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tif图片预览。根据 @gaoxingzaq 反馈和帮助，修改tif文件的jpg、pdf模式预览功能，兼容多页tif的pdf转换、jpg转换，以及jpg在线多页预览功能。

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This commit is contained in:
zhangzhen1979
2021-12-16 17:05:18 +08:00
committed by kl
parent 20f328906c
commit 48f6a507dc
2 changed files with 204 additions and 71 deletions
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77
server/src/main/java/cn/keking/service/impl/TiffFilePreviewImpl.java
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@ -2,7 +2,6 @@ package cn.keking.service.impl;
import cn.keking.config.ConfigConstants;
import cn.keking.model.FileAttribute;
import cn.keking.model.FileType;
import cn.keking.model.ReturnResponse;
import cn.keking.service.FilePreview;
import cn.keking.utils.ConvertPicUtil;
@ -16,7 +15,6 @@ import org.springframework.util.StringUtils;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
/**
* tiff 图片文件处理
@ -58,50 +56,53 @@ public class TiffFilePreviewImpl implements FilePreview {
}else if("jpg".equalsIgnoreCase(tifPreviewType) || "pdf".equalsIgnoreCase(tifPreviewType)){
String inputFileName = url.substring(url.lastIndexOf("/") + 1);
String inputFileExt = inputFileName.substring(inputFileName.lastIndexOf(".") + 1);
String uuid = UUID.randomUUID().toString().replaceAll("-","");
String tiffFileName = uuid + "." + inputFileExt;
String inputFileNamePrefix = inputFileName.substring(0, inputFileName.lastIndexOf("."));
ReturnResponse<String> response = DownloadUtils.downLoad(fileAttribute, tiffFileName);
if (response.isFailure()) {
return NOT_SUPPORTED_FILE_PAGE;
String strLocalTif = fileDir + inputFileName;
File fileTiff = new File(strLocalTif);
// 如果本地不存在这个tif文件，则下载
if(!fileTiff.exists()){
ReturnResponse<String> response = DownloadUtils.downLoad(fileAttribute, inputFileName);
if (response.isFailure()) {
return NOT_SUPPORTED_FILE_PAGE;
}
}
String strTiffPath = response.getContent();
File fileTiff = new File(strTiffPath);
File fileJpg = ConvertPicUtil.convertPic2Jpg(strTiffPath, fileDir + uuid + ".jpg");
if(fileJpg.exists()){
// 转换后的tif没用了，可以删掉了
if(fileTiff.exists()){
fileTiff.delete();
String baseUrl = BaseUrlFilter.getBaseUrl();
if("pdf".equalsIgnoreCase(tifPreviewType)){
// 以PDF模式预览的过程
File filePdf = new File(fileDir + inputFileNamePrefix + ".pdf");
// 如果本地不存在对应的pdf，则调用转换过程。否则直接用现有的pdf文件
if(!filePdf.exists()){
filePdf = ConvertPicUtil.convertTif2Pdf(strLocalTif, fileDir + inputFileNamePrefix + ".pdf");
}
String baseUrl = BaseUrlFilter.getBaseUrl();
if("pdf".equalsIgnoreCase(tifPreviewType)){
File filePdf = ConvertPicUtil.convertJpg2Pdf(fileDir + uuid + ".jpg", fileDir + uuid + ".pdf");
if(filePdf.exists()){
String pdfUrl = baseUrl + uuid + ".pdf";
model.addAttribute("pdfUrl", pdfUrl);
// 如果pdf已经存在，则将url路径加入到对象中，返回给页面
if(filePdf.exists()){
String pdfUrl = baseUrl + inputFileNamePrefix + ".pdf";
model.addAttribute("pdfUrl", pdfUrl);
return PDF_FILE_PREVIEW_PAGE;
}
}else{
String jpgUrl = baseUrl + uuid + ".jpg";
fileAttribute.setName(uuid + ".jpg");
fileAttribute.setType(FileType.PICTURE);
fileAttribute.setSuffix("jpg");
fileAttribute.setUrl(jpgUrl);
List<String> imgUrls = new ArrayList<>();
imgUrls.add(jpgUrl);
model.addAttribute("imgUrls", imgUrls);
model.addAttribute("currentUrl", jpgUrl);
return PDF_FILE_PREVIEW_PAGE;
}
}else{
// 以JPG模式预览的过程
String strJpgFilePathName = fileDir + inputFileNamePrefix + ".jpg";
// 将tif转换为jpg，返回转换后的文件路径、文件名的list
List<String> listPic2Jpg = ConvertPicUtil.convertTif2Jpg(strLocalTif, strJpgFilePathName);
// 将返回页面的图片url的list对象
List<String> listImageUrls = new ArrayList<>();
// 循环，拼装url的list对象
for(String strJpg : listPic2Jpg){
listImageUrls.add(baseUrl + strJpg);
}
model.addAttribute("imgUrls", listImageUrls);
model.addAttribute("currentUrl", listImageUrls.get(0));
}
// 转换后的tif没用了，可以删掉了
if(fileTiff.exists()){
fileTiff.delete();
}
return PICTURE_FILE_PREVIEW_PAGE;