如何让你Swing程序不卡死？

来源：互联网发布：nginx openresty 编辑：程序博客网时间：2024/05/21 19:28

皮肤测试

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package myswingdemos;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Toolkit;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.UIManager;
import javax.swing.table.DefaultTableModel;

import org.jvnet.substance.skin.SubstanceBusinessBlueSteelLookAndFeel;
import org.jvnet.substance.skin.SubstanceOfficeBlue2007LookAndFeel;
import org.jvnet.substance.skin.SubstanceRavenGraphiteLookAndFeel;

public class MainFrame extends JFrame {

    private JMenuBar mainBar = new JMenuBar();
    private JMenu sysMenu = new JMenu("系统");
    private JMenuItem exitItem = new JMenuItem("退出");
    private JMenuItem loginItem = new JMenuItem("登陆");
    private JMenu aboutMenu = new JMenu("关于");
    private JMenuItem helpItem = new JMenuItem("帮助");

    private JPopupMenu popup = new JPopupMenu();
    private JMenuItem sendItem = new JMenuItem("发信息");
    private JMenuItem infoItem = new JMenuItem("看账户");
    private JMenuItem logoutItem = new JMenuItem("注销");

    private JTable table;
    private JScrollPane jspLogin;
    private JScrollPane jsplogTA;
    private JPanel displayPanel;
    private JPanel btnPanel;
    private JButton dispalyBtn;
    private JButton preBtn;
    private JButton nextBtn;

    public static DefaultTableModel defaultModel;
    public static JTextArea logTA;

    public MainFrame() {
        super("皮肤测试");
        setMainBar();
        setPanel();
        initFrame(600, 450);
    }

    private void initFrame(int frameWidth, int frameHeight) {
        setTitle("皮肤测试");
        Toolkit tk = Toolkit.getDefaultToolkit();
        Dimension screenDimension = tk.getScreenSize();
        int screenWidth = screenDimension.width;
        int screenHeight = screenDimension.height;
        setLocation((screenWidth - frameWidth) / 2,
                (screenHeight - frameHeight) / 2);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setSize(frameWidth, frameHeight);
        setVisible(true);
    }

    private void setMainBar() {

        setJMenuBar(mainBar);
        mainBar.add(sysMenu);
        mainBar.add(aboutMenu);
        sysMenu.add(loginItem);
        sysMenu.addSeparator();
        sysMenu.add(exitItem);
        aboutMenu.add(helpItem);
        popup.add(sendItem);
        popup.add(infoItem);
        popup.add(logoutItem);
    }

    private void setPanel() {
        String[][] playerInfo = new String[0][0];
        String[] names = { "用户", "登陆时间", "当前状态" };
        defaultModel = new DefaultTableModel(playerInfo, names);
        logTA = new JTextArea();
        logTA.setLineWrap(true);
        jsplogTA = new JScrollPane(logTA);
        table = new JTable(defaultModel);
        jspLogin = new JScrollPane(table);
        displayPanel = new JPanel();
        btnPanel = new JPanel();

        displayPanel.setLayout(new BorderLayout());
        displayPanel.add(jsplogTA, BorderLayout.CENTER);
        displayPanel.add(btnPanel, BorderLayout.SOUTH);

        dispalyBtn = new JButton("显示10条");
        preBtn = new JButton("向前10条");
        nextBtn = new JButton("向后10条");
        btnPanel.add(dispalyBtn);
        btnPanel.add(preBtn);
        btnPanel.add(nextBtn);
        jspLogin.setPreferredSize(new Dimension(600, 69));
        add(jspLogin, BorderLayout.NORTH);
        add(displayPanel, BorderLayout.CENTER);
    }


    public static void main(String[] args) {
        try {
//            new SubstanceOfficeBlue2007LookAndFeel()
//            org.jvnet.substance.skin.SubstanceRavenGraphiteLookAndFeel
//            UIManager.setLookAndFeel(new SubstanceBusinessBlueSteelLookAndFeel());
            JFrame.setDefaultLookAndFeelDecorated(true);
            UIManager.setLookAndFeel(new SubstanceOfficeBlue2007LookAndFeel());
        } catch (Exception e) {
            System.out.println("Substance Raven Graphite failed to initialize");
        }
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                MainFrame w = new MainFrame();
                w.setVisible(true);
            }
        });
    }
}

