这个在struts2的doc中已经有所说明,但是说得并不详细,而且他给的例子是有错误的,下面我将列出文件上传并限制类型的具体步骤
struts2版本是2.1.6
struts2是根据contentType来限制的,并不是文件的扩展名
比如我想仅上传image/png,image/gif,image/jpeg这三种文件类型
第一种方法是通过javascript校验来限制,这个比较简单,获取input的value然后截取扩展名进行判断即可
第二种是根据struts2自带的fileupload拦截器中提供的allowedTypes来进行限制,步骤如下:
1 配置fileupload拦截器
struts2的defaultStack中已经含有fileupload拦截器,如果想加入allowedTypes参数,需要从新写一个defaultstack ,拷贝过来修改一下即可:
<
interceptor-stack
name
="myDefaultStack"
>
<
interceptor-ref
name
="exception"
/>
<
interceptor-ref
name
="alias"
/>
<
interceptor-ref
name
="servletConfig"
/>
<
interceptor-ref
name
="i18n"
/>
<
interceptor-ref
name
="prepare"
/>
<
interceptor-ref
name
="chain"
/>
<
interceptor-ref
name
="debugging"
/>
<
interceptor-ref
name
="profiling"
/>
<
interceptor-ref
name
="scopedModelDriven"
/>
<
interceptor-ref
name
="modelDriven"
/>
<
interceptor-ref
name
="fileUpload"
>
<
param
name
="allowedTypes"
>
image/png,image/gif,image/jpeg
</
param
>
</
interceptor-ref
>
<
interceptor-ref
name
="checkbox"
/>
<
interceptor-ref
name
="staticParams"
/>
<
interceptor-ref
name
="actionMappingParams"
/>
<
interceptor-ref
name
="params"
>
<
param
name
="excludeParams"
>
dojo\..*,^struts\..*
</
param
>
</
interceptor-ref
>
<
interceptor-ref
name
="conversionError"
/>
<
interceptor-ref
name
="validation"
>
<
param
name
="excludeMethods"
>
input,back,cancel,browse
</
param
>
</
interceptor-ref
>
<
interceptor-ref
name
="workflow"
>
<
param
name
="excludeMethods"
>
input,back,cancel,browse
</
param
>
</
interceptor-ref
>
</
interceptor-stack
>
</
interceptors
>
<
default-interceptor-ref
name
="myDefaultStack"
></
default-interceptor-ref
>
仅修改代码中的
<
interceptor-ref
name
="fileUpload"
>
<
param
name
="allowedTypes"
>
image/png,image/gif,image/jpeg
</
param
>
</
interceptor-ref
>
上面配置的是上传文件类型的限制,其实共有两个参数
maximumSize (可选)
-
这个拦截器允许的上传到action中的文件最大长度(以byte为单位). 注意这个参数和在webwork.properties中定义的属性没有关系,默认2MB
allowedTypes (可选)
-
以逗号分割的contentType类型列表(例如text
/
html),这些列表是这个拦截器允许的可以传到action中的contentType.如果没有指定就是允许任何上传类型.
2 jsp页面定义如下(
testFileUpload.jsp)
<
s:form
action
="testFileUpload"
method
="post"
enctype
="multipart/form-data"
>
<
s:file
name
="file"
theme
="simple"
/>
<
s:fielderror
name
="file"
></
s:fielderror
>
<
s:submit
/>
</
s:form
>
3 后台的action声明如下(我用的是struts2的注解进行action配置)
public
class
TestFileUploadAction
extends
ActionSupport{
private
File file;
private
String fileContentType;
private
String fileFileName;
@Action(
value
=
"
testFileUpload
"
, results
=
{
@Result(name
=
"
input
"
, location
=
"
/testFileUpload.jsp
"
),
@Result(name
=
"
success
"
, location
=
"
/testFileUploadSuccess.jsp
"
)
}
)
public
String execute() {
return
SUCCESS;
}
get/set......
