205 lines
7.5 KiB
Java
205 lines
7.5 KiB
Java
/*
|
|
* Licensed to the Apache Software Foundation (ASF) under one or more
|
|
* contributor license agreements. See the NOTICE file distributed with
|
|
* this work for additional information regarding copyright ownership.
|
|
* The ASF licenses this file to You under the Apache License, Version 2.0
|
|
* (the "License"); you may not use this file except in compliance with
|
|
* the License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*/
|
|
package org.apache.commons.fileupload;
|
|
|
|
import java.io.File;
|
|
import java.io.IOException;
|
|
import java.io.InputStream;
|
|
import java.io.OutputStream;
|
|
import java.io.UnsupportedEncodingException;
|
|
|
|
/**
|
|
* <p> This class represents a file or form item that was received within a
|
|
* <code>multipart/form-data</code> POST request.
|
|
*
|
|
* <p> After retrieving an instance of this class from a {@link
|
|
* org.apache.commons.fileupload.FileUpload FileUpload} instance (see
|
|
* {@link org.apache.commons.fileupload.servlet.ServletFileUpload
|
|
* #parseRequest(jakarta.servlet.http.HttpServletRequest)}), you may
|
|
* either request all contents of the file at once using {@link #get()} or
|
|
* request an {@link java.io.InputStream InputStream} with
|
|
* {@link #getInputStream()} and process the file without attempting to load
|
|
* it into memory, which may come handy with large files.
|
|
*
|
|
* <p> While this interface does not extend
|
|
* <code>javax.activation.DataSource</code> per se (to avoid a seldom used
|
|
* dependency), several of the defined methods are specifically defined with
|
|
* the same signatures as methods in that interface. This allows an
|
|
* implementation of this interface to also implement
|
|
* <code>javax.activation.DataSource</code> with minimal additional work.
|
|
*
|
|
* @since 1.3 additionally implements FileItemHeadersSupport
|
|
*/
|
|
public interface FileItem extends FileItemHeadersSupport {
|
|
|
|
// ------------------------------- Methods from javax.activation.DataSource
|
|
|
|
/**
|
|
* Returns an {@link java.io.InputStream InputStream} that can be
|
|
* used to retrieve the contents of the file.
|
|
*
|
|
* @return An {@link java.io.InputStream InputStream} that can be
|
|
* used to retrieve the contents of the file.
|
|
*
|
|
* @throws IOException if an error occurs.
|
|
*/
|
|
InputStream getInputStream() throws IOException;
|
|
|
|
/**
|
|
* Returns the content type passed by the browser or <code>null</code> if
|
|
* not defined.
|
|
*
|
|
* @return The content type passed by the browser or <code>null</code> if
|
|
* not defined.
|
|
*/
|
|
String getContentType();
|
|
|
|
/**
|
|
* Returns the original filename in the client's filesystem, as provided by
|
|
* the browser (or other client software). In most cases, this will be the
|
|
* base file name, without path information. However, some clients, such as
|
|
* the Opera browser, do include path information.
|
|
*
|
|
* @return The original filename in the client's filesystem.
|
|
* @throws InvalidFileNameException The file name contains a NUL character,
|
|
* which might be an indicator of a security attack. If you intend to
|
|
* use the file name anyways, catch the exception and use
|
|
* InvalidFileNameException#getName().
|
|
*/
|
|
String getName();
|
|
|
|
// ------------------------------------------------------- FileItem methods
|
|
|
|
/**
|
|
* Provides a hint as to whether or not the file contents will be read
|
|
* from memory.
|
|
*
|
|
* @return <code>true</code> if the file contents will be read from memory;
|
|
* <code>false</code> otherwise.
|
|
*/
|
|
boolean isInMemory();
|
|
|
|
/**
|
|
* Returns the size of the file item.
|
|
*
|
|
* @return The size of the file item, in bytes.
|
|
*/
|
|
long getSize();
|
|
|
|
/**
|
|
* Returns the contents of the file item as an array of bytes.
|
|
*
|
|
* @return The contents of the file item as an array of bytes.
|
|
*/
|
|
byte[] get();
|
|
|
|
/**
|
|
* Returns the contents of the file item as a String, using the specified
|
|
* encoding. This method uses {@link #get()} to retrieve the
|
|
* contents of the item.
|
|
*
|
|
* @param encoding The character encoding to use.
|
|
*
|
|
* @return The contents of the item, as a string.
|
|
*
|
|
* @throws UnsupportedEncodingException if the requested character
|
|
* encoding is not available.
|
|
*/
|
|
String getString(String encoding) throws UnsupportedEncodingException;
|
|
|
|
/**
|
|
* Returns the contents of the file item as a String, using the default
|
|
* character encoding. This method uses {@link #get()} to retrieve the
|
|
* contents of the item.
|
|
*
|
|
* @return The contents of the item, as a string.
|
|
*/
|
|
String getString();
|
|
|
|
/**
|
|
* A convenience method to write an uploaded item to disk. The client code
|
|
* is not concerned with whether or not the item is stored in memory, or on
|
|
* disk in a temporary location. They just want to write the uploaded item
|
|
* to a file.
|
|
* <p>
|
|
* This method is not guaranteed to succeed if called more than once for
|
|
* the same item. This allows a particular implementation to use, for
|
|
* example, file renaming, where possible, rather than copying all of the
|
|
* underlying data, thus gaining a significant performance benefit.
|
|
*
|
|
* @param file The <code>File</code> into which the uploaded item should
|
|
* be stored.
|
|
*
|
|
* @throws Exception if an error occurs.
|
|
*/
|
|
void write(File file) throws Exception;
|
|
|
|
/**
|
|
* Deletes the underlying storage for a file item, including deleting any
|
|
* associated temporary disk file. Although this storage will be deleted
|
|
* automatically when the <code>FileItem</code> instance is garbage
|
|
* collected, this method can be used to ensure that this is done at an
|
|
* earlier time, thus preserving system resources.
|
|
*/
|
|
void delete();
|
|
|
|
/**
|
|
* Returns the name of the field in the multipart form corresponding to
|
|
* this file item.
|
|
*
|
|
* @return The name of the form field.
|
|
*/
|
|
String getFieldName();
|
|
|
|
/**
|
|
* Sets the field name used to reference this file item.
|
|
*
|
|
* @param name The name of the form field.
|
|
*/
|
|
void setFieldName(String name);
|
|
|
|
/**
|
|
* Determines whether or not a <code>FileItem</code> instance represents
|
|
* a simple form field.
|
|
*
|
|
* @return <code>true</code> if the instance represents a simple form
|
|
* field; <code>false</code> if it represents an uploaded file.
|
|
*/
|
|
boolean isFormField();
|
|
|
|
/**
|
|
* Specifies whether or not a <code>FileItem</code> instance represents
|
|
* a simple form field.
|
|
*
|
|
* @param state <code>true</code> if the instance represents a simple form
|
|
* field; <code>false</code> if it represents an uploaded file.
|
|
*/
|
|
void setFormField(boolean state);
|
|
|
|
/**
|
|
* Returns an {@link java.io.OutputStream OutputStream} that can
|
|
* be used for storing the contents of the file.
|
|
*
|
|
* @return An {@link java.io.OutputStream OutputStream} that can be used
|
|
* for storing the contensts of the file.
|
|
*
|
|
* @throws IOException if an error occurs.
|
|
*/
|
|
OutputStream getOutputStream() throws IOException;
|
|
|
|
}
|