org.jorigin.io.IOStreamUtil Maven / Gradle / Ivy
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A java common package that enable to deal with various functionalities
/*
This file is part of JOrigin Common Library.
JOrigin Common is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
JOrigin Common is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with JOrigin Common. If not, see uri. The returned stream can be:
*
* - a {@link java.io.FileInputStream} if the resource is a file on a local system;
*
- a {@link java.io.BufferedInputStream} if the resource is an
url or a location on a remote system;
*
* @param uri the location of the resource
* @return the input stream opened to the resource
* @throws IOException if an error occurs.
*/
public static InputStream getInputStream(String uri) throws IOException {
InputStream is = null;
URL url = null;
File file = null;
switch (PathUtil.getProtocol(uri)) {
case PathUtil.SYSTEM:
file = new File(uri);
if (file.exists()) {
try {
is = new FileInputStream(file);
} catch (FileNotFoundException ex) {
is = null;
throw new IOException(ex.getMessage());
}
} else {
is = null;
throw new IOException("File " + file.getPath() + " does not exist");
}
break;
case PathUtil.URL_FILE:
file = new File(PathUtil.URIToPath(uri));
if (file.exists()) {
try {
file = new File(PathUtil.URIToPath(uri));
is = new FileInputStream(file);
} catch (FileNotFoundException ex) {
is = null;
throw new IOException(ex.getMessage());
}
} else {
is = null;
throw new IOException("File " + file.getPath() + " does not exist");
}
break;
case PathUtil.URL_FTP:
try {
url = new URL(uri);
is = new BufferedInputStream(url.openStream());
} catch (MalformedURLException ex) {
is = null;
throw new IOException(ex.getMessage());
} catch (IOException ex) {
is = null;
throw new IOException(ex.getMessage());
}
break;
case PathUtil.URL_HTTP:
try {
url = new URL(uri);
//HttpURLConnection connection = (HttpURLConnection) url.openConnection();
is =url.openStream();
} catch (MalformedURLException ex) {
is = null;
throw new IOException(ex.getMessage());
} catch (IOException ex) {
is = null;
throw new IOException(ex.getMessage());
}
break;
default:
is = null;
throw new IOException("Cannot determine protocol used by "+uri);
}
return is;
}
/**
* Get a buffered input stream from the uri given in parameter.
* @param uri the uri source of the input stream.
* @return a buffered input stream.
* @throws IOException if the stream cannot be set up.
*/
public static BufferedInputStream getBufferedInputStream(String uri)
throws IOException {
return getBufferedInputStream(uri, -1);
}
/**
* Get a buffered input stream from the uri given in parameter. The input stream
* buffer size is given by the bufferSize parameter. If the buffer size is less than 1,
* the buffered input stream created have a default buffer size.
* @param uri the uri source of the input stream.
* @param bufferSize the size of the buffer
* @return a buffered input stream.
* @throws IOException if the stream cannot be set up.
*/
public static BufferedInputStream getBufferedInputStream(String uri, int bufferSize)
throws IOException {
BufferedInputStream bis = null;
try {
if (bufferSize > 0){
bis = new BufferedInputStream(getInputStream(uri), bufferSize);
} else {
bis = new BufferedInputStream(getInputStream(uri));
}
} catch (IOException e) {
bis = null;
}
if (bis == null) {
throw new IOException("Cannot create a buffered input stream for " + uri);
}
return bis;
}
/**
* Get an output stream to the uri given in parameter.
* @param uri the uri of the resource outputed
* @return an output stream to the resource.
* @throws IOException if the output stream cannot be set up.
*/
public static OutputStream getOutputStream(String uri) throws IOException {
OutputStream os = null;
File file = null;
switch (PathUtil.getProtocol(uri)) {
// L'uri pointe une ressource système
case PathUtil.SYSTEM:
try {
file = new File(uri);
if (!file.exists()) {
if (file.getParentFile() != null){
file.getParentFile().mkdirs();
}
file.createNewFile();
}
os = new FileOutputStream(file);
} catch (FileNotFoundException ex) {
os = null;
throw new IOException(ex.getMessage());
}
break;
// L'uri pointe vers un url locale
case PathUtil.URL_FILE:
try {
file = new File(PathUtil.URIToPath(uri));
// System.err.println("[IOStreamUtil] getOutputStream():
// "+PathUtil.URIToPath(uri));
if (!file.exists()) {
if (file.getParentFile() != null){
file.getParentFile().mkdirs();
}
file.createNewFile();
}
os = new FileOutputStream(file);
} catch (FileNotFoundException ex) {
os = null;
throw new IOException(ex.getMessage());
}
break;
// L'uri pointe une ressource FTP
case PathUtil.URL_FTP:
System.err.println("[IOStreamUtil] FTP output not yet implemented");
os = null;
throw new IOException("Protocol FTP not implemented "+uri);
// L'uri pointe une ressource HTTP
case PathUtil.URL_HTTP:
System.err.println("[IOStreamUtil] HTTP output not yet implemented");
os = null;
throw new IOException("Protocol HTTP not implemented "+uri);
default:
os = null;
throw new IOException("Cannot determine protocol used by "+uri);
}
return os;
}
/**
* Get a buffered output stream to the uri given in parameter.
* @param uri the uri source of the output stream.
* @return a buffered output stream.
* @throws IOException if the stream cannot be set up.
* @see #getBufferedOutputStream(String, int)
*/
public static BufferedOutputStream getBufferedOutputStream(String uri)
throws IOException {
return getBufferedOutputStream(uri, -1);
}
/**
* Get a buffered output stream to the uri given in parameter. The output stream
* buffer size is given by the bufferSize parameter. If the buffer size is less than 1,
* the buffered output stream created have a default buffer size.
* @param uri the uri source of the output stream.
* @param bufferSize the size of the buffer
* @return a buffered output stream.
* @throws IOException if the stream cannot be set up.
*/
public static BufferedOutputStream getBufferedOutputStream(String uri, int bufferSize)
throws IOException {
BufferedOutputStream bos = null;
try {
if (bufferSize > 0){
bos = new BufferedOutputStream(getOutputStream(uri), bufferSize);
} else {
bos = new BufferedOutputStream(getOutputStream(uri));
}
} catch (IOException e) {
bos = null;
}
if (bos == null) {
throw new IOException("Cannot create a buffered output stream for " + uri);
}
return bos;
}
/**
* Simple copy of an input stream to an output stream.
*
* @param source
* Input stream to the source
* @param destination
* Output stream to the destination
* @return true if the copy was successfull, false if not
*/
public static boolean copy(InputStream source, OutputStream destination) {
boolean result = false;
try {
// Lecture par segment de 0.5M
byte buffer[] = new byte[1024];
int nbLecture;
while ((nbLecture = source.read(buffer)) != -1) {
destination.write(buffer, 0, nbLecture);
}
// Copie reussie
result = true;
} catch (java.io.FileNotFoundException f) {
System.err.println(f);
result = false;
} catch (java.io.IOException e) {
System.err.println(e);
result = false;
} finally {
/* Quoi qu'il arrive, on ferme les flux */
try {
source.close();
} catch (Exception e) {
}
try {
destination.close();
} catch (Exception e) {
}
}
return (result);
}
}
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