Java Swing程序设计实战

一、按钮组件

1.1 提交按钮组件

package swing;

import java.awt.*;
import java.awt.event.*;
import java.net.*;

import javax.swing.*;

public class JButtonTest extends JFrame {
	/**
	 *
	 */
	private static final long serialVersionUID = 1L;

	public JButtonTest() {
		URL url = JButtonTest.class.getResource("imageButton.jpg");
		Icon icon = new ImageIcon(url);
		setLayout(new GridLayout(3, 2, 5, 5)); // 设置网格布局管理器
		Container c = getContentPane(); // 创建容器
		for (int i = 0; i < 5; i++) {
			// 创建按钮，同时设置按钮文字与图标
			JButton J = new JButton("button" + i, icon);
			c.add(J); // 在容器中添加按钮
			if (i % 2 == 0) {
				J.setEnabled(false); // 设置其中一些按钮不可用
			}
		}
		JButton jb = new JButton(); // 实例化一个没有文字与图片的按钮
		jb.setMaximumSize(new Dimension(90, 30)); // 设置按钮与图片相同大小
		jb.setIcon(icon); // 为按钮设置图标
		jb.setHideActionText(true);
		jb.setToolTipText("图片按钮"); // 设置按钮提示为文字
		jb.setBorderPainted(false); // 设置按钮边界不显示
		jb.addActionListener(new ActionListener() { // 为按钮添加监听事件
			public void actionPerformed(ActionEvent e) {
				// 弹出确认对话框
				JOptionPane.showMessageDialog(null, "弹出对话框");
			}
		});
		c.add(jb); // 将按钮添加到容器中

		setTitle("创建带文字与图片的按钮");
		setSize(350, 150);
		setVisible(true);
		setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
	}

	public static void main(String args[]) {
		new JButtonTest();
	}
}

1.2 复选框组件

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class CheckBoxTest extends JFrame {

    /**
     *
     */
    private static final long serialVersionUID = 1L;
    private JPanel panel1 = new JPanel();
    private JPanel panel2 = new JPanel();
    private JTextArea jt = new JTextArea(3, 10);
    private JCheckBox jc1 = new JCheckBox("1");
    private JCheckBox jc2 = new JCheckBox("2");
    private JCheckBox jc3 = new JCheckBox("3");
    public CheckBoxTest() {
        Container c = getContentPane();

        c.setLayout(new BorderLayout());

        c.add(panel1, BorderLayout.NORTH);
        final JScrollPane scrollPane = new JScrollPane(jt);
        panel1.add(scrollPane);

        c.add(panel2, BorderLayout.SOUTH);
        panel2.add(jc1);
        jc1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (jc1.isSelected())
                    jt.append("复选框1被选中\n");
            }
        });

        panel2.add(jc2);
        jc2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (jc2.isSelected())
                    jt.append("复选框2被选中\n");
            }
        });

        panel2.add(jc3);
        jc3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                if (jc3.isSelected())
                    jt.append("复选框3被选中\n");
            }
        });

        setSize(200, 160);
        setVisible(true);
        setTitle("复选框的使用");
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
    }

    public static void main(String[] args) {
        new CheckBoxTest();

    }

}

二、列表组件

2.1 JComboBox类

import java.awt.*;
import javax.swing.*;

public class JComboBoxModelTest extends JFrame {
	private static final long serialVersionUID = 1L;
	JComboBox<String> jc = new JComboBox<>(new MyComboBox());
	JLabel jl = new JLabel("请选择证件");

	public JComboBoxModelTest() {
		setSize(new Dimension(160, 180));
		setVisible(true);
		setTitle("在窗口中设置下拉列表框");
		setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
		Container cp = getContentPane();
		cp.setLayout(new FlowLayout());
		cp.add(jl);
		cp.add(jc);
	}

	public static void main(String[] args) {
		new JComboBoxModelTest();

	}

}

class MyComboBox extends AbstractListModel<String> implements ComboBoxModel<String> {
	/**
	 *
	 */
	private static final long serialVersionUID = 1L;
	String selecteditem = null;
	String[] test = { "身份证", "军人证", "学生证", "工作证" };

	public String getElementAt(int index) {
		return test[index];
	}

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

	public void setSelectedItem(Object item) {
		selecteditem = (String) item;
	}

	public Object getSelectedItem() {
		return selecteditem;
	}

	public int getIndex() {
		for (int i = 0; i < test.length; i++) {
			if (test[i].equals(getSelectedItem()))
				return i;
		}
		return 0;
	}
}

