
        return EasyExcelFactory.read(inputStream).sheet(sheetNo).headRowNumber(headRowNum).doReadSync();
    }

    /**
     * 同步无模型读(指定sheet和表头占的行数)
     *
     * @param file
     * @param sheetNo    sheet页号,从0开始
     * @param headRowNum 表头占的行数,从0开始(如果要连表头一起读出来则传0)
     * @return List>
     */
    public static List<Map<Integer, String>> syncRead(File file, Integer sheetNo, Integer headRowNum) {
        return EasyExcelFactory.read(file).sheet(sheetNo).headRowNumber(headRowNum).doReadSync();
    }

    /**
     * 同步无模型读(指定sheet和表头占的行数)
     *
     * @param filePath
     * @param sheetNo    sheet页号,从0开始
     * @param headRowNum 表头占的行数,从0开始(如果要连表头一起读出来则传0)
     * @return List>
     */
    public static List<Map<Integer, String>> syncRead(String filePath, Integer sheetNo, Integer headRowNum) {
        return EasyExcelFactory.read(filePath).sheet(sheetNo).headRowNumber(headRowNum).doReadSync();
    }

    /**
     * 同步按模型读(默认读取sheet0,从第2行开始读)
     *
     * @param filePath
     * @param clazz    模型的类类型(excel数据会按该类型转换成对象)
     * @return
     */
    public static List<T> syncReadModel(String filePath, Class clazz) {
        return EasyExcelFactory.read(filePath).sheet().head(clazz).doReadSync();
    }

    /**
     * 同步按模型读(默认表头占一行,从第2行开始读)
     *
     * @param filePath
     * @param clazz    模型的类类型(excel数据会按该类型转换成对象)
     * @param sheetNo  sheet页号,从0开始
     * @return
     */
    public static List<T> syncReadModel(String filePath, Class clazz, Integer sheetNo) {
        return EasyExcelFactory.read(filePath).sheet(sheetNo).head(clazz).doReadSync();
    }

    /**
     * 同步按模型读(指定sheet和表头占的行数)
     *
     * @param inputStream
     * @param clazz       模型的类类型(excel数据会按该类型转换成对象)
     * @param sheetNo     sheet页号,从0开始
     * @param headRowNum  表头占的行数,从0开始(如果要连表头一起读出来则传0)
     * @return
     */
    public static List<T> syncReadModel(InputStream inputStream, Class clazz, Integer sheetNo, Integer headRowNum) {
        return EasyExcelFactory.read(inputStream).sheet(sheetNo).headRowNumber(headRowNum).head(clazz).doReadSync();
    }

    /**
     * 同步按模型读(指定sheet和表头占的行数)
     *
     * @param file
     * @param clazz      模型的类类型(excel数据会按该类型转换成对象)
     * @param sheetNo    sheet页号,从0开始
     * @param headRowNum 表头占的行数,从0开始(如果要连表头一起读出来则传0)
     * @return
     */
    public static List<T> syncReadModel(File file, Class clazz, Integer sheetNo, Integer headRowNum) {
        return EasyExcelFactory.read(file).sheet(sheetNo).headRowNumber(headRowNum).head(clazz).doReadSync();
    }

    /**
     * 同步按模型读(指定sheet和表头占的行数)
     *
     * @param filePath
     * @param clazz      模型的类类型(excel数据会按该类型转换成对象)
     * @param sheetNo    sheet页号,从0开始
     * @param headRowNum 表头占的行数,从0开始(如果要连表头一起读出来则传0)
     * @return
     */
    public static List<T> syncReadModel(String filePath, Class clazz, Integer sheetNo, Integer headRowNum) {
        return EasyExcelFactory.read(filePath).sheet(sheetNo).headRowNumber(headRowNum).head(clazz).doReadSync();
    }

    /**
     * 异步无模型读(默认读取sheet0,从第2行开始读)
     *
     * @param excelListener 监听器,在监听器中可以处理行数据LinkedHashMap,表头数据,异常处理等
     * @param filePath      表头占的行数,从0开始(如果要连表头一起读出来则传0)
     * @return
     */
    public static void asyncRead(String filePath, AnalysisEventListener<T> excelListener) {
        EasyExcelFactory.read(filePath, excelListener).sheet().doRead();
    }

