The form of enctype = "multipart/form-Data" cannot obtain commons-fileupload, a parameter other than type = file in the form, except for file.

You will find that after the form of enctype = "multipart/form-Data" is submitted, other parameters cannot be obtained using the traditional request. getparameter in the background.

I personally understand that every parameter is processed in the form of a stream and can be obtained only in a special way.

This document uses commons-fileupload to obtain parameters other than file.

HtmlCode:

   <  Form  ID  = "Uploadfileform"  Action  = "Uploadservlet"  Target  = "Hiddenframe"  Method  = "Post" Enctype  = "Multipart/form-Data"  >  
  <  Input  ID  = "Fileinput"  Type  = "File"  Onchange  = "Uploadfile ();"  Name  = "Upload"     >  
 <  Input  Type  = "Hidden"  Value  = "/Image /"  Name  = "Directory"  >  
  </  Form  > 

Servlet code:

 Package  Ui. filemanage;

  Import Java. Io. file;
  Import  Java. Io. ioexception;
  Import  Java. Io. inputstream;
  Import  Java. util. iterator;
  Import  Java. util. List;
  Import  Javax. servlet. servletexception;
  Import  Javax. servlet. http. httpservlet;
  Import Javax. servlet. http. httpservletrequest;
  Import  Javax. servlet. http. httpservletresponse;
  Import  Org. Apache. commons. fileupload. fileitem;
  Import  Org. Apache. commons. fileupload. disk. diskfileitemfactory;
  Import  Org. Apache. commons. fileupload. servlet. servletfileupload;

  Public     Class  Uploadservlet Extends  Httpservlet {

@ Suppresswarnings (  "  Unchecked  "  )
  Public     Void  Dopost (httpservletrequest request, httpservletresponse response)
  Throws  Servletexception, ioexception {
Response. setcontenttype (  "  Text/html; charsets = UTF-8 "  );
String errormessage  =     Null  ;
  Try  {
Diskfileitemfactory fac  =     New  Diskfileitemfactory ();
Servletfileupload upload  =     New Servletfileupload (FAC );
Upload. setheaderencoding (  "  UTF-8  "  );
List filelist  =     Null  ;
Filelist  =  Upload. parserequest (request );

String dir  =  (Fileitem) filelist. Get (  1 ). Getstring ();  //  Get directory Parameters  
    If  (Dir  =     Null  ){
Dir  =     "  /  " ;
}
String savepath  =  Getservletcontext (). getrealpath (  "  /Test  "     +  DIR );
System. Out. println (  "  Save:  "     +  Savepath );
File F1  =    New  File (savepath );
  If  (  !  F1.exists ()){
F1.mkdirs ();
}

Iterator  <  Fileitem  >  It  =  Filelist. iterator ();
String name  =    ""  ;
  While  (It. hasnext ()){
Fileitem  =  It. Next ();
  If  (  !  Item. isformfield ()){
Name  =  Item. getname ();
File  =     New File (savepath  +  File. separatorchar  +  Name );
  If  (File. exists ()){
Errormessage  =     "  This file already exists! Rename and upload again.  "  ;
}
Item. Write (File );
Item. Delete ();  // Release output stream  
  }
}
  If  (Errormessage  =     Null  ){
Response. getwriter (). Print (  "  <SCRIPT> parent. finishuploading (1); </SCRIPT>  "  );
}  Else {
Response. getwriter (). Print (  "  <SCRIPT> parent. finishuploading (0 ,'  "     +  Errormessage  +     "  '); </SCRIPT>  "  );
}
}  Catch  (Exception ){
Response. getwriter (). Print ( "  <SCRIPT> parent. finishuploading (0, 'Upload Failed. Please try again. '); </SCRIPT>  "  );
}
}
}