Swing开发时必定会碰到的11个问题及解决方案

1.JTable ，JTable如何在内容里面存放组件（下拉框，图片）和修改数据。

2.系统托盘TrayIcon的使用

3.JPopupMenu的使用

4.JTree的使用及替换样式

5.BorderLayout的灵活使用

6.进度条的同步读取和显示

7.滚动条下拉时候滚动条自动衍生

8.监听器、适配器的使用

9.如何直接把文件、文件夹拖拉到组件

10.剪切板的使用

11.JFM拓展包

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JTable放图片

package roy; import java.awt.Color; import java.awt.Component; import java.awt.Dimension; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.border.LineBorder; import javax.swing.event.TableModelEvent; import javax.swing.table.AbstractTableModel; import javax.swing.table.DefaultTableCellRenderer; import javax.swing.table.DefaultTableModel; import javax.swing.table.TableColumnModel; // public class MyTable{ JTable table=new JTable(); public MyTable(){ JFrame frame=new JFrame("测试jtable放图片"); frame.setLayout(null); table=this.getTable(); JScrollPane src=new JScrollPane(table); src.setBounds(0, 0, 400, 200); frame.setSize(new Dimension(400,200)); frame.add(src); frame.setVisible(true); } public JTable getTable(){ MyTableModel dm = new MyTableModel(); JTable table = new JTable(); table.setModel(dm);//设置每个单元格的格式 table.setDefaultRenderer(Icon.class, new ImageRenderer()); return table; } public static void main(String args[]){ new MyTable(); } } class MyTableModel extends AbstractTableModel{ private String[] columnNames = {"First Name", "Favorite Color", }; private Object[][] data = { {"Marry", new ImageIcon("1.gif") }, {"Joe",new ImageIcon("1.jpg") }, {"Kims", new ImageIcon("1.png") } }; public int getColumnCount() { return columnNames.length; } public int getRowCount() { return data.length; } public String getColumnName(int col) { return columnNames[col]; } public Object getValueAt(int row, int col) { return data[row][col]; } public Class getColumnClass(int c) { if(c==1){ System.out.println("---"+getValueAt(0, c).getClass()); } return c == 1 ? Icon.class : Object.class; } public boolean isCellEditable(int row, int col) { if (col < 1) { return false; } else { return true; } } public void setValueAt(Object value, int row, int col) { data[row][col] = value; fireTableCellUpdated(row, col); } }//定义 class ImageRenderer extends DefaultTableCellRenderer { public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) { setIcon(null); setBorder(null); System.out.println("++"+(value instanceof Icon)); super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column); if (value instanceof Icon) { this.setIcon((Icon) value); if (isSelected) setBorder(new LineBorder(Color.red)); }else if (value instanceof String) setText((String) value); else setText(""); return this; } } //设置图片和边框 class TextAndIcon { Icon icon; TextAndIcon(String text, ImageIcon icon) { this.text = text; this.icon = icon; } String text; public String getText() { return text; } public void setText(String text) { this.text = text; } public Icon getIcon() { return icon; } public void setIcon(ImageIcon icon) { this.icon = icon; } }

