前言：之前做了将图片直接插入到excel的需求，由于数据太多会导致导出慢或者直接报错，于是采用了将图片和excel分开放在一个zip压缩包中，并且，excel中对应图片的列点击后可以直接超链接到对应的图片。
实现效果：
依赖版本：
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>easyexcel</artifactId>
<version>3.1.0</version>
</dependency>动态添加超链接处理类：
package com.aicut.monitor.utils;
import cn.hutool.core.util.StrUtil;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.WriteCellData;
import com.alibaba.excel.write.handler.CellWriteHandler;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.metadata.holder.WriteTableHolder;
import org.apache.poi.common.usermodel.HyperlinkType;
import org.apache.poi.ss.usermodel.*;
import java.util.List;
/**
* excel动态添加超链接处理类
*/
public class ExcelHyperlinkHandler implements CellWriteHandler {
/**
* 添加超链接的字段的下标
*/
private int[] mergeColumnIndex;
/**
* 从第几行开始添加，0代表标题行
*/
private int mergeRowIndex;
public ExcelHyperlinkHandler() {
}
public ExcelHyperlinkHandler(int mergeRowIndex, int[] mergeColumnIndex) {
this.mergeRowIndex = mergeRowIndex;
this.mergeColumnIndex = mergeColumnIndex;
}
@Override
public void beforeCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Row row,
Head head, Integer integer, Integer integer1, Boolean aBoolean) {
}
@Override
public void afterCellCreate(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, Cell cell,
Head head, Integer integer, Boolean aBoolean) {
}
@Override
public void afterCellDataConverted(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, WriteCellData<?> cellData, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
}
@Override
public void afterCellDispose(WriteSheetHolder writeSheetHolder, WriteTableHolder writeTableHolder, List<WriteCellData<?>> cellDataList, Cell cell, Head head, Integer relativeRowIndex, Boolean isHead) {
//当前行
int curRowIndex = cell.getRowIndex();
//当前列
int curColIndex = cell.getColumnIndex();
if (curRowIndex >= mergeRowIndex) {
for (int i = 0; i < mergeColumnIndex.length; i++) {
if (curColIndex == mergeColumnIndex[i]) {
mergeWithPrevRow(writeSheetHolder, cell, curRowIndex, curColIndex);
break;
}
}
}
}
private void mergeWithPrevRow(WriteSheetHolder writeSheetHolder, Cell cell, int curRowIndex, int curColIndex) {
//获得超链接，当前单元格的内容就是一个超链接
String stringCellValue = cell.getCellType()==CellType.STRING ? cell.getStringCellValue():null;
if (StrUtil.isNotBlank(stringCellValue)) {
CreationHelper creationHelper = writeSheetHolder.getSheet().getWorkbook().getCreationHelper();
Hyperlink hyperlink = creationHelper.createHyperlink(HyperlinkType.URL);
hyperlink.setAddress(stringCellValue);
cell.setHyperlink(hyperlink);//添加超链接
}
}
}导出zip方法：
@PostMapping("/exportZip")
public void exportZip(HttpServletResponse response,
@RequestParam(value = "startTime",required = false)String startTime,
@RequestParam(value = "endTime",required = false)String endTime,
@RequestParam(value = "deviceName",required = false)String deviceName) throws IOException {
List<CutterImageVO> cutterImageVOList = CutterImageService.getCutterImageList(startTime, endTime, deviceName);
String fileName = "豁口图片数据";
response.setCharacterEncoding("utf-8");
response.setContentType("application/zip");
response.setHeader("Content-Disposition", "attachment;filename=" + URLEncoder.encode(fileName + ".zip", "UTF-8"));
//easyExcelUtil.exportExcelInZip(response,fileName,"豁口图片数据",CutterImageVO.class, cutterImageVOList);
ServletOutputStream outputStream = response.getOutputStream();
ZipOutputStream zipOutputStream = new ZipOutputStream(outputStream);
byte[] buf = new byte[1024];
try {
GetPresignedObjectUrlArgs args = null;
for (CutterImageVO cutterImageVO : cutterImageVOList) {
args = GetPresignedObjectUrlArgs.builder()
.bucket(minioConfig.getBucketName())
.object(cutterImageVO.getImageUrl())
.expiry(1, TimeUnit.DAYS)
.method(Method.GET)
.build();
String imgUrl = client.getPresignedObjectUrl(args);
URL url = new URL(imgUrl);
URLConnection conn = url.openConnection();
InputStream in = conn.getInputStream();
zipOutputStream.putNextEntry(new ZipEntry(cutterImageVO.getImageUrl()));
int len = -1;
while ((len=in.read(buf))!=-1){
zipOutputStream.write(buf,0,len);
}
in.close();
}
//构建一个excel对象,这里注意type要是xls不能是xlsx,否则下面的写入后流会关闭,导致报错
ExcelWriter excelWriter = EasyExcel.write()
.excelType(ExcelTypeEnum.XLS)
.registerWriteHandler(new ExcelHyperlinkHandler(1, new int[]{7}))
.build();
//构建一个sheet页
WriteSheet writeSheet = EasyExcel.writerSheet(fileName).build();
//构建excel表头信息
WriteTable writeTable0 = EasyExcel.writerTable(0).head(CutterImageVO.class).needHead(Boolean.TRUE).build();
//将表头和数据写入表格
excelWriter.write(cutterImageVOList, writeSheet, writeTable0);
//创建压缩文件
ZipEntry zipEntry = new ZipEntry(fileName + ".xls");
zipOutputStream.putNextEntry(zipEntry);
Workbook workbook = excelWriter.writeContext().writeWorkbookHolder().getWorkbook();
//将excel对象以流的形式写入压缩流
workbook.write(zipOutputStream);
}catch (Exception e){
log.error(e.getMessage(), e);
//抛出异常结束程序
throw new RuntimeException("数据导出接口异常");
}finally {
IOUtils.closeQuietly(zipOutputStream);
IOUtils.closeQuietly(outputStream);
}
}参考博客：
easyExcel导出功能+图片压缩打包成ZIP，实现浏览器自动下载_eazyexcel 导出excel打包成zip-CSDN博客
使用EasyExcel动态合并单元格和对指定列添加超链接_easyexcel 超链接-CSDN博客
Java代码实现Excel导出多份文件并压缩成zip包保存到OSS服务器返回URL访问下载_java 将文件压缩成压缩包存储到服务器-CSDN博客
