java库从文件内容中找到mime类型

我正在搜索一个java库，通过查看文件内容（字节数组）告诉你mime类型。 我发现这个项目使用jmimemagic，它不再支持更新的文件类型（例如MS word docx格式），因为它现在处于非活动状态（从2006年开始）。

Answer 1

对于那些需要最常用的办公格式（并且不使用Apache Tika）的人来说可能有用：

public class MimeTypeUtils { private static final Map fileExtensionMap; static { fileExtensionMap = new HashMap(); // MS Office fileExtensionMap.put("doc", "application/msword"); fileExtensionMap.put("dot", "application/msword"); fileExtensionMap.put("docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"); fileExtensionMap.put("dotx", "application/vnd.openxmlformats-officedocument.wordprocessingml.template"); fileExtensionMap.put("docm", "application/vnd.ms-word.document.macroEnabled.12"); fileExtensionMap.put("dotm", "application/vnd.ms-word.template.macroEnabled.12"); fileExtensionMap.put("xls", "application/vnd.ms-excel"); fileExtensionMap.put("xlt", "application/vnd.ms-excel"); fileExtensionMap.put("xla", "application/vnd.ms-excel"); fileExtensionMap.put("xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"); fileExtensionMap.put("xltx", "application/vnd.openxmlformats-officedocument.spreadsheetml.template"); fileExtensionMap.put("xlsm", "application/vnd.ms-excel.sheet.macroEnabled.12"); fileExtensionMap.put("xltm", "application/vnd.ms-excel.template.macroEnabled.12"); fileExtensionMap.put("xlam", "application/vnd.ms-excel.addin.macroEnabled.12"); fileExtensionMap.put("xlsb", "application/vnd.ms-excel.sheet.binary.macroEnabled.12"); fileExtensionMap.put("ppt", "application/vnd.ms-powerpoint"); fileExtensionMap.put("pot", "application/vnd.ms-powerpoint"); fileExtensionMap.put("pps", "application/vnd.ms-powerpoint"); fileExtensionMap.put("ppa", "application/vnd.ms-powerpoint"); fileExtensionMap.put("pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"); fileExtensionMap.put("potx", "application/vnd.openxmlformats-officedocument.presentationml.template"); fileExtensionMap.put("ppsx", "application/vnd.openxmlformats-officedocument.presentationml.slideshow"); fileExtensionMap.put("ppam", "application/vnd.ms-powerpoint.addin.macroEnabled.12"); fileExtensionMap.put("pptm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12"); fileExtensionMap.put("potm", "application/vnd.ms-powerpoint.presentation.macroEnabled.12"); fileExtensionMap.put("ppsm", "application/vnd.ms-powerpoint.slideshow.macroEnabled.12"); // Open Office fileExtensionMap.put("odt", "application/vnd.oasis.opendocument.text"); fileExtensionMap.put("ott", "application/vnd.oasis.opendocument.text-template"); fileExtensionMap.put("oth", "application/vnd.oasis.opendocument.text-web"); fileExtensionMap.put("odm", "application/vnd.oasis.opendocument.text-master"); fileExtensionMap.put("odg", "application/vnd.oasis.opendocument.graphics"); fileExtensionMap.put("otg", "application/vnd.oasis.opendocument.graphics-template"); fileExtensionMap.put("odp", "application/vnd.oasis.opendocument.presentation"); fileExtensionMap.put("otp", "application/vnd.oasis.opendocument.presentation-template"); fileExtensionMap.put("ods", "application/vnd.oasis.opendocument.spreadsheet"); fileExtensionMap.put("ots", "application/vnd.oasis.opendocument.spreadsheet-template"); fileExtensionMap.put("odc", "application/vnd.oasis.opendocument.chart"); fileExtensionMap.put("odf", "application/vnd.oasis.opendocument.formula"); fileExtensionMap.put("odb", "application/vnd.oasis.opendocument.database"); fileExtensionMap.put("odi", "application/vnd.oasis.opendocument.image"); fileExtensionMap.put("oxt", "application/vnd.openofficeorg.extension"); } public static String getContentTypeByFileName(String fileName) { // 1. first use java's buildin utils FileNameMap mimeTypes = URLConnection.getFileNameMap(); String contentType = mimeTypes.getContentTypeFor(fileName); // 2. nothing found -> lookup our in extension map to find types like ".doc" or ".docx" if (!StringUtils.hasText(contentType)) { String extension = FilenameUtils.getExtension(fileName); contentType = fileExtensionMap.get(extension); } return contentType; } } 

Answer 2

使用Apache tika进行内容检测。 请在下面找到链接。 http://tika.apache.org/0.8/detection.html 。 我们有很多jar依赖项，你可以在使用maven构建tika时找到它们

  ByteArrayInputStream bai = new ByteArrayInputStream(pByte); ContentHandler contenthandler = new BodyContentHandler(); Metadata metadata = new Metadata(); Parser parser = new AutoDetectParser(); try { parser.parse(bai, contenthandler, metadata); } catch (IOException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SAXException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (TikaException e) { // TODO Auto-generated catch block e.printStackTrace(); } System.out.println("Mime: " + metadata.get(Metadata.CONTENT_TYPE)); return metadata.get(Metadata.CONTENT_TYPE); 

Answer 3

我使用javax.activation.MimetypesFileTypeMap 。 它以一个小集合开头： $JRE_HOME/lib/content-types.properties ，但您可以添加自己的。 以MimetypesFileTypeMap的javadoc中显示的格式创建一个文件mime.types （我从网上开始一个大的列表，按摩它，并添加我发现丢失的类型）。 现在，您可以通过打开mime.types文件并将其内容添加到地图中来添加代码。 但是，更简单的解决方案是将mime.types文件添加到jar的META-INF中。 java.activation会自动选择它。