JAVA：JProgressbar& Files.copy与1类中的Observer和Swingworker [英] JAVA: JProgressbar & Files.copy With Observer and Swingworker in 1 Class
问题描述
几个月前，我写了一篇文章：我的POST
但我想对一些更改我现在所有的代码是在Swingworker类中。但我想使用MVC方法，并使用观察者模式更新我的变量在视图中。
现在我有这样的
public class CopyFrame extends JFrame {
private JTextarea textArea;
private JProgresbar progresbar;
public CopyFrame（）{
progresbar = new JProgresbar
textArea = new JTextarea（）;
progresbar.setMaximum（100））;
/ *在这个方法中我正确添加组件* /
addComponentsCorrecty（）;
new Task（）。execute（）;
}
类任务扩展Swingworker< Void，Void> {
/ * Dp这10次* /
Files.Copy ）;
progresbar.setValue（progresbar.getValue + 10）;
String info = String.format（％s is completed，source）
textArea.setText（textArea.getText +\\\
+ info）
}
}
并且我想创建类似
public class CopyFrame extends JFrame {
private JTextarea textArea;
private JProgresbar progresbar;
public CopyFrame（）{
progresbar = new JProgresbar
textArea = new JTextarea（）;
progresbar.setMaximum（100））;
/ *在这个方法中我正确添加组件* /
addComponentsCorrecty（）;
任务task = new Task（）;
task.addObserver（this）;
task.execute
}
@Override
public void update（）{
progresbar.setValue（progresbar.getValue +10）;
textArea.setText（textArea.getText +\\\
+ task.getInfo）
}
}
class Task Swingworker< Void，Void> extends Observer {
private String info;
public Task（）{
doTask;
}
public void doTask（）{
/ * Dp这10次* /
Files.Copy（source，destination）;
info = String.format（％s is completed，source）
setChanged（）;
notifyObservers（）;
}
public String getInfo（）{
return info;
}
}
我该如何做？因为我不能从2类延伸。
我想从另一个类（TASK）更新progresbar
什么是我最好的选择
SwingWorker 提供了一种形式的观察者模式，形式为 PropertyChangeListener 。
这提供了有关状态更改（正在运行/已完成/等）和进度更改的通知。
示例：
- JProgressBar未进行
- 如何使用jProgressbar为ProcessBuilder过程？
- 如何在文件传输程序中包含进度条在java中使用套接字
- Java - 全局，可重用的加载对话框
- JProgressBar不会更新
有点累了重写 PropertyChangeListener ，我创建了一个简单的适配器，提供更多的直接事件通知
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.SwingWorker;
public class SwingWorkerListener< W extends SwingWorker>实现PropertyChangeListener {
@Override
public void propertyChange（PropertyChangeEvent evt）{
W worker =（W）evt.getSource（）;
switch（evt.getPropertyName（））{
casestate：
workerStateChanged（worker）;
switch（worker.getState（））{
case STARTED：
workerStarted（worker）;
break;
case DONE：
workerDone（worker）;
break;
}
break;
caseprogress：
workerProgressUpdated（worker）;
break;
}
}
protected void workerProgressUpdated（W worker）{
}
protected void workerStateChanged（W worker）{
}
protected void workerStarted（W worker）{
}
protected void workerDone（W worker）{
}
}
这允许我覆盖我实际感兴趣的方法，记住，Swing基础侦听器实际上是一种观察者模式的形式）;
$ b b
I wrote an aricle a couple months agoMY POST
but I want to make some changes to I. Now all my code is worked out in the Swingworker class. But I want to use the MVC methode and use the observer pattern to update my variables in the view.
Now i have something like this
public class CopyFrame extends JFrame {
private JTextarea textArea;
private JProgresbar progresbar;
public CopyFrame(){
progresbar = new JProgresbar
textArea = new JTextarea();
progresbar.setMaximum(100));
/*in this method I added the components correctly*/
addComponentsCorrecty();
new Task().execute();
}
class Task extends Swingworker<Void,Void>{
/*Dp this 10 times*/
Files.Copy(source, destination);
progresbar.setValue(progresbar.getValue + 10);
String info = String.format("%s is completed", source)
textArea.setText(textArea.getText + "\n" + info)
}
}
and i want to create something like this
public class CopyFrame extends JFrame {
private JTextarea textArea;
private JProgresbar progresbar;
public CopyFrame(){
progresbar = new JProgresbar
textArea = new JTextarea();
progresbar.setMaximum(100));
/*in this method I added the components correctly*/
addComponentsCorrecty();
Task task = new Task();
task.addObserver(this);
task.execute
}
@Override
public void update(){
progresbar.setValue(progresbar.getValue +10);
textArea.setText(textArea.getText + "\n" + task.getInfo)
}
}
class Task extends Swingworker<Void,Void> extends Observer{
private String info;
public Task(){
doTask;
}
public void doTask(){
/*Dp this 10 times*/
Files.Copy(source, destination);
info = String.format("%s is completed", source)
setChanged();
notifyObservers();
}
public String getInfo(){
return info;
}
}
How can I do this? because I can't extend from 2 classes. I want to update the progresbar from another class (TASK)
what Is my best option
SwingWorker provides a form of a observer pattern in the form of a PropertyChangeListener.
This provides notifications about the change in state (running/done/etc) and progress changes.
For example:
- JProgressBar isn't progressing
- How to use jProgress bar for ProcessBuilder process?
- how to include a progress bar in a program of file transfer using sockets in java
- Java - global, reusable loading dialog
- JProgressBar won't update
Getting a bit tired of re-writing the PropertyChangeListener, I did create a simple adapter which provided more direct event notification
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.SwingWorker;
public class SwingWorkerListener<W extends SwingWorker> implements PropertyChangeListener {
@Override
public void propertyChange(PropertyChangeEvent evt) {
W worker = (W) evt.getSource();
switch (evt.getPropertyName()) {
case "state":
workerStateChanged(worker);
switch (worker.getState()) {
case STARTED:
workerStarted(worker);
break;
case DONE:
workerDone(worker);
break;
}
break;
case "progress":
workerProgressUpdated(worker);
break;
}
}
protected void workerProgressUpdated(W worker) {
}
protected void workerStateChanged(W worker) {
}
protected void workerStarted(W worker) {
}
protected void workerDone(W worker) {
}
}
This allows me to override the methods that I'm actually interested and reduces the amount of repeated/boiler plate code I have to keep writing
Remember, the Swing bases "listeners" are actually a form of an observer pattern ;)
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