This question already has answers here:
Can you find all classes in a package using reflection?
(30 answers)
Closed 7 years ago.
I need a Class[] of all the class files contained in one of my source packages in Java.
I could n't find a standard method to do it in one shot. If someone can write a function to fetch that list would be really helpful.
Class[] myClasses = yourfunction(); // Return a list of class inside a source package in the currently working project in java
I am able to solve this problem using normal file I/O and search mechanism. You can check the answer as posted here.
private static List<Class> getClassesForPackage(Package pkg) {
String pkgname = pkg.getName();
List<Class> classes = new ArrayList<Class>();
// Get a File object for the package
File directory = null;
String fullPath;
String relPath = pkgname.replace('.', '/');
//System.out.println("ClassDiscovery: Package: " + pkgname + " becomes Path:" + relPath);
URL resource = ClassLoader.getSystemClassLoader().getResource(relPath);
//System.out.println("ClassDiscovery: Resource = " + resource);
if (resource == null) {
throw new RuntimeException("No resource for " + relPath);
}
fullPath = resource.getFile();
//System.out.println("ClassDiscovery: FullPath = " + resource);
try {
directory = new File(resource.toURI());
} catch (URISyntaxException e) {
throw new RuntimeException(pkgname + " (" + resource + ") does not appear to be a valid URL / URI. Strange, since we got it from the system...", e);
} catch (IllegalArgumentException e) {
directory = null;
}
//System.out.println("ClassDiscovery: Directory = " + directory);
if (directory != null && directory.exists()) {
// Get the list of the files contained in the package
String[] files = directory.list();
for (int i = 0; i < files.length; i++) {
// we are only interested in .class files
if (files[i].endsWith(".class")) {
// removes the .class extension
String className = pkgname + '.' + files[i].substring(0, files[i].length() - 6);
//System.out.println("ClassDiscovery: className = " + className);
try {
classes.add(Class.forName(className));
} catch (ClassNotFoundException e) {
throw new RuntimeException("ClassNotFoundException loading " + className);
}
}
}
} else {
try {
String jarPath = fullPath.replaceFirst("[.]jar[!].*", ".jar").replaceFirst("file:", "");
JarFile jarFile = new JarFile(jarPath);
Enumeration<JarEntry> entries = jarFile.entries();
while (entries.hasMoreElements()) {
JarEntry entry = entries.nextElement();
String entryName = entry.getName();
if (entryName.startsWith(relPath) && entryName.length() > (relPath.length() + "/".length())) {
//System.out.println("ClassDiscovery: JarEntry: " + entryName);
String className = entryName.replace('/', '.').replace('\\', '.').replace(".class", "");
//System.out.println("ClassDiscovery: className = " + className);
try {
classes.add(Class.forName(className));
} catch (ClassNotFoundException e) {
throw new RuntimeException("ClassNotFoundException loading " + className);
}
}
}
} catch (IOException e) {
throw new RuntimeException(pkgname + " (" + directory + ") does not appear to be a valid package", e);
}
}
return classes;
}
Did not try this on all VMs, but on a recent Oracle VM there is a shorter way:
Enumeration<URL> resources = Thread.currentThread().getContextClassLoader().getResources("package/name/with/slashes/instead/dots");
while (resources.hasMoreElements()) {
URL url = resources.nextElement();
System.out.println(url);
System.out.println(new Scanner((InputStream) url.getContent()).useDelimiter("\\A").next());
}
This will print out the names of the resources in the package, so you can use getResource(...) on them. The call url.getContent() will return an instance of sun.net.www.content.text.PlainTextInputStream which is a VM specific class.
Related
I am making an application for file uploading in Java using jSch. I want to put my file in different directories based on their creation date etc.
I have a main directory "/var/local/recordingsbackup/" in which I am creating other directories and putting data in them.
To achieve this:
I have to create Dir'y like
"/var/local/recordingsbackup/20140207/root/SUCCESS/WN/" and put
data in it.
