notepad.java

java实现的超强记事本

				String str1, str2, str3, str4, strA, strB;
				str1 = text.getText();
				str2 = str1.toLowerCase();
				str3 = field1.getText();
				str4 = str3.toLowerCase();

				// "区分大小写"的CheckBox被选中
				if (checkcase.isSelected()) {
					strA = str1;
					strB = str3;
				} else {
					strA = str2;
					strB = str4;
				}
				// 如果选择向下查找
				if (up.isSelected()) {
					// 假如没有选择某一段范围，就是在全部文本里进行查找，下同
					if (text.getSelectedText() == null) {
						a = strA.lastIndexOf(strB, FindStartPos - 1);
					}
					// 有选择段范围的情况，选择范围内的最后一个，下同
					else {
						a = strA.lastIndexOf(strB, FindStartPos
								- field1.getText().length() - 1);
					}
				}
				// 如果选择向下查找
				else if (down.isSelected()) {
					if (text.getSelectedText() == null) {
						a = strA.indexOf(strB, FindStartPos);
					} else {
						a = strA.indexOf(strB, FindStartPos
								- field1.getText().length() + 1);
					}
				}
				// 对查找到的字段进行选择
				if (a > -1) {
					if (up.isSelected()) {
						text.setCaretPosition(a);
						b = field1.getText().length();
						text.select(a, a + b);
					} else if (down.isSelected()) {
						text.setCaretPosition(a);
						b = field1.getText().length();
						text.select(a, a + b);
					}
				} else {
					JOptionPane.showMessageDialog(null, "对不起，查找不到指定内容！", "对不起",
							JOptionPane.INFORMATION_MESSAGE);
				}
			}
		});
		// 取消按钮事件，把查找对话框关闭
		cancelButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				searchDia.dispose();
			}
		});
		searchDia.show();
	}

	/**
	 * 处理替换的方法
	 */
	public void replace() {
		final JDialog replaceDia = new JDialog(this, "替换", true);
		replaceDia.setLocationRelativeTo(this);
		replaceDia.setSize(450, 250);
		replaceDia.setModalityType(Dialog.ModalityType.MODELESS);
		GridLayout gridlayout = new GridLayout(1, 2);
		replaceDia.setLayout(gridlayout);
		JPanel panel1 = new JPanel();
		Box box1 = Box.createVerticalBox();
		JPanel panel2 = new JPanel();
		JLabel label1 = new JLabel("查找内容(N)");
		final JTextField field1 = new JTextField(20);
		panel2.add(label1);
		panel2.add(field1);
		JPanel panel3 = new JPanel();
		JLabel label2 = new JLabel("    替换为(P)");
		final JTextField field2 = new JTextField(20);
		final JCheckBox checkcase = new JCheckBox("区分大小写(C)");
		ButtonGroup group = new ButtonGroup();
		final JRadioButton up = new JRadioButton("向上(U)");
		final JRadioButton down = new JRadioButton("向下(D)");
		down.setSelected(true);
		group.add(up);
		group.add(down);
		JPanel directionpanel = new JPanel();
		directionpanel.setBorder(BorderFactory.createTitledBorder("方向"));
		Box box = Box.createHorizontalBox();
		box.add(up);
		box.add(down);
		directionpanel.add(box);
		panel3.add(label2);
		panel3.add(field2);
		box1.add(panel2);
		box1.add(panel3);
		box1.add(directionpanel);
		box1.add(checkcase);
		panel1.add(box1);
		JPanel panel4 = new JPanel();
		Box box2 = Box.createVerticalBox();
		JButton searchnextButton = new JButton("查找下一个(F)");
		JButton replaceButton = new JButton("      替换(R)     ");
		JButton replaceAllButton = new JButton("  全部替换(A)  ");
		JButton cancelButton = new JButton("        取消         ");
		box2.add(searchnextButton);
		box2.add(Box.createVerticalStrut(10));
		box2.add(replaceButton);
		box2.add(Box.createVerticalStrut(10));
		box2.add(replaceAllButton);
		box2.add(Box.createVerticalStrut(10));
		box2.add(cancelButton);
		box2.add(Box.createVerticalStrut(10));
		panel4.add(box2);
		replaceDia.add(box1);
		replaceDia.add(box2);
		searchnextButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				int a = 0, b = 0;
				int FindStartPos = text.getCaretPosition();
				String str1, str2, str3, str4, strA, strB;
				str1 = text.getText();
				str2 = str1.toLowerCase();
				str3 = field1.getText();
				str4 = str3.toLowerCase();

