com.silentgo.servlet.oreilly.multipart.FilePart Maven / Gradle / Ivy
// Copyright (C) 1999-2001 by Jason Hunter .
// All rights reserved. Use of this class is limited.
// Please see the LICENSE for more information.
package com.silentgo.servlet.oreilly.multipart;
import java.io.File;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.BufferedOutputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import javax.servlet.ServletInputStream;
/**
* A FilePart is an upload part which represents a
* INPUT TYPE="file" form parameter. Note that because file
* upload data arrives via a single InputStream, each FilePart's contents
* must be read before moving onto the next part. Don't try to store a
* FilePart object for later processing because by then their content will
* have been passed by.
*
* @author Geoff Soutter
* @version 1.2, 2001/01/22, getFilePath() addition thanks to Stefan Eissing
* @version 1.1, 2000/11/26, writeTo() bug fix thanks to Mike Shivas
* @version 1.0, 2000/10/27, initial revision
*/
public class FilePart extends Part {
/** "file system" name of the file */
private String fileName;
/** path of the file as sent in the request, if given */
private String filePath;
/** content type of the file */
private String contentType;
/** input stream containing file data */
private PartInputStream partInput;
/** file rename policy */
private FileRenamePolicy policy;
/**
* Construct a file part; this is called by the parser.
*
* @param name the name of the parameter.
* @param in the servlet input stream to read the file from.
* @param boundary the MIME boundary that delimits the end of file.
* @param contentType the content type of the file provided in the
* MIME header.
* @param fileName the file system name of the file provided in the
* MIME header.
* @param filePath the file system path of the file provided in the
* MIME header (as specified in disposition info).
*
* @exception IOException if an input or output exception has occurred.
*/
FilePart(String name, ServletInputStream in, String boundary,
String contentType, String fileName, String filePath)
throws IOException {
super(name);
this.fileName = fileName;
this.filePath = filePath;
this.contentType = contentType;
partInput = new PartInputStream(in, boundary);
}
/**
* Puts in place the specified policy for handling file name collisions.
*/
public void setRenamePolicy(FileRenamePolicy policy) {
this.policy = policy;
}
/**
* Returns the name that the file was stored with on the remote system,
* or null if the user didn't enter a file to be uploaded.
* Note: this is not the same as the name of the form parameter used to
* transmit the file; that is available from the getName
* method. Further note: if file rename logic is in effect, the file
* name can change during the writeTo() method when there's a collision
* with another file of the same name in the same directory. If this
* matters to you, be sure to pay attention to when you call the method.
*
* @return name of file uploaded or null.
*
* @see Part#getName()
*/
public String getFileName() {
return fileName;
}
/**
* Returns the full path and name of the file on the remote system,
* or null if the user didn't enter a file to be uploaded.
* If path information was not supplied by the remote system, this method
* will return the same as getFileName().
*
* @return path of file uploaded or null.
*
* @see Part#getName()
*/
public String getFilePath() {
return filePath;
}
/**
* Returns the content type of the file data contained within.
*
* @return content type of the file data.
*/
public String getContentType() {
return contentType;
}
/**
* Returns an input stream which contains the contents of the
* file supplied. If the user didn't enter a file to upload
* there will be 0 bytes in the input stream.
* It's important to read the contents of the InputStream
* immediately and in full before proceeding to process the
* next part. The contents will otherwise be lost on moving
* to the next part.
*
* @return an input stream containing contents of file.
*/
public InputStream getInputStream() {
return partInput;
}
/**
* Write this file part to a file or directory. If the user
* supplied a file, we write it to that file, and if they supplied
* a directory, we write it to that directory with the filename
* that accompanied it. If this part doesn't contain a file this
* method does nothing.
*
* @return number of bytes written
* @exception IOException if an input or output exception has occurred.
*/
public long writeTo(File fileOrDirectory) throws IOException {
long written = 0;
OutputStream fileOut = null;
try {
// Only do something if this part contains a file
if (fileName != null) {
// Check if user supplied directory
File file;
if (fileOrDirectory.isDirectory()) {
// Write it to that dir the user supplied,
// with the filename it arrived with
file = new File(fileOrDirectory, fileName);
}
else {
// Write it to the file the user supplied,
// ignoring the filename it arrived with
file = fileOrDirectory;
}
if (policy != null) {
file = policy.rename(file);
fileName = file.getName();
}
fileOut = new BufferedOutputStream(new FileOutputStream(file));
written = write(fileOut);
}
}
finally {
if (fileOut != null) fileOut.close();
}
return written;
}
/**
* Write this file part to the given output stream. If this part doesn't
* contain a file this method does nothing.
*
* @return number of bytes written.
* @exception IOException if an input or output exception has occurred.
*/
public long writeTo(OutputStream out) throws IOException {
long size=0;
// Only do something if this part contains a file
if (fileName != null) {
// Write it out
size = write( out );
}
return size;
}
/**
* Internal method to write this file part; doesn't check to see
* if it has contents first.
*
* @return number of bytes written.
* @exception IOException if an input or output exception has occurred.
*/
long write(OutputStream out) throws IOException {
// decode macbinary if this was sent
if (contentType.equals("application/x-macbinary")) {
out = new MacBinaryDecoderOutputStream(out);
}
long size=0;
int read;
byte[] buf = new byte[8 * 1024];
while((read = partInput.read(buf)) != -1) {
out.write(buf, 0, read);
size += read;
}
return size;
}
/**
* Returns true to indicate this part is a file.
*
* @return true.
*/
public boolean isFile() {
return true;
}
}