此处作一下小的汇总，
针对Jetty容器内，存在excel的xlsx文件直接经过连接的方式下载的时候，若是是在Chrome浏览器时，则直接触发浏览器的下载行为，
可是在IE11的浏览器上，则浏览器会直接进行打开该文件，重点是浏览器进行打开该文件的时候，打开后必然是乱码的，这中状况必然是错误的，
可是若是是xls的Excel文件也是就2007老版本的excel文件，则IE浏览器便会提示进行下载，因此缘由即是当浏览器支持该文件格式的预览的时候，
则直接打开，不支持时则默认为下载提示，（由于此处是直接访问Jetty容器中的excel文件，而不是代码中经过流的方式返回的文件流，若是是代码中
返回文件流，则直接设置对应的response的响应类型为download便可，但此处既然是经过Jetty默认的方式进行的文件下载，则1.更改Jetty的默认配置，
配置使其在下载指定类型的流文件时，使其重复浏览器的下载行为，而并不是直接打开的行为，2.则是设置浏览器IE的行为，针对某一类型的文件流，默认不进行打开的设置，
此处使用设置Jetty方式进行调整，即设置Jetty的MIME协议类型映射，针对xls和xlsx文件类型，统一映射的MIME类型为application/msexcel，
Jetty中的配置方式则为：更改Jetty下etc目录下的webDefault.xml的配置，增长MIME类型的协议映射，
截图配置以下：
此处主要另外还说明一点则是：针对Jetty中间件对请求的编码的映射，等等也是在该webdefault.xml中进行配置，如该文件中的： <locale-encoding-mapping-list>用于配置指定编码映射，
可参考：https://www.cnblogs.com/gis2s/articles/3321893.html，包括对应的Jetty对静态文件的缓存的去除也是能够配置该文件的useFileMappedBuffer属性，参考：
https://blog.csdn.net/wwsscc168/article/details/51095099，而对于配置当前Jetty对线程数量的支持，以及访问的超时时间等，能够详细了接下jetty.xml的一些配置信息，
附上百度百科对MIME协议的讲解截图：
转自：https://blog.csdn.net/wxwlife2006/article/details/8115273#commentBoxjavascript
这几天一贯很纳闷，在Tomcat安排的网站中的下载文件中，如果文件是rar类型的，一点击下载rar文件就直接打开，而且呈现乱码，右键另存为浏览器也是默认为html格局，一贯认为是浏览器IE的题目，后来发明其实不关浏览器的题目，而是Tomcat办事器设备的题目，具体以下：php
web.xml文件中设备<mime-mapping>下载文件类型
TOMCAT在默认景象下下载.rar的文件是把文件算做text打开，以致于IE打开RAR文件为乱码，如果碰到这种景象时没必要认为是浏览器的题目，大多半浏览器应当不会逝世皮赖脸地把二进制文件算做文本打开，通常都是办事器给什么浏览器就开什么.解决办法: css
打开conf/web.xml，参加下面的代码. html
<mime-mapping> <extension>doc</extension> <mime-type>application/msword</mime-type> </mime-mapping> <mime-mapping> <extension>xls</extension> <mime-type>application/msexcel</mime-type> </mime-mapping> <mime-mapping> <extension>pdf</extension> <mime-type>application/pdf</mime-type> </mime-mapping> <mime-mapping> <extension>zip</extension> <mime-type>application/zip</mime-type> </mime-mapping> <mime-mapping> <extension>rar</extension> <mime-type>application/rar</mime-type> </mime-mapping> <mime-mapping> <extension>txt</extension> <mime-type>application/txt</mime-type> </mime-mapping> <mime-mapping> <extension>chm</extension> <mime-type>application/mshelp</mime-type> </mime-mapping> <mime-mapping> <extension>mp3</extension> <mime-type>audio/x-mpeg</mime-type> </mime-mapping>
重启TOMCAT，清除IE缓存，再打开RAR的文件时就能够正常下载了. java
不合的ContentType 会影响客户端所看到的结果.web
默认的ContentType为 text/html 也就是网页格局.浏览器
代码如:缓存
<％
response.ContentType
=
"
text/html
"
％>
<!--
＃i nclude virtual
=
"
/ContentType.html
"
-->
显示的为网页，而app
<％
response.ContentType
=
"
text/plain
"
％>
<!--
＃i nclude virtual
=
"
/sscript/ContentType.html
"
-->
则会显示html原代码.koa
如下为一些经常使用的 ContentType
GIF images
<％
response.ContentType
=
"
image/gif
"
％>
<!--
＃i nclude virtual
=
"
/myimage.gif
"
-->
JPEG images
<％
response.ContentType
=
"
image/jpeg
"
％>
<!--
＃i nclude virtual
=
"
/myimage.jpeg
"
-->
TIFF images
<％
response.ContentType
=
"
image/tiff
"
％>
<!--
＃i nclude virtual
=
"
/myimage.tiff
"
-->
MICROSOFT WORD document
<％
response.ContentType
=
"
application/msword
"
％>
<!--
＃i nclude virtual
=
"
/myfile.doc
"
-->
RTF document
<％
response.ContentType
=
"
application/rtf
"
％>
<!--
＃i nclude virtual
=
"
/myfile.rtf
"
-->
MICROSOFT EXCEL document
<％
response.ContentType
=
"
application/x-excel
"
％>
<!--
＃i nclude virtual
=
"
/myfile.xls
"
-->
MICROSOFT POWERPOINT document
<％
response.ContentType
=
"
application/ms-powerpoint
"
％>
<!--
＃i nclude virtual
=
"
/myfile.pff
"
-->
PDF document
<％
response.ContentType
=
"
application/pdf
"
％>
<!--
＃i nclude virtual
=
"
/myfile.pdf
"
-->
ZIP document
<％
response.ContentType
=
"
application/zip
"
％>
<!--
＃i nclude virtual
=
"
/myfile.zip
"
-->
下面是更具体的ContentType
application
/
andrew
-
inset ez application
/
mac
-
binhex40 hqx application