				// "区分大小写"的CheckBox被选中
				if (checkcase.isSelected()) {
					strA = str1;
					strB = str3;
				} else {
					strA = str2;
					strB = str4;
				}
				if (up.isSelected()) {
					if (text.getSelectedText() == null) {
						a = strA.lastIndexOf(strB, FindStartPos - 1);
					} else {
						a = strA.lastIndexOf(strB, FindStartPos
								- field1.getText().length() - 1);
					}
				} else if (down.isSelected()) {
					if (text.getSelectedText() == null) {
						a = strA.indexOf(strB, FindStartPos);
					} else {
						a = strA.indexOf(strB, FindStartPos
								- field1.getText().length() + 1);
					}
				}
				if (a > -1) {
					if (up.isSelected()) {
						text.setCaretPosition(a);
						b = field1.getText().length();
						text.select(a, a + b);
					} else if (down.isSelected()) {
						text.setCaretPosition(a);
						b = field1.getText().length();
						text.select(a, a + b);
					}

				} else {
					JOptionPane.showMessageDialog(null, "对不起，查找不到指定内容！", "对不起",
							JOptionPane.INFORMATION_MESSAGE);
				}
			}
		});
		// 替换事件处理
		replaceButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				if (text.getSelectedText() == null) {
					int a = 0, b = 0;
					int FindStartPos = text.getCaretPosition();
					String str1, str2, str3, str4, strA, strB;
					str1 = text.getText();
					str2 = str1.toLowerCase();
					str3 = field1.getText();
					str4 = str3.toLowerCase();
					// "区分大小写"的CheckBox被选中
					if (checkcase.isSelected()) {
						strA = str1;
						strB = str3;
					} else {
						strA = str2;
						strB = str4;
					}
					if (up.isSelected()) {
						if (text.getSelectedText() == null) {
							a = strA.lastIndexOf(strB, FindStartPos - 1);
						} else {
							a = strA.lastIndexOf(strB, FindStartPos
									- field1.getText().length() - 1);
						}
					} else if (down.isSelected()) {
						if (text.getSelectedText() == null) {
							a = strA.indexOf(strB, FindStartPos);
						} else {
							a = strA.indexOf(strB, FindStartPos
									- field1.getText().length() + 1);
						}
					}
					if (a > -1) {
						if (up.isSelected()) {
							text.setCaretPosition(a);
							b = field1.getText().length();
							text.select(a, a + b);
						} else if (down.isSelected()) {
							text.setCaretPosition(a);
							b = field1.getText().length();
							text.select(a, a + b);
							// 注意，此步是关键！！！将所选中的字段替换为所需内容
							text.replaceSelection(field2.getText());
						}
					} else {
						JOptionPane.showMessageDialog(null, "对不起，查找不到指定内容！",
								"对不起", JOptionPane.INFORMATION_MESSAGE);
					}
				} else {
					text.replaceSelection(field2.getText());
				}
			}
		});
		// 替换全部事件处理
		replaceAllButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				text.setCaretPosition(0);
				int a = 0, b = 0, replaceCount = 0;
				// 这里使用while就是为了将所有满足条件的字段进行替换
				while (a > -1) {
					int FindStartPos = text.getCaretPosition();
					String str1, str2, str3, str4, strA, strB;
					str1 = text.getText();
					str2 = str1.toLowerCase();
					str3 = field1.getText();
					str4 = str3.toLowerCase();

					if (checkcase.isSelected()) {
						strA = str1;
						strB = str3;
					} else {
						strA = str2;
						strB = str4;
					}
					if (up.isSelected()) {
						if (text.getSelectedText() == null) {
							a = strA.lastIndexOf(strB, FindStartPos - 1);
						} else {
							a = strA.lastIndexOf(strB, FindStartPos
									- field1.getText().length() - 1);
						}
					} else if (down.isSelected())
						if (text.getSelectedText() == null) {
							a = strA.indexOf(strB, FindStartPos);
						} else {
							a = strA.indexOf(strB, FindStartPos
									- field1.getText().length() + 1);
						}