    /**
     * 异步无模型读(默认表头占一行,从第2行开始读)
     *
     * @param filePath      表头占的行数,从0开始(如果要连表头一起读出来则传0)
     * @param excelListener 监听器,在监听器中可以处理行数据LinkedHashMap,表头数据,异常处理等
     * @param sheetNo       sheet页号,从0开始
     * @return
     */
    public static void asyncRead(String filePath, AnalysisEventListener<T> excelListener, Integer sheetNo) {
        EasyExcelFactory.read(filePath, excelListener).sheet(sheetNo).doRead();
    }

    /**
     * 异步无模型读(指定sheet和表头占的行数)
     *
     * @param inputStream
     * @param excelListener 监听器,在监听器中可以处理行数据LinkedHashMap,表头数据,异常处理等
     * @param sheetNo       sheet页号,从0开始
     * @return
     */
    public static void asyncRead(InputStream inputStream, AnalysisEventListener<T> excelListener, Integer sheetNo, Integer headRowNum) {
        EasyExcelFactory.read(inputStream, excelListener).sheet(sheetNo).headRowNumber(headRowNum).doRead();

    }

    /**
     * 异步无模型读(指定sheet和表头占的行数)
     *
     * @param file
     * @param excelListener 监听器,在监听器中可以处理行数据LinkedHashMap,表头数据,异常处理等
     * @param sheetNo       sheet页号,从0开始
     * @param headRowNum    表头占的行数,从0开始(如果要连表头一起读出来则传0)
     * @return
     */
    public static void asyncRead(File file, AnalysisEventListener<T> excelListener, Integer sheetNo, Integer headRowNum) {
        EasyExcelFactory.read(file, excelListener).sheet(sheetNo).headRowNumber(headRowNum).doRead();
    }

    /**
     * 异步无模型读(指定sheet和表头占的行数)
     *
     * @param filePath
     * @param excelListener 监听器,在监听器中可以处理行数据LinkedHashMap,表头数据,异常处理等
     * @param sheetNo       sheet页号,从0开始
     * @param headRowNum    表头占的行数,从0开始(如果要连表头一起读出来则传0)
     * @return
     */
    public static void asyncRead(String filePath, AnalysisEventListener<T> excelListener, Integer sheetNo, Integer headRowNum) {
        EasyExcelFactory.read(filePath, excelListener).sheet(sheetNo).headRowNumber(headRowNum).doRead();
    }

    /**
     * 异步按模型读取(默认读取sheet0,从第2行开始读)
     *
     * @param filePath
     * @param excelListener 监听器,在监听器中可以处理行数据LinkedHashMap,表头数据,异常处理等
     * @param clazz         模型的类类型(excel数据会按该类型转换成对象)
     */
    public static void asyncReadModel(String filePath, AnalysisEventListener<T> excelListener, Class clazz) {
        EasyExcelFactory.read(filePath, clazz, excelListener).sheet().doRead();
    }

    /**
     * 异步按模型读取(默认表头占一行,从第2行开始读)
     *
     * @param filePath
     * @param excelListener 监听器,在监听器中可以处理行数据LinkedHashMap,表头数据,异常处理等
     * @param clazz         模型的类类型(excel数据会按该类型转换成对象)
     * @param sheetNo       sheet页号,从0开始
     */
    public static void asyncReadModel(String filePath, AnalysisEventListener<T> excelListener, Class clazz, Integer sheetNo) {
        EasyExcelFactory.read(filePath, clazz, excelListener).sheet(sheetNo).doRead();
    }