I've tried this so far:
private void fileTransfer(ChannelSftp channelTarget, temp_recording_log recObj, String filePath) {
int fileNameStartIndex = filePath.lastIndexOf("/") + 1;
String date = new SimpleDateFormat("yyyyMMdd").format(recObj.getCalldate());
String fileName = filePath.substring(fileNameStartIndex);
String staticPath = "/var/local/recordingsbackup/";
String completeBackupPath = staticPath + date + "/" + recObj.getUsername() + "/" + recObj.getStatus() + "/" + recObj.getDisposition() + "/";
try {
InputStream get = SourceChannel.get(filePath);
try {
channelTarget.put(get, completeBackupPath + fileName);
} catch (SftpException e) {
System.out.println("Creating Directory...");
channelTarget.mkdir(completeBackupPath); // error on this line
channelTarget.put(get, completeBackupPath + fileName);
}
} catch (SftpException e) {
log.error("Error Occured ======== File or Directory dosen't exists === " + filePath);
e.printStackTrace();
}
}
If I'm creating single dir like /var/local/recordingsbackup/ then no error occurs and files successfully uploaded.
Please help me in this...how can I create these Nested Directories???
Finally, I've done it.
This is how I got succeed :
try {
channelTarget.put(get, completeBackupPath + fileName);
} catch (SftpException e) {
System.out.println("Creating Directory...");
String[] complPath = completeBackupPath.split("/");
channelTarget.cd("/");
for (String dir : complPath) {
if (folder.length() > 0) {
try {
System.out.println("Current Dir : " + channelTarget.pwd());
channelTarget.cd(folder);
} catch (SftpException e2) {
channelTarget.mkdir(folder);
channelTarget.cd(folder);
}
}
}
channelTarget.cd("/");
System.out.println("Current Dir : " + channelTarget.pwd());
channelTarget.put(get, completeBackupPath + fileName);
}
I don't think what you want to do is possible in the SFTP protocol. You will have to create each sub-directory in turn.
public static void mkdirs(ChannelSftp ch, String path) {
try {
String[] folders = path.split("/");
if (folders[0].isEmpty()) folders[0] = "/";
String fullPath = folders[0];
for (int i = 1; i < folders.length; i++) {
Vector ls = ch.ls(fullPath);
boolean isExist = false;
for (Object o : ls) {
if (o instanceof LsEntry) {
LsEntry e = (LsEntry) o;
if (e.getAttrs().isDir() && e.getFilename().equals(folders[i])) {
isExist = true;
}
}
}
if (!isExist && !folders[i].isEmpty()) {
ch.mkdir(fullPath + folders[i]);
}
fullPath = fullPath + folders[i] + "/";
}
} catch (Exception e) {
e.printStackTrace();
}
}
I used this implementation to create nested folders.
I tried not to use Exception. Keep in mind that filesystem is linux based.
The OP already found a solution but I wanted to append to it.
Simply I do mkdir if the folder that I wanted to create doesn't exist in "ls" result.
Correction of the previous script:
public static void mkdirs(ChannelSftp ch, String path) {
try {
String[] folders = path.split("/");
if (folders[0].isEmpty()) folders[0] = "/";
String fullPath = folders[0];
for (int i = 1; i < folders.length; i++) {
Vector ls = ch.ls(fullPath);
boolean isExist = false;
for (Object o : ls) {
if (o instanceof LsEntry) {
LsEntry e = (LsEntry) o;
if (e.getAttrs().isDir() && e.getFilename().equals(folders[i])) {
isExist = true;
}
}
}
if (!isExist && !folders[i].isEmpty()) {
// Add separator path
ch.mkdir(fullPath + "/" + folders[i]);
}
// Add separator path
fullPath = fullPath + "/" + folders[i] + "/";
}
} catch (Exception e) {
e.printStackTrace();
}
}
Another solution is execute shell command:
String remotePath = "fake/folders/recursive/on/sftp/server";
ChannelExec channel = (ChannelExec) session.openChannel("exec");
// NOTE: the provided paths are expected to require no escaping
channel.setCommand("mkdir -p " + remotePath);
channel.connect();
while (!channel.isClosed()) {
// dir creation is usually fast, so only wait for a short time
Thread.sleep(SHORT_WAIT_MSEC);
}
channel.disconnect();
if (channel.getExitStatus() != 0) {
throw new IOException("Creating directory failed: " + remotePath);
}
I am making an application for file uploading in Java using jSch. I want to put my file in different directories based on their creation date etc.
