1.什么是easypoi？

Easypoi功能如同名字easy，主打的功能就是容易，让一个没见接触过poi的人员就可以方便的写出Excel导出，Excel模板导出，Excel导入，Word模板导出，通过简单的注解和模板语言(熟悉的表达式语法)，完成以前复杂的写法。

2.代码工程

实验目的：实现excel导入和导出

pom.xml

<?xml version="1.0" encoding="UTF-8"?><project xmlns="http://maven.apache.org/POM/4.0.0"         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">    <parent>        <artifactId>springboot-demo</artifactId>        <groupId>com.et</groupId>        <version>1.0-SNAPSHOT</version>    </parent>    <modelVersion>4.0.0</modelVersion>
    <artifactId>eaypoi</artifactId>
    <properties>        <maven.compiler.source>8</maven.compiler.source>        <maven.compiler.target>8</maven.compiler.target>    </properties>    <dependencies>
        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-web</artifactId>        </dependency>
        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-autoconfigure</artifactId>        </dependency>        <dependency>            <groupId>org.springframework.boot</groupId>            <artifactId>spring-boot-starter-test</artifactId>            <scope>test</scope>        </dependency>        <dependency>            <groupId>cn.afterturn</groupId>            <artifactId>easypoi-spring-boot-starter</artifactId>            <version>4.1.2</version>        </dependency>        <dependency>            <groupId>org.projectlombok</groupId>            <artifactId>lombok</artifactId>        </dependency>        <dependency>            <groupId>com.alibaba</groupId>            <artifactId>fastjson</artifactId>            <version>2.0.40</version>        </dependency>    </dependencies></project>

HelloWorldController.java

package com.et.easypoi.controller;
import com.alibaba.fastjson.JSONObject;import com.et.easypoi.Util.FileUtil;import com.et.easypoi.model.GoodType;import com.et.easypoi.model.Goods;import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import org.springframework.web.bind.annotation.RestController;
import javax.servlet.http.HttpServletResponse;import java.util.*;
@RestControllerpublic class HelloWorldController {    @RequestMapping("/hello")    public Map<String, Object> showHelloWorld(){        Map<String, Object> map = new HashMap<>();        map.put("msg", "HelloWorld");        return map;    }    @RequestMapping("/exportExcel")    public void export(HttpServletResponse response) throws Exception {        //mock datas        Goods goods1 = new Goods();        List<GoodType>  goodTypeList1 = new ArrayList<>();        GoodType goodType1  =  new GoodType();        goodType1.setTypeId("apple-1");        goodType1.setTypeName("apple-red");        goodTypeList1.add(goodType1);        GoodType goodType2  =  new GoodType();        goodType2.setTypeId("apple-2");        goodType2.setTypeName("apple-white");        goodTypeList1.add(goodType2);        goods1.setNo(110);        goods1.setName("apple");        goods1.setShelfLife(new Date());        goods1.setGoodTypes(goodTypeList1);

        Goods goods2 = new Goods();        List<GoodType>  goodTypeList2 = new ArrayList<>();        GoodType goodType21  =  new GoodType();        goodType21.setTypeId("wine-1");        goodType21.setTypeName("wine-red");        goodTypeList2.add(goodType21);        GoodType goodType22  =  new GoodType();        goodType22.setTypeId("wine-2");        goodType22.setTypeName("wine-white");        goodTypeList2.add(goodType22);        goods2.setNo(111);        goods2.setName("wine");        goods2.setShelfLife(new Date());        goods2.setGoodTypes(goodTypeList2);

        List<Goods> goodsList = new ArrayList<Goods>();        goodsList.add(goods1);        goodsList.add(goods2);

        for (Goods goods : goodsList) {            System.out.println(goods);        }        //export        FileUtil.exportExcel(goodsList, Goods.class,"product.xls",response);    }
    @RequestMapping("/importExcel")    public void importExcel() throws Exception {        //loal file        String filePath = "C:\\Users\\Dell\\Downloads\\product.xls";        //anaysis excel        List<Goods> goodsList = FileUtil.importExcel(filePath,0,1,Goods.class);        //also use MultipartFile,invoke FileUtil.importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass)        System.out.println("load data count【"+goodsList.size()+"】row");
        //TODO save datas        for (Goods goods:goodsList) {            JSONObject.toJSONString(goods);        }    }}

model

package com.et.easypoi.model;
import cn.afterturn.easypoi.excel.annotation.Excel;import cn.afterturn.easypoi.excel.annotation.ExcelCollection;import lombok.Data;
import java.io.Serializable;import java.util.Date;import java.util.List;
@Datapublic class Goods implements Serializable {