---------------------------------------

/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
package memorymaster;

import java.awt.AWTEvent;
import java.awt.event.WindowEvent;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

/**
*
* @author Administrator
*/
public class ScrollBottom extends JFrame{
private JTextArea ta = new JTextArea();
private Timer timer = new Timer();

    public ScrollBottom() {
        super();
        enableEvents(AWTEvent.WINDOW_EVENT_MASK);
        init();
    }

    private void init() {
        this.setBounds(0,0,300,150);
        final JScrollPane sp = new JScrollPane(ta);
        this.getContentPane().add(sp,"Center");
        ta.setText("Start.....\n");
        TimerTask task = new TimerTask(){
            public void run(){
                ta.append("Time: " + (System.currentTimeMillis() / 1000) + "\n");
                ta.setCaretPosition(ta.getText().length());
            }
        };
        timer.schedule(task, 0, 1000);
    }

    public void scrollAndSetCursor(){
        ta.setSelectionStart(ta.getText().length());
    }

     protected void processWindowEvent(WindowEvent e){
              super.processWindowEvent(e);
              if(e.getID() == WindowEvent.WINDOW_CLOSING)
              {
                   System.exit(0);
              }
     }
     public static void main(String[] args) {
        new ScrollBottom().setVisible(true);
    }
}

-----------------------------------------------

(1) 在JTextArea插入最后一条消息之后，使用selectAll()将光标强制移动到JTextArea的最后，实现滚动条的自动滚动。（Aviva中采用的方式）

(2) 在JTextArea插入最后一条消息之后，使用textArea.setCaretPosition(textArea.getText().length()),将光标移到最后，实现滚动条的自动滚动。

(3) 在JTextArea加载了自动滚动条JScroll之后，将JTextArea加入到JScrolPanel的ViewPort中: （有一些Bug，使得图像有点闪烁）
     recvScrollPane.getViewport().add(recvArea, null);
     然后在JTextArea插入最后一条新消息之后，将滚动条的Viewport重新设置到最底端的位置：
     int height = 10;
     Point p = new Point();
     p.setLocation(0, recvArea.getLineCount() * height);
     recvScrollPane.getViewport().setViewPosition(p);

（4）直接设置垂直滚动条的值

JScrollBar bar = pane.getVerticalScrollBar();
bar.setValue(20);

---------------------------------------------------

如何在JTree找到某一层中的所有节点？
   建立一个JTree的遍历，再通过next循环判断get那个node的path再getpathcount()判断==3，再把得到的节点存到一个什么容器里

   8。遍历树的所有节点<从根遍历或从某一个节点遍历>
public static void visitAllNodes(JTree tree) {
TreeNode root = (TreeNode) tree.getModel().getRoot();
visitAllNodes(tree,root);
}

public static void visitAllNodes(JTree tree,TreeNode node) {
// node is visited exactly once
//you can do your things about this node,such as:
tree.makeVisible(new TreePath(
((DefaultTreeModel)tree.getModel()).getPathToRoot(node)));

if (node.getChildCount() >= 0) {
   for (Enumeration e = node.children(); e.hasMoreElements();) {
    TreeNode n = (TreeNode) e.nextElement();
    visitAllNodes(tree,n);
   }
}
}
9。遍历树已经展开的节点<从根遍历或从某一个节点遍历>
// Traverse all expanded nodes in tree
public static void visitAllExpandedNodes(JTree tree) {
TreeNode root = (TreeNode) tree.getModel().getRoot();
visitAllExpandedNodes(tree, new TreePath(root));
}

public static void visitAllExpandedNodes(JTree tree, TreePath parent) {
// Return if node is not expanded
if (!tree.isVisible(parent)) {
return;
}

// node is visible and is visited exactly once
TreeNode node = (TreeNode) parent.getLastPathComponent();
//you can do your things about this node,such as:
System.out.println(node.toString());

// Visit all children
if (node.getChildCount() >= 0) {
   for (Enumeration e = node.children(); e.hasMoreElements();) {
    TreeNode n = (TreeNode) e.nextElement();
    TreePath path = parent.pathByAddingChild(n);
    visitAllExpandedNodes(tree, path);
   }
}
}