I have a main directory "/var/local/recordingsbackup/" in which I am creating other directories and putting data in them.
To achieve this:
I have to create Dir'y like
"/var/local/recordingsbackup/20140207/root/SUCCESS/WN/" and put
data in it.
I've tried this so far:
private void fileTransfer(ChannelSftp channelTarget, temp_recording_log recObj, String filePath) {
int fileNameStartIndex = filePath.lastIndexOf("/") + 1;
String date = new SimpleDateFormat("yyyyMMdd").format(recObj.getCalldate());
String fileName = filePath.substring(fileNameStartIndex);
String staticPath = "/var/local/recordingsbackup/";
String completeBackupPath = staticPath + date + "/" + recObj.getUsername() + "/" + recObj.getStatus() + "/" + recObj.getDisposition() + "/";
try {
InputStream get = SourceChannel.get(filePath);
try {
channelTarget.put(get, completeBackupPath + fileName);
} catch (SftpException e) {
System.out.println("Creating Directory...");
channelTarget.mkdir(completeBackupPath); // error on this line
channelTarget.put(get, completeBackupPath + fileName);
}
} catch (SftpException e) {
log.error("Error Occured ======== File or Directory dosen't exists === " + filePath);
e.printStackTrace();
}
}
If I'm creating single dir like /var/local/recordingsbackup/ then no error occurs and files successfully uploaded.
Please help me in this...how can I create these Nested Directories???
Finally, I've done it.
This is how I got succeed :
try {
channelTarget.put(get, completeBackupPath + fileName);
} catch (SftpException e) {
System.out.println("Creating Directory...");
String[] complPath = completeBackupPath.split("/");
channelTarget.cd("/");
for (String dir : complPath) {
if (folder.length() > 0) {
try {
System.out.println("Current Dir : " + channelTarget.pwd());
channelTarget.cd(folder);
} catch (SftpException e2) {
channelTarget.mkdir(folder);
channelTarget.cd(folder);
}
}
}
channelTarget.cd("/");
System.out.println("Current Dir : " + channelTarget.pwd());
channelTarget.put(get, completeBackupPath + fileName);
}
I don't think what you want to do is possible in the SFTP protocol. You will have to create each sub-directory in turn.
public static void mkdirs(ChannelSftp ch, String path) {
try {
String[] folders = path.split("/");
if (folders[0].isEmpty()) folders[0] = "/";
String fullPath = folders[0];
for (int i = 1; i < folders.length; i++) {
Vector ls = ch.ls(fullPath);
boolean isExist = false;
for (Object o : ls) {
if (o instanceof LsEntry) {
LsEntry e = (LsEntry) o;
if (e.getAttrs().isDir() && e.getFilename().equals(folders[i])) {
isExist = true;
}
}
}
if (!isExist && !folders[i].isEmpty()) {
ch.mkdir(fullPath + folders[i]);
}
fullPath = fullPath + folders[i] + "/";
}
} catch (Exception e) {
e.printStackTrace();
}
}
I used this implementation to create nested folders.
I tried not to use Exception. Keep in mind that filesystem is linux based.
The OP already found a solution but I wanted to append to it.
Simply I do mkdir if the folder that I wanted to create doesn't exist in "ls" result.
