import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.net.ConnectException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLConnection;import com.alibaba.excel.converters.Converter;
import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.CellData;
import com.alibaba.excel.metadata.GlobalConfiguration;
import com.alibaba.excel.metadata.property.ExcelContentProperty;
import com.alibaba.excel.util.IoUtils;
import com.njyjz.common.util.Validater;public class MyStringImageConverter implements Converter<String>
{@Overridepublic Class supportJavaTypeKey(){return String.class;}@Overridepublic CellDataTypeEnum supportExcelTypeKey(){return CellDataTypeEnum.IMAGE;}@Overridepublic String convertToJavaData(CellData cellData, ExcelContentProperty contentProperty,GlobalConfiguration globalConfiguration){throw new UnsupportedOperationException("Cannot convert images to string");}// 图片失效处理@Overridepublic CellData convertToExcelData(String value, ExcelContentProperty contentProperty,GlobalConfiguration globalConfiguration)throws IOException{InputStream inputStream = null;try{if(Validater.isEmptyString(value)){return new CellData("图片路径为空");}URL urlValue = new URL(value);// 开启连接URLConnection uc = urlValue.openConnection();// 获取响应状态int statusCode = ((HttpURLConnection)uc).getResponseCode();switch (statusCode){case 200:inputStream = urlValue.openStream();break;default:return new CellData("无法加载图片");}byte[] bytes = IoUtils.toByteArray(inputStream);return new CellData(bytes);}catch (ConnectException exception){return new CellData("无法加载图片");}catch (FileNotFoundException fileNotFoundException){return new CellData("无法加载图片");}finally{if (inputStream != null){inputStream.close();}}}}

@ExcelProperty(value = "扫描图像", index = 0, converter = MyStringImageConverter.class)
private String fileUrl;