File manipulation !!!

[mia]

hi all ..

actually my requirment is to read a user selected file ( csv) .. do some operation and write the results into a new file to the server ...

can any one help me how to do this ..

any help will be greatly appreciated ...

thanx in advance ...

[Rod Johnson]

This is really a general programming question rather than a Spring question. You might want to look for file manipulation libraries.

[mia]

thanks for the reply ...

actually i think some uploading of file is required before programming with libraries ..

my quiestion is whether i need to physically copy the file to server side before doing some file operations on it ...

or what to do in such a situation ...?

sorry for my bad english

thanx again

[qman]

<!—test.jsp >
<FORM name='person' method="POST" enctype="multipart/form-data" >
<table>
<tr>
<th width='20%' align='right'>Import File</th>
<td>
<input type="file" name="importFile">
</td></tr>
</table>
</form>



/**
* TestForm.java
*/


import org.apache.commons.fileupload.* ;

public class TestForm extends SimpleFormController {

/** Method used to search for owners renders View depending on how many are found */
protected ModelAndView onSubmit(
HttpServletRequest request, HttpServletResponse response, Object command, BindException errors)
throws Exception {


// Create a new file upload handler
DiskFileUpload upload = new DiskFileUpload();

// Parse the request
List /* FileItem */ items = upload.parseRequest(request);
// Process the uploaded items
Iterator iter = items.iterator();
while (iter.hasNext()) {
FileItem item = (FileItem) iter.next();
logger.info("importFile name=" + item.getFieldName());
if("importFile".equals(item.getFieldName())){
logger.info("importFile=" + item.getName());
readFileContents(item);
break;
}
}

return new ModelAndView(new RedirectView("home.htm"));
}

/**
* read the content of import file
*
* @throws IOException
*/
public void readFileContents(FileItem item ) throws IOException {
//File file = new File(fileName);

String thisLine;
StringBuffer content = new StringBuffer();
String filecontents = "";

//
//logger.info("file exist .." + fileName);
InputStream fin = item.getInputStream();

//JDK1.1+
BufferedReader myInput = new BufferedReader
(new InputStreamReader(fin));
// JDK1.02
// DataInputStream myInput = new DataInputStream(fin);
while ((thisLine = myInput.readLine()) != null) {
//thisLine = doStringReplace(thisLine);
logger.info("thisLine =" + thisLine);
content.append(thisLine);
content.append("\n");
}
fin.close();

//logger.info("file content =\n" + content);
}
}

[cglenn]

I have a form that combines input type=file and type=text elements. When I try to do typical request.getParameter calls, I get nulls back on items that work when the form enctype is default...

[qman]

I have a form that combines input type=file and type=text elements. When I try to do typical request.getParameter calls, I get nulls back on items that work when the form enctype is default...

i got the same problem. i use
fileitem.getString()
to get the values

for complex form and database processing, i prefer Struts forms and direct jdbc satatement