Correction of the previous script:
public static void mkdirs(ChannelSftp ch, String path) {
try {
String[] folders = path.split("/");
if (folders[0].isEmpty()) folders[0] = "/";
String fullPath = folders[0];
for (int i = 1; i < folders.length; i++) {
Vector ls = ch.ls(fullPath);
boolean isExist = false;
for (Object o : ls) {
if (o instanceof LsEntry) {
LsEntry e = (LsEntry) o;
if (e.getAttrs().isDir() && e.getFilename().equals(folders[i])) {
isExist = true;
}
}
}
if (!isExist && !folders[i].isEmpty()) {
// Add separator path
ch.mkdir(fullPath + "/" + folders[i]);
}
// Add separator path
fullPath = fullPath + "/" + folders[i] + "/";
}
} catch (Exception e) {
e.printStackTrace();
}
}
Another solution is execute shell command:
String remotePath = "fake/folders/recursive/on/sftp/server";
ChannelExec channel = (ChannelExec) session.openChannel("exec");
// NOTE: the provided paths are expected to require no escaping
channel.setCommand("mkdir -p " + remotePath);
channel.connect();
while (!channel.isClosed()) {
// dir creation is usually fast, so only wait for a short time
Thread.sleep(SHORT_WAIT_MSEC);
}
channel.disconnect();
if (channel.getExitStatus() != 0) {
throw new IOException("Creating directory failed: " + remotePath);
}
I want to find the count of files inside the svn. i know how to check is it a file or directory.
try {
nodeKind = repository.checkPath("", -1);
} catch (SVNException ex) {
Logger.getLogger(Reassignscreen.class.getName()).log(Level.SEVERE, null, ex);
}
if (nodeKind == SVNNodeKind.NONE) {
System.err.println("There is no entry at '" + url + "'.");
commitClient.doMkDir(new SVNURL[]{SVNURL.parseURIDecoded(url)}, "New Folder");
}
Like this is there any way to retrieve the count of files inside the svn.
Use this code it will help you,
public class DisplayRepositoryList{
static int xmlfilecount = 0;
static ArrayList<String> imagefoldercheck = new ArrayList<String>();
public static void displayrepositorytree(String url, String name, String password) {
xmlfilecount =0;
SVNSetupLibrary.setupLibrary();
SVNRepository repository = null;
try {
repository = SVNRepositoryFactory.create(SVNURL.parseURIEncoded(url));
} catch (SVNException svne) {
System.err.println("error while creating an SVNRepository for location '" + url + "': " + svne.getMessage());
// System.exit(1);
}
ISVNAuthenticationManager authManager = SVNWCUtil.createDefaultAuthenticationManager(name, password);
repository.setAuthenticationManager(authManager);
try {
SVNNodeKind nodeKind = repository.checkPath("", -1);
if (nodeKind == SVNNodeKind.NONE) {
System.err.println("There is no entry at '" + url + "'.");
// System.exit(1);
} else if (nodeKind == SVNNodeKind.FILE) {
System.err.println("The entry at '" + url + "' is a file while a directory was expected.");
// System.exit(1);
}
System.out.println("Repository Root: " + repository.getRepositoryRoot(true));
System.out.println("Repository UUID: " + repository.getRepositoryUUID(true));
System.out.println("");
imagefoldercheck = new ArrayList<String>();
listEntries(repository, "");
} catch (SVNException svne) {
System.err.println("error while listing entries: "
+ svne.getMessage());
}
/*
* Gets the latest revision number of the repository
*/
long latestRevision = -1;
try {
latestRevision = repository.getLatestRevision();
} catch (SVNException svne) {
System.err.println("error while fetching the latest repository revision: "
+ svne.getMessage());
// System.exit(1);
}
System.out.println("");
System.out.println("---------------------------------------------");
System.out.println("Repository latest revision: " + latestRevision);
}
/*
* Initializes the library to work with a repository via
* different protocols.