    /**
     * 异步按模型读取
     *
     * @param inputStream
     * @param excelListener 监听器,在监听器中可以处理行数据LinkedHashMap,表头数据,异常处理等
     * @param clazz         模型的类类型(excel数据会按该类型转换成对象)
     * @param sheetNo       sheet页号,从0开始
     * @param headRowNum    表头占的行数,从0开始(如果要连表头一起读出来则传0)
     */
    public static void asyncReadModel(InputStream inputStream, AnalysisEventListener<T> excelListener, Class clazz, Integer sheetNo, Integer headRowNum) {
        EasyExcelFactory.read(inputStream, clazz, excelListener).sheet(sheetNo).headRowNumber(headRowNum).doRead();
    }

    /**
     * 异步按模型读取
     *
     * @param file
     * @param excelListener 监听器,在监听器中可以处理行数据LinkedHashMap,表头数据,异常处理等
     * @param clazz         模型的类类型(excel数据会按该类型转换成对象)
     * @param sheetNo       sheet页号,从0开始
     * @param headRowNum    表头占的行数,从0开始(如果要连表头一起读出来则传0)
     */
    public static void asyncReadModel(File file, AnalysisEventListener<T> excelListener, Class clazz, Integer sheetNo, Integer headRowNum) {
        EasyExcelFactory.read(file, clazz, excelListener).sheet(sheetNo).headRowNumber(headRowNum).doRead();
    }

    /**
     * 异步按模型读取
     *
     * @param filePath
     * @param excelListener 监听器,在监听器中可以处理行数据LinkedHashMap,表头数据,异常处理等
     * @param clazz         模型的类类型(excel数据会按该类型转换成对象)
     * @param sheetNo       sheet页号,从0开始
     * @param headRowNum    表头占的行数,从0开始(如果要连表头一起读出来则传0)
     */
    public static void asyncReadModel(String filePath, AnalysisEventListener<T> excelListener, Class clazz, Integer sheetNo, Integer headRowNum) {
        EasyExcelFactory.read(filePath, clazz, excelListener).sheet(sheetNo).headRowNumber(headRowNum).doRead();
    }

    /**
     * 无模板写文件
     *
     * @param filePath
     * @param head     表头数据
     * @param data     表内容数据
     */
    public static void write(String filePath, List<List<String>> head, List<List<Object>> data) {
        EasyExcel.write(filePath).head(head).sheet().doWrite(data);
    }

    /**
     * 无模板写文件
     *
     * @param filePath
     * @param head      表头数据
     * @param data      表内容数据
     * @param sheetNo   sheet页号,从0开始
     * @param sheetName sheet名称
     */
    public static void write(String filePath, List<List<String>> head, List<List<Object>> data, Integer sheetNo, String sheetName) {
        EasyExcel.write(filePath).head(head).sheet(sheetNo, sheetName).doWrite(data);
    }

    /**
     * 根据excel模板文件写入文件
     *
     * @param filePath
     * @param templateFileName
     * @param headClazz
     * @param data
     */
    public static void writeTemplate(String filePath, String templateFileName, Class headClazz, List data) {
        EasyExcel.write(filePath, headClazz).withTemplate(templateFileName).sheet().doWrite(data);
    }

    /**
     * 根据excel模板文件写入文件
     *
     * @param filePath
     * @param templateFileName
     * @param data
     */
    public static void writeTemplate(String filePath, String templateFileName, List data) {
        EasyExcel.write(filePath).withTemplate(templateFileName).sheet().doWrite(data);
    }

    /**
     * 按模板写文件
     *
     * @param filePath
     * @param headClazz 表头模板
     * @param data      数据
     */
    public static void write(String filePath, Class headClazz, List data) {
        EasyExcel.write(filePath, headClazz).sheet().doWrite(data);
    }

    /**
     * 按模板写文件
     *
     * @param filePath
     * @param headClazz 表头模板
     * @param data      数据
     * @param sheetNo   sheet页号,从0开始
     * @param sheetName sheet名称
     */
    public static void write(String filePath, Class headClazz, List data, Integer sheetNo, String sheetName) {
        EasyExcel.write(filePath, headClazz).sheet(sheetNo, sheetName).doWrite(data);
    }

