怎么才能时JComboBox的选项 随数据库的数据改变

掰po 2014-11-24 05:43:49
我建立一个JComboBox 初始化的时候已经 把数据绑定进去 然后再从JTextField中输入数据 通过JButton把JTextField中的值插入到JComboBox中 怎么才能插到JComboBox原有选项中的最后，并且让其显示出来， 我试过topicComboModel.addElement(topicField.getText().trim()); 在model里面插入 可以插入 但是不会显示 也试过topicCombo.addItem(topicField.getText().trim()); 也是选项不会变化还是原来刚初始化的选项新插入的选项没有显示
代码如下： 我简化了一下：（我所指的问题 在很多注释的地方 插入 button 的监听器中！）



package com.car.test;



import java.awt.*;

import java.awt.event.*;

import java.util.Date;

import java.util.List;

import java.util.ListIterator;



import javax.swing.*;

import javax.swing.border.*;



import com.car.dao.Dao;

import com.car.model.TbVote;

import com.car.util.*;



public class ComBoBoxTest{



	public static void main(String[] args)

	{

		EventQueue.invokeLater(new Runnable()

		{

			public void run()

			{

				JFrame frame = new ComBoBoxFrame();

				frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

				frame.setVisible(true);

			}

		});

	}

}



class ComBoBoxFrame extends JFrame

{

	public ComBoBoxFrame()

	{

		setTitle("ComBoBoxFrameTest");

		setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

		

		JPanel panel = new ComBoBox();

		add(panel);

	}

	

	private static final int DEFAULT_WIDTH = 750;

	private static final int DEFAULT_HEIGHT = 400;

	private static final long serialVersionUID = 1L;

}



//主要内容

class ComBoBox extends JPanel {

	

	public ComBoBox()

	{

		super();



		setSize(WIDTH, HEIGHT);

		setBackground(new Color(160, 160, 52));

		

		JPanel inPanel = new InPanel();

        JScrollPane scrollPane = new JScrollPane(inPanel);

        scrollPane.setPreferredSize(new Dimension(700, 700));

		scrollPane.setBorder(BorderFactory.createEmptyBorder());



		add(scrollPane);

	}

	

	private class InPanel extends JPanel

	{

		public InPanel()

		{

			super();

			

			setLayout(null);

			setOpaque(false);

			setSize(700, 360);

			

			card = new CardLayout();

			cardPanel = new JPanel(card);

			cardPanel.setOpaque(false);

			cardPanel.setBounds(0, 0, 700, 350);

			

			JPanel firstPanel = new FirstPanel();

			firstPanel.setName("first");

			cardPanel.add(firstPanel, "first");

			

			add(cardPanel);

			

			card.show(cardPanel, "first");

		}

		

		private class FirstPanel extends JPanel

		{

			public FirstPanel()

			{

				super();



				setLayout(null);

				setSize(700, 350);

				setBackground(new Color(160, 160, 52));



				setContent();

				ComBoBox.setContent();//初始化topicCombo的选项  方法在最下面 是静态方法

			}

			

			private void setContent()

			{

				JPanel panel = new JPanel();

				panel.setLayout(null);

				panel.setOpaque(false);

				panel.setBounds(25, 5, 650, 355);

				

				Font font = new MyFont().getFont();



				topicLabel = new JLabel("主题：", SwingConstants.RIGHT);

				topicLabel.setFont(font);

				topicLabel.setBounds(0, 0, 75, 25);

				topicField = new JTextField(25);

				topicField.setBounds(80, 0, 205, 25);

				topicInsertButton = new JButton("插入");

				topicInsertButton.addActionListener(new ActionListener()

				{

					public void actionPerformed(ActionEvent event)

					{

							if(topicField.getText() != null && topicField.getText() != "")

							{

								TbVote vote = new TbVote();

