Swing高级组件JList：动态增加删除list元素

动态增加list元素依靠ListModel类来实现。元素值通过properties文件的值保存，以分号间隔

	/**
	 * 添加邮箱地址按钮
	 * 
	 * **/
	private void jButton3ActionPerformed(ActionEvent evt) {
		String address = jTextField_addMail.getText().trim();
		
		if (!address.isEmpty()) {
			Vector<String> dataVector = new Vector<String>();
			ListModel listDataModel = mailAddrList.getModel();
			StringBuffer write2File = new StringBuffer();
			for (int i = 0; i < listDataModel.getSize(); i++) {
				String s = (String) listDataModel.getElementAt(i);
				dataVector.add(s);
				write2File = write2File.append(";" + s);
			}
			if (address != null && !address.isEmpty()) {
				dataVector.add(address);
				write2File.append(";" + address); //写进配置文件的字符串
			}
			while (write2File.toString().startsWith(";"))
				write2File = write2File.replace(0, 1, ""); //就是去掉";"
			mailAddrList.setListData(dataVector);

			SettingsAction.setProperty(path, "MailAddr", write2File
						.toString());
			JOptionPane.showMessageDialog(null, "添加并保存成功。", "提示",
						JOptionPane.INFORMATION_MESSAGE);
		}
	}

	/**
	 * 删除邮箱list选择项按钮动作
	 * 
	 * **/
	private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
		
		if (!mailAddrList.isSelectionEmpty()) {
			initMailAddrList();
			mailAddr = mailAddr.replace((String) mailAddrList.getSelectedValue(), "");
			while (mailAddr.contains(";;"))
				mailAddr = mailAddr.replace(";;", ";");
			try { //同步写入文件
				SettingsAction.setProperty(path, "MailAddr", mailAddr
						.startsWith(";") ? mailAddr.substring(1) : mailAddr);
			} catch (IOException e) {
				e.printStackTrace();
				JOptionPane.showMessageDialog(null, "发生未知错误，请重试。", "提示",
						JOptionPane.INFORMATION_MESSAGE);
			}
			Vector<String> dataVector = new Vector<String>();
			ListModel listDataModel = mailAddrList.getModel();
			for (int i = 0; i < listDataModel.getSize(); i++) {
				String s = (String) listDataModel.getElementAt(i);
				if (!((String) mailAddrList.getSelectedValue()).equals(s)) //排除所选项
					dataVector.add(s);
			}
			mailAddrList.setListData(dataVector);
			JOptionPane.showMessageDialog(null, "删除并保存成功。", "提示",
					JOptionPane.INFORMATION_MESSAGE);
		}
	}

	private JList mailAddrList;
	private JTextField jTextField_addMail;
	private String mailAddr;
	private Properties pros = new Properties();
	private String path = System.getProperty("user.dir")
			+ "\\src\\conf.properties";

初始化一些全局变量

	private void initMailAddrList() {
			FileInputStream fis = new FileInputStream(path);
			pros.load(fis);
			mailAddr = (String) pros.get("MailAddr");
			fis.close();
	}

初始化List通过一个匿名内部类实现：

		mailAddrList.setModel(AbstractListModel() {
			String[] strings = mailAddr.split(";");  

			public int getSize() {
				return strings.length;
			}

			public Object getElementAt(int i) {
				return strings[i];
			}
		});