    /**
     * 按模板写文件
     *
     * @param filePath
     * @param headClazz    表头模板
     * @param data         数据
     * @param writeHandler 自定义的处理器,比如设置table样式,设置超链接、单元格下拉框等等功能都可以通过这个实现(需要注册多个则自己通过链式去调用)
     * @param sheetNo      sheet页号,从0开始
     * @param sheetName    sheet名称
     */
    public static void write(String filePath, Class headClazz, List data, WriteHandler writeHandler, Integer sheetNo, String sheetName) {
        EasyExcel.write(filePath, headClazz).registerWriteHandler(writeHandler).sheet(sheetNo, sheetName).doWrite(data);
    }

    /**
     * 按模板写文件(包含某些字段)
     *
     * @param filePath
     * @param headClazz   表头模板
     * @param data        数据
     * @param includeCols 过滤包含的字段,根据字段名称过滤
     * @param sheetNo     sheet页号,从0开始
     * @param sheetName   sheet名称
     */
    public static void writeInclude(String filePath, Class headClazz, List data, Set<String> includeCols, Integer sheetNo, String sheetName) {
        EasyExcel.write(filePath, headClazz).includeColumnFiledNames(includeCols).sheet(sheetNo, sheetName).doWrite(data);
    }

    /**
     * 按模板写文件(排除某些字段)
     *
     * @param filePath
     * @param headClazz   表头模板
     * @param data        数据
     * @param excludeCols 过滤排除的字段,根据字段名称过滤
     * @param sheetNo     sheet页号,从0开始
     * @param sheetName   sheet名称
     */
    public static void writeExclude(String filePath, Class headClazz, List data, Set<String> excludeCols, Integer sheetNo, String sheetName) {
        EasyExcel.write(filePath, headClazz).excludeColumnFiledNames(excludeCols).sheet(sheetNo, sheetName).doWrite(data);
    }

    /**
     * 多个sheet页的数据链式写入
     * ExcelUtil.writeWithSheets(outputStream)
     * .writeModel(ExcelModel.class, excelModelList, "sheetName1")
     * .write(headData, data,"sheetName2")
     * .finish();
     *
     * @param outputStream
     * @return
     */
    public static EasyExcelWriterFactory writeWithSheets(OutputStream outputStream) {
        EasyExcelWriterFactory excelWriter = new EasyExcelWriterFactory(outputStream);
        return excelWriter;
    }

    /**
     * 多个sheet页的数据链式写入
     * ExcelUtil.writeWithSheets(file)
     * .writeModel(ExcelModel.class, excelModelList, "sheetName1")
     * .write(headData, data,"sheetName2")
     * .finish();
     *
     * @param file
     * @return
     */
    public static EasyExcelWriterFactory writeWithSheets(File file) {
        EasyExcelWriterFactory excelWriter = new EasyExcelWriterFactory(file);
        return excelWriter;
    }

    /**
     * 多个sheet页的数据链式写入
     * ExcelUtil.writeWithSheets(filePath)
     * .writeModel(ExcelModel.class, excelModelList, "sheetName1")
     * .write(headData, data,"sheetName2")
     * .finish();
     *
     * @param filePath
     * @return
     */
    public static EasyExcelWriterFactory writeWithSheets(String filePath) {
        EasyExcelWriterFactory excelWriter = new EasyExcelWriterFactory(filePath);
        return excelWriter;
    }

    /**
     * 多个sheet页的数据链式写入(失败了会返回一个有部分数据的Excel)
     * ExcelUtil.writeWithSheets(response, exportFileName)
     * .writeModel(ExcelModel.class, excelModelList, "sheetName1")
     * .write(headData, data,"sheetName2")
     * .finish();
     *
     * @param response
     * @param exportFileName      导出的文件名称
     * @param commentWriteHandler
     * @return
     */
    public static EasyExcelWriterFactory writeWithSheetsWeb(HttpServletResponse response, String exportFileName, CommentWriteHandler commentWriteHandler) throws IOException {
//        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
        response.setContentType("application/vnd.ms-excel;charset=gb2312");
        response.setCharacterEncoding("utf-8");
        // 这里URLEncoder.encode可以防止中文乱码
        String fileName = URLEncoder.encode(exportFileName, "UTF-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + URLDecoder.decode(fileName, "UTF-8") + ".xlsx");
        EasyExcelWriterFactory excelWriter = new EasyExcelWriterFactory(response.getOutputStream(), commentWriteHandler);
        return excelWriter;
    }

