Struts2 Study Notes (10): File Upload

Step 1: WEB-INF/lib Add below Commons-fileupload-1.2.1.jar , Commons-io-1.3.2.jar . These two files can be Http://commons.apache.org/ Download. Step 2: Form Table Enctype Set: " Multipart/form-Data " , As follows: <Form enctype = "multipart/form-Data" Action = "$ {pagecontext. request. contextpath}/xxx. action "method =" Post "> <input type =" file "name =" Uploadimage "> </Form> Step 3: Action Class to add the following attributes :

 Public   Class Helloworldaction {
 Private File uploadimage; //  Get the uploaded file  
      Private String uploadimagecontenttype; //  Obtain the file type.  
      Private String uploadimagefilename;//  Get the file name
  //  The getter/setter method of the attribute is omitted here.  
      Public String upload () Throws Exception {
String realpath = servletactioncontext. getservletcontext (). getrealpath ("/images ");
File file = New File (realpath );
 If (! File. exists () file. mkdirs ();
Fileutils. copyfile (uploadimage, New File (file, uploadimagefilename ));
 Return "Success ";
}
}

Multi-File Upload Step 1: WEB-INF/lib Add below Commons-fileupload-1.2.1.jar , Commons-io-1.3.2.jar . These two files can be Http://commons.apache.org/ Download.
Step 2: Form Table Enctype Set: " Multipart/form-Data " , As follows: <Form enctype = "multipart/form-Data" Action = "$ {pagecontext. request. contextpath}/xxx. action "method =" Post "> <input type =" file "name =" Uploadimages "> <Input type =" file "name =" Uploadimages "> </Form> Step 3: Action Class, The red part of the attribute corresponds to the name of the file field in the form. :

 Public   Class Helloworldaction {
 Private File [] uploadimages;//  Get the uploaded file  
      Private String [] uploadimagescontenttype; //  Obtain the file type.  
      Private String [] uploadimagesfilename; //  Get the file name
  //  The getter/setter method of the attribute is omitted here.  
      Public String upload () Throws Exception {
String realpath = servletactioncontext. getservletcontext (). getrealpath ("/images ");
File file = New File (realpath );
 If (! File. exists () file. mkdirs ();
 For ( Int I = 0; I <uploadimages. length; I ++) {file uploadimage = uploadimages [I];
Fileutils. copyfile (uploadimage, New File (file, uploadimagesfilename [I]);
}
 Return "Success ";
}}