springboot中Excel文件导出_springboot excel导出

一、添加依赖

            <!-- excel工具 -->
            <dependency>
                <groupId>org.apache.poi</groupId>
                <artifactId>poi-ooxml</artifactId>
                <version>${poi.version}</version>
            </dependency>
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二、导出数据实体类字段加注解

package com.ruoyi.system.domain;

import java.util.Date;
import com.fasterxml.jackson.annotation.JsonFormat;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import com.ruoyi.common.annotation.Excel;
import com.ruoyi.common.core.domain.BaseEntity;

/**
 * 对象 sys_product
 * 
 * @date 2021-12-29
 */
public class SysProduct extends BaseEntity
{
    private static final long serialVersionUID = 1L;

    /** $column.columnComment */
    private String id;

    /** 名称 */
    @Excel(name = "名称")
    private String productname;

    /** 规格 */
    @Excel(name = "规格")
    private String specifications;

    /** 原价 */
    @Excel(name = "原价")
    private Long originalprice;

    /** 现价 */
    @Excel(name = "现价")
    private Long price;

    /** 库存 */
    @Excel(name = "库存")
    private String stock;

    /** 创建日期 */
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    @Excel(name = "创建日期", width = 30, dateFormat = "yyyy-MM-dd HH:mm:ss")
    private Date createtime;

    /** 更新日期 */
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    @Excel(name = "更新日期", width = 30, dateFormat = "yyyy-MM-dd HH:mm:ss")
    private Date updatetime;

    /** 生产日期 */
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    @Excel(name = "生产日期", width = 30, dateFormat = "yyyy-MM-dd HH:mm:ss")
    private Date dateofmanufacture;

    /** 保质期 */
    @Excel(name = "保质期")
    private String qualityguaranteeperiod;

    /** 图片路径 */
    @Excel(name = "图片路径")
    private String imageurl;

    public Date getCreatetime() {
        return createtime;
    }

    public void setCreatetime(Date createtime) {
        this.createtime = createtime;
    }

    public Date getUpdatetime() {
        return updatetime;
    }

    public void setUpdatetime(Date updatetime) {
        this.updatetime = updatetime;
    }

    public void setId(String id)
    {
        this.id = id;
    }

    public String getId() 
    {
        return id;
    }
    public void setProductname(String productname) 
    {
        this.productname = productname;
    }

    public String getProductname() 
    {
        return productname;
    }
    public void setSpecifications(String specifications) 
    {
        this.specifications = specifications;
    }

    public String getSpecifications() 
    {
        return specifications;
    }
    public void setOriginalprice(Long originalprice) 
    {
        this.originalprice = originalprice;
    }

    public Long getOriginalprice() 
    {
        return originalprice;
    }
    public void setPrice(Long price) 
    {
        this.price = price;
    }

    public Long getPrice() 
    {
        return price;
    }
    public void setStock(String stock) 
    {
        this.stock = stock;
    }

    public String getStock() 
    {
        return stock;
    }
    public void setDateofmanufacture(Date dateofmanufacture) 
    {
        this.dateofmanufacture = dateofmanufacture;
    }

    public Date getDateofmanufacture() 
    {
        return dateofmanufacture;
    }
    public void setQualityguaranteeperiod(String qualityguaranteeperiod) 
    {
        this.qualityguaranteeperiod = qualityguaranteeperiod;
    }

    public String getQualityguaranteeperiod() 
    {
        return qualityguaranteeperiod;
    }
    public void setImageurl(String imageurl) 
    {
        this.imageurl = imageurl;
    }

    public String getImageurl() 
    {
        return imageurl;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this,ToStringStyle.MULTI_LINE_STYLE)
            .append("id", getId())
            .append("productname", getProductname())
            .append("specifications", getSpecifications())
            .append("originalprice", getOriginalprice())
            .append("price", getPrice())
            .append("stock", getStock())
            .append("dateofmanufacture", getDateofmanufacture())
            .append("qualityguaranteeperiod", getQualityguaranteeperiod())
            .append("imageurl", getImageurl())
            .append("createtime", getCreatetime())
            .append("updatetime", getUpdatetime())
            .toString();
    }
}
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三、添加工具类 ExcelUtil.java