    public static EasyExcelWriterFactory writeWithSheetsWeb(HttpServletResponse response, String exportFileName) throws IOException {
//        response.setContentType("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet;charset=utf-8");
        response.setContentType("application/vnd.ms-excel;charset=gb2312");
        response.setCharacterEncoding("utf-8");
        // 这里URLEncoder.encode可以防止中文乱码
        String fileName = URLEncoder.encode(exportFileName, "UTF-8");
        response.setHeader("Content-Disposition", "attachment;filename=" + URLDecoder.decode(fileName, "UTF-8") + ".xlsx");
        EasyExcelWriterFactory excelWriter = new EasyExcelWriterFactory(response.getOutputStream());
        return excelWriter;
    }
}


自定义一个easyexcel的工厂类


import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.ExcelWriter;
import com.alibaba.excel.write.metadata.WriteSheet;

import java.io.File;
import java.io.OutputStream;
import java.util.List;

/**
 * @ProjectName: knowlogy
 * @Package: know.utils.report
 * @ClassName: EasyExcelWriterFactory
 * @Author: 韩惠德
 * @Description: 自定义easyexcel工厂类
 * @Date: 2020/4/24 17:25
 * @Version: 1.0
 */
public class EasyExcelWriterFactory {
    private int sheetNo = 0;
    private ExcelWriter excelWriter = null;

    public EasyExcelWriterFactory(OutputStream outputStream, CommentWriteHandler commentWriteHandler) {
        excelWriter = EasyExcel.write(outputStream).inMemory(true).registerWriteHandler(commentWriteHandler).build();
    }
    public EasyExcelWriterFactory(OutputStream outputStream) {
        excelWriter = EasyExcel.write(outputStream).build();
    }

    public EasyExcelWriterFactory(File file) {
        excelWriter = EasyExcel.write(file).build();
    }

    public EasyExcelWriterFactory(String filePath) {
        excelWriter = EasyExcel.write(filePath).build();
    }

    /**
     * 链式模板表头写入
     *
     * @param headClazz 表头格式
     * @param data      数据 List 或者List>
     * @return
     */
    public EasyExcelWriterFactory writeModel(Class headClazz, List data, String sheetName) {
        WriteSheet vrdhi = EasyExcel.writerSheet(this.sheetNo++, sheetName).head(headClazz).build();
        excelWriter.write(data, vrdhi);
        return this;
    }

    /**
     * 链式自定义表头写入
     *
     * @param head
     * @param data      数据 List 或者List>
     * @param sheetName
     * @return
     */
    public EasyExcelWriterFactory write(List<List<String>> head, List data, String sheetName) {
        excelWriter.write(data, EasyExcel.writerSheet(this.sheetNo++, sheetName).head(head).build());
        return this;
    }

    public void finish() {
        excelWriter.finish();
    }

}

添加一个监听

import com.alibaba.excel.context.AnalysisContext;
import com.alibaba.excel.event.AnalysisEventListener;
import com.alibaba.excel.exception.ExcelDataConvertException;
import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import lombok.extern.slf4j.Slf4j;

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

/**
 * @ProjectName: knowlogy
 * @Package: know.utils.report
 * @ClassName: DefaultExcelListener
 * @Author: 韩惠德
 * @Description: 默认按模型读取监听器
 * @Date: 2020/4/24 17:26
 * @Version: 1.0
 */
@Slf4j
public class DefaultExcelListener<T> extends AnalysisEventListener<T> {
    private final List<T> rows = new ArrayList();
    /**
     * 每隔5条存储数据库,实际使用中可以3000条,然后清理list ,方便内存回收
     */
    private static final int BATCH_COUNT = 2000;

    @Override
    public void invokeHeadMap(Map<Integer, String> headMap, AnalysisContext context) {
        log.info("解析到一条头数据:{}", JSON.toJSONString(headMap));
    }