					if (a > -1) {
						if (up.isSelected()) {
							text.setCaretPosition(a);
							b = field1.getText().length();
							text.select(a, a + b);
						} else if (down.isSelected()) {
							text.setCaretPosition(a);
							b = field1.getText().length();
							text.select(a, a + b);
						}
					} else {
						if (replaceCount == 0) {
							JOptionPane.showMessageDialog(null,
									"对不起，查找不到指定内容！", "对不起",
									JOptionPane.INFORMATION_MESSAGE);
						} else {
							JOptionPane.showMessageDialog(null, "替换成功！共进行"
									+ replaceCount + "处替换", "替换成功",
									JOptionPane.INFORMATION_MESSAGE);
						}
					}
					if (field2.getText().length() == 0
							&& text.getSelectedText() != null) {
						text.replaceSelection("");
						replaceCount++;
					}

					if (field2.getText().length() > 0
							&& text.getSelectedText() != null) {
						text.replaceSelection(field2.getText());
						replaceCount++;
					}
				}// end while
			}
		});
		cancelButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				replaceDia.dispose();
			}
		});
		replaceDia.show();
	}

	/**
	 * 字体设置方法
	 */
	public void fontChooser() {
		int index = 0;
		final JDialog fontDia = new JDialog(this, "字体设置", true);
		fontDia.setLocationRelativeTo(this);
		fontDia.setModalityType(Dialog.ModalityType.MODELESS);
		doc = text.getStyledDocument(); // 获得JTextPane的Document
		fontDia.setSize(500, 400);
		Container c = fontDia.getContentPane();
		c.setLayout(new BorderLayout());
		JButton ok = new JButton("确定");
		ok.addActionListener(handler);
		JButton cancel = new JButton("退出");
		cancel.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				fontDia.dispose();
			}
		});
		// 调用系统支持的所有字体
		String[] str_name = GraphicsEnvironment.getLocalGraphicsEnvironment()
				.getAvailableFontFamilyNames();
		// 字体大小
		String[] str_Size = { "8", "10", "12", "14", "16", "18", "20", "22",
				"24", "26", "28", "30", "32", "34", "36", "38", "40" };
		// 字体样式
		String[] str_Style = { "常规", "斜体", "粗体", "粗斜体" };
		fontName = new JList(str_name); // 字体名称
		fontName.setVisibleRowCount(5);
		fontName.setFixedCellHeight(15);
		fontName.setFixedCellWidth(120);
		// 以下这步一定要做，打开字体对话框的时候选中的是现在文本所用的字体，假如不做这步，会出现异常
		for (int i = 0; i < str_name.length; i++) {
			if (str_name[i].equals(text.getFont().getFontName())) {
				index = i;
				break;
			}
		}
		fontName.setSelectedIndex(index);
		final JTextField fontnamefield = new JTextField(20);
		fontnamefield.setEditable(false);
		fontnamefield.setText(fontName.getSelectedValue().toString());
		fontName.addListSelectionListener(new ListSelectionListener() {
			public void valueChanged(ListSelectionEvent event) {
				// 为了使用户能更好的看预览的效果，将预览框里面的字设置成这个字体的名字，这样预览中就不会出现显示不了某些字的情况了）
				// 比如有些是英文字体，显示不了中文，假如预览框写"预览"二字，但是预览显示出来的会是乱七八糟的东西。用字体名字来预览是效果最好的。
				fontPreviewLabel
						.setText(fontName.getSelectedValue().toString());
				// 选择的结果实时更新，下同
				fontnamefield.setText(fontName.getSelectedValue().toString());
				// 此方法用来更新预览框的内容，下同
				preview();
			}
		});
		// 显示选择结果
		fontSize = new JList(str_Size); // 字号
		fontSize.setVisibleRowCount(5);
		fontSize.setFixedCellHeight(15);
		fontSize.setFixedCellWidth(120);
		// 以下这步一定要做，打开字体对话框的时候选中的是现在文本所用的字体大小，假如不做这步，会出现异常
		for (int i = 0; i < str_Size.length; i++) {
			if (str_Size[i].equals(Integer.toString(text.getFont().getSize()))) {
				index = i;
				break;
			}
		}
		fontSize.setSelectedIndex(index);
		final JTextField fontsizefield = new JTextField(20);
		fontsizefield.setEditable(false);
		fontsizefield.setText(str_Size[index]);
		fontSize.addListSelectionListener(new ListSelectionListener() {
			public void valueChanged(ListSelectionEvent event) {
				fontsizefield.setText(fontSize.getSelectedValue().toString());
				preview();
			}
		});
		// 显示选择结果
		fontStyle = new JList(str_Style); // 样式
		fontStyle.setVisibleRowCount(5);