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次のような情報を含む単一のメモ帳ファイルを調べるプログラムがあります。

Cardiff : 3245658

Bristol : 4726485

Manchester : 4728945

これらの場所と数字は自動システムから出ており、数字は約20秒ごとに変化します。番号が変更されたときにプログラムがメモ帳ファイルを振り返り、の番号を更新するように、ループを作成する必要があります（推測しています）。JTextField

PS私はすでにプログラムを作成しているので、ファイルを調べ、必要な情報を取得し、ArrayListを使用して正しい場所に配置します。

私が助けを必要としているのは、ファイルに変更があったときにコードを自動的に更新する方法だけです。これは、なんらかの方法を使用せずに行う必要がありJbuttonsます。それは、それ自体で行う必要があります。

現状の私のコード全体：

package window;

import java.awt.Color;
import java.awt.EventQueue;
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class MapTest {

    private JFrame frame;
    static JTextField txtCardiff;
    static JTextField txtBristol;
    static JTextField txtSheffield;
    static JTextField txtDerby;
    static JTextField txtGlasgow;
    static JTextField txtFalkirk;
    static JTextField txtNewcastle;
    static JTextField txtLeeds;
    static JTextField txtPreston;
    static JTextField txtManchester;
    static JTextField txtWolverhampton;
    static JTextField txtBirmingham;
    static JTextField txtMiltonKeynes;
    static JTextField txtPeterborough;
    static JTextField txtColindale;
    static JTextField txtStepneyGreen;
    static JTextField txtSlough;
    static JTextField txtFaraday;
    static JTextField txtGuildford;
    static JTextField txtSouthbank;

    static BufferedReader CSVFile = new BufferedReader(new FileReader
        ("C:/Users/606854007/workspace/NetworkAppTest/jar/window/Cardiff.txt"));
// putting static infront of this Br ' CSVFile' gives: 
//Unhandled exception type FileNotFoundException. 
//but when i take away the 'static' it causes a problem in the 'FileCheckerWorker' class.
// (Will comment where and what)

    ArrayList<String> csv = new ArrayList<String>();

    /**
    private String output = "";
    private String output1 = "";
    private String output2 = "";
    private String output3 = "";
    private String output4 = "";
    private String output5 = "";
    private String output6 = "";
    private String output7 = "";
    private String output8 = "";
    private String output9 = "";
    private String output10 = "";
    private String output11 = "";
    private String output12 = "";
    private String output13 = "";
    private String output14 = "";
    private String output15 = "";
    private String output16 = "";
    private String output17 = "";
    private String output18 = "";
    private String output19 = "";
    **/
    /** * Launch the application. */
    public static void main(String[] args) {
         try {
                UIManager.setLookAndFeel(
                            UIManager.getSystemLookAndFeelClassName());

            } catch (ClassNotFoundException e1) {
                e1.printStackTrace();

            } catch (InstantiationException e1) {
                e1.printStackTrace();

            } catch (IllegalAccessException e1) {
                e1.printStackTrace();

            } catch (UnsupportedLookAndFeelException e1) {
                e1.printStackTrace();
            }
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    MapTest window = new MapTest();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });

    }

    /**
     * Create the application.
     * 
     * @throws IOException
     */
    public MapTest() throws IOException {
        try {
            initialize();

        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    /**
     * Initialise the contents of the frame.
     * 
     * @param output
     * @throws IOException
     */

    private void initialize() throws IOException {

                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());
                csv.add(CSVFile.readLine());

                System.out.println(csv.get(0));
                System.out.println(csv.get(1));
                System.out.println(csv.get(2));
                System.out.println(csv.get(3));
                System.out.println(csv.get(4));
                System.out.println(csv.get(5));
                System.out.println(csv.get(6));
                System.out.println(csv.get(7));
                System.out.println(csv.get(8));
                System.out.println(csv.get(9));
                System.out.println(csv.get(10));
                System.out.println(csv.get(11));
                System.out.println(csv.get(12));
                System.out.println(csv.get(13));
                System.out.println(csv.get(14));
                System.out.println(csv.get(15));
                System.out.println(csv.get(16));
                System.out.println(csv.get(17));
                System.out.println(csv.get(18));
                System.out.println(csv.get(19));


