1. gridx,gridy 设置组件的位置：其实就是组件行列的设置，注意都是从0开始的，比如 gridx=0,gridy=1时放在0行1列。
2.gridwidth,gridheight—设置组件跨越的行列，默认值为1；GridBagConstraints.REMAINDER常量，代表此组件为此行或此列的最后一个组件，会占据所有剩余的空间。
3. weightx,weighty——用来设置窗口变大时，各组件跟着变大的比例。比如组件A的weightx=0.5，组件B的weightx=1，那么窗口X轴变大时剩余的空间就会以1：2的比例分配给组件A和B。
4.anchor — 当组件空间大于组件本身时，要将组件置于何处。 有CENTER(默认值)、NORTH、NORTHEAST、EAST、SOUTHEAST、WEST、NORTHWEST选择。
5.insets —— 设置组件之间彼此的间距。 它有四个参数，分别是上，左，下，右，默认为(0,0,0,0)。
好了，先看一下左右选择框的实现吧：
图片在上传的文件中．．．．
import java.awt.Dimension;import java.awt.GridBagConstraints;import java.awt.GridBagLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.BorderFactory;import javax.swing.DefaultListModel;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JList;import javax.swing.JPanel;import javax.swing.JTextField;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException;public class MyFrame extends JFrame { JPanel mainPanel = new JPanel(); JButton add = new JButton(); JButton left = new JButton(); JButton right = new JButton(); JLabel label = new JLabel(); JTextField field = new JTextField(); DefaultListModel leftModel = new DefaultListModel(); DefaultListModel rightMOdel = new DefaultListModel(); JList leftList = new JList(leftModel); JList rightList = new JList(rightMOdel); JPanel left_Right_Panel = new JPanel(); public MyFrame() { this.setTitle("test"); this.setPreferredSize(new Dimension(600, 400)); this.initComponent(); this.addData(); this.setVisible(true); this.pack(); } /** * 初始化组件 */ private void initComponent() { label.setText("添加选项："); add.setText("添加"); leftList.setPreferredSize(new Dimension(150, 150)); rightList.setPreferredSize(leftList.getPreferredSize()); left.setText("左"); right.setText("右"); mainPanel.setBorder(BorderFactory.createTitledBorder("左右选择框")); mainPanel.setLayout(new GridBagLayout()); GridBagConstraints c = new GridBagConstraints(); c.gridx = 0; // 0行0列 c.gridy = 0; c.gridwidth = 1; c.gridheight = 1; c.fill = GridBagConstraints.HORIZONTAL; c.weightx = 0; c.weighty = 0; mainPanel.add(label, c); c.gridx++; c.weightx = 1; mainPanel.add(field, c); c.gridx++; c.weightx = 0; c.gridwidth = 1; c.gridheight = 1; // c.fill = GridBagConstraints.HORIZONTAL; mainPanel.add(add, c); c.gridx = 0; c.gridy = 1; c.weightx = 1; c.weighty = 1; c.gridwidth = 2; c.gridheight = 2; c.fill = GridBagConstraints.BOTH; mainPanel.add(leftList, c); c.gridx = 2; c.gridy = 1; c.gridwidth = 1; c.gridheight = 1; c.weightx = 0; c.weighty = 0.5; c.anchor = GridBagConstraints.SOUTH; c.fill = GridBagConstraints.HORIZONTAL; mainPanel.add(left, c); c.gridx = 2; c.gridy = 2; c.anchor = GridBagConstraints.NORTH; c.fill = GridBagConstraints.HORIZONTAL; mainPanel.add(right, c); c.gridx = 3; c.gridy = 1; c.gridwidth = 1; c.gridheight = 2; c.weightx = 1; c.weighty = 1; c.fill = GridBagConstraints.BOTH; mainPanel.add(rightList, c); this.getContentPane().add(mainPanel); } private void addData() { add.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub addItem(); } }); left.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub leftItem(); } }); right.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub rightItem(); } }); } /** * 增加项 */ private void addItem() { if (field.getText() != null && !field.getText().equals("")) { ((DefaultListModel) leftList.getModel()) .addElement(field.getText()); field.setText(""); } } /** * 左移项 */ private void leftItem() { if (rightList.getSelectedIndex() != -1) { Object o = rightList.getSelectedValue(); ((DefaultListModel) rightList.getModel()).remove(rightList .getSelectedIndex()); ((DefaultListModel) leftList.getModel()).addElement(o); } } /** * 右移项 */ private void rightItem() { if (leftList.getSelectedIndex() != -1) { Object o = leftList.getSelectedValue(); ((DefaultListModel) leftList.getModel()).remove(leftList .getSelectedIndex()); ((DefaultListModel) rightList.getModel()).addElement(o); } } public static void main(String args[]) { try { UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InstantiationException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (UnsupportedLookAndFeelException e) { // TODO Auto-generated catch block e.printStackTrace(); } MyFrame frame = new MyFrame(); }}
相关资源：敏捷开发V1.0.pptx
