Web Application for File Upload with streaming

This gives you an entire working example (worth 1000 user manual pages) http://www.codejava.net/java-ee/servlet/apache-commons-fileupload-example-with-servlet-and-jsp .... I have tested it and put in https://github.com/vernetto/WebFileUploader (just git clone it and run it).

Here the user guide of Apache FileUpload module:

http://commons.apache.org/proper/commons-fileupload/using.html

Create a webapp

Download commons-io jar http://commons.apache.org/proper/commons-io/download_io.cgi and commons-fileupload jar http://commons.apache.org/proper/commons-fileupload/download_fileupload.cgi and place them in WEB-INF/lib

Well actually rather than putting here snippets of code, here is the whole NON-Streaming example https://github.com/vernetto/WebFileUploader and here the STREAMING example https://github.com/vernetto/WebFileUploaderStreaming

I have tested with a 4GB file and memory occupation on the server (and Garbage Collection) was really minimal... transfer speed was also decent (say 2 minutes for a 4GB file....).

Here https://raw.githubusercontent.com/vernetto/WebFileUploaderStreaming/master/WebFileUploaderStreaming.war you can download the war file directly.

Struts File Upload

http://wiki.apache.org/struts/StrutsFileUpload

in a nutshell:


in the JSP:

in the Action:

ProductUploadForm myForm = (ProductUploadForm) form;
SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");



// Process the FormFile
FormFile myFile = myForm.getTheFile();
String contentType = myFile.getContentType();
String fileNameAbsolutePath    = myFile.getFileName();
int fileSize       = myFile.getFileSize();

logger.debug("uploading File Name: " + fileNameAbsolutePath + ", File Size: " + fileSize + ", contentType: " + contentType);
String fileName = new File(fileNameAbsolutePath).getName();
String newFileName = STAGING_DIR + fileName + sdf.format(new Date());

try {
 // copy the stream content to a File in a staging directory, adding timestamp to the file name
 File f2 = new File(newFileName);
 OutputStream out = new FileOutputStream(f2);
 InputStream in = myFile.getInputStream();
 byte[] buf = new byte[1024];

 int len;

 while ((len = in.read(buf)) > 0){
  out.write(buf, 0, len);
 }
 in.close();
 out.close();
 logger.debug("finished copying File Name: " + fileNameAbsolutePath);
} catch (Exception e) {
 logger.error("problem uploading file name : " + fileNameAbsolutePath, e);
}

and the Form contains an attribute
private org.apache.struts.upload.FormFile theFile;

with getter and setter