        /**
         * JPanel container = new JPanel(); container.add(txtBirmingham);
         * container.add(txtBristol); container.add(txtCardiff);
         * container.add(txtColindale); container.add(txtDerby);
         * container.add(txtFalkirk); container.add(txtGlasgow);
         * container.add(txtGuildford); container.add(txtLeeds);
         * container.add(txtManchester); container.add(txtMiltonKeynes);
         * container.add(txtNewcastle); container.add(txtPeterborough);
         * container.add(txtPreston); container.add(txtSheffield);
         * container.add(txtSlough); container.add(txtSouthbank);
         * container.add(txtStepneyGreen); container.add(txtWolverhampton);
         * //container.add(); JScrollPane jsp = new JScrollPane(container);
         * frame.add(jsp);
         **/

        frame = new JFrame();
        frame.setBounds(0, 0, 1000, 1086);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);
        frame.setBackground(Color.CYAN);

        txtCardiff = new JTextField();
        txtCardiff.setText(csv.get(0));
        txtCardiff.setBackground(Color.GREEN);
        txtCardiff.setBounds(305, 699, 102, 20);
        frame.getContentPane().add(txtCardiff);
        txtCardiff.setColumns(10);

        txtBristol = new JTextField();
        txtBristol.setText(csv.get(1));
        txtBristol.setBackground(Color.GREEN);
        txtBristol.setBounds(416, 780, 102, 20);
        frame.getContentPane().add(txtBristol);
        txtBristol.setColumns(10);

        txtSheffield = new JTextField();
        txtSheffield.setText(csv.get(2));
        txtSheffield.setBackground(Color.GREEN);
        txtSheffield.setBounds(517, 356, 110, 20);
        frame.getContentPane().add(txtSheffield);
        txtSheffield.setColumns(10);

        txtDerby = new JTextField();
        txtDerby.setText(csv.get(3));
        txtDerby.setBackground(Color.GREEN);
        txtDerby.setBounds(582, 451, 90, 20);
        frame.getContentPane().add(txtDerby);
        txtDerby.setColumns(10);

        txtGlasgow = new JTextField();
        txtGlasgow.setText(csv.get(4));
        txtGlasgow.setBackground(Color.GREEN);
        txtGlasgow.setBounds(250, 94, 102, 20);
        frame.getContentPane().add(txtGlasgow);
        txtGlasgow.setColumns(10);

        txtFalkirk = new JTextField();
        txtFalkirk.setText(csv.get(5));
        txtFalkirk.setColumns(10);
        txtFalkirk.setBackground(Color.GREEN);
        txtFalkirk.setBounds(331, 41, 102, 20);
        frame.getContentPane().add(txtFalkirk);

        txtNewcastle = new JTextField();
        txtNewcastle.setText(csv.get(6));
        txtNewcastle.setColumns(10);
        txtNewcastle.setBackground(Color.GREEN);
        txtNewcastle.setBounds(424, 141, 111, 20);
        frame.getContentPane().add(txtNewcastle);

        txtLeeds = new JTextField();
        txtLeeds.setText(csv.get(7));
        txtLeeds.setColumns(10);
        txtLeeds.setBackground(Color.GREEN);
        txtLeeds.setBounds(481, 244, 102, 20);
        frame.getContentPane().add(txtLeeds);

        txtPreston = new JTextField();
        txtPreston.setText(csv.get(8));
        txtPreston.setColumns(10);
        txtPreston.setBackground(Color.GREEN);
        txtPreston.setBounds(356, 221, 102, 20);
        frame.getContentPane().add(txtPreston);

        txtManchester = new JTextField();
        txtManchester.setText(csv.get(9));
        txtManchester.setColumns(10);
        txtManchester.setBackground(Color.GREEN);
        txtManchester.setBounds(394, 394, 124, 20);
        frame.getContentPane().add(txtManchester);