系统托盘和PopupMenu的使用

package roy; import java.awt.AWTException; import java.awt.MenuItem; import java.awt.PopupMenu; import java.awt.SystemTray; import java.awt.TrayIcon; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.ImageIcon; import javax.swing.JFrame; /** * Author:Roy */ public class TestTray extends JFrame implements Runnable { private SystemTray sysTray;// 当前操作系统的托盘对象 private TrayIcon trayIcon;// 当前对象的托盘 ImageIcon icon = null; public TestTray() { this.createTrayIcon();// 创建托盘对象 init(); } /** * 初始化窗体的方法 */ public void init() { this.setTitle("闪动托盘"); this.setSize(400, 400); this.setDefaultCloseOperation(this.EXIT_ON_CLOSE); this.setLocationRelativeTo(null); // 添加窗口事件,将托盘添加到操作系统的托盘 this.addWindowListener(new WindowAdapter() { public void windowIconified(WindowEvent e) { addTrayIcon(); } }); this.setVisible(true); } /** * 添加托盘的方法 */ public void addTrayIcon() { try { sysTray.add(trayIcon);// 将托盘添加到操作系统的托盘 setVisible(false);// 使得当前的窗口隐藏 new Thread(this).start(); } catch (AWTException e1) { e1.printStackTrace(); } } /** * 创建系统托盘的对象 步骤: 1,获得当前操作系统的托盘对象 2,创建弹出菜单popupMenu 3,创建托盘图标icon * 4,创建系统的托盘对象trayIcon */ public void createTrayIcon() { sysTray = SystemTray.getSystemTray();// 获得当前操作系统的托盘对象 icon = new ImageIcon("1.gif");// 托盘图标 PopupMenu popupMenu = new PopupMenu();// 弹出菜单 MenuItem mi = new MenuItem("弹出"); MenuItem exit = new MenuItem("关闭"); popupMenu.add(mi); popupMenu.add(exit); // 为弹出菜单项添加事件 mi.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { setVisible(true); sysTray.remove(trayIcon); } }); exit.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } }); trayIcon = new TrayIcon(icon.getImage(), "闪动托盘", popupMenu); } public static void main(String[] args) { TestTray testTray = new TestTray(); } /* * 线程控制闪动、替换图片 * */ public void run() { while (true) { this.trayIcon.setImage(new ImageIcon("2.jpg").getImage()); try { Thread.sleep(300); } catch (InterruptedException e) { e.printStackTrace(); } this.trayIcon.setImage(icon.getImage()); try { Thread.sleep(300); } catch (InterruptedException e) { e.printStackTrace(); } } } }

实现拖拉上传效果的界面

package roy; import java.awt.BorderLayout; import java.awt.datatransfer.DataFlavor; import java.awt.dnd.DnDConstants; import java.awt.dnd.DropTarget; import java.awt.dnd.DropTargetDragEvent; import java.awt.dnd.DropTargetDropEvent; import java.awt.dnd.DropTargetEvent; import java.awt.dnd.DropTargetListener; import java.io.File; import java.util.Iterator; import java.util.List; import java.util.Vector; import java.util.logging.Logger; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JProgressBar; import javax.swing.JScrollPane; import javax.swing.JTable; import javax.swing.table.JTableHeader; /** * * @author Roy * desc: 上传文件面板 */ public class UploadPane extends JPanel implements DropTargetListener{ private String[] columns={"文件名","路径","上传人"};//表格标题 private Vector data=new Vector();//表格数据 private JTable table;//上传表格 private MyTableModel model;//表格数据模型号 private Vector files=new Vector();//保存上传的文件路径 private String uploadName;//上传人的姓名 private JProgressBar jpb;//进度条 private UIFactory uiFactory=UIFactory.getInstance();//界面工厂 public UploadPane(String uploadName){ this.uploadName=uploadName; //创建一个拖放目标，本身 new DropTarget(this,DnDConstants.ACTION_COPY_OR_MOVE,this); jpb=uiFactory.createJProgressBar(0,100,0,true,true); this.setLayout(new BorderLayout()); model=new MyTableModel(columns,data); table=uiFactory.createJTable(model); JTableHeader header=table.getTableHeader(); header.setReorderingAllowed(false); JScrollPane sc=uiFactory.createJScrollPane(table); this.add(sc,BorderLayout.CENTER); this.add(jpb,BorderLayout.SOUTH); } public void drop(DropTargetDropEvent e) { try{ if(e.isDataFlavorSupported(DataFlavor.javaFileListFlavor)){ e.acceptDrop(DnDConstants.ACTION_COPY_OR_MOVE);//接受copy or move List list=(List)(e.getTransferable().getTransferData(DataFlavor.javaFileListFlavor)); Iterator it=list.iterator(); while(it.hasNext()){ File f=(File)it.next(); if(f.isFile()){ add(f); }else{ JOptionPane.showMessageDialog(this,"上传文件不能为文件夹"); } } e.dropComplete(true); this.updateUI(); }else{ e.rejectDrop(); } }catch(Exception ex){ ex.printStackTrace(); } } //提供一个添加数据的方法 public void add(File f){ jpb.setValue(0); Vector row=new Vector(); row.add(f.getName()); row.add(f.getPath()); row.add(uploadName); data.add(row); table.updateUI();//向表格添加数据 files.add(f); } //提共一个移除掉的方法 public void remove(){ data.clear(); files.clear(); table.updateUI(); } //getters and setters .... public String[] getColumns() { return columns; } public void setColumns(String[] columns) { this.columns = columns; } public Vector getData() { return data; } public void setData(Vector data) { this.data = data; } public JTable getTable() { return table; } public void setTable(JTable table) { this.table = table; } public MyTableModel getModel() { return model; } public void setModel(MyTableModel model) { this.model = model; } public JProgressBar getJpb() { return jpb; } public void setJpb(JProgressBar jpb) { this.jpb = jpb; } public String getUploadName() { return uploadName; } public void setUploadName(String uploadName) { this.uploadName = uploadName; } public Vector getFiles() { return files; } public void setFiles(Vector files) { this.files = files; } public void dragEnter(DropTargetDragEvent e) {} public void dragExit(DropTargetEvent e) {} public void dragOver(DropTargetDragEvent e) {} public void dropActionChanged(DropTargetDragEvent e) {} public static void main(String args[]){ JFrame f=new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); UploadPane p=new UploadPane("Joe"); f.add(p); f.pack(); f.setVisible(true); } }

