java - 我想在单击每个树节点时将信息添加到 jpanel jscrollpane 中

Question

我想在单击每个树节点时将要添加的信息放入 jpanel jscrollpane...拜托...!!!

1.我想控制在Tree.java中Frame.java中选择的树节点的状态

树.java

package pms;
import java.awt.BorderLayout;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;

public class Tree extends JTree {
private JTree tree;
public static int selectItem = 0;

public JTree CreateTree() {
    setLayout(new BorderLayout());
    DefaultMutableTreeNode root = new DefaultMutableTreeNode("Management");
    DefaultMutableTreeNode bigLeaf1 = new DefaultMutableTreeNode("Generl Affair");
    DefaultMutableTreeNode bigLeaf2 = new DefaultMutableTreeNode("Personal Affair");
    final DefaultMutableTreeNode leaf2 = new DefaultMutableTreeNode("Recruit");
    final DefaultMutableTreeNode leaf3 = new DefaultMutableTreeNode("test");

    bigLeaf1.add(leaf2);
    bigLeaf2.add(leaf3);
    root.add(bigLeaf1);
    root.add(bigLeaf2);
    tree = new JTree(root);

    tree.addMouseListener(new MouseAdapter() {
        public void mouseClicked(MouseEvent e) {
            TreePath tp = tree.getPathForLocation(e.getX(), e.getY());
            if (e.getClickCount() >= 2) {
                if (tp.getLastPathComponent() == leaf2) {
                    selectItem = 2;
                    System.out.println(selectItem);
                } else if (tp.getLastPathComponent() == leaf3) {
                    selectItem = 3;
                    System.out.println(selectItem);
                }
            }
        }
    });

    return tree;
    }

    public int selectedItem() {
        return selectItem;
    }
}

框架.java

package pms;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.GridLayout;
import java.util.ArrayList;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ScrollPaneConstants;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;

public class Frame extends JFrame implements Runnable {
    static int v = ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED;
    static int h = ScrollPaneConstants.HORIZONTAL_SCROLLBAR_AS_NEEDED;
    private JPanel pan1, pan2, pan3, pan4;
    public static JScrollPane jsp2;
    public Tree tree;
    public static ArrayList<Viewer> ViewArr = new ArrayList<Viewer>();
    public static int selectItem = 0;

    public Frame() {
        setTitle("Personal Management System");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        getContentPane().setLayout(null); // AbsoulteLayout

        /** Create MenuBar */
        menuBar menubar = new menuBar();
        setJMenuBar(menubar.CreateMenuBar());

        pan1 = new JPanel(new GridLayout()); // TreeNode ScrollPane
        pan2 = new JPanel(new BorderLayout()); // toolbar & ScrollPane2
        pan1.setBounds(0, 0, 350, 950); // Fixed Panel Size
        pan2.setBounds(350, 0, 1300, 950);
        getContentPane().add(pan1);
        getContentPane().add(pan2);

        /** Create Tree */
        tree = new Tree();

        JScrollPane jsp1 = new JScrollPane(tree.CreateTree(), v, h);
        pan1.add(jsp1);

        /** Create toolbar Panel */
        pan3 = new toolBar().CreateToolbar();
        pan2.setLayout(new BorderLayout());
        pan2.add(pan3, "North");

        /** Create viewer ScrollPane */
        jsp2 = new JScrollPane(v, h);
        jsp2.setBackground(Color.cyan);

        pan2.add(jsp2, "East");
        setSize(1300, 950);
        setVisible(true);
    }

    public void ShowInterViewer() {
        selectItem = tree.selectedItem();
        try {
            if (selectItem == 2) {
                System.out.println("222");
            } else if (selectItem == 3) {
                System.out.println("333");
            }
        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Frame frame = new Frame();
        frame.run();
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
            }
        });
    }

    @Override
    public void run() {
        // TODO Auto-generated method stub
        ShowInterViewer();
    }
}

查看器.java

    package pms;

import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Date;

import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class Viewer extends JPanel implements ActionListener{
    private JPanel jp;
    private JTextField tf1, tf2, tf3, tf4, tf5, tf6;
    private JLabel lb1, lb2, lb3, lb4, lb5, lb6;
    private JButton btn1;
    private String name, sex, pass, phone, picturePath, filePath;
    private Date birthday, interviewDate;

    public Viewer(String name, Date birthday, String sex, Date interviewDate, String pass, String phone) {
        setName(name);
        setSex(sex);
        setPass(pass);
        setPass(pass);
        CreateViewer();
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        if(sex.equals("M")){
            this.sex = "남자";
        }else if(sex.equals("W")){
            this.sex = "여자";
        }
    }

