java awt 布局

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汗颜啊，昨天到今天写一个awt界面，布局差点把人恶心死，现在总算对这玩意有了一些眉目。

首先，布局大的分为2种，一种使用java awt 提供的布局来完成，这样做的好处就是在修改总体容器大小时候对整体布局影响很小，能够自动调整。另外一种就是不使用java 提供的布局管理，那么设置布局管理为null便可，但是没一个元件都需要自己定义大小位置，负责会显示不出来或者有问题，在前者布局管理器使用的是setPreferredSize设置的大小，其他都不管，后者使用的是setSize或者setBounds.

下面是我用java awt 的布局管理做的一个布局

import java.awt.BorderLayout;
import java.awt.Button;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.HeadlessException;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.WindowConstants;
import javax.swing.SpringLayout.Constraints;


public class DsGrid extends JFrame{

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		new DsGrid("OK");
	}

	public DsGrid(String arg0) throws HeadlessException {
		super(arg0);
		this.setSize(new Dimension(600, 500));
		this.createcomponent();
		this.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		this.setVisible(true);
	}
	
	private void createcomponent() {
		JPanel component=new JPanel();
		component.setSize(this.getWidth(),this.getHeight());
		component.setLayout(new BorderLayout());
		
		
		JPanel searchPanel=new JPanel();
		GridBagLayout searchgridbag = new GridBagLayout();
        GridBagConstraints searchc = new GridBagConstraints();

		searchPanel.setLayout(searchgridbag);
		JPanel conditionPanel=new JPanel();
		conditionPanel.setBackground(Color.red);
		
		GridBagLayout condBagLayout = new GridBagLayout();
        GridBagConstraints condConstraints = new GridBagConstraints();
        conditionPanel.setLayout(condBagLayout);
        
        Dimension lab_dimension=new Dimension(70, 30); 
        
        condConstraints.fill=GridBagConstraints.NONE;
        condConstraints.weighty=0.2;
        condConstraints.weightx=0.2;
		condConstraints.gridx=0;
		condConstraints.gridy=0;
		condConstraints.gridwidth=1;
		JLabel typeLable=new JLabel("Type",SwingConstants.RIGHT);
		typeLable.setPreferredSize(lab_dimension);
		condBagLayout.setConstraints(typeLable, condConstraints);
		conditionPanel.add(typeLable);
		
		condConstraints.gridy=1;
		JLabel nameLable=new JLabel("Name",SwingConstants.RIGHT);
		nameLable.setPreferredSize(lab_dimension);
		condBagLayout.setConstraints(nameLable, condConstraints);
		conditionPanel.add(nameLable);
		
		condConstraints.gridy=2;
		JLabel sLable=new JLabel("S..",SwingConstants.RIGHT);
		sLable.setPreferredSize(lab_dimension);
		condBagLayout.setConstraints(sLable, condConstraints);
		conditionPanel.add(sLable);
		
		condConstraints.gridy=3;
		JLabel descLable=new JLabel("Description",SwingConstants.RIGHT);
		descLable.setPreferredSize(lab_dimension);
		condBagLayout.setConstraints(descLable, condConstraints);
		conditionPanel.add(descLable);
		
		condConstraints.gridy=4;
		JLabel categoryLable=new JLabel("Category",SwingConstants.RIGHT);
		categoryLable.setPreferredSize(lab_dimension);
		condBagLayout.setConstraints(categoryLable, condConstraints);
		conditionPanel.add(categoryLable);
		
		condConstraints.gridy=0;
		condConstraints.gridx=2;
		condConstraints.gridwidth=4;
		condConstraints.weightx=0.6;
		condConstraints.fill=GridBagConstraints.HORIZONTAL;
		JComboBox typeComboBox=new JComboBox();
		condBagLayout.setConstraints(typeComboBox, condConstraints);
		conditionPanel.add(typeComboBox);
		