    @Override
    public void invoke(T object, AnalysisContext context) {
        //获取Person的Class对象
        log.info(JSONObject.toJSONString(object));
        rows.add(object);
        // 实际数据量比较大时,rows里的数据可以存到一定量之后进行批量处理(比如存到数据库),
        // 然后清空列表,以防止内存占用过多造成OOM
    }

    @Override
    public void doAfterAllAnalysed(AnalysisContext analysisContext) {
        log.info("read {} rows", rows.size());
    }

    /**
     * 在转换异常 获取其他异常下会调用本接口。抛出异常则停止读取。如果这里不抛出异常则 继续读取下一行。
     *
     * @param exception
     * @param context
     * @throws Exception
     */
    @Override
    public void onException(Exception exception, AnalysisContext context) {
        log.error("解析失败,但是继续解析下一行:{}", exception.getMessage());
        if (exception instanceof ExcelDataConvertException) {
            ExcelDataConvertException excelDataConvertException = (ExcelDataConvertException) exception;
            log.error("第{}行,第{}列解析异常,数据为:{}", excelDataConvertException.getRowIndex(), excelDataConvertException.getColumnIndex(), excelDataConvertException.getCellData());
            throw excelDataConvertException;
        }
    }

    public List<T> getRows() {
        return rows;
    }
}

在实际应用中有时会,增加批注 所以需要创建一个批注处理程序

import com.alibaba.excel.write.handler.AbstractRowWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import com.mysql.jdbc.StringUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFRichTextString;
import org.springframework.stereotype.Component;

import java.util.Iterator;
import java.util.Map;

@Component
@Slf4j
public class CommentWriteHandler extends AbstractRowWriteHandler {
    private final Map<String, String> map;

    public CommentWriteHandler(Map<String, String> map) {
        super();
        this.map = map;
    }

    @Override
    public void afterRowDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row,
                                Integer relativeRowIndex, Boolean isHead) {
        //如果false 就读取行数据.
        if (isHead) {
            Sheet sheet = writeSheetHolder.getSheet();
            Iterator<Cell> it = row.cellIterator();
            Integer i = 0;
            while (it.hasNext()) {
                Cell cell = it.next();
                if (!StringUtils.isEmptyOrWhitespaceOnly(map.get(cell.toString()))) {
                    setPostil(sheet, 0, i, cell.toString() + "  " + map.get(cell.toString()));
                }
                i++;
            }
        }
    }

    private void setPostil(Sheet sheet, Integer relativeRowIndex, Integer i, String msg) {
        Drawing<?> drawingPatriarch = sheet.createDrawingPatriarch();
        // 在第一行 第二列创建一个批注
        Comment comment = drawingPatriarch.createCellComment(new XSSFClientAnchor(0, 0, 0, 0, (short) 4, i + 1, (short) 5, i + 5));
        // 输入批注信息
        comment.setString(new XSSFRichTextString(msg));
        // 将批注添加到单元格对象中 对空处理的话是需要创建的 createCell
        sheet.getRow(relativeRowIndex).getCell(i).setCellComment(comment);
    }
}

导入导出数据

//导出excel
 EasyExcelWriterFactory writer = EasyExcelUtil.writeWithSheetsWeb(response, 文件名称);
        writer.writeModel(PackageWeightRatio.class, list, sheet页名称);
        writer.finish();
//导入数据
InputStream is = readingExcel("文件名称.xlsx");
        ExcelReader excelReader = EasyExcel.read(is).build();
        // 这里为了简单 所以注册了 同样的head 和Listener 自己使用功能必须不同的Listener
        DefaultExcelListener listenerNodes = new DefaultExcelListener();
        ReadSheet orderForm = EasyExcel.readSheet("sheet页名称").head(类名.class).registerReadListener(listenerNodes).build();
        excelReader.read(orderForm);
        List<类名> list = listenerNodes.getRows();

到此java excel的导入导出功能就完了

你可能感兴趣的:(java,easyexcel,工具类,批注,导入,导出)