struts2文件上传如何限制上传文件类型(类型列表)
StarStream 的 struts2文件上传如何限制上传文件类型(类型列表)
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 xxxContentType;
????private?String xxxFileName;
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',
?
很好