2.2 列表框组件

import java.awt.*;

import javax.swing.*;

public class JListTest extends JFrame {
	/**
	 *
	 */
	private static final long serialVersionUID = 1L;

	public JListTest() {
		Container cp = getContentPane();

		cp.setLayout(null);
		JList<String> jl = new JList<>(new MyListModel());
		JScrollPane js = new JScrollPane(jl);
		js.setBounds(10, 10, 100, 100);
		cp.add(js);
		setTitle("在这个窗体中使用了列表框");
		setSize(200, 150);
		setVisible(true);
		setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
	}

	public static void main(String args[]) {
		new JListTest();
	}
}

class MyListModel extends AbstractListModel<String> {
	/**
	 *
	 */
	private static final long serialVersionUID = 1L;
	private String[] contents = { "列表1", "列表2", "列表3", "列表4", "列表5", "列表6" };

	public String getElementAt(int x) {
		if (x < contents.length)
			return contents[x++];
		else
			return null;
	}

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

三、文本组件

3.1 文本框组件

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class JTextFieldTest extends JFrame {

	/**
	 *
	 */
	private static final long serialVersionUID = 1L;

	public JTextFieldTest() {
		setSize(250, 100);
		setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
		Container cp = getContentPane();
		getContentPane().setLayout(new FlowLayout());
		final JTextField jt = new JTextField("aaa", 20);
		final JButton jb = new JButton("清除");
		cp.add(jt);
		cp.add(jb);
		jt.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				// TODO 自动生成方法存根
				jt.setText("触发事件");
			}
		});
		jb.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				jt.setText("");
				jt.requestFocus();
			}
		});
		setVisible(true);
	}

	public static void main(String[] args) {
		new JTextFieldTest();
	}
}

3.2 密码框

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class JTextFieldTest extends JFrame {

	/**
	 *
	 */
	private static final long serialVersionUID = 1L;

	public JTextFieldTest() {
		setSize(250, 100);
		setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
		Container cp = getContentPane();
		getContentPane().setLayout(new FlowLayout());
//		final JTextField jt=new JTextField("aaa",20);
		JPasswordField jp = new JPasswordField("", 20);
		jp.setEchoChar('*');
		final JButton jb = new JButton("清除");

		cp.add(jp);
		cp.add(jb);
		jp.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				// TODO 自动生成方法存根
				jp.setText("触发事件");
			}
		});
		jb.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				jp.setText("");
				jp.requestFocus();
			}
		});
		setVisible(true);
	}

	public static void main(String[] args) {
		new JTextFieldTest();
	}
}

3.3 文本域组件

import java.awt.*;
import javax.swing.*;

public class JTextAreaTest extends JFrame {
	public JTextAreaTest() {
		setSize(200, 100);
		setTitle("定义自动换行的文本域");
		setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		Container cp = getContentPane();
		JTextArea jt = new JTextArea("文本域", 6, 6);
		jt.setLineWrap(true);
		cp.add(jt);
		setVisible(true);
	}

	public static void main(String[] args) {
		new JTextAreaTest();

	}

}

四、常用时间监听器

4.1 动作事件监听器

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class SimpleEvent extends JFrame {

	/**
	 *
	 */
	private static final long serialVersionUID = 1L;
	private JButton jb = new JButton("我是按钮，点击我");

	public SimpleEvent() {
		setLayout(null);
		setSize(200, 100);
		setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
		Container cp = getContentPane();
		cp.add(jb);
		jb.setBounds(10, 10, 100, 30);
		jb.addActionListener(new jbAction());
		setVisible(true);
	}

	class jbAction implements ActionListener {
		public void actionPerformed(ActionEvent arg0) {
			jb.setText("我被单击了");
		}
	}

	public static void main(String[] args) {
		new SimpleEvent();
	}
}

4.2 焦点事件监听器

import java.awt.*;
import java.awt.event.*;

import javax.swing.*;

public class FocusEventTest extends JFrame {

	/**
	 *
	 */
	private static final long serialVersionUID = 1L;

	public FocusEventTest() {
		setSize(250, 100);
		setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
		Container cp = getContentPane();
		getContentPane().setLayout(new FlowLayout());

		final JLabel label = new JLabel();
		getContentPane().add(label);
		JTextField jt = new JTextField("请单击其他文本框", 10);
		JTextField jt2 = new JTextField("请单击我", 10);
		cp.add(jt);
		cp.add(jt2);
		jt.addFocusListener(new FocusListener() {
			// 组件失去焦点时调用的方法
			public void focusLost(FocusEvent arg0) {
				JOptionPane.showMessageDialog(null, "文本框失去焦点");
			}

			// 组件获取键盘焦点时调用的方法
			public void focusGained(FocusEvent arg0) {
			}
		});
		setVisible(true);
	}

	public static void main(String[] args) {
		new FocusEventTest();
	}

}

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