        txtWolverhampton = new JTextField();
        txtWolverhampton.setText(csv.get(10));
        txtWolverhampton.setColumns(10);
        txtWolverhampton.setBackground(Color.GREEN);
        txtWolverhampton.setBounds(360, 486, 153, 20);
        frame.getContentPane().add(txtWolverhampton);

        txtBirmingham = new JTextField();
        txtBirmingham.setText(csv.get(11));
        txtBirmingham.setColumns(10);
        txtBirmingham.setBackground(Color.GREEN);
        txtBirmingham.setBounds(424, 553, 128, 20);
        frame.getContentPane().add(txtBirmingham);

        txtMiltonKeynes = new JTextField();
        txtMiltonKeynes.setText(csv.get(12));
        txtMiltonKeynes.setColumns(10);
        txtMiltonKeynes.setBackground(Color.GREEN);
        txtMiltonKeynes.setBounds(474, 604, 135, 20);
        frame.getContentPane().add(txtMiltonKeynes);

        txtPeterborough = new JTextField();
        txtPeterborough.setText(csv.get(13));
        txtPeterborough.setColumns(10);
        txtPeterborough.setBackground(Color.GREEN);
        txtPeterborough.setBounds(655, 576, 135, 20);
        frame.getContentPane().add(txtPeterborough);

        txtColindale = new JTextField();
        txtColindale.setText(csv.get(14));
        txtColindale.setColumns(10);
        txtColindale.setBackground(Color.GREEN);
        txtColindale.setBounds(541, 699, 107, 20);
        frame.getContentPane().add(txtColindale);

        txtStepneyGreen = new JTextField();
        txtStepneyGreen.setText(csv.get(15));
        txtStepneyGreen.setColumns(10);
        txtStepneyGreen.setBackground(Color.GREEN);
        txtStepneyGreen.setBounds(667, 699, 137, 20);
        frame.getContentPane().add(txtStepneyGreen);

        txtSlough = new JTextField();
        txtSlough.setText(csv.get(16));
        txtSlough.setColumns(10);
        txtSlough.setBackground(Color.GREEN);
        txtSlough.setBounds(525, 756, 102, 20);
        frame.getContentPane().add(txtSlough);

        txtFaraday = new JTextField();
        txtFaraday.setText(csv.get(17));
        txtFaraday.setColumns(10);
        txtFaraday.setBackground(Color.GREEN);
        txtFaraday.setBounds(650, 756, 102, 20);
        frame.getContentPane().add(txtFaraday);

        txtGuildford = new JTextField();
        txtGuildford.setText(csv.get(18));
        txtGuildford.setColumns(10);
        txtGuildford.setBackground(Color.GREEN);
        txtGuildford.setBounds(525, 822, 102, 20);
        frame.getContentPane().add(txtGuildford);

        txtSouthbank = new JTextField();
        txtSouthbank.setText(csv.get(19));
        txtSouthbank.setColumns(10);
        txtSouthbank.setBackground(Color.GREEN);
        txtSouthbank.setBounds(655, 807, 115, 20);
        frame.getContentPane().add(txtSouthbank);

        JLabel lblNewLabel = new JLabel("New label");
        lblNewLabel.setForeground(Color.BLACK);
        lblNewLabel.setBackground(Color.BLACK);
        lblNewLabel
                .setIcon(new ImageIcon(
                        "C:\\Users\\606854007\\workspace\\NetworkAppTest\\Test\\window\\England_Wales.gif"));
        lblNewLabel.setBounds(33, 11, 890, 1086);
        frame.getContentPane().add(lblNewLabel);

        new FileCheckerWorker(null).execute();
\\ if i dont but null in the '()' then it comes up with an error, 
\\and this just makes it execute:
    /**
public FileCheckerWorker(MapTest mapTest) {
        this.mapTest = mapTest;
    }
**/
\\ which is not what I want, I have tried to add commands 
\\to run the methods from within:
\\ ' public FileCheckerWorker(MapTest mapTest)' method
\\ but it gives me a null pointer exception,


