Java中的布局管理

Java中的布局管理

1．Java中的布局管理器经常用到的也就是三种（流布局管理器FlowLayout、边界布局管理器BorderLayout、网格布局管理器GridLayout），复杂的界面采用单一的布局管理器完成比较困难，一般（流布局管理器、边界布局管理器、网格布局管理器）三者相接合方式去完成。

2．先在草图上完成所需要布局及组件，再确定采用哪种布局管理器更合理。

3．一般情况下，先采用边界布局BorderLayout分区，再用网格布局GridLayout定位，后采用流式布局FlowLayout进行调整，对齐方式，水平，垂直方向间距.

4．先将组件进行流布局FlowLayout加到面板中，再将流面板添加到网格布局GridLayout面板中，后将网格面板添加到边界GridLayout面板中。

5．仔细阅读一下实例，对以后布局管理器应用有帮助。

6．参考下面实例：

7．package SerailComm;

8．import java.awt.*;

9．import java.awt.font.*;

10．import javax.swing.*;

11．import java.awt.color.*;

12．import javax.swing.JComponent;

13．public class SerailComm extends JFrame{

14．public SerailComm(){

15．String[]port={"COM1","COM2","CO3","COM4","COM5","COM6","COM7","CO M8","COM9","COM10"

16．,"COM11","COM12","COM13","COM14","COM15"};

17．String[]baud={"2400","4800","9600","115200","384000"};

18．String[]data={"6","7","8"};

19．String[]xor={"0","1","2"};

20．String[]stop={"0","1","1.5","2"};

21．//定义标签

22．JLabel lb_port=new JLabel("端口号:");

23．JLabel lb_baud=new JLabel("波特率:");

24．JLabel lb_data=new JLabel("数据位:");

25．JLabel lb_xor=new JLabel("校验位:");

26．JLabel lb_stop=new JLabel("停止位:");

27．lb_port.setHorizontalAlignment(SwingConstants.RIGHT);

28．lb_baud.setHorizontalAlignment(SwingConstants.RIGHT);

29．lb_data.setHorizontalAlignment(SwingConstants.RIGHT);

30．lb_xor.setHorizontalAlignment(SwingConstants.RIGHT);

31．lb_stop.setHorizontalAlignment(SwingConstants.RIGHT);

32．

33．//定义下拉列表框

34．JComboBox box_port=new JComboBox(port);

35．JComboBox box_baud=new JComboBox(baud);

36．JComboBox box_data=new JComboBox(data);

37．JComboBox box_xor=new JComboBox(xor);

38．JComboBox box_stop=new JComboBox(stop);

39．//定义面板

40．

41．//将北部面板定义为网格布局为1行1列

42．JPanel northPane = new JPanel();

43．northPane.setLayout(new GridLayout(1, 1));

44．//将定义左边的面板为网格布局为3行2列

45．JPanel leftPane = new JPanel();

46．leftPane.setOpaque(false);

47．leftPane.setLayout(new GridLayout(3, 2));

48．//定义流布局1

49．JPanel letflow = new JPanel();

50．FlowLayout flowlayout1=new FlowLayout(FlowLayout.LEFT,5,5); 51．letflow.setLayout(flowlayout1);

52．letflow.add(lb_port);

53．letflow.add(box_port);

54．//定义流布局2

55．JPanel lfpan = new JPanel();

56．FlowLayout flowlayout2=new FlowLayout(FlowLayout.LEFT,5,5); 57．lfpan.setLayout(flowlayout2);

58．lfpan.add(lb_baud);

59．lfpan.add(box_baud);

60．//定义流布局3

61．JPanel lfpan2= new JPanel();

62．FlowLayout flowlayout3=new FlowLayout(FlowLayout.LEFT,5,5); 63．lfpan2.setLayout(flowlayout3);

64．lfpan2.add(lb_data);

65．lfpan2.add(box_data);

66．//将3个流布局的面板，添加到3*2网格布局面板上67．leftPane.add(letflow);

68．leftPane.add(lfpan);

69．leftPane.add(lfpan2);

70．//定义右边的面板为网格布局为3行2列

71．JPanel rightPane = new JPanel();

72．rightPane.setOpaque(false);

73．rightPane.setLayout(new GridLayout(3, 2));

74．//定义流布局1

75．JPanel rightpan1=new JPanel();

76．FlowLayout rightflowlayout1 =new FlowLayout(FlowLayout.LEFT,5,5); 77．rightpan1.setLayout(rightflowlayout1);

78．rightpan1.add(lb_xor);

79．rightpan1.add(box_xor);

80．//定义流布2

81．JPanel rightpan2=new JPanel();