		Dimension query_combo_Dimension=new Dimension(120, 25);
		
		condConstraints.gridy=1;
		condConstraints.fill=GridBagConstraints.NONE;
		condConstraints.anchor=GridBagConstraints.WEST;
		condConstraints.gridx=2;
		condConstraints.gridwidth=1;
		condConstraints.weightx=0.0;
		typeComboBox=new JComboBox();
		typeComboBox.setPreferredSize(query_combo_Dimension);
		condBagLayout.setConstraints(typeComboBox, condConstraints);
		conditionPanel.add(typeComboBox);
		
		condConstraints.gridy=2;
		typeComboBox=new JComboBox();
		typeComboBox.setPreferredSize(query_combo_Dimension);
		condBagLayout.setConstraints(typeComboBox, condConstraints);
		conditionPanel.add(typeComboBox);
		
		condConstraints.gridy=3;
		typeComboBox=new JComboBox();
		typeComboBox.setPreferredSize(query_combo_Dimension);
		condBagLayout.setConstraints(typeComboBox, condConstraints);
		conditionPanel.add(typeComboBox);
		
		condConstraints.gridy=4;
		typeComboBox=new JComboBox();
		typeComboBox.setPreferredSize(query_combo_Dimension);
		condBagLayout.setConstraints(typeComboBox, condConstraints);
		conditionPanel.add(typeComboBox);
		
		condConstraints.gridx=3;
		JLabel nullLab=new JLabel("");
		nullLab.setPreferredSize(new Dimension(20, 20));
		condBagLayout.setConstraints(nullLab, condConstraints);
		conditionPanel.add(nullLab);
		
		condConstraints.fill=GridBagConstraints.HORIZONTAL;
		condConstraints.gridy=1;
		condConstraints.gridx=4;
		condConstraints.gridwidth=2;
		typeComboBox=new JComboBox();
		condBagLayout.setConstraints(typeComboBox, condConstraints);
		conditionPanel.add(typeComboBox);
		
		condConstraints.gridy=2;
		typeComboBox=new JComboBox();
		condBagLayout.setConstraints(typeComboBox, condConstraints);
		conditionPanel.add(typeComboBox);
		
		condConstraints.gridy=3;
		typeComboBox=new JComboBox();
		condBagLayout.setConstraints(typeComboBox, condConstraints);
		conditionPanel.add(typeComboBox);
		
		condConstraints.gridy=4;
		typeComboBox=new JComboBox();
		condBagLayout.setConstraints(typeComboBox, condConstraints);
		conditionPanel.add(typeComboBox);
		
		
		Dimension btn_Dimension=new Dimension(100, 30);
		condConstraints.fill=GridBagConstraints.NONE;
		condConstraints.anchor=GridBagConstraints.CENTER;
		condConstraints.gridx=6;
		condConstraints.gridy=0;
		condConstraints.gridwidth=1;
		condConstraints.weightx=0.2;
		JButton searchBtn=new JButton("Search");
		searchBtn.setPreferredSize(btn_Dimension);
		condBagLayout.setConstraints(searchBtn, condConstraints);
		conditionPanel.add(searchBtn);
		
		condConstraints.gridy=3;
		JButton selectAll=new JButton("SelectAll");
		selectAll.setPreferredSize(btn_Dimension);
		condBagLayout.setConstraints(selectAll, condConstraints);
		conditionPanel.add(selectAll);
		
		condConstraints.gridy=4;
		JButton Dselect=new JButton("SelectAll");
		Dselect.setPreferredSize(btn_Dimension);
		condBagLayout.setConstraints(Dselect, condConstraints);
		conditionPanel.add(Dselect);
		
		searchc.fill = GridBagConstraints.BOTH;
		searchc.gridwidth = GridBagConstraints.REMAINDER; 
		searchc.weightx = 1.0;
		searchc.weighty=0.2;
		searchgridbag.setConstraints(conditionPanel, searchc);
		searchPanel.add(conditionPanel);
		JPanel resultPanel=new JPanel();resultPanel.setBackground(Color.yellow);
		resultPanel.setLayout(new BorderLayout());
		JTable table=new JTable(1,4) ;
		resultPanel.add(table,BorderLayout.CENTER);
		searchc.weighty = 0.8;
        searchgridbag.setConstraints(resultPanel, searchc);
		searchPanel.add(resultPanel);

		
		
		
		component.add(searchPanel,BorderLayout.CENTER);
		
		JPanel okAndCancelPanel=new JPanel();
		okAndCancelPanel.setLayout(new FlowLayout(FlowLayout.CENTER));okAndCancelPanel.setBackground(Color.green);
		okAndCancelPanel.setSize(new Dimension(component.getWidth(), 30));
		okAndCancelPanel.add(new JButton("OK"));okAndCancelPanel.add(new JButton("OK"));
		component.add(okAndCancelPanel,BorderLayout.SOUTH);
		this.setContentPane(component);
	}
}