}

    }

以下は、私が正しく実行したことを期待する「FileCheckerWorker」クラスです：p

package window;

import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;
import javax.swing.SwingWorker;


public class FileCheckerWorker extends SwingWorker<Object, List<String>> {

    private MapTest mapTest;

    public FileCheckerWorker(MapTest mapTest) {
        this.mapTest = mapTest;
    }


        @Override
        protected void process(List<List<String>> chunks) {
           List<String> values = chunks.get(chunks.size() - 1);

           mapTest.txtCardiff.setText(values.get(0));
           mapTest.txtBristol.setText(values.get(1));
           mapTest.txtSheffield.setText(values.get(2));
           mapTest.txtDerby.setText(values.get(3));
           mapTest.txtGlasgow.setText(values.get(4));
           mapTest.txtFalkirk.setText(values.get(5));
           mapTest.txtNewcastle.setText(values.get(6));
           mapTest.txtLeeds.setText(values.get(7));
           mapTest.txtPreston.setText(values.get(8));
           mapTest.txtManchester.setText(values.get(9));
           mapTest.txtWolverhampton.setText(values.get(10));
           mapTest.txtBirmingham.setText(values.get(11));
           mapTest.txtMiltonKeynes.setText(values.get(12));
           mapTest.txtPeterborough.setText(values.get(13));
           mapTest.txtColindale.setText(values.get(14));
           mapTest.txtStepneyGreen.setText(values.get(15));
           mapTest.txtSlough.setText(values.get(16));
           mapTest.txtFaraday.setText(values.get(17));
           mapTest.txtGuildford.setText(values.get(18));
           mapTest.txtSouthbank.setText(values.get(19));
        }

        @Override
        protected Object doInBackground() throws Exception {
            long lastUpdated = -1;
            File csvFile = new File("C:/Users/606854007/workspace/NetworkAppTest/Jar/window/Cardiff.txt");
            while (true) {
                if (csvFile.lastModified() != lastUpdated) {
                    BufferedReader csvReader = null;
                    List<String> values = new ArrayList<String>(20);
                    try {
                        csvReader = new BufferedReader(new FileReader("C:/Users/606854007/workspace/NetworkAppTest/Jar/window/Cardiff.txt"));
                        for (int index = 0; index < 20; index++) {
                            values.add(mapTest.CSVFile.readLine());
                        }
                        publish(values);
                        lastUpdated = csvFile.lastModified();
                    } finally {
                        try {
                            csvReader.close();
                        } catch (Exception e) {
                        }
                    }

                    Thread.sleep(5000);
                    System.out.println("Check For Change");
                }
            }
        }

}

両方のコードを現在の状態に更新しました。

また、行values.add（mapTest.CSVFile.readLine（））;でNullPointerExceptionが発生した場合、「doInBackground」が機能していると思ったとき。

4

2 に答える 2

1

「ルックアップ」コードをでラップし、バックグラウンドスレッドが特定の期間（たとえば20秒）アイドル状態になるようにするためSwingWorkerに使用します。Thread.sleep

ファイルの内容をロードし、ファイルが変更されているかどうかを判断し、メソッドを使用しpusblishて結果をメソッドに送信しますprocess。これにより、イベントディスパッチスレッドを使用して結果を処理できます。

詳細については、SwingWorkerをご覧ください

簡単な例

public class PeriodicalWorker extends SwingWorker<Object, String> {
    private boolean running = true;

    public Object doInBackground() throws Exception {
        while (running) {
            try {
                Thread.sleep(20000);
            } catch (Exception exp) {}
            // Load the values...
            // Check to see if anything needs to updated...
            publish(values); // List of String array values
        }
        return null;
    }

    public void process(List<String> values) {
        // Assign the values to the UI...
    }
}

running「停止」メソッドをfalseに設定できると確信しています;）

更新しました

基本的な考え方はとてもシンプルです。ファイルが最後に更新された時刻を追跡する必要があります。スリープ間で値が変更された場合は、ファイルを再読み込みして画面上の値を更新する必要があります。