//								vote.setAdmiId(LoginFrame.user.getId());

								vote.setContentType("乘车投票");

								vote.setDurationTime(3);

								vote.setEstablishTime(ChangeDateTime.dateToStrLong(new Date()));

								vote.setParticipantNumber(0);

								vote.setPicture(null);

								vote.setTitle(topicField.getText().trim());

								if(Dao.addVote(vote))//往数据库里面写选项   接下来是想同时更新topicCombo 让其选项也随着增加新选项

									JOptionPane.showMessageDialog(null, "插入成功，请尽快写选项");

								//下面的方法我都试过  可以插入 但是topicCombo内的选项没变过

//								topicComboModel.removeAllElements();

//								topicComboModel.addElement(topicField.getText().trim());

//								topicCombo.setModel(topicComboModel);

//								topicComboModel.removeAllElements();

//								topicComboModel.addElement(topicField.getText().trim());

//								topicComboModel.insertElementAt(topicField.getText().trim(), 1);

//								topicCombo.setModel(topicComboModel);

//								topicCombo.setSelectedItem(topicField.getText().trim());

//								topicCombo.addItem(topicField.getText().trim());

	//							ComBoBox.setContent();

							}

					}

				});

				topicInsertButton.setFont(font);

				topicInsertButton.setFocusPainted(false);

				topicInsertButton.setBackground(Color.GREEN);

				topicInsertButton.setBounds(290, 0, 75, 25);

				topicCombo = new JComboBox<String>();

				topicComboModel = new DefaultComboBoxModel<String>(new String[]{"请选择"});

				topicCombo.setModel(topicComboModel);

				topicCombo.setFont(font);

				topicCombo.setFocusable(false);

				topicCombo.setBounds(370, 0, 200, 25);

				topicDeleteButton = new JButton("删除");

				topicDeleteButton.addActionListener(new ActionListener()

				{

					public void actionPerformed(ActionEvent event)

					{

						

					}

				});

				topicDeleteButton.setFont(font);

				topicDeleteButton.setFocusPainted(false);

				topicDeleteButton.setBackground(Color.RED);

				topicDeleteButton.setBounds(575, 0, 75, 25);



				JPanel questionPanel = new JPanel();

				Font titleFont = new MyFont().setSize(16).getFont();

				questionPanel.setLayout(null);

				questionPanel.setOpaque(false);

				questionPanel.setBounds(0, 30, 650, 140);

				questionPanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(), "问题", TitledBorder.LEFT, TitledBorder.DEFAULT_POSITION, titleFont));

				topicOkLabel = new JLabel("题目：", SwingConstants.RIGHT);

				topicOkLabel.setFont(font);

				topicOkLabel.setBounds(20, 15, 75, 25);

				topicOkCombo = new JComboBox<String>();

				topicOkComboModel = new DefaultComboBoxModel<String>(new String[]{"请选择"});

				topicOkCombo.setModel(topicOkComboModel);

				topicOkCombo.setFont(font);

				topicOkCombo.setFocusable(false);

				topicOkCombo.setBounds(100, 15, 300, 25);

				topicOkCombo.addActionListener(new ActionListener()

				{

					public void actionPerformed(ActionEvent event)

					{

						

					}

				});

				

				firstQuestionLabel = new JLabel("A选项：", SwingConstants.RIGHT);

				firstQuestionLabel.setFont(font);

				firstQuestionLabel.setBounds(5, 45, 60, 25);

				firstQuestionField = new JTextField(25);

				firstQuestionField.setBounds(70, 45, 250, 25);

				secondQuestionLabel = new JLabel("B选项：", SwingConstants.RIGHT);

				secondQuestionLabel.setFont(font);

				secondQuestionLabel.setBounds(325, 45, 60, 25);

				secondQuestionField = new JTextField(25);

				secondQuestionField.setBounds(385, 45, 250, 25);

				thirdQuestionLabel = new JLabel("C选项：", SwingConstants.RIGHT);

				thirdQuestionLabel.setFont(font);

				thirdQuestionLabel.setBounds(5, 75, 60, 25);

				thirdQuestionField = new JTextField(25);

				thirdQuestionField.setBounds(70, 75, 250, 25);

				fourthQuestionLabel = new JLabel("D选项：", SwingConstants.RIGHT);

				fourthQuestionLabel.setFont(font);

				fourthQuestionLabel.setBounds(325, 75, 60, 25);

				fourthQuestionField = new JTextField(25);

				fourthQuestionField.setBounds(385, 75, 250, 25);

				questionConfirmButton = new JButton("确定");

				questionConfirmButton.addActionListener(new ActionListener()

				{

					public void actionPerformed(ActionEvent event)

					{

						

					}

				});

				questionConfirmButton.setFont(font);

				questionConfirmButton.setFocusPainted(false);

				questionConfirmButton.setBackground(Color.GREEN);

				questionConfirmButton.setBounds(255, 105, 75, 25);

				questionPanel.add(topicOkLabel);

				questionPanel.add(topicOkCombo);

				questionPanel.add(firstQuestionLabel);

				questionPanel.add(firstQuestionField);

				questionPanel.add(secondQuestionLabel);

				questionPanel.add(secondQuestionField);

				questionPanel.add(thirdQuestionLabel);

				questionPanel.add(thirdQuestionField);

				questionPanel.add(fourthQuestionLabel);

				questionPanel.add(fourthQuestionField);

				questionPanel.add(questionConfirmButton);

				

				panel.add(topicLabel);

				panel.add(topicField);

				panel.add(topicInsertButton);

				panel.add(topicCombo);

				panel.add(topicDeleteButton);

				panel.add(questionPanel);

				add(panel);

			}

			

			private JLabel topicLabel;

			private JLabel topicOkLabel;

			private JLabel firstQuestionLabel;

			private JLabel secondQuestionLabel;

			private JLabel thirdQuestionLabel;

			private JLabel fourthQuestionLabel;

			private JTextField topicField;

			private JTextField firstQuestionField;

			private JTextField secondQuestionField;

			private JTextField thirdQuestionField;

			private JTextField fourthQuestionField;

			

		    private JButton topicInsertButton;

		    private JButton topicDeleteButton;

		    private JButton questionConfirmButton;

			private static final long serialVersionUID = 1L;

		}

		

		private static final long serialVersionUID = 1L;

	}

	

	public static void setContent()

	{

		List<TbVote> votes;

		votes = Dao.getVotes("乘车投票");

		

		if(votes.size() > 0)

		{

			ListIterator<TbVote> voteIter = votes.listIterator();

			String[] voteStrs = new String[votes.size() + 1];

			int i = 1;

			while(voteIter.hasNext())

			{

				voteStrs[i] = voteIter.next().getTitle();

				i++;

			}

			voteStrs[0] = "请选择";

			topicComboModel = new DefaultComboBoxModel<String>(voteStrs);

			topicOkComboModel = new DefaultComboBoxModel<String>(voteStrs);

		}

		topicCombo.setModel(topicComboModel);

		topicOkCombo.setModel(topicOkComboModel);

	}



	public static JComboBox<String> topicCombo;

    public static JComboBox<String> topicOkCombo;

	public static DefaultComboBoxModel<String> topicComboModel;

	public static DefaultComboBoxModel<String> topicOkComboModel;

	

	public static CardLayout card;

	public static JPanel cardPanel;

	private static final int WIDTH = 700;

	private static final int HEIGHT = 360;

	private static final long serialVersionUID = 1L;

}
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掰po 2014-11-25
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引用 1 楼 Holmes_Conan 的回复:
LZ，数据绑定，把数据源的数据绑定到该控件的相关属性！
问题解决了。 我原来数据已绑定，只是我用了静态JComboBox才无法更新 具体原因不知道 有人知道具体原因吗 请评论！晚点再结贴！
掰po 2014-11-24
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引用 1 楼 Holmes_Conan 的回复:
LZ，数据绑定，把数据源的数据绑定到该控件的相关属性！
具体应该怎么做？给多点提示~
福尔摩斯23 2014-11-24
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LZ，数据绑定，把数据源的数据绑定到该控件的相关属性！
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