我是Java GUI的新手,需要一些帮助。我正在开发一个应用程序,它从HDD加载图像并将其显示在下面输出中显示的第一个窗口中(所需的输出)。我不太确定在这种情况下使用的布局。试过GridBagLayout,但我似乎没有得到确切的输出。我需要一个2x3布局,其中第一行有3列由3个标签组成,名称为IMAGE,第二行的第一个单元由图像组成。我的问题是:
如何让图像单独显示在第二列的第一个单元格中
我添加了一个名为' Transform'的菜单项。在'选项1'菜单。如何编写代码,以便在'转换'单击MenuItem,第一个单元格(2x1)中的图像被清除并显示在第二个单元格(2x2)中。
我使用File类来处理Image加载和保存选项。好吗?我读过那里有一个' Image' AWT包中的类来处理图像数据,但我不太确定它的实现。
我在下方提供了我的代码......请帮忙!
import javax.swing.*;
import javax.swing.filechooser.FileNameExtensionFilter;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
class WorkingImage extends JFrame implements ActionListener
{
JMenuItem Open, Close, Save1, Save2, Save3, Transform1, Transform2;
JFileChooser choose;
JPanel panel;
Label l1, l2, l3;
/*public void myLayout()
{
panel.setLayout(new GridBagLayout());
GridBagConstraints gc = new GridBagConstraints();
}*/
WorkingImage(String title)
{
super(title);
//myLayout();
JMenuBar mbar = new JMenuBar();
setJMenuBar(mbar);
//File Menu, Open, Save, Close Menu Items
JMenu file = new JMenu("File");
mbar.add(file);
Open = new JMenuItem("Open");
Open.setMnemonic('O');
Open.addActionListener(this);
Close = new JMenuItem("Close");
Close.setMnemonic('E');
Close.addActionListener(this);
Save1 = new JMenuItem("Save");
Save1.setMnemonic('A');
Save1.addActionListener(this);
file.add(Open);
file.add(Save1);
file.add(Close);
//Creation of Option 1 and Option 2 Menus
JMenu opt1 = new JMenu("Option1");
mbar.add(opt1);
Transform1 = new JMenuItem("Transform");
Transform1.addActionListener(this);
Save2 = new JMenuItem("Save");
Save2.addActionListener(this);
opt1.add(Transform1);
opt1.add(Save2);
JMenu opt2 = new JMenu("Option2");
mbar.add(opt2);
Transform2 = new JMenuItem("Transform");
Transform2.addActionListener(this);
Save3 = new JMenuItem("Save");
Save3.addActionListener(this);
opt2.add(Transform2);
opt2.add(Save3);
//Set Frame Size
setSize(800, 600);
setVisible(true);
// Get the size of the screen
Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
// Determine the new location of the window
int w = getSize().width;
int h = getSize().height;
int x = (dim.width-w)/2;
int y = (dim.height-h)/2;
// Move the window
setLocation(x, y);
addWindowListener(new WindowAdapter()
{
@Override
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
});
}
@Override
public void actionPerformed(java.awt.event.ActionEvent e)
{
if(e.getSource() == Close)
{
System.out.println("\nApplication Terminated...");
System.exit(0);
}
else if(e.getSource() == Open)
{
choose = new JFileChooser();
choose.setDialogTitle("Specify a file to Open");
//Set File Extension filter
choose.setFileSelectionMode(JFileChooser.FILES_ONLY);
FileNameExtensionFilter filter = new FileNameExtensionFilter("jpeg, jpg, png files", "jpeg", "jpg", "png");
choose.setFileFilter(filter);
int userSelection = choose.showOpenDialog(this);
if(userSelection == JFileChooser.APPROVE_OPTION)
{
File fileToOpen = choose.getSelectedFile();
}
}
else if(e.getSource() == Save1)
{
choose = new JFileChooser();
choose.setDialogTitle("Specify a file to save");
//Set file extension filter
choose.setFileSelectionMode(JFileChooser.FILES_ONLY);
FileNameExtensionFilter filter = new FileNameExtensionFilter(".jpeg, .jpg and .png files", "jpeg", "jpg", "png");
choose.setFileFilter(filter);
int userSelection = choose.showSaveDialog(this);
if (userSelection == JFileChooser.APPROVE_OPTION)
{
File fileToSave = choose.getSelectedFile();
System.out.println("Save as file: " + fileToSave.getAbsolutePath());
}
}
else
{
}
}
}
class JavaImage
{
public static void main(String args[])
{
new WorkingImage("Image Display");
}
}
答案 0 :(得分:3)
看看这个实现。它将使用2个布局管理器。我使用了不同的组件。
public class SOAnswer extends JFrame{
private void initComponents(){
JPanel topPanel = new JPanel(new GridLayout(1, 3, 10, 10));// 1 row, 3 columns
topPanel.add(new JButton("IMAGE"));
topPanel.add(new JButton("IMAGE"));
topPanel.add(new JButton("IMAGE"));
JPanel bottomPanel = new JPanel(new GridLayout(1, 3, 10, 10));
bottomPanel.add(new JButton("CLICK ME"));
bottomPanel.add(new JButton("CLICK ME"));
bottomPanel.add(new JButton("CLICK ME"));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setExtendedState(getExtendedState() | JFrame.MAXIMIZED_BOTH);
setLayout(new BorderLayout(10, 10));
add(topPanel, BorderLayout.NORTH);
add(bottomPanel, BorderLayout.CENTER);
setVisible(true);
}
public static void main(String[]args){
SOAnswer go = new SOAnswer();
go.initComponents();
}
}
这是输出
这完全是关于布局的实验。