does the jsp page receive a file ?
Hi all !
Here is my problem :
I have a jsp page that might be called using two different forms, and only one of them may send a file to upload.
My problem is that I have difficulties to detect if the request contains a file or not.
I use
org.apach.commons.fileupload package
Here my code to upload the file :
DiskFileUpload upload =new DiskFileUpload();
List items = upload.parseRequest(request);
and of course it blocks if there is no file in the request.
How can I check if the request contains a file to upload or not ?
thanks !
Vincent
[667 byte] By [
Vince75] at [2007-9-30 8:09:23]
I hope The method
IsFile() returbs boolean will tell you whether the re\quest has a file or not
URL: http://linux.com.hk/docs/struts/api/org/apache/struts/upload/MultipartElement.html#isFile
The following API will help you solving your problem
java.lang.Object
|
+--org.apache.struts.upload.MultipartElement
--
public class MultipartElement
extends java.lang.Object
This class represents an element in a multipart request. It has a few methods for determining * whether or not the element is a String or a file, and methods to retrieve the data of the aforementioned element. Text input elements have a null content type, files have a non-null content type.
Author:
Mike Schachter
--
Field Summary
protected java.lang.String contentType
The content type of this element.
protected byte[] data
Deprecated. This should never be used.
protected java.io.File file
The element's data represented in a (possibly temporary) file.
protected java.lang.String fileName
The element's filename, null for text elements.
protected boolean isFile
Whether or not this element is a file.
protected java.lang.String name
The element name.
protected java.lang.String value
The element's text value, null for file elements
Constructor Summary
MultipartElement(java.lang.String name, java.lang.String value)
Constructor for a text element.
MultipartElement(java.lang.String name, java.lang.String fileName, java.lang.String contentType, byte[] data)
Deprecated. Use the constructor that takes an File as an argument as opposed to a byte array argument, which can cause memory problems.
MultipartElement(java.lang.String name, java.lang.String fileName, java.lang.String contentType, java.io.File file)
Constructor for a file element.
Method Summary
java.lang.String getContentType()
Retrieve the content type.
byte[] getData()
Deprecated. Use the getFile method to get a File representing the data for this element
java.io.File getFile()
Get the File that holds the data for this element.
java.lang.String getFileName()
Retrieve the filename, can return null for text elements.
java.lang.String getName()
Retrieve the name.
java.lang.String getValue()
Returns the value of this multipart element.
boolean isFile()
Is this element a file.
void setContentType(java.lang.String contentType)
Set the content type.
void setData(byte[] data)
Deprecated. Use the setFile method to set the file that represents the data of this element
void setFile(java.io.File file)
Set the file that represents this element.
void setFileName(java.lang.String fileName)
Set the file name for this element.
void setName(java.lang.String name)
Set the name for this element.
void setValue(java.lang.String value)
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
Field Detail
contentType
protected java.lang.String contentTypeThe content type of this element.
--
data
protected byte[] dataDeprecated. This should never be used.
The element data.
--
file
protected java.io.File fileThe element's data represented in a (possibly temporary) file.
--
name
protected java.lang.String nameThe element name.
--
fileName
protected java.lang.String fileNameThe element's filename, null for text elements.
--
value
protected java.lang.String valueThe element's text value, null for file elements
--
isFile
protected boolean isFileWhether or not this element is a file.
Constructor Detail
MultipartElement
public MultipartElement(java.lang.String name,
java.lang.String fileName,
java.lang.String contentType,
byte[] data)Deprecated. Use the constructor that takes an File as an argument as opposed to a byte array argument, which can cause memory problems.
--
MultipartElement
public MultipartElement(java.lang.String name,
java.lang.String fileName,
java.lang.String contentType,
java.io.File file)Constructor for a file element.
Parameters:
name - The form name of the element
fileName - The file name of the element if this element is a file
contentType - The content type of the element if a file
file - The (possibly temporary) file representing this element if it's a file
--
MultipartElement
public MultipartElement(java.lang.String name,
java.lang.String value)Constructor for a text element.
Parameters:
name - The name of the element
value - The value of the element
Method Detail
getContentType
public java.lang.String getContentType()Retrieve the content type.
--
getData
public byte[] getData()Deprecated. Use the getFile method to get a File representing the data for this element
Retrieve the data.
--
getFile
public java.io.File getFile()Get the File that holds the data for this element.
--
getName
public java.lang.String getName()Retrieve the name.
--
getFileName
public java.lang.String getFileName()Retrieve the filename, can return null for text elements.
--
getValue
public java.lang.String getValue()Returns the value of this multipart element.
Returns:
A String if the element is a text element, null otherwise
--
setFile
public void setFile(java.io.File file)Set the file that represents this element.
--
setFileName
public void setFileName(java.lang.String fileName)Set the file name for this element.
--
setName
public void setName(java.lang.String name)Set the name for this element.
--
setContentType
public void setContentType(java.lang.String contentType)Set the content type.
--
isFile
public boolean isFile()Is this element a file.
--
setValue
public void setValue(java.lang.String value)
--
setData
public void setData(byte[] data)Deprecated. Use the setFile method to set the file that represents the data of this element
Set the data.
ALL THE BEST
