如何使用 JTree 从文件创建树视图?
How to make a tree view from a file using JTree?
我有一个文件 abc.csv
,它是我的 bom(material 的清单)文件。我需要使用该文件使用 Jtree 制作树视图。我的文件有这样的数据:
PARENT_NAME QUANTITY COMPONENT_NAME
HOLDER 1 BODY
HOLDER 1 PTRY_GASKET
HOLDER 1 PTRY
HOLDER 1 DISC
HOLDER 1 GUIDE_SET
HOLDER 1 STEM
HOLDER 1 COV_FLG
HOLDER 1 FOLLOW_FLG
.... other entries here
这是我在 gist 中的完整文件,因为它是一个非常大的文件,所以我无法将其粘贴到这里。
自从我最近开始使用 JTree,所以我有点搞不清楚它是如何工作的。到目前为止我得到了以下代码:
public static void main(String[] args) {
JFrame frame = new JFrame("FileTree");
frame.setForeground(Color.black);
frame.setBackground(Color.lightGray);
Container cp = frame.getContentPane();
if (args.length == 0) {
cp.add(new FileTree(new File("abc.csv")));
}
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public FileTree(File dir) {
setLayout(new BorderLayout());
// Now how do I make a tree list with all the nodes, and make it a JTree from my bom
}
您可以根据 DefaultTreeModel
创建自定义 TreeModel
并用您的数据填充它,如下例所示:
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeNode;
@SuppressWarnings("serial")
public class FileTree extends JFrame
{
private JTree tree;
private Path path;
public FileTree(Path path)
{
this.path = path;
setTitle("File Tree");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
initializeComponents();
pack();
setVisible(true);
}
public void initializeComponents()
{
try
{
tree = new JTree(new CustomTreeModel(
new DefaultMutableTreeNode("Data"), path));
}
catch (IOException e)
{
JOptionPane.showMessageDialog(this,
"Error while reading input file.", "error",
JOptionPane.ERROR_MESSAGE);
}
tree.setRootVisible(false);
add(new JScrollPane(tree));
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
try
{
UIManager.setLookAndFeel(
"javax.swing.plaf.nimbus.NimbusLookAndFeel");
}
catch (ClassNotFoundException | InstantiationException
| IllegalAccessException
| UnsupportedLookAndFeelException e)
{
}
String path = "/home/mohamed/Desktop/abc.csv";
if (args.length > 0)
{
path = args[0];
}
new FileTree(Paths.get(path));
}
});
}
}
class CustomTreeModel extends DefaultTreeModel
{
private static final long serialVersionUID = -274517614354269449L;
public CustomTreeModel(TreeNode root, Path path) throws IOException
{
super(root);
try (BufferedReader br = new BufferedReader(
new FileReader(path.toFile())))
{
String s = null;
DefaultMutableTreeNode rootNode = (DefaultMutableTreeNode) root;
int skipFirstLine = -1;
List<String> items = new ArrayList<>();
DefaultMutableTreeNode parentName;
DefaultMutableTreeNode quantity;
DefaultMutableTreeNode componentName;
while ((s = br.readLine()) != null)
{
if (skipFirstLine == -1)
{
skipFirstLine = 0;
continue;
}
items.addAll(Arrays.asList(s.split("\s")));
items.removeAll(Arrays.asList(""));
if (items.size() == 3)
{
parentName = new DefaultMutableTreeNode(items.get(0));
parentName.setAllowsChildren(false);
quantity = new DefaultMutableTreeNode(items.get(1));
quantity.setAllowsChildren(false);
componentName = new DefaultMutableTreeNode(items.get(2));
componentName.add(parentName);
componentName.add(quantity);
rootNode.add(componentName);
}
items.clear();
}
setRoot(rootNode);
}
catch (IOException e)
{
throw e;
}
}
}
结果如下:
我有一个文件 abc.csv
,它是我的 bom(material 的清单)文件。我需要使用该文件使用 Jtree 制作树视图。我的文件有这样的数据:
PARENT_NAME QUANTITY COMPONENT_NAME
HOLDER 1 BODY
HOLDER 1 PTRY_GASKET
HOLDER 1 PTRY
HOLDER 1 DISC
HOLDER 1 GUIDE_SET
HOLDER 1 STEM
HOLDER 1 COV_FLG
HOLDER 1 FOLLOW_FLG
.... other entries here
这是我在 gist 中的完整文件,因为它是一个非常大的文件,所以我无法将其粘贴到这里。
自从我最近开始使用 JTree,所以我有点搞不清楚它是如何工作的。到目前为止我得到了以下代码:
public static void main(String[] args) {
JFrame frame = new JFrame("FileTree");
frame.setForeground(Color.black);
frame.setBackground(Color.lightGray);
Container cp = frame.getContentPane();
if (args.length == 0) {
cp.add(new FileTree(new File("abc.csv")));
}
frame.pack();
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public FileTree(File dir) {
setLayout(new BorderLayout());
// Now how do I make a tree list with all the nodes, and make it a JTree from my bom
}
您可以根据 DefaultTreeModel
创建自定义 TreeModel
并用您的数据填充它,如下例所示:
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeNode;
@SuppressWarnings("serial")
public class FileTree extends JFrame
{
private JTree tree;
private Path path;
public FileTree(Path path)
{
this.path = path;
setTitle("File Tree");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
initializeComponents();
pack();
setVisible(true);
}
public void initializeComponents()
{
try
{
tree = new JTree(new CustomTreeModel(
new DefaultMutableTreeNode("Data"), path));
}
catch (IOException e)
{
JOptionPane.showMessageDialog(this,
"Error while reading input file.", "error",
JOptionPane.ERROR_MESSAGE);
}
tree.setRootVisible(false);
add(new JScrollPane(tree));
}
public static void main(String[] args)
{
SwingUtilities.invokeLater(new Runnable()
{
@Override
public void run()
{
try
{
UIManager.setLookAndFeel(
"javax.swing.plaf.nimbus.NimbusLookAndFeel");
}
catch (ClassNotFoundException | InstantiationException
| IllegalAccessException
| UnsupportedLookAndFeelException e)
{
}
String path = "/home/mohamed/Desktop/abc.csv";
if (args.length > 0)
{
path = args[0];
}
new FileTree(Paths.get(path));
}
});
}
}
class CustomTreeModel extends DefaultTreeModel
{
private static final long serialVersionUID = -274517614354269449L;
public CustomTreeModel(TreeNode root, Path path) throws IOException
{
super(root);
try (BufferedReader br = new BufferedReader(
new FileReader(path.toFile())))
{
String s = null;
DefaultMutableTreeNode rootNode = (DefaultMutableTreeNode) root;
int skipFirstLine = -1;
List<String> items = new ArrayList<>();
DefaultMutableTreeNode parentName;
DefaultMutableTreeNode quantity;
DefaultMutableTreeNode componentName;
while ((s = br.readLine()) != null)
{
if (skipFirstLine == -1)
{
skipFirstLine = 0;
continue;
}
items.addAll(Arrays.asList(s.split("\s")));
items.removeAll(Arrays.asList(""));
if (items.size() == 3)
{
parentName = new DefaultMutableTreeNode(items.get(0));
parentName.setAllowsChildren(false);
quantity = new DefaultMutableTreeNode(items.get(1));
quantity.setAllowsChildren(false);
componentName = new DefaultMutableTreeNode(items.get(2));
componentName.add(parentName);
componentName.add(quantity);
rootNode.add(componentName);
}
items.clear();
}
setRoot(rootNode);
}
catch (IOException e)
{
throw e;
}
}
}
结果如下: