新功能点，加入CAD图纸.dwg文件预览

jodconverter-web/src/main/java/cn/keking/service/impl/CadFilePreviewImpl.java

@@ -0,0 +1,96 @@
+package cn.keking.service.impl;
+
+import cn.keking.config.ConfigConstants;
+import cn.keking.model.FileAttribute;
+import cn.keking.model.ReturnResponse;
+import cn.keking.service.FilePreview;
+import cn.keking.utils.CadToPdf;
+import cn.keking.utils.DownloadUtils;
+import cn.keking.utils.FileUtils;
+import cn.keking.utils.PdfUtils;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.ui.Model;
+import org.springframework.util.StringUtils;
+import org.springframework.web.context.request.RequestContextHolder;
+
+import java.util.List;
+
+/**
+ * @author chenjh
+ * @since 2019/11/21 14:28
+ */
+@Service
+public class CadFilePreviewImpl implements FilePreview {
+
+    private String fileDir = ConfigConstants.getFileDir();
+
+    @Autowired
+    private FileUtils fileUtils;
+
+    @Autowired
+    private DownloadUtils downloadUtils;
+
+    @Autowired
+    private CadToPdf cadToPdf;
+
+    @Autowired
+    private PdfUtils pdfUtils;
+
+    public static final String OFFICE_PREVIEW_TYPE_PDF = "pdf";
+    public static final String OFFICE_PREVIEW_TYPE_IMAGE = "image";
+    public static final String OFFICE_PREVIEW_TYPE_ALLIMAGES = "allImages";
+
+    @Override
+    public String filePreviewHandle(String url, Model model, FileAttribute fileAttribute) {
+        // 预览Type，参数传了就取参数的，没传取系统默认
+        String officePreviewType = model.asMap().get("officePreviewType") == null ? ConfigConstants.getOfficePreviewType() : model.asMap().get("officePreviewType").toString();
+        String baseUrl = (String) RequestContextHolder.currentRequestAttributes().getAttribute("baseUrl",0);
+        String suffix=fileAttribute.getSuffix();
+        String fileName=fileAttribute.getName();
+        String pdfName = fileName.substring(0, fileName.lastIndexOf(".") + 1) + "pdf";
+        String outFilePath = fileDir + pdfName;
+        // 判断之前是否已转换过，如果转换过，直接返回，否则执行转换
+        if (!fileUtils.listConvertedFiles().containsKey(pdfName) || !ConfigConstants.isCacheEnabled()) {
+            String filePath = fileDir + fileName;
+            ReturnResponse<String> response = downloadUtils.downLoad(fileAttribute, null);
+            if (0 != response.getCode()) {
+                model.addAttribute("fileType", suffix);
+                model.addAttribute("msg", response.getMsg());
+                return "fileNotSupported";
+            }
+            filePath = response.getContent();
+            if (StringUtils.hasText(outFilePath)) {
+                boolean convertResult = cadToPdf.cadToPdf(filePath, outFilePath);
+                if (!convertResult) {
+                    model.addAttribute("fileType", suffix);
+                    model.addAttribute("msg", "cad文件转换异常，请联系管理员");
+                    return "fileNotSupported";
+                }
+                if (ConfigConstants.isCacheEnabled()) {
+                    // 加入缓存
+                    fileUtils.addConvertedFile(pdfName, fileUtils.getRelativePath(outFilePath));
+                }
+            }
+        }
+        if (baseUrl != null && (OFFICE_PREVIEW_TYPE_IMAGE.equals(officePreviewType) || OFFICE_PREVIEW_TYPE_ALLIMAGES.equals(officePreviewType))) {
+            List<String> imageUrls = pdfUtils.pdf2jpg(outFilePath, pdfName, baseUrl);
+            if (imageUrls == null || imageUrls.size() < 1) {
+                model.addAttribute("msg", "office转图片异常，请联系管理员");
+                model.addAttribute("fileType",fileAttribute.getSuffix());
+                return "fileNotSupported";
+            }
+            model.addAttribute("imgurls", imageUrls);
+            model.addAttribute("currentUrl", imageUrls.get(0));
+            if (OFFICE_PREVIEW_TYPE_IMAGE.equals(officePreviewType)) {
+                return "officePicture";
+            } else {
+                return "picture";
+            }
+        }
+        model.addAttribute("pdfUrl", pdfName);
+        return "pdf";
+    }
+
+
+}