package com.ruoyi.common.utils.poi;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.math.BigDecimal;
import java.text.DecimalFormat;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Date;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import java.util.stream.Collectors;
import javax.servlet.http.HttpServletResponse;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFPicture;
import org.apache.poi.hssf.usermodel.HSSFPictureData;
import org.apache.poi.hssf.usermodel.HSSFShape;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.ooxml.POIXMLDocumentPart;
import org.apache.poi.ss.usermodel.BorderStyle;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;
import org.apache.poi.ss.usermodel.CellType;
import org.apache.poi.ss.usermodel.ClientAnchor;
import org.apache.poi.ss.usermodel.DataValidation;
import org.apache.poi.ss.usermodel.DataValidationConstraint;
import org.apache.poi.ss.usermodel.DataValidationHelper;
import org.apache.poi.ss.usermodel.DateUtil;
import org.apache.poi.ss.usermodel.Drawing;
import org.apache.poi.ss.usermodel.FillPatternType;
import org.apache.poi.ss.usermodel.Font;
import org.apache.poi.ss.usermodel.HorizontalAlignment;
import org.apache.poi.ss.usermodel.IndexedColors;
import org.apache.poi.ss.usermodel.PictureData;
import org.apache.poi.ss.usermodel.Row;
import org.apache.poi.ss.usermodel.Sheet;
import org.apache.poi.ss.usermodel.VerticalAlignment;
import org.apache.poi.ss.usermodel.Workbook;
import org.apache.poi.ss.usermodel.WorkbookFactory;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.CellRangeAddressList;
import org.apache.poi.util.IOUtils;
import org.apache.poi.xssf.streaming.SXSSFWorkbook;
import org.apache.poi.xssf.usermodel.XSSFClientAnchor;
import org.apache.poi.xssf.usermodel.XSSFDataValidation;
import org.apache.poi.xssf.usermodel.XSSFDrawing;
import org.apache.poi.xssf.usermodel.XSSFPicture;
import org.apache.poi.xssf.usermodel.XSSFShape;
import org.apache.poi.xssf.usermodel.XSSFSheet;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.openxmlformats.schemas.drawingml.x2006.spreadsheetDrawing.CTMarker;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.ruoyi.common.annotation.Excel;
import com.ruoyi.common.annotation.Excel.ColumnType;
import com.ruoyi.common.annotation.Excel.Type;
import com.ruoyi.common.annotation.Excels;
import com.ruoyi.common.config.RuoYiConfig;
import com.ruoyi.common.core.domain.AjaxResult;
import com.ruoyi.common.core.text.Convert;
import com.ruoyi.common.exception.UtilException;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.DictUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.file.FileTypeUtils;
import com.ruoyi.common.utils.file.FileUtils;
import com.ruoyi.common.utils.file.ImageUtils;
import com.ruoyi.common.utils.reflect.ReflectUtils;

/**
 * Excel相关处理
 * 
 */
public class ExcelUtil<T>
{
    private static final Logger log = LoggerFactory.getLogger(ExcelUtil.class);

    /**
     * Excel sheet最大行数，默认65536
     */
    public static final int sheetSize = 65536;

    /**
     * 工作表名称
     */
    private String sheetName;

    /**
     * 导出类型（EXPORT:导出数据；IMPORT：导入模板）
     */
    private Type type;

    /**
     * 工作薄对象
     */
    private Workbook wb;

    /**
     * 工作表对象
     */
    private Sheet sheet;

    /**
     * 样式列表
     */
    private Map<String, CellStyle> styles;

    /**
     * 导入导出数据列表
     */
    private List<T> list;

