如何在java中显示屏幕中心的图像 [英] How to display image at center of screen in java

问题描述

大家好，



我有一个关于java应用程序布局的问题，

我的框架顶部有一个菜单和一个jPanel布局是边框布局。

这个面板是主面板，在中心添加更多jPanel（组件面板也有布局是borderlayout）。

我创建了1个jLabel带图标是图片。



我的问题是如何在屏幕的中心（水平和垂直是中心）显示这张图片（尺寸可以改变）（我的框架） ）。





请帮帮我。



提前谢谢

Hi all,

I have a issue about layout in java application,
my frame have a menu on top and a jPanel with layout is border layout.
this panel is main panel and it is added more jPanel(component panel also has layout is borderlayout) at Center.
and I created 1 jLabel with icon is a picture.

My issue is how to display this picture(the size can change) at center(horizal and vertical are center) of screen(my frame).


please help me.

thank in advance

推荐答案

这个例子实现了你所描述的;

This example achieves what you''re describing;

package com.bornander.imagetest;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenuBar;
import javax.swing.JPanel;

public class MainWindow extends JFrame {
	
	private JMenuBar menuBar = new JMenuBar();
	private JPanel mainPanel = new JPanel();
	
	public MainWindow(String filename) throws IOException {
		Container contentPane = getContentPane();
		contentPane.setLayout(new BorderLayout());
		contentPane.add(menuBar, BorderLayout.NORTH);
		contentPane.add(mainPanel, BorderLayout.CENTER);
		
		menuBar.setBackground(Color.RED);
		menuBar.add(new JButton("Foo"));
		mainPanel.setBackground(Color.GREEN);
		mainPanel.setLayout(new BorderLayout());
		
		JLabel picLabel = new JLabel(new ImageIcon(ImageIO.read(new File(filename))));
		mainPanel.add(picLabel, BorderLayout.CENTER);
		
		setSize(320, 240);
		setVisible(true);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}

希望这会有所帮助，

Fredrik

Hope this helps,
Fredrik

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