Implementing file uploads using a servlet

1  PackageCom.zhanghaobo.fileupload;2 3 ImportJava.io.File;4 Importjava.io.IOException;5 Importjava.util.List;6 7 Importjavax.servlet.ServletException;8 ImportJavax.servlet.http.HttpServlet;9 Importjavax.servlet.http.HttpServletRequest;Ten ImportJavax.servlet.http.HttpServletResponse; One  A ImportOrg.apache.commons.fileupload.FileItem; - Importorg.apache.commons.fileupload.disk.DiskFileItemFactory; - ImportOrg.apache.commons.fileupload.servlet.ServletFileUpload; the  -  Public classUploadservletextendsHttpServlet { - @Override -     protected voidDoPost (httpservletrequest req, HttpServletResponse resp) +             throwsservletexception, IOException { -Diskfileitemfactory factory=Newdiskfileitemfactory (); +          AString Realpath=req.getrealpath ("/upload"); at          -         //Physical Cache storage location -Factory.setrepository (NewFile (Realpath)); -          -         //set Memory storage size -Factory.setsizethreshold (1024*1024); in          -Servletfileupload upload=Newservletfileupload (factory); to         //Fileitem can indicate that a file or a text field (form Item) has a Isformfield method to determine whether the form +         Try{ -List<fileitem> list= (list<fileitem>) upload.parserequest (req); the              for(Fileitem item:list) { *String name=item.getfieldname (); $                 if(Item.isformfield ()) {Panax NotoginsengString value=item.getstring (); - Req.setattribute (name, value); the}Else{ +String value=item.getname (); A                     intStart=value.lastindexof ("\ \"); theString filename=value.substring (start+1); + Req.setattribute (name, fileName); -                     //upload a file to the repository $Item.write (NewFile (Realpath,filename)); $                 } -             } -}Catch(Exception e) { the e.printstacktrace (); -         }Wuyi          theReq.getrequestdispatcher ("showresult.jsp"). Forward (req, resp); -     } Wu}

1  Public classUploadservletextendsHttpServlet {2 @Override3     protected voidDoPost (httpservletrequest req, HttpServletResponse resp)4             throwsservletexception, IOException {5Diskfileitemfactory factory=Newdiskfileitemfactory ();6         7String Realpath=req.getrealpath ("/upload");8         9         //Physical Cache storage locationTenFactory.setrepository (NewFile (Realpath)); One          A         //set Memory storage size -Factory.setsizethreshold (1024*1024); -          theServletfileupload upload=Newservletfileupload (factory); -         //Fileitem can indicate that a file or a text field (form Item) has a Isformfield method to determine whether the form -         Try{ -List<fileitem> list= (list<fileitem>) upload.parserequest (req); +              for(Fileitem item:list) { -String name=item.getfieldname (); +                 if(Item.isformfield ()) { AString value=item.getstring (); at Req.setattribute (name, value); -}Else{ -String value=item.getname (); -                     intStart=value.lastindexof ("\ \"); -String filename=value.substring (start+1); - Req.setattribute (name, fileName); in                      -                     //upload a file to the repository to //Item.write (New File (Realpath,filename)); +                      -InputStream is=Item.getinputstream (); the                      *                     LongAll=item.getsize (); $                     Panax NotoginsengOutputStream os=NewFileOutputStream (NewFile (Realpath,filename)); -                      the                     byte[] buffer=New byte[400]; +                      A                     intLength=0; the                     intL=0; +DecimalFormat df=NewDecimalFormat ("#.00"); -                      while( -1!= (length=is.read (buffer))) { $Os.write (buffer,0, length); $l+=length; -SYSTEM.OUT.PRINTLN ("Total size" +all+ "" + "Progress:" + (Df.format (Double) + l/all*100) + "%" + "size already read" +l); -                     } the                      - is.close ();Wuyi os.close (); the                      -                 } Wu             } -}Catch(Exception e) { About e.printstacktrace (); $         } -          -Req.getrequestdispatcher ("showresult.jsp"). Forward (req, resp); -     } A}

Implementing file uploads using a servlet