FileUtils.getContentType的准确性优化，有时候会对下载视频播放造成影响；

common/src/main/java/com/jeesite/common/io/FileUtils.java

@@ -44,6 +44,7 @@ import net.sf.jmimemagic.MagicMatch;
 public class FileUtils extends org.apache.commons.io.FileUtils {
 
 	private static Logger logger = LoggerFactory.getLogger(FileUtils.class);
+	private static MimetypesFileTypeMap mimetypesFileTypeMap;
 	
 	/**
 	 * 复制单个文件，如果目标文件存在，则不覆盖
@@ -654,7 +655,10 @@ public class FileUtils extends org.apache.commons.io.FileUtils {
 	 * @return 返回文件类型
 	 */
 	public static String getContentType(String fileName) {
-		return new MimetypesFileTypeMap().getContentType(fileName);
+		if (mimetypesFileTypeMap == null){
+			mimetypesFileTypeMap = new MimetypesFileTypeMap();
+		}
+		return mimetypesFileTypeMap.getContentType(fileName);
 	}
 	
 	/**

common/src/main/resources/META-INF/mime.types

@@ -0,0 +1,87 @@
+
+text/html                             html htm shtml
+text/css                              css
+text/xml                              xml
+image/gif                             gif
+image/jpeg                            jpeg jpg
+application/javascript                js
+application/atom+xml                  atom
+application/rss+xml                   rss
+
+text/mathml                           mml
+text/plain                            txt
+text/vnd.sun.j2me.app-descriptor      jad
+text/vnd.wap.wml                      wml
+text/x-component                      htc
+
+image/png                             png
+image/tiff                            tif tiff
+image/vnd.wap.wbmp                    wbmp
+image/x-icon                          ico
+image/x-jng                           jng
+image/x-ms-bmp                        bmp
+image/svg+xml                         svg svgz
+image/webp                            webp
+
+application/font-woff                 woff
+application/java-archive              jar war ear
+application/json                      json
+application/mac-binhex40              hqx
+application/msword                    doc
+application/pdf                       pdf
+application/postscript                ps eps ai
+application/rtf                       rtf
+application/vnd.apple.mpegurl         m3u8
+application/vnd.ms-excel              xls
+application/vnd.ms-fontobject         eot
+application/vnd.ms-powerpoint         ppt
+application/vnd.wap.wmlc              wmlc
+application/vnd.google-earth.kml+xml  kml
+application/vnd.google-earth.kmz      kmz
+application/x-7z-compressed           7z
+application/x-cocoa                   cco
+application/x-java-archive-diff       jardiff
+application/x-java-jnlp-file          jnlp
+application/x-makeself                run
+application/x-perl                    pl pm
+application/x-pilot                   prc pdb
+application/x-rar-compressed          rar
+application/x-redhat-package-manager  rpm
+application/x-sea                     sea
+application/x-shockwave-flash         swf
+application/x-stuffit                 sit
+application/x-tcl                     tcl tk
+application/x-x509-ca-cert            der pem crt
+application/x-xpinstall               xpi
+application/xhtml+xml                 xhtml
+application/xspf+xml                  xspf
+application/zip                       zip
+
+application/octet-stream              bin exe dll
+application/octet-stream              deb
+application/octet-stream              dmg
+application/octet-stream              iso img
+application/octet-stream              msi msp msm
+
+application/vnd.openxmlformats-officedocument.wordprocessingml.document    docx
+application/vnd.openxmlformats-officedocument.spreadsheetml.sheet          xlsx
+application/vnd.openxmlformats-officedocument.presentationml.presentation  pptx
+
+audio/midi                            mid midi kar
+audio/mpeg                            mp3
+audio/ogg                             ogg
+audio/x-m4a                           m4a
+audio/x-realaudio                     ra
+
+video/3gpp                            3gpp 3gp
+video/mp2t                            ts
+video/mp4                             mp4
+video/mpeg                            mpeg mpg
+video/quicktime                       mov
+video/webm                            webm
+video/x-flv                           flv
+video/x-m4v                           m4v
+video/x-mng                           mng
+video/x-ms-asf                        asx asf
+video/x-ms-wmv                        wmv
+video/x-msvideo                       avi

modules/core/src/main/resources/config/jeesite-core.yml

@@ -485,8 +485,8 @@ file:
 #    application/vnd.ms-excel,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,
 #    application/vnd.ms-powerpoint,application/vnd.openxmlformats-officedocument.presentationml.presentation
 
-  # 是否已文件流方式下载
-  isFileStreamDown: false
+  # 是否用文件流方式下载（支持断点续传）
+  isFileStreamDown: true
   
 #======================================#
 #========== Message settings ==========#

web/src/main/resources/config/application.yml

@@ -497,7 +497,7 @@ logging:
 ##    application/vnd.ms-excel,application/vnd.openxmlformats-officedocument.spreadsheetml.sheet,
 ##    application/vnd.ms-powerpoint,application/vnd.openxmlformats-officedocument.presentationml.presentation
 #
-#  # 是否已文件流方式下载
+#  # 是否用文件流方式下载（支持断点续传）
 #  isFileStreamDown: true
   
 #======================================#