我在动态更改 JLabel 中的图标时遇到了一些问题。首先,我要做的基本上是模拟屏幕共享操作。在客户端,我每秒都在截屏,然后将它们发送到服务器。在服务器端,我试图在一个简单的 GUI 中打开这些图片。
我可以毫无问题地发送图片,也可以毫无问题地获取它们。但是,我编写的 GUI 代码无法打开图片。更具体地说,如果有图片,它可以打开它,但它不会打开另一个已经来的图片。
我在服务器端所做的是,只要图片到达服务器,我就会用预定的名称保存它。然后我可以使用 Windows 自己的图片照片查看器打开图片。事实上,只要有新图片出现,照片查看器就会自行更新并显示新的屏幕截图。
但是,我无法在 JFrame 中打开屏幕截图。我编写了一个程序,以 jpg 格式截取屏幕截图,将它们发送到服务器,然后在 GUI 中打开它们。但是我在 GUI 部分打开时遇到问题。据我了解,它不会打开来自客户端的文件。
以下是我的代码,任何帮助将不胜感激。
服务器端,
package ScreenCap;
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/
import FileServer.*;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.ServerSocket;
import java.net.Socket;
import java.util.logging.Level;
import java.util.logging.Logger;
import test.TsgIcons;
/**
*
* @author busra
*/
public class ScreenCapServer extends Thread{
String filePath;
int portNumber;
FileServer screenCapServer;
ServerSocket getFileServer;
Socket getFile;
InputStream in;
FileOutputStream fileOutputStream;
TsgIcons screenShotIcons;
public ScreenCapServer(String path, int port) {
this.filePath = path;
this.portNumber = port;
this.screenShotIcons = new TsgIcons();
}
public static void waitTime(long millisecond){
long max = millisecond;
for(long i = 0; i < max; i++){
for(long j = 0; j < max; j++){
}
}
}
public void run() {
while(true) {
try {
for(int i = 0; i < 10; i++) {
getFileServer = new ServerSocket(portNumber);
getFile = getFileServer.accept();
in = getFile.getInputStream();
fileOutputStream = new FileOutputStream(filePath + "\\" + i + ".jpg");
byte [] buffer = new byte[64*1024];
int bytesRead = 0;
while ( (bytesRead = in.read(buffer)) != -1) {
fileOutputStream.write(buffer, 0, bytesRead);
}
in.close();
fileOutputStream.close();
getFileServer.close();
screenShotIcons.update();
}
} catch (IOException ex) {
ex.printStackTrace();
}
}
}
}
图形用户界面,
package test;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.Timer;
public class TsgIcons extends JFrame implements ActionListener {
protected Timer timer;
protected JLabel viewIcon;
private String[] SMILEY = {"orig_screen"};
private String BUTTON = "Button";
private int timeCount;
private int iconNumber;
private String image;
public TsgIcons() {
this(1, 100);
}
public TsgIcons(int initialTime, int delay) {
super("TSG Smileys");
this.timeCount = initialTime;
this.iconNumber = this.timeCount % this.SMILEY.length;
this.image = "TransferredScreenShots\\" + this.SMILEY[this.iconNumber] + ".jpg";
this.viewIcon = new JLabel();
this.viewIcon.setIcon(new javax.swing.ImageIcon(this.image));
this.timer = new Timer(delay, this);
this.init();
}
protected void init() {
JButton button = new JButton("Start / Stop");
button.setActionCommand(BUTTON);
button.addActionListener(this);
this.viewIcon.setHorizontalAlignment(JLabel.CENTER);
this.getContentPane().add(button, BorderLayout.SOUTH);
this.getContentPane().add(this.viewIcon, BorderLayout.CENTER);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocation(250, 250);
this.pack();
this.setVisible(true);
}
@Override
public void actionPerformed(ActionEvent e) {
if ( BUTTON.equals(e.getActionCommand()) ) { // test if the button clicked
if ( this.timer.isRunning() ) {
this.timer.stop();
} else {
this.timer.start();
}
} else
{ this.timeCount++;
this.iconNumber = this.timeCount % this.SMILEY.length;
this.image = "TransferredScreenShots\\" + this.SMILEY[this.iconNumber] + ".jpg";
this.viewIcon.setIcon(new javax.swing.ImageIcon(this.image));
}
}
public void update() {
this.timeCount++;
this.iconNumber = this.timeCount % this.SMILEY.length;
this.image = "TransferredScreenShots\\" + this.SMILEY[this.iconNumber] + ".jpg";
this.viewIcon.setIcon(new javax.swing.ImageIcon(this.image));
}
public static void main(String argv []) {
new TsgIcons();
}
}