 

最后再给大家一个UI的工厂来解决其他的问题，是平时常用的组件的创建（自动注册按钮、快捷键等），应有尽有。使用了单例模式。

 

package roy; import java.awt.BorderLayout; import java.awt.CardLayout; import java.awt.Color; import java.awt.Container; import java.awt.Dimension; import java.awt.FlowLayout; import java.awt.Font; import java.awt.GridLayout; import java.awt.MenuItem; import java.awt.event.ActionListener; import java.awt.event.ItemListener; import java.awt.event.WindowListener; import java.io.FileNotFoundException; import java.util.Vector; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JButton; import javax.swing.JCheckBox; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JList; import javax.swing.JMenuItem; import javax.swing.JPanel; import javax.swing.JPasswordField; import javax.swing.JProgressBar; import javax.swing.JRadioButton; import javax.swing.JScrollPane; import javax.swing.JSplitPane; import javax.swing.JTabbedPane; import javax.swing.JTable; import javax.swing.JTextArea; import javax.swing.JTextField; import javax.swing.JTextPane; import javax.swing.JToggleButton; import javax.swing.JToolBar; import javax.swing.KeyStroke; import javax.swing.event.ChangeListener; import javax.swing.event.ListSelectionListener; import javax.swing.table.AbstractTableModel; public class UIFactory { private static UIFactory instance;//当前工厂的一个实例 //私有的构造器 private UIFactory(){ } //获得当前工厂的实例 public static UIFactory getInstance(){ if(instance==null){ synchronized("key1"){ instance=new UIFactory(); } } return instance; } //产生一个标签 public JLabel createJLabel(String text){ JLabel l=new JLabel(text); return l; } //产生一个带图标的标签 public JLabel createJLabel(String text,Icon icon){ JLabel l=new JLabel(text); l.setIcon(icon); return l; } //专门产生按钮，而且添加快捷键 文本显示 命令 按键 辅助键 触发范围 监听器 是否显焦 public JButton createJButton(String text,int mn,String command,ImageIcon icon,int key_keyEvent,int input_inputEvent,int when_invoke_jComponent,ActionListener al,boolean isFocus){ JButton button=new JButton(text,icon); //这里默认会是alt+'mn' button.setMnemonic(mn);//设置辅助键 button.setActionCommand(command);//设置动作 button.addActionListener(al); KeyStroke stroke=KeyStroke.getKeyStroke(key_keyEvent,input_inputEvent,isFocus); button.registerKeyboardAction(al,command,stroke,when_invoke_jComponent); button.setFocusable(isFocus); return button; } //专门产生按钮 文本显示 命令 监听器 是否显焦 public JButton createJButton(String text,String command,ImageIcon icon,ActionListener al,boolean isFocus){ JButton button=new JButton(text,icon); button.setActionCommand(command);//设置动作 button.addActionListener(al);//添加事件监听 button.setFocusable(isFocus); return button; } //专门产生按钮，而且添加快捷键 文本显示 命令 按键 辅助键 触发范围 监听器 是否显焦 public JButton createJButton(String text,int mn,String command,ImageIcon icon,int width,int height,int key_keyEvent,int input_inputEvent,int when_invoke_jComponent,ActionListener al,boolean isFocus){ JButton button=new JButton(text,icon);//指定按钮的 文本和图片 //这里默认会是alt+'mn' a button.setMnemonic(mn);//设置辅助键 button.setActionCommand(command);//设置动作 【添加】 button.setPreferredSize(new Dimension(width,height));//指定按钮的大小 button.addActionListener(al); KeyStroke stroke=KeyStroke.getKeyStroke(key_keyEvent,input_inputEvent,isFocus); button.registerKeyboardAction(al,command,stroke,when_invoke_jComponent); button.setFocusable(isFocus); return button; } //专门产生按钮 文本显示 命令 监听器 是否显焦 public JButton createJButton(String text,String command,ImageIcon icon,int width,int height,ActionListener al,boolean