base/file-online-preview
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* tif图片预览，改为支持转换为jpg后预览（JAI支持）；加入tif->jpg->pdf转换后，以pdf格式预览，此种模式可完美支持打印纸张自适应。

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This commit is contained in:
zhangzhen1979
2021-12-03 19:05:31 +08:00
committed by kl
parent 14151a6c46
commit b7760ab42a
7 changed files with 191 additions and 15 deletions
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1
server/src/main/java/cn/keking/service/FilePreview.java
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@ -15,7 +15,6 @@ public interface FilePreview {
String COMPRESS_FILE_PREVIEW_PAGE = "compress";
String MEDIA_FILE_PREVIEW_PAGE = "media";
String PICTURE_FILE_PREVIEW_PAGE = "picture";
String TIFF_FILE_PREVIEW_PAGE = "tiff";
String OFD_FILE_PREVIEW_PAGE = "ofd";
String OFFICE_PICTURE_FILE_PREVIEW_PAGE = "officePicture";
String TXT_FILE_PREVIEW_PAGE = "txt";

76
server/src/main/java/cn/keking/service/impl/TiffFilePreviewImpl.java
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@ -1,11 +1,20 @@
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.WebUtils;
import cn.keking.utils.ConvertPicUtil;
import cn.keking.utils.DownloadUtils;
import cn.keking.web.filter.BaseUrlFilter;
import org.springframework.stereotype.Service;
import org.springframework.ui.Model;
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
@ -16,9 +25,8 @@ import org.springframework.util.StringUtils;
public class TiffFilePreviewImpl implements FilePreview {
private final PictureFilePreviewImpl pictureFilePreview;
private static final String INITIALIZE_MEMORY_SIZE = "initializeMemorySize";
//默认初始化 50MB 内存
private static final long INITIALIZE_MEMORY_SIZE_VALUE_DEFAULT = 1024L * 1024 * 50;
private final String fileDir = ConfigConstants.getFileDir();
public TiffFilePreviewImpl(PictureFilePreviewImpl pictureFilePreview) {
this.pictureFilePreview = pictureFilePreview;
@ -26,13 +34,55 @@ public class TiffFilePreviewImpl implements FilePreview {
@Override
public String filePreviewHandle(String url, Model model, FileAttribute fileAttribute) {
pictureFilePreview.filePreviewHandle(url,model,fileAttribute);
String fileSize = WebUtils.getUrlParameterReg(url,INITIALIZE_MEMORY_SIZE);
if(StringUtils.hasText(fileSize)){
model.addAttribute(INITIALIZE_MEMORY_SIZE,fileSize);
}else {
model.addAttribute(INITIALIZE_MEMORY_SIZE,Long.toString(INITIALIZE_MEMORY_SIZE_VALUE_DEFAULT));
}
return TIFF_FILE_PREVIEW_PAGE;
String inputFileName = url.substring(url.lastIndexOf("/") + 1);
String inputFileExt = inputFileName.substring(inputFileName.lastIndexOf(".") + 1);
String uuid = UUID.randomUUID().toString().replaceAll("-","");
String tiffFileName = uuid + "." + inputFileExt;
ReturnResponse<String> response = DownloadUtils.downLoad(fileAttribute, tiffFileName);
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
fileTiff.delete();
String baseUrl = BaseUrlFilter.getBaseUrl();
if("pdf".equalsIgnoreCase(fileAttribute.getOfficePreviewType())){
File filePdf = ConvertPicUtil.convertJpg2Pdf(fileDir + uuid + ".jpg", fileDir + uuid + ".pdf");
if(filePdf.exists()){
// 转换后的jpg没用了，可以删掉了
fileJpg.delete();
String pdfUrl = baseUrl + uuid + ".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 PICTURE_FILE_PREVIEW_PAGE;
}
}