    public String getPass() {
        return pass;
    }

    public void setPass(String pass) {
        if(pass.equals("Y")){
            this.pass = "합격";
        }else if(pass.equals("N")){
            this.pass = "불합격";
        }
    }

    public String getPhone() {
        return phone;
    }

    public void setPhone(String phone) {
        this.phone = phone;
    }

    public String getPicturePath() {
        return picturePath;
    }

    public void setPicturePath(String picturePath) {
        this.picturePath = picturePath;
    }

    public String getFilePath() {
        return filePath;
    }

    public void setFilePath(String filePath) {
        this.filePath = filePath;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }

    public Date getInterviewDate() {
        return interviewDate;
    }

    public void setInterviewDate(Date interviewDate) {
        this.interviewDate = interviewDate;
    }

    public JPanel CreateViewer(){
        jp = new JPanel(new BorderLayout());

        tf1 = new JTextField(getName());
        tf1.setColumns(20);
        //tf1.setBounds(50,50,10,10);
        tf2 = new JTextField();
        tf2.setColumns(20);
        tf3 = new JTextField();
        tf3.setColumns(20);
        tf4 = new JTextField();
        tf4.setColumns(20);
        tf5 = new JTextField();
        tf5.setColumns(20);
        tf6 = new JTextField();
        tf6.setColumns(20);

        lb1 = new JLabel("이름");
        lb2 = new JLabel("생년월일");
        lb3 = new JLabel("성별");
        lb4 = new JLabel("면접일자");
        lb5 = new JLabel("합격여부");
        lb6 = new JLabel("연락처");

        btn1 = new JButton("이력서 보기");



        jp.add(tf1);
        jp.add(tf2);
        jp.add(tf3);
        jp.add(tf4);
        jp.add(tf5);
        jp.add(tf6);
        jp.add(lb1);
        jp.add(lb2);
        jp.add(lb3);
        jp.add(lb4);
        jp.add(lb5);
        jp.add(lb6);
        jp.add(btn1);

        return jp;
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        // TODO Auto-generated method stub

    }
}

Answer 1

首先，您确实不需要扩展 JTree ，您没有向该类添加任何新功能(也没有实际使用它)，而是只需创建 JTree 的实例并将其传递给它实例化您的数据的 TreeModel。

这意味着您可以自由地将 TreeListSelection 添加到 JTree 中，它会告诉您选择何时发生变化。从生成的 TreeSelectionEvent 中，您可以获取选定的 path ，它将告诉您从根到当前选定节点的选定组件。然后，您可以使用 getLastPathComponent 获取路径中的最后一个节点(这将是选定的节点)。

获得此信息后，您就可以决定如何最好地将其提供给相应的 View 。由于您使用的是 DefaultMutableTreeNode ，因此您可以将 userObject 与其关联，这样可以更轻松地在每个节点上存储复杂数据。

根据您的 Viewer 类，数据似乎非常通用，在这种情况下，我会考虑创建 POJO 来维护所有关联的数据并将其简单地应用于 DefaultMutableTreeNode ，这样您就可以使用 getUserObject 来提取它容易地。然后，您只需将此对象传递到 Viewer 面板(通过某种 setter )并让查看器相应地更新其自己的状态

查看 How to Use Trees 了解更多详细信息

例如...

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.text.DateFormat;
import java.time.LocalDate;
import java.time.Month;
import java.util.Date;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextField;
import javax.swing.JTree;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreePath;

public class InterviewBrowser {

    public static void main(String[] args) {
        new InterviewBrowser();
    }

    public InterviewBrowser() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                    ex.printStackTrace();
                }

                DefaultMutableTreeNode root = new DefaultMutableTreeNode("Management");
                DefaultMutableTreeNode bigLeaf1 = new DefaultMutableTreeNode("Generl Affair");
                DefaultMutableTreeNode bigLeaf2 = new DefaultMutableTreeNode("Personal Affair");
                DefaultMutableTreeNode leaf2 = new DefaultMutableTreeNode(new InterviewHistory(
                                "Bob",
                                new Date(LocalDate.of(1972, Month.MARCH, 8).toEpochDay()),
                                Sex.MALE,
                                new Date(LocalDate.of(2015, Month.AUGUST, 10).toEpochDay()),
                                false,
                                "123456789"));
                DefaultMutableTreeNode leaf3 = new DefaultMutableTreeNode(new InterviewHistory(
                                "Jane",
                                new Date(LocalDate.of(1973, Month.JANUARY, 1).toEpochDay()),
                                Sex.FEMALE,
                                new Date(LocalDate.of(2015, Month.AUGUST, 10).toEpochDay()),
                                true,
                                "87654321"));

                bigLeaf1.add(leaf2);
                bigLeaf2.add(leaf3);
                root.add(bigLeaf1);
                root.add(bigLeaf2);
                DefaultTreeModel model = new DefaultTreeModel(root);