*/
public static void listEntries(SVNRepository repository, String path)
throws SVNException {
Collection entries = repository.getDir(path, -1, null,
(Collection) null);
Iterator iterator = entries.iterator();
while (iterator.hasNext()) {
SVNDirEntry entry = (SVNDirEntry) iterator.next();
if (entry.getName().endsWith(".xml")) {
System.out.println(entry.getName() + " " + xmlfilecount);
xmlfilecount = xmlfilecount + 1;
imagefoldercheck.add(entry.getName());
}
System.out.println("imagefoldercheck --> "+imagefoldercheck);
/*
* Checking up if the entry is a directory.
*/
if (entry.getKind() == SVNNodeKind.DIR) {
listEntries(repository, (path.equals("")) ? entry.getName()
: path + "/" + entry.getName());
}
}
}
}
I am making an application for file uploading in Java using jSch. I want to put my file in different directories based on their creation date etc.
I have a main directory "/var/local/recordingsbackup/" in which I am creating other directories and putting data in them.
To achieve this:
I have to create Dir'y like
"/var/local/recordingsbackup/20140207/root/SUCCESS/WN/" and put
data in it.
I've tried this so far:
private void fileTransfer(ChannelSftp channelTarget, temp_recording_log recObj, String filePath) {
int fileNameStartIndex = filePath.lastIndexOf("/") + 1;
String date = new SimpleDateFormat("yyyyMMdd").format(recObj.getCalldate());
String fileName = filePath.substring(fileNameStartIndex);
String staticPath = "/var/local/recordingsbackup/";
String completeBackupPath = staticPath + date + "/" + recObj.getUsername() + "/" + recObj.getStatus() + "/" + recObj.getDisposition() + "/";
try {
InputStream get = SourceChannel.get(filePath);
try {
channelTarget.put(get, completeBackupPath + fileName);
} catch (SftpException e) {
System.out.println("Creating Directory...");
channelTarget.mkdir(completeBackupPath); // error on this line
channelTarget.put(get, completeBackupPath + fileName);
}
} catch (SftpException e) {
log.error("Error Occured ======== File or Directory dosen't exists === " + filePath);
e.printStackTrace();
}
}
If I'm creating single dir like /var/local/recordingsbackup/ then no error occurs and files successfully uploaded.
Please help me in this...how can I create these Nested Directories???
Finally, I've done it.
This is how I got succeed :
try {
channelTarget.put(get, completeBackupPath + fileName);
} catch (SftpException e) {
System.out.println("Creating Directory...");
String[] complPath = completeBackupPath.split("/");
channelTarget.cd("/");
for (String dir : complPath) {
if (folder.length() > 0) {
try {
System.out.println("Current Dir : " + channelTarget.pwd());
channelTarget.cd(folder);
} catch (SftpException e2) {
channelTarget.mkdir(folder);
channelTarget.cd(folder);
}
}
}
channelTarget.cd("/");
System.out.println("Current Dir : " + channelTarget.pwd());
channelTarget.put(get, completeBackupPath + fileName);
}
I don't think what you want to do is possible in the SFTP protocol. You will have to create each sub-directory in turn.
public static void mkdirs(ChannelSftp ch, String path) {
try {
String[] folders = path.split("/");
if (folders[0].isEmpty()) folders[0] = "/";
String fullPath = folders[0];
for (int i = 1; i < folders.length; i++) {
Vector ls = ch.ls(fullPath);
boolean isExist = false;
for (Object o : ls) {
if (o instanceof LsEntry) {
LsEntry e = (LsEntry) o;
if (e.getAttrs().isDir() && e.getFilename().equals(folders[i])) {
isExist = true;
}
}
}
if (!isExist && !folders[i].isEmpty()) {
ch.mkdir(fullPath + folders[i]);
}
fullPath = fullPath + folders[i] + "/";
}
} catch (Exception e) {
e.printStackTrace();
}
}
I used this implementation to create nested folders.
I tried not to use Exception. Keep in mind that filesystem is linux based.
The OP already found a solution but I wanted to append to it.
Simply I do mkdir if the folder that I wanted to create doesn't exist in "ls" result.