    /**
     * 注解列表
     */
    private List<Object[]> fields;

    /**
     * 当前行号
     */
    private int rownum;
    
    /**
     * 标题
     */
    private String title;

    /**
     * 最大高度
     */
    private short maxHeight;

    /**
     * 统计列表
     */
    private Map<Integer, Double> statistics = new HashMap<Integer, Double>();

    /**
     * 数字格式
     */
    private static final DecimalFormat DOUBLE_FORMAT = new DecimalFormat("######0.00");

    /**
     * 实体对象
     */
    public Class<T> clazz;

    public ExcelUtil(Class<T> clazz)
    {
        this.clazz = clazz;
    }

    public void init(List<T> list, String sheetName, String title, Type type)
    {
        if (list == null)
        {
            list = new ArrayList<T>();
        }
        this.list = list;
        this.sheetName = sheetName;
        this.type = type;
        this.title = title;
        createExcelField();
        createWorkbook();
        createTitle();
    }

    /**
     * 创建excel第一行标题
     */
    public void createTitle()
    {
        if (StringUtils.isNotEmpty(title))
        {
            Row titleRow = sheet.createRow(rownum == 0 ? rownum++ : 0);
            titleRow.setHeightInPoints(30);
            Cell titleCell = titleRow.createCell(0);
            titleCell.setCellStyle(styles.get("title"));
            titleCell.setCellValue(title);
            sheet.addMergedRegion(new CellRangeAddress(titleRow.getRowNum(), titleRow.getRowNum(), titleRow.getRowNum(),
                    this.fields.size() - 1));
        }
    }

    /**
     * 对excel表单默认第一个索引名转换成list
     * 
     * @param is 输入流
     * @return 转换后集合
     */
    public List<T> importExcel(InputStream is) throws Exception
    {
        return importExcel(is, 0);
    }

    /**
     * 对excel表单默认第一个索引名转换成list
     * 
     * @param is 输入流
     * @param titleNum 标题占用行数
     * @return 转换后集合
     */
    public List<T> importExcel(InputStream is, int titleNum) throws Exception
    {
        return importExcel(StringUtils.EMPTY, is, titleNum);
    }

    /**
     * 对excel表单指定表格索引名转换成list
     * 
     * @param sheetName 表格索引名
     * @param titleNum 标题占用行数
     * @param is 输入流
     * @return 转换后集合
     */
    public List<T> importExcel(String sheetName, InputStream is, int titleNum) throws Exception
    {
        this.type = Type.IMPORT;
        this.wb = WorkbookFactory.create(is);
        List<T> list = new ArrayList<T>();
        // 如果指定sheet名,则取指定sheet中的内容 否则默认指向第1个sheet
        Sheet sheet = StringUtils.isNotEmpty(sheetName) ? wb.getSheet(sheetName) : wb.getSheetAt(0);
        if (sheet == null)
        {
            throw new IOException("文件sheet不存在");
        }
        boolean isXSSFWorkbook = !(wb instanceof HSSFWorkbook);
        Map<String, PictureData> pictures;
        if (isXSSFWorkbook)
        {
            pictures = getSheetPictures07((XSSFSheet) sheet, (XSSFWorkbook) wb);
        }
        else
        {
            pictures = getSheetPictures03((HSSFSheet) sheet, (HSSFWorkbook) wb);
        }
        // 获取最后一个非空行的行下标，比如总行数为n，则返回的为n-1
        int rows = sheet.getLastRowNum();

        if (rows > 0)
        {
            // 定义一个map用于存放excel列的序号和field.
            Map<String, Integer> cellMap = new HashMap<String, Integer>();
            // 获取表头
            Row heard = sheet.getRow(titleNum);
            for (int i = 0; i < heard.getPhysicalNumberOfCells(); i++)
            {
                Cell cell = heard.getCell(i);
                if (StringUtils.isNotNull(cell))
                {
                    String value = this.getC
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