このプロセスはJava7でかなり簡単になりましたが、その前にFile#lastModified、ファイルの最終変更日時を確認するために使用できました。

以下は簡単な例です。

public class FileCheckerWorker extends SwingWorker<Object, List<String>> {

    @Override
    protected void process(List<List<String>> chunks) {
        List<String> values = chunks.get(chunks.size() - 1);

        txtCardiff.setText(values.get(0));
        txtBristol.setText(values.get(1));
        txtSheffield.setText(values.get(2));
        txtDerby.setText(values.get(3));
        txtGlasgow.setText(values.get(4));
        txtFalkirk.setText(values.get(5));
        txtNewcastle.setText(values.get(6));
        txtLeeds.setText(values.get(7));
        txtPreston.setText(values.get(8));
        txtManchester.setText(values.get(9));
        txtWolverhampton.setText(values.get(10));
        txtBirmingham.setText(values.get(11));
        txtMiltonKeynes.setText(values.get(12));
        txtPeterborough.setText(values.get(13));
        txtColindale.setText(values.get(14));
        txtStepneyGreen.setText(values.get(15));
        txtSlough.setText(values.get(16));
        txtFaraday.setText(values.get(17));
        txtGuildford.setText(values.get(18));
        txtSouthbank.setText(values.get(19));
    }

    @Override
    protected Object doInBackground() throws Exception {
        long lastUpdated = -1;
        File csvFile = new File("...");
        while (true) {
            if (csvFile.lastModified() != lastUpdated) {
                BufferedReader csvReader = null;
                List<String> values = new ArrayList<String>(20);
                try {
                    csvReader = new BufferedReader(new FileReader("..."));
                    for (int index = 0; index < 20; index++) {
                        values.add(CSVFile.readLine());
                    }
                    publish(values);
                    lastUpdated = csvFile.lastModified();
                } finally {
                    try {
                        csvReader.close();
                    } catch (Exception e) {
                    }
                }

                Thread.sleep(20000);

            }
        }
    }
}

initialiseこれは、メソッドの最後に。を使用して配置しnew FileCheckerWorker.execute()ます。

更新しました

フィールドを作成する代わりにstatic、の参照をMapTestワーカーに渡します。

import java.awt.Color;
import java.awt.EventQueue;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.SwingWorker;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;

public class MapTest {

    private JFrame frame;
    protected JTextField txtCardiff;
    protected JTextField txtBristol;
    protected JTextField txtSheffield;
    protected JTextField txtDerby;
    protected JTextField txtGlasgow;
    protected JTextField txtFalkirk;
    protected JTextField txtNewcastle;
    protected JTextField txtLeeds;
    protected JTextField txtPreston;
    protected JTextField txtManchester;
    protected JTextField txtWolverhampton;
    protected JTextField txtBirmingham;
    protected JTextField txtMiltonKeynes;
    protected JTextField txtPeterborough;
    protected JTextField txtColindale;
    protected JTextField txtStepneyGreen;
    protected JTextField txtSlough;
    protected JTextField txtFaraday;
    protected JTextField txtGuildford;
    protected JTextField txtSouthbank;
    private BufferedReader CSVFile = new BufferedReader(new FileReader("C:/Users/606854007/workspace/NetworkAppTest/jar/window/Cardiff.txt"));

    ArrayList<String> csv = new ArrayList<String>();

    public static void main(String[] args) {
        try {
            UIManager.setLookAndFeel(
                            UIManager.getSystemLookAndFeelClassName());
        } catch (Exception e1) {
            e1.printStackTrace();
        }
        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    MapTest window = new MapTest();
                    window.frame.setVisible(true);
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the application.
     *
     * @throws IOException
     */
    public MapTest() throws IOException {
        try {
            initialize();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }

