SwingWorker et client serveur

Bounjour,

je cherche à afficher un flux de données en streaming venus d'une application externe qui joue le role (client)d'un listener qui écoute un serveur et affiche ce qu'il a reçu dans jtextarea

j'ai essaie d'utliser swingworker pour afficher le flux car mon application qui reçoit reste en cours d'éxécution le long de la reception mais j'ai des erreurs que j'ai pas pu résoudre de plus.. étant débutante j'arrive pas à bien gérer ça .
Pouvez vous m'aider SVP:?

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;
import javax.swing.JTextArea;
import javax.swing.SwingWorker;
 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
/**
 *
 * @author Samya
 */
public class Welcome extends javax.swing.JFrame {
 
    /**
     * Creates new form Welcome
     */
 
 
    public Welcome() {
        initComponents();
 
    }
 
 
 class ListenWork extends SwingWorker< String , String> {
 
    public ListenWork() throws IOException{
        String array[]= new String[5];
        array[0] = User.getText();
        array[1]= Pass.getText();
        array[2]= Port.getText();
        array[3] = Ip.getText();
       //array[5]= File.getText();
        String[] commande = {"receiver.exe",array[2],array[3],array[0],array[1]};
            ProcessBuilder p = new ProcessBuilder(commande);
            final Process pb = p.start();
 
    }
 
 
    protected void doInBackground(Process pb) throws IOException{
        while(true){
	    BufferedReader reader = new BufferedReader(new InputStreamReader(pb.getInputStream()));
		String messageFromDatagram ="";
                messageFromDatagram = reader.readLine();
 
            publish(messageFromDatagram);
        }
    }
 
        @Override
    protected void process(List<String> messages){
        for(String message : messages){
            jTextArea1.append(message);
        }
    }
    }
 
 
    private void jRadioButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                              
 
    }                                             
 
    private void jToggleButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                               
        // TODO add your handling code here:
    }                                              
 
 
    /**
     * @param args the command line arguments
     */
    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(Welcome.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Welcome.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Welcome.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Welcome.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
 
        /*
         * Create and display the form
         */
                Welcome demo = new Welcome();
                ListenWork swingWorker = demo.new ListenWork;
                swingWorker.execute();
 
        java.awt.EventQueue.invokeLater(new Runnable() {
 
            public void run() {
                new Welcome().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JTextField Ip;
    private javax.swing.JTextField Pass;
    private javax.swing.JTextField Port;
    private javax.swing.JTextField User;
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.ButtonGroup buttonGroup2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JRadioButton jRadioButton1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JTextArea jTextArea1;
    private javax.swing.JTextArea jTextArea2;
    private javax.swing.JToggleButton jToggleButton1;
    private javax.swing.JToggleButton jToggleButton2;
    // End of variables declaration                   
}

ce Sont les erreurs rencontrés

Code:

1
2
3
 
C:\Users\Samya\Documents\NetBeansProjects\final_bienvenue\src\final_bienvenue\Welcome.java:286: error: Welcome.ListenWork is abstract; cannot be instantiated
                ListenWork swingWorker = demo.new ListenWork();

La ligne ListenWork swingWorker = demo.new ListenWork(); qui est donnée en message d'erreur, n'apparaît pas dans le code source que tu nous as montré.

Il semble que le code que tu essaies de compiler ne soit pas vraiment celui que tu nous montres. Dans ce cas, on ne peut pas t'aider.

Code:

ListenWork swingWorker = new ListenWork(); // au lieu de demo.new ListenWork;

Et je crois que la méthode

Code:

void doInBackground(Process pb) throws IOException{

N'as pas la bonne signature liée à

Code:

SwingWorker< String , String>

Ce devrait être

Code:

String doInBackground() throws Exception{

Référence => http://docs.oracle.com/javase/7/docs...ckground%28%29

modifications faites sauf la deuxième car comme la première modifications ainsi que d'autre m'ont permet d'éviter les erreurs mais à l'exécution !!

Code:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
 
package final_bienvenue;
 
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.List;
import javax.swing.JTextArea;
import javax.swing.SwingWorker;
 
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
/**
 *
 * @author Samya
 */
public class Welcome extends javax.swing.JFrame {
 
    /**
     * Creates new form Welcome
     */
 
 
    public Welcome() {
        initComponents();
 
    }
 
 
 
