Develop Reference

Jar executable of spring app file upload failed?

This spring app performs simple file upload,
here's the controller class
#Override
public String fileUpload(MultipartFile file) {
try{
// save uploaded image to images folder in root dir
Files.write(Paths.get("images/"+ file.getOriginalFilename()), file.getBytes());
// perform some tasks on image
return "";
} catch (IOException ioException) {
return "File upload has failed.";
} finally {
Files.delete(Paths.get("images/" + file.getOriginalFilename()));
}
}
but when i build jar and runs, it throws IOException saying,
java.nio.file.NoSuchFileException: images\8c9.jpeg.
So my question is how can i add the images folder inside the jar executable itself.
Thanks.

You should provide a full path for the images folder, or save in java.io.tmpdir creating the image folder first.
But, in my opinion you should configure your upload folder from a config file for flexibility. Take a look at this.
app:
profile-image:
upload-dir: C:\\projs\\web\\profile_image
file-types: jpg, JPG, png, PNG
width-height: 360, 360
max-size: 5242880
In your service or controller, do whatever you like, may be validate image type, size etc and process it as you like. For instance, if you want thumbnails(or avatar..).
In your controller or service class, get the directory:
#Value("${app.image-upload-dir:../images}")
private String imageUploadDir;
Finally,
public static Path uploadFileToPath(String fullFileName, String uploadDir, byte[] filecontent) throws IOException {
Path fileOut = null;
try{
Path fileAbsolutePath = Paths.get(StringUtils.join(uploadDir, File.separatorChar, fullFileName));
fileOut = Files.write(fileAbsolutePath, filecontent);
}catch (Exception e) {
throw e;
}
return fileOut; //full path of the file
}
For your question in the comment: You can use java.io.File.deleteOnExit() method, which deletes the file or directory defined by the abstract path name when the virtual machine terminates. TAKE A GOOD CARE THOUGH, it might leave some files if not handled properly.
try (ByteArrayOutputStream output = new ByteArrayOutputStream();){
URL fileUrl = new URL(url);
String tempDir = System.getProperty("java.io.tmpdir");
String path = tempDir + new Date().getTime() + ".jpg"; // note file extension
java.io.File file = new java.io.File(path);
file.deleteOnExit();
inputStream = fileUrl.openStream();
ByteStreams.copy(inputStream, output); // ByteStreams - Guava
outputStream = new FileOutputStream(file);
output.writeTo(outputStream);
outputStream.flush();
return file;
} catch (Exception e) {
throw e;
} finally {
try {
if(inputStream != null) {
inputStream.close();
}
if(outputStream != null) {
outputStream.close();
}
} catch(Exception e){
//skip
}
}

user.properties in /bin has no effect in JMeter

I will use user.properties to overwrite some properties in jmeter.properties.
Overwriting the properties summariser.out in jmeter.properties:
in jmeter.properties
summariser.out=true
in user.properties
summariser.out=false
In the apache doc is written:
Note: You can define additional JMeter properties in the file defined
by the JMeter property user.properties which has the default value
user.properties. The file will be automatically loaded if it is found
in the current directory or if it is found in the JMeter bin
directory. Similarly, system.properties is used to update system
properties.
so, my user.properties is in /bin and I the property in jmeter.properties -> user.properties=user.properties.
I tried also to load manually like:
Properties props = new Properties();
InputStream is = getTempInputStream(userPropTempFilePath);
props.load(is);
is.close();
That all has no effect.
Some idea how to load user.properties in java and to check if the properties are loaded?

Thats the solution:
String userProp = JMeterUtils.getPropDefault("user.properties", "");
if (userProp.length() > 0) {
FileInputStream fis = null;
try {
File file = JMeterUtils.findFile(userProp);
if (file.canRead()) {
log.info("Loading user properties from: "
+ file.getCanonicalPath());
fis = new FileInputStream(file);
Properties tmp = new Properties();
tmp.load(fis);
jmeterProps.putAll(tmp);
LoggingManager.setLoggingLevels(jmeterProps);//Do what would be done earlier
}
} catch (IOException e) {
log.warn("Error loading user property file: " + userProp, e);
} finally {
try {
if (fis != null) {
fis.close();
}
} catch (IOException ex) {
log.warn("There was problem closing file stream", ex);
}
}
}