    /**
     * Initialise the contents of the frame.
     *
     * @param output
     * @throws IOException
     */
    private void initialize() throws IOException {
        frame = new JFrame();
        frame.setBounds(0, 0, 1000, 1086);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.getContentPane().setLayout(null);
        frame.setBackground(Color.CYAN);

        txtCardiff = new JTextField();
        txtCardiff.setBackground(Color.GREEN);
        txtCardiff.setBounds(305, 699, 102, 20);
        frame.getContentPane().add(txtCardiff);
        txtCardiff.setColumns(10);

        txtBristol = new JTextField();
        txtBristol.setBackground(Color.GREEN);
        txtBristol.setBounds(416, 780, 102, 20);
        frame.getContentPane().add(txtBristol);
        txtBristol.setColumns(10);

        txtSheffield = new JTextField();
        txtSheffield.setBackground(Color.GREEN);
        txtSheffield.setBounds(517, 356, 110, 20);
        frame.getContentPane().add(txtSheffield);
        txtSheffield.setColumns(10);

        txtDerby = new JTextField();
        txtDerby.setBackground(Color.GREEN);
        txtDerby.setBounds(582, 451, 90, 20);
        frame.getContentPane().add(txtDerby);
        txtDerby.setColumns(10);

        txtGlasgow = new JTextField();
        txtGlasgow.setBackground(Color.GREEN);
        txtGlasgow.setBounds(250, 94, 102, 20);
        frame.getContentPane().add(txtGlasgow);
        txtGlasgow.setColumns(10);

        txtFalkirk = new JTextField();
        txtFalkirk.setColumns(10);
        txtFalkirk.setBackground(Color.GREEN);
        txtFalkirk.setBounds(331, 41, 102, 20);
        frame.getContentPane().add(txtFalkirk);

        txtNewcastle = new JTextField();
        txtNewcastle.setColumns(10);
        txtNewcastle.setBackground(Color.GREEN);
        txtNewcastle.setBounds(424, 141, 111, 20);
        frame.getContentPane().add(txtNewcastle);

        txtLeeds = new JTextField();
        txtLeeds.setColumns(10);
        txtLeeds.setBackground(Color.GREEN);
        txtLeeds.setBounds(481, 244, 102, 20);
        frame.getContentPane().add(txtLeeds);

        txtPreston = new JTextField();
        txtPreston.setColumns(10);
        txtPreston.setBackground(Color.GREEN);
        txtPreston.setBounds(356, 221, 102, 20);
        frame.getContentPane().add(txtPreston);

        txtManchester = new JTextField();
        txtManchester.setColumns(10);
        txtManchester.setBackground(Color.GREEN);
        txtManchester.setBounds(394, 394, 124, 20);
        frame.getContentPane().add(txtManchester);

        txtWolverhampton = new JTextField();
        txtWolverhampton.setColumns(10);
        txtWolverhampton.setBackground(Color.GREEN);
        txtWolverhampton.setBounds(360, 486, 153, 20);
        frame.getContentPane().add(txtWolverhampton);

        txtBirmingham = new JTextField();
        txtBirmingham.setColumns(10);
        txtBirmingham.setBackground(Color.GREEN);
        txtBirmingham.setBounds(424, 553, 128, 20);
        frame.getContentPane().add(txtBirmingham);

        txtMiltonKeynes = new JTextField();
        txtMiltonKeynes.setColumns(10);
        txtMiltonKeynes.setBackground(Color.GREEN);
        txtMiltonKeynes.setBounds(474, 604, 135, 20);
        frame.getContentPane().add(txtMiltonKeynes);

        txtPeterborough = new JTextField();
        txtPeterborough.setColumns(10);
        txtPeterborough.setBackground(Color.GREEN);
        txtPeterborough.setBounds(655, 576, 135, 20);
        frame.getContentPane().add(txtPeterborough);

        txtColindale = new JTextField();
        txtColindale.setColumns(10);
        txtColindale.setBackground(Color.GREEN);
        txtColindale.setBounds(541, 699, 107, 20);
        frame.getContentPane().add(txtColindale);

        txtStepneyGreen = new JTextField();
        txtStepneyGreen.setColumns(10);
        txtStepneyGreen.setBackground(Color.GREEN);
        txtStepneyGreen.setBounds(667, 699, 137, 20);
        frame.getContentPane().add(txtStepneyGreen);

        txtSlough = new JTextField();
        txtSlough.setColumns(10);
        txtSlough.setBackground(Color.GREEN);
        txtSlough.setBounds(525, 756, 102, 20);
        frame.getContentPane().add(txtSlough);