                JTree tree = new JTree(model);

                Viewer viewer = new Viewer();

                tree.addTreeSelectionListener(new TreeSelectionListener() {
                    @Override
                    public void valueChanged(TreeSelectionEvent e) {
                        TreePath path = e.getPath();
                        Object lastPathComponent = path.getLastPathComponent();
                        if (lastPathComponent instanceof DefaultMutableTreeNode) {
                            DefaultMutableTreeNode node = (DefaultMutableTreeNode) lastPathComponent;
                            Object userObject = node.getUserObject();
                            if (userObject instanceof InterviewHistory) {
                                InterviewHistory history = (InterviewHistory) userObject;
                                viewer.setHistory(history);
                            } else {
                                viewer.setHistory(null);
                            }
                        } else {
                            viewer.setHistory(null);
                        }
                    }
                });

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.add(new JScrollPane(tree), BorderLayout.WEST);
                frame.add(viewer);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public enum Sex {

        MALE,
        FEMALE
    }

    public class InterviewHistory {

        private String name;
        private Date birthDate;
        private Sex sex;
        private Date interviewDate;
        private boolean passed;
        private String phone;

        public InterviewHistory(String name, Date birthDate, Sex sex, Date interviewDate, boolean passed, String phone) {
            this.name = name;
            this.birthDate = birthDate;
            this.sex = sex;
            this.interviewDate = interviewDate;
            this.passed = passed;
            this.phone = phone;
        }

        public String getName() {
            return name;
        }

        public Date getBirthDate() {
            return birthDate;
        }

        public Sex getSex() {
            return sex;
        }

        public Date getInterviewDate() {
            return interviewDate;
        }

        public boolean didPass() {
            return passed;
        }

        public String getPhone() {
            return phone;
        }

        @Override
        public String toString() {
            return getName();
        }

    }

    public static class Viewer extends JPanel {

        public static final DateFormat DATE_FORMAT = DateFormat.getDateInstance();

        private JTextField name;
        private JTextField dateOfBirth;
        private JLabel sex;
        private JTextField dateOfInterview;
        private JCheckBox passed;
        private JTextField phone;

        public Viewer() {
            setLayout(new GridBagLayout());

            GridBagConstraints gbc = new GridBagConstraints();
            gbc.gridx = 0;
            gbc.gridy = 0;
            gbc.anchor = GridBagConstraints.WEST;

            add(new JLabel("Name: "), gbc);
            gbc.gridy++;
            add(new JLabel("Date of birth: "), gbc);
            gbc.gridy++;
            add(new JLabel("Sex: "), gbc);
            gbc.gridy++;
            add(new JLabel("Date of Interview: "), gbc);
            gbc.gridy++;
            add(new JLabel("Passed interview: "), gbc);
            gbc.gridy++;
            add(new JLabel("Phone: "), gbc);

            name = new JTextField(25);
            dateOfBirth = new JTextField(10);
            sex = new JLabel("?");
            dateOfInterview = new JTextField(10);
            passed = new JCheckBox();
            phone = new JTextField(9);

            gbc.gridx++;
            gbc.gridy = 0;

            add(name, gbc);
            gbc.gridy++;
            add(dateOfBirth, gbc);
            gbc.gridy++;
            add(sex, gbc);
            gbc.gridy++;
            add(dateOfInterview, gbc);
            gbc.gridy++;
            add(passed, gbc);
            gbc.gridy++;
            add(phone, gbc);

        }

        public void setHistory(InterviewHistory history) {
            name.setText(history == null ? null : history.getName());
            dateOfBirth.setText(history == null ? null : DATE_FORMAT.format(history.getBirthDate()));
            sex.setText(history == null ? "?" : history.getSex().name());
            dateOfInterview.setText(history == null ? null : DATE_FORMAT.format(history.getInterviewDate()));
            passed.setSelected(history == null ? false : history.didPass());
            phone.setText(history == null ? "?" : history.getPhone());
        }

    }
}

不要依赖 static 变量的状态，该状态很容易不反射(reflect)现实，而是依赖可以从 View /模型的状态确定的实际已知值。

任何模型的目的都是为您提供一种显示数据的机制，您应该使用它直接包装您的数据，而不是尝试猜测 UI 或模型的状态，然后单独查找数据(恕我直言)