isFocus){ JButton button=new JButton(text,icon); button.setActionCommand(command);//设置动作 button.setPreferredSize(new Dimension(width,height)); button.addActionListener(al);//添加事件监听 button.setFocusable(isFocus); return button; } //生成文本框 默认文本 文本框大小长 是否可编辑 public JTextField createJTextField(String text,int cols,boolean isEditable){ JTextField field=new JTextField(text,cols); field.setEditable(isEditable); return field; } //生成文本框 默认文本 文本框大小长 是否可编辑 设置字体 public JTextField createJTextField(String text,int cols,boolean isEditable,Font f){ JTextField field=new JTextField(text,cols); field.setEditable(isEditable); field.setFont(f); return field; } //生成文本域 默认文本 列数 行数 是否可编辑 public JTextArea createJTextArea(String text,int cols,int rows,boolean isEditable,boolean lineWrap,boolean wrapStyleWord){ JTextArea area=new JTextArea(text,cols,rows); area.setEditable(isEditable); area.setLineWrap(lineWrap); area.setWrapStyleWord(wrapStyleWord); return area; } //生成文本域 默认文本 列数 行数 是否可编辑 设置字体 public JTextArea createJTextArea(String text,int cols,int rows,boolean isEditable,boolean lineWrap,boolean wrapStyleWord,Font f){ JTextArea area=new JTextArea(text,cols,rows); area.setEditable(isEditable); area.setFont(f); area.setLineWrap(lineWrap); area.setWrapStyleWord(wrapStyleWord); return area; } //生成文本域 默认文本 列数 行数 是否可编辑 设置字体 背景颜色 前景颜色 public JTextArea createJTextArea(String text,int cols,int rows,boolean isEditable,Font f,boolean lineWrap,boolean wrapStyleWord,Color background, Color foreground){ JTextArea area=new JTextArea(text,cols,rows); area.setEditable(isEditable); area.setFont(f); area.setLineWrap(lineWrap); area.setWrapStyleWord(wrapStyleWord); area.setBackground(background); area.setForeground(foreground); return area; } //产生一个滚动面板 public JScrollPane createJScrollPane(Container c){ JScrollPane sc=new JScrollPane(c); return sc; } public static void main(String args[]){ UIFactory factory = UIFactory.getInstance(); //JScrollPane pan = factory.createJScrollPane(new JFrame(),JScrollPane.horizontalScrollBar,JScrollPane.verticalScrollBarPolicy); } //产生一个指定垂直和水平滚动策略的滚动面板 水平滚动策略 垂直滚动策略 public JScrollPane createJScrollPane(Container c,int horizontal_policy,int vertical_policy){ JScrollPane sc=new JScrollPane(); sc.setHorizontalScrollBarPolicy(horizontal_policy); sc.setVerticalScrollBarPolicy(vertical_policy); return sc; } //设置框架属性 传入的框架 关闭策略 x,y,width,height public void setJFrameAttributes(JFrame f,String title,int close_policy,int x,int y,int width,int height,boolean isResizable){ f.setTitle(title); f.setDefaultCloseOperation(close_policy); f.setLocation(x,y); f.setSize(width,height); f.setResizable(isResizable); } //设置框架属性 传入的框架 关闭策略 x,y,width,height public void setJFrameAttributes(JFrame f,String title,int close_policy,int x,int y,int width,int height,boolean isResizable,WindowListener wl){ f.setTitle(title); f.setDefaultCloseOperation(close_policy); f.setLocation(x,y); f.setSize(width,height); f.setResizable(isResizable); f.addWindowListener(wl); } //产生一条列表组件 条目宽度 public JList createJList(int cell_width){ JList list=new JList(); list.setFixedCellWidth(cell_width); return list; } //产生一条列表组件 条目宽度 列表选择监听器 public JList createJList(int cell_width,ListSelectionListener lsl){ JList list=new JList(); list.setFixedCellWidth(cell_width); list.addListSelectionListener(lsl); return list; } //产生一条列表组件 条目宽度 条目间距 源数据 public JList createJList(int cell_width,int cell_height,Vector