/
mac
-
compactpro cpt application
/
mathml
+
xml mathml application
/
msword doc application
/
octet
-
stream bin dms lha lzh exe
class
so dll application
/
oda oda application
/
ogg ogg application
/
pdf pdf application
/
postscript ai eps ps application
/
rdf
+
xml rdf application
/
smil smi smil application
/
srgs gram application
/
srgs
+
xml grxml application
/
vnd.mif mif application
/
vnd.mozilla.xul
+
xml xul application
/
vnd.ms
-
excel xls application
/
vnd.ms
-
powerpoint ppt application
/
vnd.wap.wbxml wbxml application
/
vnd.wap.wmlc .wmlc wmlc application
/
vnd.wap.wmlscriptc .wmlsc wmlsc application
/
voicexml
+
xml vxml application
/
x
-
bcpio bcpio application
/
x
-
cdlink vcd application
/
x
-
chess
-
pgn pgn application
/
x
-
cpio cpio application
/
x
-
csh csh application
/
x
-
director dcr dir dxr application
/
x
-
dvi dvi application
/
x
-
futuresplash spl application
/
x
-
gtar gtar application
/
x
-
hdf hdf application
/
x
-
httpd
-
php .php .php4 .php3 .phtml application
/
x
-
httpd
-
php
-
source .phps application
/
x
-
javascript js application
/
x
-
koan skp skd skt skm application
/
x
-
latex latex application
/
x
-
netcdf nc cdf application
/
x
-
pkcs7
-
crl .crl application
/
x
-
sh sh application
/
x
-
shar shar application
/
x
-
shockwave
-
flash swf application
/
x
-
stuffit sit application
/
x
-
sv4cpio sv4cpio application
/
x
-
sv4crc sv4crc application
/
x
-
tar .tgz tar application
/
x
-
tcl tcl application
/
x
-
tex tex application
/
x
-
texinfo texinfo texi application
/
x
-
troff t tr roff application
/
x
-
troff
-
man man application
/
x
-
troff
-
me me application
/
x
-
troff
-
ms ms application
/
x
-
ustar ustar application
/
x
-
wais
-
source src application
/
x
-
x509
-
ca
-
cert .crt application
/
xhtml
+
xml xhtml xht application
/
xml xml xsl application
/
xml
-
dtd dtd application
/
xslt
+
xml xslt application
/
zip zip audio
/
basic au snd audio
/
midi mid midi kar audio
/
mpeg mpga mp2 mp3 audio
/
x
-
aiff aif aiff aifc audio
/
x
-
mpegurl m3u audio
/
x
-
pn
-
realaudio ram rm audio
/
x
-
pn
-
realaudio
-
plugin rpm audio
/
x
-
realaudio ra audio
/
x
-
wav wav chemical
/
x
-
pdb pdb chemical
/
x
-
xyz xyz image
/
bmp bmp image
/
cgm cgm image
/
gif gif image
/
ief ief image
/
jpeg jpeg jpg jpe image
/
png png image
/
svg
+
xml svg image
/
tiff tiff tif image
/
vnd.djvu djvu djv image
/
vnd.wap.wbmp .wbmp wbmp image
/
x
-
cmu
-
raster ras image
/
x
-
icon ico image
/
x
-
portable
-
anymap pnm image
/
x
-
portable
-
bitmap pbm image
/
x
-
portable
-
graymap pgm image
/
x
-
portable
-
pixmap ppm image
/
x
-
rgb rgb image
/
x
-
xbitmap xbm image
/
x
-
xpixmap xpm image
/
x
-
xwindowdump xwd model
/
iges igs iges model
/
mesh msh mesh silo model
/
vrml wrl vrml text
/
calendar ics ifb text
/
css css text
/
html .shtml html htm text
/
plain asc txt text
/
richtext rtx text
/
rtf rtf text
/
sgml sgml sgm text
/
tab
-
separated
-
values tsv text
/
vnd.wap.wml .wml wml text
/
vnd.wap.wmlscript .wmls wmls text
/
x
-
setext etx video
/
mpeg mpeg mpg mpe video
/
quicktime qt mov video
/
vnd.mpegurl mxu video
/
x
-
msvideo avi video
/
x
-
sgi
-
movie movie x
-
conference
/
x
-
cooltalk ice
TXT文件作下载的JS实现
<％...＠ page contentType="text/html; charset=gb2312" language="java" ％> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312"> <title>无题目文档</title> <script language="JavaScript">... function openfile（url） ...{ var a =window.open（url，"_blank"，""）; a.document.execCommand（"SaveAs"）; a.close（）; } </script> </head> <body> <p><a href="＃" onclick=""openfile（"aa.txt"）"">下载</a></p> </body> </html> 转载请注明出处［http://samlin.cnblogs.com/］