前言

本文基于若依框架，实现excel中图片导出功能。

自定义导出Excel数据注解

public enum ColumnType{NUMERIC(0), STRING(1), IMAGE(2);private final int value;ColumnType(int value){this.value = value;}public int value(){return this.value;}}

 工具类中设置

/*** 设置单元格信息* * @param value 单元格值* @param attr 注解相关* @param cell 单元格信息*/public void setCellVo(Object value, Excel attr, Cell cell){if (Excel.ColumnType.STRING == attr.cellType()){String cellValue = Convert.toStr(value);// 对于任何以表达式触发字符 =-+@开头的单元格，直接使用tab字符作为前缀，防止CSV注入。if (StringUtils.startsWithAny(cellValue, FORMULA_STR)){cellValue = RegExUtils.replaceFirst(cellValue, FORMULA_REGEX_STR, "\t$0");}if (value instanceof Collection && StringUtils.equals("[]", cellValue)){cellValue = StringUtils.EMPTY;}cell.setCellValue(StringUtils.isNull(cellValue) ? attr.defaultValue() : cellValue + attr.suffix());}else if (Excel.ColumnType.NUMERIC == attr.cellType()){if (StringUtils.isNotNull(value)){cell.setCellValue(StringUtils.contains(Convert.toStr(value), ".") ? Convert.toDouble(value) : Convert.toInt(value));}}else if (Excel.ColumnType.IMAGE == attr.cellType()){ClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 0, (short) cell.getColumnIndex(), cell.getRow().getRowNum(), (short) (cell.getColumnIndex() + 1), cell.getRow().getRowNum() + 1);String imagePath = Convert.toStr(value);if (StringUtils.isNotEmpty(imagePath)){byte[] data = ImageUtils.getImage(imagePath);getDrawingPatriarch(cell.getSheet()).createPicture(anchor,cell.getSheet().getWorkbook().addPicture(data, getImageType(data)));}}}/*** 获取画布*/public static Drawing<?> getDrawingPatriarch(Sheet sheet){if (sheet.getDrawingPatriarch() == null){sheet.createDrawingPatriarch();}return sheet.getDrawingPatriarch();}/*** 获取图片类型,设置图片插入类型*/public int getImageType(byte[] value){String type = FileTypeUtils.getFileExtendName(value);if ("JPG".equalsIgnoreCase(type)){return Workbook.PICTURE_TYPE_JPEG;}else if ("PNG".equalsIgnoreCase(type)){return Workbook.PICTURE_TYPE_PNG;}return Workbook.PICTURE_TYPE_JPEG;}

图片处理工具类

使用字节流，对图片文件进行处理

import org.apache.poi.util.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;
import java.util.Arrays;/*** 图片处理工具类** */
public class ImageUtils {private static final Logger log = LoggerFactory.getLogger(ImageUtils.class);public static byte[] getImage(String imagePath) {InputStream is = getFile(imagePath);try {return IOUtils.toByteArray(is);} catch (Exception e) {log.error("图片加载异常 {}", e);return null;} finally {IOUtils.closeQuietly(is);}}public static InputStream getFile(String imagePath) {try {byte[] result = readFile(imagePath);result = Arrays.copyOf(result, result.length);return new ByteArrayInputStream(result);} catch (Exception e) {log.error("获取图片异常 {}", e);}return null;}/*** 读取文件为字节数据** @param url 地址* @return 字节数据*/public static byte[] readFile(String url) {InputStream in = null;try {// 网络地址URL urlObj = new URL(url);URLConnection urlConnection = urlObj.openConnection();urlConnection.setConnectTimeout(30 * 1000);urlConnection.setReadTimeout(60 * 1000);urlConnection.setDoInput(true);in = urlConnection.getInputStream();return IOUtils.toByteArray(in);} catch (Exception e) {log.error("访问文件异常 {}", e);return null;} finally {IOUtils.closeQuietly(in);}}
}

使用

@Excel(name = "图片", cellType = Excel.ColumnType.IMAGE)
private String pictureUrls;

结果