Correction of the previous script:
public static void mkdirs(ChannelSftp ch, String path) {
try {
String[] folders = path.split("/");
if (folders[0].isEmpty()) folders[0] = "/";
String fullPath = folders[0];
for (int i = 1; i < folders.length; i++) {
Vector ls = ch.ls(fullPath);
boolean isExist = false;
for (Object o : ls) {
if (o instanceof LsEntry) {
LsEntry e = (LsEntry) o;
if (e.getAttrs().isDir() && e.getFilename().equals(folders[i])) {
isExist = true;
}
}
}
if (!isExist && !folders[i].isEmpty()) {
// Add separator path
ch.mkdir(fullPath + "/" + folders[i]);
}
// Add separator path
fullPath = fullPath + "/" + folders[i] + "/";
}
} catch (Exception e) {
e.printStackTrace();
}
}
Another solution is execute shell command:
String remotePath = "fake/folders/recursive/on/sftp/server";
ChannelExec channel = (ChannelExec) session.openChannel("exec");
// NOTE: the provided paths are expected to require no escaping
channel.setCommand("mkdir -p " + remotePath);
channel.connect();
while (!channel.isClosed()) {
// dir creation is usually fast, so only wait for a short time
Thread.sleep(SHORT_WAIT_MSEC);
}
channel.disconnect();
if (channel.getExitStatus() != 0) {
throw new IOException("Creating directory failed: " + remotePath);
}
I have a application that runs as a schedule.It connect to ftp server and get files from remote folder.scheduler runs in every 5min time.Sometimes when there are lot of files in remote location, scheduler runs again while first cycle is running.In such situation some times it download 0 size files even actual file size is greater than 0 in remote location.Does anyone have any idea why this happen?
below is the code to import files.
private void importEDIFiles(String host, String user, String password, String path, String road) {
try {
String edi824Path = path + "/" + EDI_824_FOLDER;
FTPBroker ftpBroker = new FTPBroker(host, user, password, edi824Path);
FTPClient client = ftpBroker.makeFTPConeection();
String os = client.getSystemName();
client.setFileTransferMode(FTP.ASCII_FILE_TYPE);
File edi824File = null;
File edi824Filebak = null;
ArrayList<FTPFile> files;
try {
FTPFile[] ftpfiles = client.listFiles();
logger.info("\t" + ftpfiles.length + " files are in ftp location ");
if (ftpfiles.length > 0) {
files = removeZeroFiles(ftpfiles);
for(int x=0;x<files.size();x++){
logger.info("name ---"+files.get(x).getName());
logger.info("size ----"+files.get(x).getSize());
}
String ftpFile = null;
logger.info("\t" + files.size() + " downloading from " + road + " rail road.");
for (int i = 0; i < files.size(); i++) {
ftpFile = files.get(i).getName();
logger.info("\t" + ftpFile + " is downloading....");
// logger.info("\t" + ftpFile + " size ...." + ftpFile.isEmpty());
String source = destinationFilePath + pathSeparator + road + pathSeparator + ftpFile;
String target = edi_824backupFilePath + pathSeparator + road + pathSeparator + ftpFile;
edi824File = new File(source);
edi824Filebak = new File(target);
FileOutputStream fosout = new FileOutputStream(source);
boolean isRetrieved = client.retrieveFile(ftpFile, fosout);
logger.debug("isRetrieved : " + isRetrieved);
FileUtils.copyFile(edi824File,edi824Filebak);
fosout.flush();
fosout.close();
boolean isDelete = client.deleteFile(ftpFile);
logger.debug("isDelete : " + isDelete);
}
} else {
logger.info("No files to Pull in the FTP Location for " + user);
//throw new RuntimeException("No files to Pull in FTP Location.");
}
} catch (Exception e) {
logger.error(e,e);
e.printStackTrace();
} finally {
client.logout();
client.disconnect();
}
} catch (Exception ex) {
logger.error(ex, ex);
ex.printStackTrace();
}
}
you can use a flag boolean isRunning(), setRunning(boolean ), and synchronize your code so that two or more threads would not run the same method at the same time