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I created an algorithm to traverse a directory tree and mirror its contents. The exception is when the program enters a directory with 400 images. It copies the images until it reaches an image around 320 and casts the following exception, in the copy methodFile, conditional isImagemJPG:
Exception in thread "main" java.lang.IllegalArgumentException: image == null!
at javax.imageio.ImageTypeSpecifier.createFromRenderedImage(Unknown Source)
at javax.imageio.ImageIO.getWriter(Unknown Source)
at javax.imageio.ImageIO.write(Unknown Source)
at Main.copiaArquivo(Main.java:53)
at Main.entraDiretorio(Main.java:44)
at Main.entraDiretorio(Main.java:42)
at Main.entraDiretorio(Main.java:42)
at Main.entraDiretorio(Main.java:42)
at Main.main(Main.java:31)
The code is as follows::
import java.awt.image.BufferedImage;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import javax.imageio.ImageIO;
public class Main {
private static File raizDiretorio;
private static File raizDiretorioCP;
private static String caminho = "D:\\Ultimate Collection\\info\\xyz\\";
public static void main(String[] args) throws IOException {
raizDiretorio = new File(caminho);
raizDiretorioCP = new File(caminho + "copia\\");
raizDiretorioCP.mkdir();
File[] files = raizDiretorio.listFiles();
entraDiretorio(files);
}
private static void entraDiretorio(File[] files) throws FileNotFoundException, IOException {
for (File file : files) {
if (file.isDirectory() && !file.getAbsolutePath().equals(raizDiretorioCP.getAbsolutePath())) {
File[] listSubDiretorio = file.listFiles();
file = new File(preparaCaminhoFileSaida(file));
System.out.println("Criando diretorio " + file.getAbsolutePath());
file.mkdir();
entraDiretorio(listSubDiretorio);
} else if (file.isFile() && !file.getAbsolutePath().equals(raizDiretorioCP.getAbsolutePath())) {
copiaArquivo(file);
}
}
}
private static void copiaArquivo(File file) throws FileNotFoundException, IOException {
String caminhoSaida = preparaCaminhoFileSaida(file);
if (isImagemJPG(file)) {
BufferedImage img = ImageIO.read(file);
System.out.println("Copiando imagem de :" + file.getPath() + "\n para: " + caminhoSaida);
ImageIO.write(img, "jpg", new File(caminhoSaida));
} else
{
File outFile = new File(caminhoSaida);
if (!outFile.exists() && outFile.isDirectory())
outFile.mkdir();
System.out.println("Copiando arquivo: " + file.getAbsolutePath());
OutputStream ou = new FileOutputStream(outFile);
OutputStreamWriter osw = new OutputStreamWriter(ou);
BufferedWriter bw = new BufferedWriter(osw);
String texto = "";
BufferedReader reader = new BufferedReader(new FileReader(file));
String linha = reader.readLine();
while (linha != null) {
texto += linha;
linha = reader.readLine();
}
texto = texto.replaceAll("nomealeatorio", "");
bw.write(texto);
bw.close();
}
}
private static boolean isImagemJPG(File file) {
return file.getName().endsWith(".jpg");
}
private static String preparaCaminhoFileSaida(File file) throws IOException {
String path = file.getAbsolutePath();
path = path.replace(caminho, raizDiretorioCP.getCanonicalPath() + "\\");
return path;
}
}
If I put a conditional to skip this photo that throws the exception the program continues but after a few photos it throws again the exception in another photo. I have already checked the extension of the photos and they are all jpg. There is no other file type in the directory. I don’t understand why to a certain extent the algorithm works and then it doesn’t.
Already checked if those files that launch the exception are even images. They may have the extension jpg and are not.
– ramaral
Some other points do not fit directly in the answer. Your code is loaded with methods and static variables (which is not a good sign). Also, it seems to me that you are reinventing the wheel... Take a look at the class Files, There is enough thing ready to walk file trees and do simple read/write/copy operations.
– Anthony Accioly
If the idea is to copy an entire directory take a look at
FileUtils.copyDirectorylibrary Apache Commons IO– Anthony Accioly