        txtFaraday = new JTextField();
        txtFaraday.setColumns(10);
        txtFaraday.setBackground(Color.GREEN);
        txtFaraday.setBounds(650, 756, 102, 20);
        frame.getContentPane().add(txtFaraday);

        txtGuildford = new JTextField();
        txtGuildford.setColumns(10);
        txtGuildford.setBackground(Color.GREEN);
        txtGuildford.setBounds(525, 822, 102, 20);
        frame.getContentPane().add(txtGuildford);

        txtSouthbank = new JTextField();
        txtSouthbank.setColumns(10);
        txtSouthbank.setBackground(Color.GREEN);
        txtSouthbank.setBounds(655, 807, 115, 20);
        frame.getContentPane().add(txtSouthbank);

        JLabel lblNewLabel = new JLabel("New label");
        lblNewLabel.setForeground(Color.BLACK);
        lblNewLabel.setBackground(Color.BLACK);
        lblNewLabel.setIcon(new ImageIcon(
                        "C:\\Users\\606854007\\workspace\\NetworkAppTest\\Test\\window\\England_Wales.gif"));
        lblNewLabel.setBounds(33, 11, 890, 1086);
        frame.getContentPane().add(lblNewLabel);

        new FileCheckerWorker(this).execute();

    }

    public class FileCheckerWorker extends SwingWorker<Object, List<String>> {

        private MapTest mapTest;

        public FileCheckerWorker(MapTest mapTest) {
            this.mapTest = mapTest;
        }

        @Override
        protected void process(List<List<String>> chunks) {
            List<String> values = chunks.get(chunks.size() - 1);

            mapTest.txtCardiff.setText(values.get(0));
            mapTest.txtBristol.setText(values.get(1));
            mapTest.txtSheffield.setText(values.get(2));
            mapTest.txtDerby.setText(values.get(3));
            mapTest.txtGlasgow.setText(values.get(4));
            mapTest.txtFalkirk.setText(values.get(5));
            mapTest.txtNewcastle.setText(values.get(6));
            mapTest.txtLeeds.setText(values.get(7));
            mapTest.txtPreston.setText(values.get(8));
            mapTest.txtManchester.setText(values.get(9));
            mapTest.txtWolverhampton.setText(values.get(10));
            mapTest.txtBirmingham.setText(values.get(11));
            mapTest.txtMiltonKeynes.setText(values.get(12));
            mapTest.txtPeterborough.setText(values.get(13));
            mapTest.txtColindale.setText(values.get(14));
            mapTest.txtStepneyGreen.setText(values.get(15));
            mapTest.txtSlough.setText(values.get(16));
            mapTest.txtFaraday.setText(values.get(17));
            mapTest.txtGuildford.setText(values.get(18));
            mapTest.txtSouthbank.setText(values.get(19));
        }

        @Override
        protected Object doInBackground() throws Exception {
            long lastUpdated = -1;
            File csvFile = new File("C:/Users/606854007/workspace/NetworkAppTest/Jar/window/Cardiff.txt");
            while (true) {
                if (csvFile.lastModified() != lastUpdated) {
                    BufferedReader csvReader = null;
                    List<String> values = new ArrayList<String>(20);
                    try {
                        csvReader = new BufferedReader(new FileReader("C:/Users/606854007/workspace/NetworkAppTest/Jar/window/Cardiff.txt"));
                        for (int index = 0; index < 20; index++) {
                            values.add(mapTest.CSVFile.readLine());
                        }
                        publish(values);
                        lastUpdated = csvFile.lastModified();
                    } finally {
                        try {
                            csvReader.close();
                        } catch (Exception e) {
                        }
                    }

                    Thread.sleep(5000);
                    System.out.println("Check For Change");
                }
            }
        }
    }
}
于 2013-03-04T09:44:11.327 に答える
1

ScheduledExecutorServiceを見てください。これを使用して、いくつかの定期的なタスクをスケジュールできます。（あなたの場合、20秒ごとにファイルから読み取ります）。

于 2013-03-04T09:43:37.927 に答える