}
注意:如果jsp中file的name="xxx",那么后台action中的属性要做相应更改为
private
File xxx
;
private
String xxx
ContentType;
private
String xxx
FileName;
同时注意大小写一定要一致
4 定义错误文件类型的消息提示,这个需要用到struts2的资源文件,在struts.properties文件中加入
struts.custom.i18n.resources
=
globalMessages
globalMessages对应着资源文件名
5 在源文件夹下定义资源文件
globalMessages.properties,并在里面加入如下信息:
struts.messages.error.content.type.not.allowed
=
upload file contenttype is invalidate
这里稍作说明(拷贝一下struts2的帮助):
如果你的action实现了ValidationAware接口(如果action继承了ActionSupport,那么就相当于实现了ValidationAware),这个拦截器就可以添加几种字段错误.这些错误信息是基于存储在struts-messages.properties文件中的一些i18n值,这个文件是所有i18n请求的默认文件.你可以在自己消息文件的复写以下key的消息文字
struts.messages.error.uploading
-
文件不能上传的通用错误信息
struts.messages.error.file.too.large
-
上传文件长度过大的错误信息
struts.messages.error.content.type.not.allowed
-
当上传文件不符合指定的contentType
以上配置完毕后,测试一下,对于非法的contentType,例如xxx.log这个文件的的contentType是pplication/octet-stream
会给出提示:
upload file contenttype is invalidate
'.a' : 'application/octet-stream',
'.ai' : 'application/postscript',
'.aif' : 'audio/x-aiff',
'.aifc' : 'audio/x-aiff',
'.aiff' : 'audio/x-aiff',
'.au' : 'audio/basic',
'.avi' : 'video/x-msvideo',
'.bat' : 'text/plain',
'.bcpio' : 'application/x-bcpio',
'.bin' : 'application/octet-stream',
'.bmp' : 'image/x-ms-bmp',
'.c' : 'text/plain',
'.cdf' : 'application/x-cdf',
'.cdf' : 'application/x-netcdf',
'.cpio' : 'application/x-cpio',
'.csh' : 'application/x-csh',
'.css' : 'text/css',
'.dll' : 'application/octet-stream',
'.doc' : 'application/msword',
'.dot' : 'application/msword',
'.dvi' : 'application/x-dvi',
'.eml' : 'message/rfc822',
'.eps' : 'application/postscript',
'.etx' : 'text/x-setext',
'.exe' : 'application/octet-stream',
'.gif' : 'image/gif',
'.gtar' : 'application/x-gtar',
'.h' : 'text/plain',
'.hdf' : 'application/x-hdf',
'.htm' : 'text/html',
'.html' : 'text/html',
'.ief' : 'image/ief',
'.jpe' : 'image/jpeg',
'.jpeg' : 'image/jpeg',
'.jpg' : 'image/jpeg',
'.js' : 'application/x-javascript',
'.ksh' : 'text/plain',
'.latex' : 'application/x-latex',
'.m1v' : 'video/mpeg',
'.man' : 'application/x-troff-man',
'.me' : 'application/x-troff-me',
'.mht' : 'message/rfc822',
'.mhtml' : 'message/rfc822',
'.mif' : 'application/x-mif',
'.mov' : 'video/quicktime',
'.movie' : 'video/x-sgi-movie',
'.mp2' : 'audio/mpeg',
'.mp3' : 'audio/mpeg',
'.mpa' : 'video/mpeg',
'.mpe' : 'video/mpeg',
'.mpeg' : 'video/mpeg',
'.mpg' : 'video/mpeg',
'.ms' : 'application/x-troff-ms',
'.nc' : 'application/x-netcdf',
'.nws' : 'message/rfc822',
'.o' : 'application/octet-stream',
'.obj' : 'application/octet-stream',
'.oda' : 'application/oda',
'.p12' : 'application/x-pkcs12',
'.p7c' : 'application/pkcs7-mime',
'.pbm' : 'image/x-portable-bitmap',
'.pdf' : 'application/pdf',
'.pfx' : 'application/x-pkcs12',
'.pgm' : 'image/x-portable-graymap',
'.pl' : 'text/plain',
'.png' : 'image/png',
'.pnm' : 'image/x-portable-anymap',
'.pot' : 'application/vnd.ms-powerpoint',
'.ppa' : 'application/vnd.ms-powerpoint',
'.ppm' : 'image/x-portable-pixmap',
'.pps' : 'application/vnd.ms-powerpoint',
'.ppt' : 'application/vnd.ms-powerpoint',
'.ps' : 'application/postscript',
'.pwz' : 'application/vnd.ms-powerpoint',
'.py' : 'text/x-python',
'.pyc' : 'application/x-python-code',
'.pyo' : 'application/x-python-code',
'.qt' : 'video/quicktime',
'.ra' : 'audio/x-pn-realaudio',
'.ram' : 'application/x-pn-realaudio',
'.ras' : 'image/x-cmu-raster',
'.rdf' : 'application/xml',
'.rgb' : 'image/x-rgb',
'.roff' : 'application/x-troff',
'.rtx' : 'text/richtext',
'.sgm' : 'text/x-sgml',
'.sgml' : 'text/x-sgml',
'.sh' : 'application/x-sh',
'.shar' : 'application/x-shar',
'.snd' : 'audio/basic',
'.so' : 'application/octet-stream',
'.src' : 'application/x-wais-source',
'.sv4cpio': 'application/x-sv4cpio',
'.sv4crc' : 'application/x-sv4crc',
'.swf' : 'application/x-shockwave-flash',
'.t' : 'application/x-troff',
'.tar' : 'application/x-tar',
'.tcl' : 'application/x-tcl',
'.tex' : 'application/x-tex',
'.texi' : 'application/x-texinfo',
'.texinfo': 'application/x-texinfo',
'.tif' : 'image/tiff',
'.tiff' : 'image/tiff',
'.tr' : 'application/x-troff',
'.tsv' : 'text/tab-separated-values',
'.txt' : 'text/plain',
'.ustar' : 'application/x-ustar',
'.vcf' : 'text/x-vcard',
'.wav' : 'audio/x-wav',
'.wiz' : 'application/msword',
'.wsdl' : 'application/xml',
'.xbm' : 'image/x-xbitmap',
'.xlb' : 'application/vnd.ms-excel',
'.xls' : 'application/excel',
'.xls' : 'application/vnd.ms-excel',
'.xml' : 'text/xml',
'.xpdl' : 'application/xml',
'.xpm' : 'image/x-xpixmap',
'.xsl' : 'application/xml',
'.xwd' : 'image/x-xwindowdump',
'.zip' : 'application/zip',