既然要修改源码部分bug问题，那么就把使用一并讲了吧：
1.首先，导出图片对象参数设置如下：
/**
* 证件URL
*/
@Excel(name = "证件",orderNum = "3",type = 2,width = 100D,height = 100D)
private String imgPath;
设置type = 2表示导出图片
2.修改源码部分：
package com.lbd99.scm.credit.service;
import cn.afterturn.easypoi.cache.manager.FileLoaderImpl;
import cn.afterturn.easypoi.cache.manager.IFileLoader;
import cn.afterturn.easypoi.util.PoiPublicUtil;
import org.apache.poi.util.IOUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.*;
import java.net.URL;
import java.net.URLConnection;
/**
* easyPoi源码方法重写,源码出现bug,此处重写方法修复bug,使用时重新引入
*
* 针对图片导出功能
*
* @author Tom
* @date 2020-01-08
*/
public class FileLoaderImplOnce implements IFileLoader {
private static final Logger LOGGER = LoggerFactory.getLogger(FileLoaderImpl.class);
@Override
public byte[] getFile(String url) {
InputStream fileis = null;
ByteArrayOutputStream baos = null;
try {
//判断是否是网络地址
if (url.startsWith("http")) {
URL urlObj = new URL(url);
URLConnection urlConnection = urlObj.openConnection();
urlConnection.setConnectTimeout(3 * 1000);
urlConnection.setReadTimeout(60 * 1000);
urlConnection.setDoInput(true);
urlConnection.setRequestProperty("Accept-Charset", "UTF-8");
fileis = urlConnection.getInputStream();
} else {
//先用绝对路径查询,再查询相对路径
try {
fileis = new FileInputStream(url);
} catch (FileNotFoundException e) {
//获取项目文件
fileis = FileLoaderImpl.class.getClassLoader().getResourceAsStream(url);
if (fileis == null) {
//最后再拿相对文件路径
String path = PoiPublicUtil.getWebRootPath(url);
fileis = new FileInputStream(path);
}
}
}
baos = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
int len;
while ((len = fileis.read(buffer)) > -1) {
baos.write(buffer, 0, len);
}
baos.flush();
return baos.toByteArray();
} catch (IOException e) {
LOGGER.error(e.getMessage(), e);
} finally {
IOUtils.closeQuietly(fileis);
IOUtils.closeQuietly(baos);
}
LOGGER.error(fileis + "这个路径文件没有找到,请查询");
return null;
}
}
此处源码主要修改http方式的链接时间，项目实测，60毫秒对于大文件无法获取。
源码LoadingCache方法重写：
package com.lbd99.scm.credit.service;
import java.awt.image.BufferedImage;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.util.concurrent.TimeUnit;
import javax.imageio.ImageIO;
import org.apache.poi.util.IOUtils;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;
import cn.afterturn.easypoi.cache.manager.POICacheManager;
/**
* easyPoi方法重写,源码有bug,此方法重写后进行调用
*
* 针对图片导出功能
*
* @author Tom
* @date 2020-01-08
*/
public class ImageLoadCache {
public static LoadingCache<String, byte[]> loadingCache;
static {
loadingCache = CacheBuilder.newBuilder().expireAfterWrite(1, TimeUnit.DAYS)
.maximumSize(2000).build(new CacheLoader<String, byte[]>() {
@Override
public byte[] load(String imagePath) throws Exception {
InputStream is = POICacheManager.getFile(imagePath);
BufferedImage bufferImg = ImageIO.read(is);
ByteArrayOutputStream byteArrayOut = new ByteArrayOutputStream();
try {
ImageIO.write(bufferImg,
imagePath.substring(imagePath.lastIndexOf(".") + 1, imagePath.length()),
byteArrayOut);
return byteArrayOut.toByteArray();
} finally {
IOUtils.closeQuietly(is);
IOUtils.closeQuietly(byteArrayOut);
}
}
});
}
}
此处主要解决,图片地址中存在".“的情况，所以从后开始取”."的部分
3.在设置导出参数之前，添加如下方法：
POICacheManager.setFileLoderOnce(new FileLoaderImplOnce());
ImageCache.setLoadingCache(ImageLoadCache.loadingCache);
目的：覆盖之前源码。
4.项目实列代码如下：
List<ExportView> paramsList = new ArrayList<>();
Map<String,Object> map1 = new HashMap<>();
map1.put("fileName","授信证件资料明细表");
map1.put("title","授信证件资料明细");
map1.put("sheetName","授信证件资料明细表");
map1.put("tClass",new CreditTciItem());
POICacheManager.setFileLoderOnce(new FileLoaderImplOnce());
ImageCache.setLoadingCache(ImageLoadCache.loadingCache);
String path = "http://*******.com/scmplus";
for(CreditTciItem i : list3){
if(StringUtils.isNotBlank(i.getImgPath())){
i.setImgPath(path + i.getImgPath());
}
}
map1.put("datas",list3);
paramsList.add(getExportDate(map1));
/**
* 封装导出Excel参数
* @param map
* @return
*/
public ExportView getExportDate(Map<String,Object> map) throws Exception {
HashMap<Map<String,Boolean>, List<ExcelExportEntity>> addMap = new HashMap<>();
HashMap<String, Boolean> map1 = new HashMap<>();
map1.put(map.get("fileName").toString(),true);
List<ExcelExportEntity> excelExportEntities = new ArrayList<>();
ExcelExportEntity excelExportEntity = new ExcelExportEntity();
excelExportEntities.add(excelExportEntity);
addMap.put(map1,excelExportEntities);
String time = new SimpleDateFormat("yyyyMMddHHmmss").format(new Date());
ExportView exportView = new ExportView(map.get("fileName").toString() + time,map.get("title").toString(),map.get("sheetName").toString());
exportView.setExportMode(ExportModeEnum.SINGLE);
exportView.setEntityCls(map.get("tClass").getClass());
exportView.setAddMap(addMap);
ExportParams exportParams = exportView.getExportParams();
exportParams.setType(ExcelType.HSSF);
exportParams.setTitleHeight((short) 15);
exportParams.setStyle(ExcelExportStylerImpl.class);
exportView.setDataList((List<Object>)map.get("datas"));
return exportView;
}