Unable to find properties file

Where is config.properties stored ?
I can't seem to track it down. I am able to read from it so I know it exists.
I use maven for dependency management, the WAR file is built using Eclipse default build action.
I checked all the following locations in the Navigator view, Package Explorer and the WAR file:
/
/src
/WebContent
/WebContent/Web-INF
Properties prop = new Properties();
OutputStream output = null;
try {
output = new FileOutputStream("config.properties");
// set the properties value
prop.setProperty("os", OsDetect.getPropertyOsName());
// save properties to project root folder
prop.store(output, null);
}
catch (IOException io) {
io.printStackTrace();
}
finally {
if (output != null) {
try {
output.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}

I ended up putting the file in my WEB-INF/lib folder and manually edit it with the key/value properties. Placing it in the WEB-INF makes it unavailable for direct Servlet request.
To read the from the properties file I do the following :
private final String PROPERTIESPATH ="/WEB-INF/lib/config.properties";
private final Properties properties = new Properties();
private void loadProperties(ServletContextEvent context) {
....
InputStream input = context.getServletContext().getResourceAsStream(PROPERTIESPATH);
properties.load(input);
....
}

How to name a file from a folder in java?

I have a file named InputFile.txt in a resources folder.
My project structure is like this:
VirtualMemory
src
resources
InputFile.txt
VirtualMemory
VirtualMemory.java
And I am trying to access the InputFile.txt in VirtualMemory.java class by like this:
String filename = ("./src/resources/InputFile.txt");
File file = new File(filename);
But the file is not being found. How to resolve this problem?

Below code will help load a properties file from any where in the classpath.
ClassLoader cl = ClassLoader.getSystemClassLoader();
if (cl != null) {
URL url = cl.getResource(CONF_PROPERTIES);
if (url == null) {
url = cl.getResource("/" + CONF_PROPERTIES);
}
if (url != null) {
try {
InputStream in = url.openStream();
props = new Properties();
props.load(in);
} catch (IOException e) {
// Log the exception
} finally {
// close opened resources
}
}
}

Reading properties file from JAR directory

I’m creating an executable JAR that will read in a set of properties at runtime from a file. The directory structure will be something like:
/some/dirs/executable.jar
/some/dirs/executable.properties
Is there a way of setting the property loader class in the executable.jar file to load the properties from the directory that the jar is in, rather than hard-coding the directory.
I don't want to put the properties in the jar itself as the properties file needs to be configurable.

Why not just pass the properties file as an argument to your main method? That way you can load the properties as follows:
public static void main(String[] args) throws IOException {
Properties props = new Properties();
props.load(new BufferedReader(new FileReader(args[0])));
System.setProperties(props);
}
The alternative: If you want to get the current directory of your jar file you need to do something nasty like:
CodeSource codeSource = MyClass.class.getProtectionDomain().getCodeSource();
File jarFile = new File(codeSource.getLocation().toURI().getPath());
File jarDir = jarFile.getParentFile();
if (jarDir != null && jarDir.isDirectory()) {
File propFile = new File(jarDir, "myFile.properties");
}
... where MyClass is a class from within your jar file. It's not something I'd recommend though - What if your app has multiple MyClass instances on the classpath in different jar files (each jar in a different directory)? i.e. You can never really guarantee that MyClass was loaded from the jar you think it was.

public static void loadJarCongFile(Class Utilclass )
{
try{
String path= Utilclass.getResource("").getPath();
path=path.substring(6,path.length()-1);
path=path.split("!")[0];
System.out.println(path);
JarFile jarFile = new JarFile(path);
final Enumeration<JarEntry> entries = jarFile.entries();
while (entries.hasMoreElements()) {
final JarEntry entry = entries.nextElement();
if (entry.getName().contains(".properties")) {
System.out.println("Jar File Property File: " + entry.getName());
JarEntry fileEntry = jarFile.getJarEntry(entry.getName());
InputStream input = jarFile.getInputStream(fileEntry);
setSystemvariable(input);
InputStreamReader isr = new InputStreamReader(input);
BufferedReader reader = new BufferedReader(isr);
String line;
while ((line = reader.readLine()) != null) {
System.out.println("Jar file"+line);
}
reader.close();
}
}
}
catch (Exception e)
{
System.out.println("Jar file reading Error");
}
}
public static void setSystemvariable(InputStream input)
{
Properties tmp1 = new Properties();
try {
tmp1.load(input);
for (Object element : tmp1.keySet()) {
System.setProperty(element.toString().trim(),
tmp1.getProperty(element.toString().trim()).trim());
}
} catch (IOException e) {
System.out.println("setSystemvariable method failure");
}
}