如何在 jTree 中顯示 Windows 注冊表？

Question

I am using java swing.I want to show windows registry in jTree how it is possible.I am new in java please give me a solution.Actually i want to delete a particular windows registry key i done it but i can not show it in jtree 意味着我顯示了 regkey 刪除之前和刪除之后的結構。

Answer 1

我有類似的問題，並且無法找到現成的東西。 經過一番閱讀，我編寫了一個實現 class 的 TreeModel 來執行此操作。
Class 可用於將任何 TreePath 列表轉換為樹，例如：

A->B->C->D
A->B->E->F
A->G->H->J

會變成：

A+
 |B+
 | |C+
 | | |D
 | |E+
 |   |F
 |G+
   |H+
     |J

這里是：

    import java.util.ArrayList;
    import java.util.Arrays;
    import java.util.Iterator;
    import java.util.NoSuchElementException;
    import javax.swing.event.TreeModelListener;
    import javax.swing.tree.DefaultMutableTreeNode;
    import javax.swing.tree.TreeModel;
    import javax.swing.tree.TreePath;

    /**
     *
     * @author Majkel
     */
    public class TreePathsTreeModel implements TreeModel {
      private final ArrayList<TreePath> paths;
      private final String root;

      public TreePathsTreeModel(String root, TreePath[] paths) {
        this.root = root;
        this.paths = new ArrayList<TreePath> (Arrays.asList(paths));
      }


      @Override
      public Object getRoot() {
        return this.root;
      }

      @Override
      public Object getChild(Object parent, int index) {
        try {
          return getChildren(parent).get(index);
        } catch (IndexOutOfBoundsException ex) {
          return null;
        }
      }

      @Override
      public int getChildCount(Object parent) {
        return getChildren(parent).size();
      }

      @Override
      public boolean isLeaf(Object node) {
        for (int i = 0; i < paths.size(); i++) {
          TreePath treePath = paths.get(i);
          if (treePath.getLastPathComponent().equals(node))
            return true;
        }
        return false;
      }

      // This method is only required for editable trees, so it is not
      // implemented here.
      @Override
      public void valueForPathChanged(TreePath path, Object newValue) {
        //throw new UnsupportedOperationException("Not supported yet.");
      }

      @Override
      public int getIndexOfChild(Object parent, Object child) {
        return getChildren(parent).indexOf(child);
      }

      // This TreeModel never fires any events (since it is not editable)
      // so event listener registration methods are left unimplemented
      @Override
      public void addTreeModelListener(TreeModelListener l) {
        //throw new UnsupportedOperationException("Not supported yet.");
      }

      @Override
      public void removeTreeModelListener(TreeModelListener l) {
        //throw new UnsupportedOperationException("Not supported yet.");
      }
              //search all paths in list for given object 
              //return every item one level further than it
      private ArrayList<String> getChildren(Object parent) {
        ArrayList<String> children = new ArrayList<String>();
        for (int i = 0; i < this.paths.size(); i++) {
          ArrayList<Object> pathObjects = new ArrayList<Object>( Arrays.asList(this.paths.get(i).getPath()) );
          for (Iterator<Object> it = pathObjects.iterator(); it.hasNext();) {
            Object parentCandidate = it.next();
            if (parentCandidate.equals(parent)) {
              Iterator<Object> checker = it;
              try {
                String child = new DefaultMutableTreeNode( checker.next() ).toString();
                if ( !children.contains(child) )
                  children.add (child);
              } catch (NoSuchElementException ex) {

              } 
            }
          }
        }
        return children;
      }

    }

它容易受到重復條目的影響，例如：

A->B->C->D
A->C->E->F
A->G->H->J

會變成：

 A+
  |B+
  | |C+
  |   |D
  |   |E+
  |     |F
  |C+
  | |D
  | |E+
  |   |F
  |G+
    |H+
      |J

也許我稍后會修復它，或者也許有人知道如何做到這一點？ 使用示例：

TreePath tpOne = new TreePath(new String [] {"A", "B", "C", "D"});
TreePath tpTwo = new TreePath(new String [] {"A", "B", "E", "F"});
TreePath tpThree = new TreePath(new String [] {"A", "G", "H", "J"});

TreeModel model = new TreePathsTreeModel("A", TreePath[]{tpOne, tpTwo, tpThree}  );
JTree tree = new JTree(model);

Answer 2

看看“ 使用 Java 讀/寫 Windows 注冊表”

更新：要在JTree中顯示注冊表，您需要提供TreeModel 。

我將從Oracle 的理解 TreeModel中的FileSystemModel開始，並將文件調用替換為對您正在使用的注冊表庫的調用。

win32 注冊表可能非常大，因此您可能需要添加TreeExpansionListener來釋放已關閉的分支。 這是關於樹擴展偵聽器的 Oracle 文章。