JAVA SWING图形界面编程

import javax.swing.*; import javax.swing.text.*; import java.awt.*; //为了实现布局管理 import java.awt.event.*; //为了处理事件处理 import java.net.URL; import java.io.IOException; public class TextSamplerDemo extends JFrame implements ActionListener { private String newline = "\n"; protected static final String textFieldString = "请输入用户名"; protected static final String passwordFieldString = "请输入密码"; protected JLabel actionLabel; public TextSamplerDemo() { super("TextSamplerDemo"); //创建一个单行文本区组件. JTextField textField = new JTextField(10); textField.setActionCommand(textFieldString); textField.addActionListener(this); //创建一个密码文本框. JPasswordField passwordField = new JPasswordField(10); passwordField.setActionCommand(passwordFieldString); passwordField.addActionListener(this); //创建一些标签. JLabel textFieldLabel = new JLabel(textFieldString + "："); textFieldLabel.setLabelFor(textField); JLabel passwordFieldLabel = new JLabel(passwordFieldString + "："); passwordFieldLabel.setLabelFor(passwordField); //创建一个标签用来存放事件处理消息. actionLabel = new JLabel("请在文本区组件中输入文字，然后按下回车键."); actionLabel.setBorder(BorderFactory.createEmptyBorder(10,0,0,0)); //对文本组件和标签进行布局管理. JPanel textControlsPane = new JPanel(); GridBagLayout gridbag = new GridBagLayout(); GridBagConstraints c = new GridBagConstraints(); textControlsPane.setLayout(gridbag); JLabel[] labels = {textFieldLabel, passwordFieldLabel}; JTextField[] textFields = {textField, passwordField}; addLabelTextRows(labels, textFields, gridbag, textControlsPane); c.gridwidth = GridBagConstraints.REMAINDER; //最后 c.anchor = GridBagConstraints.WEST; c.weightx = 1.0; gridbag.setConstraints(actionLabel, c); textControlsPane.add(actionLabel); textControlsPane.setBorder( BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder("文本区组件"), BorderFactory.createEmptyBorder(5,5,5,5))); //创建一个文本区域. JTextArea textArea = new JTextArea( "This is an editable JTextArea " + "that has been initialized with the setText method. " + "A text area is a \"plain\" text component, " + "which means that although it can display text " + "in any font, all of the text is in the same font." ); textArea.setFont(new Font("Serif", Font.ITALIC, 16)); textArea.setLineWrap(true); textArea.setWrapStyleWord(true); JScrollPane areaScrollPane = new JScrollPane(textArea); areaScrollPane.setVerticalScrollBarPolicy( JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); areaScrollPane.setPreferredSize(new Dimension(250, 250)); areaScrollPane.setBorder( BorderFactory.createCompoundBorder( BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder("普通文字"), BorderFactory.createEmptyBorder(5,5,5,5)), areaScrollPane.getBorder())); //创建一个编辑面板. JEditorPane editorPane = createEditorPane(); JScrollPane editorScrollPane = new JScrollPane(editorPane); editorScrollPane.setVerticalScrollBarPolicy( JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); editorScrollPane.setPreferredSize(new Dimension(250, 145)); editorScrollPane.setMinimumSize(new Dimension(10, 10)); //创建一个文本面板. JTextPane textPane = createTextPane(); JScrollPane paneScrollPane = new JScrollPane(textPane); paneScrollPane.setVerticalScrollBarPolicy( JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); paneScrollPane.setPreferredSize(new Dimension(250, 155)); paneScrollPane.setMinimumSize(new Dimension(10, 10)); //将可编辑文本框和文本框放在一个split pane组件中. JSplitPane splitPane = new JSplitPane(JSplitPane.VERTICAL_SPLIT, editorScrollPane, paneScrollPane); splitPane.setOneTouchExpandable(true); JPanel rightPane = new JPanel(); rightPane.add(splitPane); rightPane.setBorder(BorderFactory.createCompoundBorder( BorderFactory.createTitledBorder("多风格文字"), BorderFactory.createEmptyBorder(5,5,5,5))); //将所有的东西都放入applet中. JPanel leftPane = new JPanel(); BoxLayout leftBox = new BoxLayout(leftPane, BoxLayout.Y_AXIS); leftPane.setLayout(leftBox); leftPane.add(textControlsPane); leftPane.add(areaScrollPane); JPanel contentPane = new JPanel(); BoxLayout box = new BoxLayout(contentPane, BoxLayout.X_AXIS); contentPane.setLayout(box); contentPane.add(leftPane); contentPane.add(rightPane); setContentPane(contentPane); } private void addLabelTextRows(JLabel[] labels, JTextField[] textFields, GridBagLayout gridbag, Container container) { GridBagConstraints c = new GridBagConstraints(); c.anchor = GridBagConstraints.EAST; int numLabels = labels.length; for (int i = 0; i < numLabels; i++) { c.gridwidth = GridBagConstraints.RELATIVE; //倒数第二 c.fill = GridBagConstraints.NONE; //重新设置为默认值 c.weightx = 0.0; //重新设置为默认值 gridbag.setConstraints(labels[i], c); container.add(labels[i]); c.gridwidth = GridBagConstraints.REMAINDER; //最后一行 c.fill = GridBagConstraints.HORIZONTAL; c.weightx = 1.0; gridbag.setConstraints(textFields[i], c); container.add(textFields[i]); } } public void actionPerformed(ActionEvent e) { String prefix = "您输入了 \""; if (e.getActionCommand().equals(textFieldString)) { JTextField source = (JTextField)e.getSource(); actionLabel.setText(prefix + source.getText() + "\""); } else { JPasswordField source = (JPasswordField)e.getSource(); actionLabel.setText(prefix + new String(source.getPassword()) + "\""); } } private JEditorPane createEditorPane() { JEditorPane editorPane = new JEditorPane(); editorPane.setEditable(false); String s = null; try { s = "file:" + System.getProperty("user.dir") + System.getProperty("file.separator") + "TextSamplerDemoHelp.html"; URL helpURL = new URL(s); displayURL(helpURL, editorPane); } catch (Exception e) { System.err.println("Couldn't create help URL: " + s); } return editorPane; } private void displayURL(URL url, JEditorPane editorPane) { try { editorPane.setPage(url); } catch (IOException e) { System.err.println("Attempted to read a bad URL: " + url); } } private JTextPane createTextPane() { JTextPane textPane = new JTextPane(); String[] initString = { "This is an editable JTextPane, ", //正常 "another ", //斜体 "styled ", //粗体 "text ", //小 "component, ", //大 "which supports embedded components..." + newline,//正常