如何从no-gui类实时更新Java Jframe控件 [英] How to update Java Jframe controls from no-gui class on real time

问题描述

我的Java JFrame项目有一个单调乏味的问题.

I have a tedious problem with my Java JFrame project.

我想做的(并寻找如何做的)是在不冻结我的应用程序的情况下，实时地从no-GUI类中将元素添加到我的ListBox中，换句话说就是异步".这清楚吗?我尝试了SwingWorker和Threads，但是没有结果.我所能做的就是在所有过程完成后更新列表框(显然，我的应用程序冻结了，因为我的过程很长).

What I want to do (and looking for how to) is add elements to my ListBox from a no-GUI class in REAL TIME, or in other words "asynchronous", with out freezing my app. Is this clear? I tried SwingWorker and Threads but without results. All I can do is update the listbox after all process finish (obviously with my app froze because my process is long).

这是我的体系结构:

这是我的代码(不起作用，只是为了理解)

And here is my code (not functional, just for understanding)

已编辑

视图(由NetBeans生成)

package view;

import com.everis.ingesta.controller.MyController;
import java.awt.event.ActionListener;
import javax.swing.DefaultListModel;
import javax.swing.JFrame;

public class MyView extends javax.swing.JFrame {

    public MyView(DefaultListModel<String> model) {
        setVisible(true);
    }

    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        btnRun = new javax.swing.JButton();
        jscrlLog = new javax.swing.JScrollPane();
        jlstLog = new javax.swing.JList();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        btnRun.setText("Run");

        jscrlLog.setViewportView(jlstLog);

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGap(159, 159, 159)
                .addComponent(btnRun)
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(jscrlLog, javax.swing.GroupLayout.DEFAULT_SIZE, 376, Short.MAX_VALUE)
                .addContainerGap())
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(btnRun)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jscrlLog, javax.swing.GroupLayout.DEFAULT_SIZE, 242, Short.MAX_VALUE)
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    public void addButtonListener(ActionListener listener) {
        btnRun.addActionListener(listener);
    }

    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(MyView.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(MyView.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(MyView.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(MyView.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
        //</editor-fold>
        //</editor-fold>
        //</editor-fold>

        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new MyController();
            }
        });


    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton btnRun;
    private javax.swing.JList jlstLog;
    private javax.swing.JScrollPane jscrlLog;
    // End of variables declaration                   
}

控制器

package controller;

import business.MyBusiness;
import util.MyLog;
import view.MyView;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class MyController {

    MyLog log;
    MyBusiness business;
    MyView view;

    public MyController(){
        log = new MyLog();
        business = new MyBusiness(log.getLog());
        view = new MyView(log.getLog());
    }

    public void runProcess() {
        view.addButtonListener(new ActionListener() { 
            @Override 
            public void actionPerformed(ActionEvent e) { 
                business.runProcess();
            }}
        );
    }
}

业务

package business;

import MyLog;
import java.util.List;
import javax.swing.DefaultListModel;
import javax.swing.SwingWorker;

public class MyBusiness {

    private int counter = 0;
    private DefaultListModel<String> model;
    private MyLog log;

    public MyBusiness(DefaultListModel<String> model) {
        this.model = model;a
    }

    public void runProcess() {
        SwingWorker<Void, String> worker = new SwingWorker<Void, String>() {
            @Override
            protected Void doInBackground() throws Exception {
                for (int i = 0; i < 10; i++) {
                    publish("log message number " + counter++);
                    Thread.sleep(2000);
                }

                return null;
            }

            @Override
            protected void process(List<String> chunks) {
                // this is called on the Swing event thread
                for (String text : chunks) {
                    model.addElement("");
                }
            }
        };
        worker.execute();
    }

}

日志(型号)

package util;

import javax.swing.DefaultListModel;

public class MyLog {

    private DefaultListModel<String> model;

    public MyLog() {
        model = new DefaultListModel<String>();
    }

    public DefaultListModel<String> getLog(){
        return model;
    }

}

推荐答案

这是一个长过程的过度简化示例，该过程生成String值并使用SwingWorker更新GUI.

This is an over-simplified example of a long-process generating String values that update GUI using a SwingWorker.

为了简化SwingWorker的基本用法，对其进行了过度简化.

It is over simplified in an attempt to make the basic use of a SwingWorker somewhat easier to follow.

这是一个文件 mcve ，这意味着您可以将整个代码复制粘贴到一个文件(MyView.java)中并执行:

This is a one-file mcve, meaning you can copy-paste the entire code into one file (MyView.java) and execute :

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionListener;
import java.util.List;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.SwingWorker;

//gui only, unaware of logic 
public class MyView extends JFrame {

    private JList<String> loglist;
    private JButton log;

    public MyView(DefaultListModel<String> model) {

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        log = new JButton("Start Process");
        add(log, BorderLayout.PAGE_START);
        loglist = new JList<>(model);
        loglist.setPreferredSize(new Dimension(200,300));

        add(loglist, BorderLayout.PAGE_END);
        pack();
        setVisible(true);
    }

    void addButtonListener(ActionListener listener) {
        log.addActionListener(listener);
    }

    public static void main(String args[]) {
        new MyController();
    }
}

//represents the data (and some times logic) used by GUI
class Model {

    private DefaultListModel<String> model;

    Model() {

        model = new DefaultListModel<>();
        model.addElement("No logs yet");
    }

    DefaultListModel<String> getModel(){
        return model;
    }
}

//"wires" the GUI, model and business process 
class MyController {

    MyController(){
        Model model = new Model();
        MyBusiness business = new MyBusiness(model.getModel());
        MyView view = new MyView(model.getModel());
        view .addButtonListener(e -> business.start());
    }
}

//represents long process that needs to update GUI
class MyBusiness extends SwingWorker<Void, String>{

    private static final int NUMBER_OF_LOGS = 9;
    private int counter = 0;
    private DefaultListModel<String> model;

    public MyBusiness(DefaultListModel<String> model) {
        this.model= model;
    }

    @Override  //simulate long process 
    protected Void doInBackground() throws Exception {

        for(int i = 0; i < NUMBER_OF_LOGS; i++) {

            //Successive calls to publish are coalesced into a java.util.List, 
            //which is by process.
            publish("log message number " + counter++);
            Thread.sleep(1000);
        }

        return null;
    }

    @Override
    protected void process(List<String> logsList) {
        //process the list received from publish
        for(String element : logsList) {
            model.addElement(element);
        }
    }

    void start() { 
        model.clear(); //clear initial model content 
        super.execute();
    }
}

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