    @Excel(name = "NO",needMerge = true ,width = 20)    private Integer no;
    @Excel(name = "name",needMerge = true ,width = 20)    private String name;
    @Excel(name = "shelfLife",width = 20,needMerge = true ,exportFormat = "yyyy-MM-dd")    private Date shelfLife;
    @ExcelCollection(name = "goodTypes")    private List<GoodType> goodTypes;
}

package com.et.easypoi.model;
import cn.afterturn.easypoi.excel.annotation.Excel;import lombok.Data;
/** * @author liuhaihua * @version 1.0 * @ClassName GoodType * @Description todo * @date 2024年04月15日 11:02 */@Datapublic class GoodType {    @Excel(name = "typeId",  width = 20,height = 8)    private String typeId;    @Excel(name = "typeName",  width = 20,height = 8)    private String typeName;}

FileUtil

通用工具类，导出和导出封装

package com.et.easypoi.Util;
import cn.afterturn.easypoi.excel.ExcelExportUtil;import cn.afterturn.easypoi.excel.ExcelImportUtil;import cn.afterturn.easypoi.excel.entity.ExportParams;import cn.afterturn.easypoi.excel.entity.ImportParams;import cn.afterturn.easypoi.excel.entity.enmus.ExcelType;import com.et.easypoi.service.ExcelExportStyler;import org.apache.commons.lang3.StringUtils;import org.apache.poi.ss.usermodel.CellStyle;import org.apache.poi.ss.usermodel.FillPatternType;import org.apache.poi.ss.usermodel.IndexedColors;import org.apache.poi.ss.usermodel.Workbook;import org.springframework.web.multipart.MultipartFile;
import javax.servlet.ServletOutputStream;import javax.servlet.http.HttpServletResponse;import java.io.File;import java.io.IOException;import java.io.OutputStream;import java.net.URLEncoder;import java.util.List;import java.util.Map;import java.util.NoSuchElementException;
public class FileUtil {
    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass, String fileName, boolean isCreateHeader, HttpServletResponse response) throws Exception {        ExportParams exportParams = new ExportParams(title, sheetName);        exportParams.setCreateHeadRows(isCreateHeader);        defaultExport(list, pojoClass, fileName, response, exportParams);    }    public static void exportExcel(List<?> list, Class<?> pojoClass, String fileName,  HttpServletResponse response) throws Exception {        ExportParams exportParams = new ExportParams();        exportParams.setStyle(ExcelExportStyler.class); // set style        defaultExport(list, pojoClass, fileName, response, exportParams);    }    public static void exportExcel(List<?> list, String title, String sheetName, Class<?> pojoClass,String fileName, HttpServletResponse response) throws Exception {        defaultExport(list, pojoClass, fileName, response, new ExportParams(title, sheetName));    }    public static void exportExcel(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws Exception {        defaultExport(list, fileName, response);    }
    private static void defaultExport(List<?> list, Class<?> pojoClass, String fileName, HttpServletResponse response, ExportParams exportParams) throws Exception {        Workbook workbook = ExcelExportUtil.exportExcel(exportParams,pojoClass,list);        if (workbook != null);        downLoadExcel(fileName, response, workbook);    }
    private static void downLoadExcel(String fileName, HttpServletResponse response, Workbook workbook) throws Exception {        OutputStream outputStream=null;        try {            response.setCharacterEncoding("UTF-8");            response.setHeader("content-Type", "application/vnd.ms-excel");            response.setHeader("Content-Disposition",                    "attachment;filename=" + URLEncoder.encode(fileName, "UTF-8"));            outputStream = response.getOutputStream();
            workbook.write(outputStream);        } catch (IOException e) {            throw new Exception(e.getMessage());        }finally {            try {                outputStream.close();            } catch (IOException e) {                e.printStackTrace();            }        }    }    private static void defaultExport(List<Map<String, Object>> list, String fileName, HttpServletResponse response) throws Exception {        Workbook workbook = ExcelExportUtil.exportExcel(list, ExcelType.HSSF);        if (workbook != null);        downLoadExcel(fileName, response, workbook);    }
    public static <T> List<T> importExcel(String filePath,Integer titleRows,Integer headerRows, Class<T> pojoClass) throws Exception {        if (StringUtils.isBlank(filePath)){            return null;        }        ImportParams params = new ImportParams();        params.setTitleRows(titleRows);        params.setHeadRows(headerRows);        List<T> list = null;        try {            list = ExcelImportUtil.importExcel(new File(filePath), pojoClass, params);        }catch (NoSuchElementException e){            throw new Exception("template not null");        } catch (Exception e) {            e.printStackTrace();            throw new Exception(e.getMessage());        }        return list;    }    public static <T> List<T> importExcel(MultipartFile file, Integer titleRows, Integer headerRows, Class<T> pojoClass) throws Exception {        if (file == null){            return null;        }        ImportParams params = new ImportParams();        params.setTitleRows(titleRows);        params.setHeadRows(headerRows);        List<T> list = null;        try {            list = ExcelImportUtil.importExcel(file.getInputStream(), pojoClass, params);        }catch (NoSuchElementException e){            throw new Exception("excel file not null");        } catch (Exception e) {            throw new Exception(e.getMessage());        }        return list;    }}

