Java File Utility: Apache FileUtils

copy file to another directory:

public void moveTheFile () {
        try {
            File destDir = new File("C:\\Folder1\\temp2");
            File srcFile = new File("C:\\Folder1\\temp\\card.png");
            FileUtils.copyFileToDirectory(srcFile, destDir);
        } catch(Exception e) {
        }
    }

iterate files of extension in directory recursively:
public void iterateFiles() {
            File destDir = new File("C:\\Folder1\\temp2");
            String[] extensions = {"png", "jpg"};
            Iterator filesInDir = FileUtils.iterateFiles(new File(desDir), extensions, true); //true for recursive
            while(filesInFolder.hasNext()){
   File file = (File) filesInFolder.next();

            }

    }

iterate directories in a directory:


File dir = new File("c:\temp\");
for(File child: dir.listFiles()){
 if(child.isDirectory()){
  //do something
 }
}





list files of certain type in a directory:
File dir = new File("c:\temp\");
File[] files = dir.listFiles(new FilenameFilter() {
public boolean accept(File dir, String name) {
    return name.toLowerCase().endsWith(".properties");
   }
  });


Write String to File:


FileUtils.writeStringToFile(new File("test.txt"), "Hello File");