The general way to use a TreeViewer:

1. Creating a TreeViewer

2. Creating a content provider class and setting it on the TreeViewer using setContentProvider()

3. Creating a label provider class and setting it on the TreeViewer using setLabelProvider()

4. Setting the root input for the tree using setInput()

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.jface.viewers.ILabelProvider;
import org.eclipse.jface.viewers.ILabelProviderListener;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.jface.window.ApplicationWindow;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;

public class FileTreeWindowApplication {
  public static void main(String[] args) {
    FileTreeWindow main = new FileTreeWindow();
  }
}

class FileTreeWindow extends ApplicationWindow {
  public FileTreeWindow() {
    super(null);
    // Don't return from open() until window closes
    setBlockOnOpen(true);

    open();
    Display.getCurrent().dispose();
  }

  protected void configureShell(Shell shell) {
    super.configureShell(shell);
    shell.setSize(400, 400);
  }

  protected Control createContents(Composite parent) {
    Composite composite = new Composite(parent, SWT.NONE);
    composite.setLayout(new FillLayout());

    final TreeViewer tv = new TreeViewer(composite);
    tv.getTree().setLayoutData(new GridData(GridData.FILL_BOTH));
    tv.setContentProvider(new FileTreeContentProvider());
    tv.setLabelProvider(new FileTreeLabelProvider());
    tv.setInput("root");

    return composite;
  }
}

class FileTreeContentProvider implements ITreeContentProvider {
  public Object[] getChildren(Object arg0) {
    return ((File) arg0).listFiles();
  }

  public Object getParent(Object arg0) {
    return ((File) arg0).getParentFile();
  }

  public boolean hasChildren(Object arg0) {
    Object[] obj = getChildren(arg0);
    return obj == null ? false : obj.length > 0;
  }

  public Object[] getElements(Object arg0) {
    return File.listRoots();
  }

  public void dispose() {
  }

  public void inputChanged(Viewer arg0, Object arg1, Object arg2) {
  }
}

class FileTreeLabelProvider implements ILabelProvider {
  private List listeners;

  private Image file;

  private Image dir;

  public FileTreeLabelProvider() {
    listeners = new ArrayList();

    try {
      file = new Image(null, new FileInputStream("images/file.gif"));
      dir = new Image(null, new FileInputStream("images/directory.gif"));
    } catch (FileNotFoundException e) {
    }
  }

  public Image getImage(Object arg0) {
    return ((File) arg0).isDirectory() ? dir : file;
  }

  public String getText(Object arg0) {
    String text = ((File) arg0).getName();

    if (((File) arg0).getName().length() == 0) {
      text = ((File) arg0).getPath();
    }
    return text;
  }

  public void addListener(ILabelProviderListener arg0) {
    listeners.add(arg0);
  }

  public void dispose() {
    // Dispose the images
    if (dir != null)
      dir.dispose();
    if (file != null)
      file.dispose();
  }

  public boolean isLabelProperty(Object arg0, String arg1) {
    return false;
  }

  public void removeListener(ILabelProviderListener arg0) {
    listeners.remove(arg0);
  }
}

[출처] http://www.java2s.com/Tutorial/Java/0280__SWT/UsingaTreeViewer.htm

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