ExcelExportStyler

设置表头，单元格样式

package com.et.easypoi.service;
import cn.afterturn.easypoi.excel.entity.params.ExcelExportEntity;import cn.afterturn.easypoi.excel.entity.params.ExcelForEachParams;import cn.afterturn.easypoi.excel.export.styler.IExcelExportStyler;import org.apache.poi.ss.usermodel.*;
public class ExcelExportStyler implements IExcelExportStyler {    private static final short STRING_FORMAT = (short) BuiltinFormats.getBuiltinFormat("TEXT");    private static final short FONT_SIZE_TEN = 10;    private static final short FONT_SIZE_ELEVEN = 11;    private static final short FONT_SIZE_TWELVE = 12;    /**     * header style     */    private CellStyle headerStyle;    /**     * title style     */    private CellStyle titleStyle;    /**     * cell style     */    private CellStyle styles;
    public ExcelExportStyler(Workbook workbook) {        this.init(workbook);    }
    /**     * init     *     * @param workbook     */    private void init(Workbook workbook) {        this.headerStyle = initHeaderStyle(workbook);        this.titleStyle = initTitleStyle(workbook);    }
    @Override    public CellStyle getHeaderStyle(short color) {        return headerStyle;    }

    @Override    public CellStyle getTitleStyle(short color) {        return titleStyle;    }

    @Override    public CellStyle getStyles(boolean parity, ExcelExportEntity entity) {        return styles;    }

    @Override    public CellStyle getStyles(Cell cell, int dataRow, ExcelExportEntity entity, Object obj, Object data) {        return getStyles(true, entity);    }
    @Override    public CellStyle getTemplateStyles(boolean isSingle, ExcelForEachParams excelForEachParams) {        return null;    }
    /**     * init --HeaderStyle     *     * @param workbook     * @return     */    private CellStyle initHeaderStyle(Workbook workbook) {        CellStyle style = getBaseCellStyle(workbook);        style.setFont(getFont(workbook, FONT_SIZE_TWELVE, true));        return style;    }
    /**     * init-TitleStyle     *     * @param workbook     * @return     */    private CellStyle initTitleStyle(Workbook workbook) {        CellStyle style = getBaseCellStyle(workbook);        style.setFont(getFont(workbook, FONT_SIZE_ELEVEN, false));        // ForegroundColor        style.setFillForegroundColor(IndexedColors.GREY_25_PERCENT.getIndex());        style.setFillPattern(FillPatternType.SOLID_FOREGROUND);        return style;    }
    /**     * BaseCellStyle     *     * @return     */    private CellStyle getBaseCellStyle(Workbook workbook) {        CellStyle style = workbook.createCellStyle();        style.setBorderBottom(BorderStyle.THIN);        style.setBorderLeft(BorderStyle.THIN);        style.setBorderTop(BorderStyle.THIN);        style.setBorderRight(BorderStyle.THIN);        style.setAlignment(HorizontalAlignment.CENTER);        style.setVerticalAlignment(VerticalAlignment.CENTER);        style.setWrapText(true);        return style;    }
    /**     * Font     *     * @param size     * @param isBold     * @return     */    private Font getFont(Workbook workbook, short size, boolean isBold) {        Font font = workbook.createFont();        font.setFontName("宋体");        font.setBold(isBold);        font.setFontHeightInPoints(size);        return font;    }}

package com.et.easypoi.service;
import cn.afterturn.easypoi.excel.entity.params.ExcelExportEntity;import org.apache.poi.ss.usermodel.CellStyle;
public interface IExcelExportStyler {    /**     * heder style     * @param headerColor     * @return     */    public CellStyle getHeaderStyle(short headerColor);    /**     * title style     * @param color     * @return     */    public CellStyle getTitleStyle(short color);    /**     * getstyle     * @param Parity     * @param entity     * @return     */    public CellStyle getStyles(boolean Parity, ExcelExportEntity entity);}

以上只是一些关键代码，所有代码请参见下面代码仓库

代码仓库

https://github.com/Harries/springboot-demo

3.测试

启动Spring Boot应用

导出

访问http://127.0.0.1:8088/importExcel

导入