动态显示图片

[sj307639429]

在一个JFrame里用JLable显示图片，图片路径由监听按钮时通过FileDialog取得。路径去的无误但图片为什么不显示，高手们帮忙啊。源代码如下：

package org.jun.image;
import java.awt.*;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
public class ShowFileDialog extends JFrame{
static String filePath = null;//图片路径
Image image =null;
boolean thread = false; //线程控制
static ShowFileDialog dialog;

public ShowFileDialog() {
super("图片查看");
}

public void launchFrame() {
JButton jButt = new JButton("图片路径");

setLocation(200,100);
setSize(600,400);
add(jButt,BorderLayout.SOUTH); //添加按钮

dialog.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

jButt.addMouseListener(new MouseListener() { //监听Mouse点击事件
public void mouseClicked(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
}
public void mouseExited(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) { //鼠标放开时， 开始这里很正常，后来调试时不知道改了哪，只要选了一次文件，就会马上弹出个FileDialog的对话框
FileDialog fd = new FileDialog(dialog);

fd.setSize(400, 300);
fd.setVisible(true);

filePath = fd.getDirectory() + fd.getFile();
System.out.println(filePath);
thread = true;

dialog.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); }
}//end of class
);

this.setVisible(true);
}
public static void main(String[] args) {
dialog = new ShowFileDialog();
dialog.starts();
}

public void starts() {
dialog.launchFrame();
new Thread(new ImageThread("d")).start();
}

class ImageThread implements Runnable { //另起线程，当filePath改变时显示图片
private String s;
public ImageThread (String s) {
this.s = s;
}
public void run() {
while(thread) {
Image image =null;
try{
image=ImageIO.read(new File(filePath));
}catch(IOException ex){
System.out.println("文件路径错误");
}
JLabel label =new JLabel(new ImageIcon(image));
dialog.getContentPane().add(label, BorderLayout.NORTH);
dialog.setVisible(true);
pack();
}
}

}
}

[healer_kx]

请不要在线程里面操作UI。这个是原则问题。

[healer_kx]

大致改了一下，很多类名什么的没有动，虽然不合对象要表达的意义了。

import java.awt.*;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.io.*;
import javax.imageio.ImageIO;
import javax.swing.*;
import javax.swing.border.Border;

public class ShowFileDialog extends JFrame {
	static String filePath = null;// 图片路径
	Image image = null;
	boolean thread = false; // 线程控制
	static ShowFileDialog dialog;
	private JLabel label = null;

	public ShowFileDialog() {
		super("图片查看");
	}

	public void launchFrame() {
		JButton jButt = new JButton("图片路径");

		setLocation(200, 100);
		setSize(600, 400);
		add(jButt, BorderLayout.SOUTH); // 添加按钮
		label = new JLabel();
		label.setBackground(Color.BLACK);
		label.setBounds(new Rectangle(0, 0, 100, 100));
		dialog.add(label, BorderLayout.NORTH);
		dialog.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		jButt.addMouseListener(new MouseListener() { // 监听Mouse点击事件

					public void mouseReleased(MouseEvent e) { // 鼠标放开时，
																// 开始这里很正常，后来调试时不知道改了哪，只要选了一次文件，就会马上弹出个FileDialog的对话框
						FileDialog fd = new FileDialog(dialog);

						fd.setSize(400, 300);
						fd.setVisible(true);

						filePath = fd.getDirectory() + fd.getFile();
						System.out.println(filePath);
						new ImageThread("d").run();

						dialog.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
					}

					@Override
					public void mouseClicked(MouseEvent e) {
						// TODO Auto-generated method stub
						
					}

					@Override
					public void mouseEntered(MouseEvent e) {
						// TODO Auto-generated method stub
						
					}

					@Override
					public void mouseExited(MouseEvent e) {
						// TODO Auto-generated method stub
						
					}

					@Override
					public void mousePressed(MouseEvent e) {
						// TODO Auto-generated method stub
						
					}

				}// end of class
				);

		this.setVisible(true);
	}
	
	public JLabel getLabel() {
		return label;
	}

	public static void main(String[] args) {
		dialog = new ShowFileDialog();
		dialog.starts();
	}

	public void starts() {
		dialog.launchFrame();
		
	}
	
	

	class ImageThread implements Runnable { // 另起线程，当filePath改变时显示图片
		private String s;

		public ImageThread(String s) {
			this.s = s;
		}

		public void run() {
			if (true && filePath != null) {
				Image image = null;
				try {
					image = ImageIO.read(new File(filePath));
				} catch (IOException ex) {
					System.out.println("文件路径错误");
				}
				getLabel().setIcon(new ImageIcon(image));
				
				dialog.setVisible(true);
				pack();
			}
		}

	}
}

[zl3450341]

看楼上的代码

[sj307639429]

晕，发重了，我的分~~~

[sj307639429]

晕，发重了，我的分~~~