    /**
     * This method is called from within the constructor to initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is always
     * regenerated by the Form Editor.
     */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {
 
        buttonGroup1 = new javax.swing.ButtonGroup();
        buttonGroup2 = new javax.swing.ButtonGroup();
        Port = new javax.swing.JTextField();
        Ip = new javax.swing.JTextField();
        User = new javax.swing.JTextField();
        Pass = new javax.swing.JTextField();
        jRadioButton1 = new javax.swing.JRadioButton();
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();
        jToggleButton1 = new javax.swing.JToggleButton();
        jScrollPane2 = new javax.swing.JScrollPane();
        jTextArea2 = new javax.swing.JTextArea();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jLabel5 = new javax.swing.JLabel();
        jLabel6 = new javax.swing.JLabel();
        jToggleButton2 = new javax.swing.JToggleButton();
 
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
 
        jRadioButton1.setText("démarrage receiver");
        jRadioButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jRadioButton1ActionPerformed(evt);
            }
        });
 
        jTextArea1.setColumns(20);
        jTextArea1.setRows(5);
        jScrollPane1.setViewportView(jTextArea1);
 
        jToggleButton1.setText("Se connecter");
        jToggleButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jToggleButton1ActionPerformed(evt);
            }
        });
 
        jTextArea2.setColumns(20);
        jTextArea2.setRows(5);
        jScrollPane2.setViewportView(jTextArea2);
 
        jLabel1.setText("Erreurs :");
 
        jLabel2.setText("Le flux récupéré :");
 
        jLabel3.setText("Port");
 
        jLabel4.setText("Host");
 
        jLabel5.setText("User");
 
        jLabel6.setText("Password");
 
        jToggleButton2.setText("Se déconnecter du serveur ");
 
        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(73, 73, 73)
                        .addComponent(jRadioButton1))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(22, 22, 22)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                                .addComponent(jLabel4)
                                .addComponent(jLabel3)
                                .addComponent(jLabel5))
                            .addComponent(jLabel6))
                        .addGap(38, 38, 38)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(Ip, javax.swing.GroupLayout.PREFERRED_SIZE, 121, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(Port, javax.swing.GroupLayout.PREFERRED_SIZE, 121, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(User, javax.swing.GroupLayout.PREFERRED_SIZE, 121, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(Pass, javax.swing.GroupLayout.PREFERRED_SIZE, 121, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 92, Short.MAX_VALUE)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addGroup(layout.createSequentialGroup()
                        .addComponent(jLabel2)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                        .addComponent(jToggleButton1)
                        .addGap(242, 242, 242))
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 541, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 541, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addGroup(layout.createSequentialGroup()
                                .addGap(10, 10, 10)
                                .addComponent(jLabel1)))
                        .addGap(18, 18, 18))))
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jToggleButton2)
                .addGap(271, 271, 271))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                        .addGap(32, 32, 32)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(Port, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel3))
                        .addGap(28, 28, 28)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(Ip, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel4))
                        .addGap(32, 32, 32)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(User, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel5))
                        .addGap(30, 30, 30))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(26, 26, 26)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addGroup(layout.createSequentialGroup()
                                .addComponent(jToggleButton1)
                                .addGap(18, 18, 18))
                            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                                .addComponent(jLabel2)
                                .addGap(7, 7, 7)))
                        .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 201, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(9, 9, 9)
                        .addComponent(jLabel1)
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createSequentialGroup()
                        .addGap(3, 3, 3)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addComponent(Pass, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(jLabel6))
                        .addGap(18, 18, 18)
                        .addComponent(jRadioButton1)))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 42, Short.MAX_VALUE)
                .addComponent(jToggleButton2)
                .addGap(31, 31, 31))
        );
 
        pack();
    }// </editor-fold>                        
 class ListenWork extends SwingWorker< String , String> {
        String array[]= new String[5];
    public ListenWork() throws IOException{
 
        array[0] = User.getText();
        array[1]= Pass.getText();
        array[2]= Port.getText();
        array[3] = Ip.getText();
       //array[5]= File.getText();
 
    }
     String[] commande = {"receiver.exe",array[2],array[3],array[0],array[1]};
            ProcessBuilder p = new ProcessBuilder(commande);
            final Process pb = p.start();
 
       @Override
        protected String doInBackground() throws Exception {
            while(true){
	    BufferedReader reader = new BufferedReader(new InputStreamReader(pb.getInputStream()));
		String messageFromDatagram ="";
                messageFromDatagram = reader.readLine();
 
            publish(messageFromDatagram);
        }
        }
 
 
 
 
        @Override
    protected void process(List<String> messages){
        for(String message : messages){
            jTextArea1.append(message);
        }
    }
 
 
    }
 
 
    private void jRadioButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                              
 
    }                                             
 
    private void jToggleButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                               
        // TODO add your handling code here:
    }                                              
 
 
 
 
 
/* Thread prcss = new Thread(){
    public void run(Process pb){
        try {
            pb= p.start();
             
                try {
                    pb.waitFor();
                } catch (InterruptedException ex) {
                    Logger.getLogger(Welcome.class.getName()).log(Level.SEVERE, null, ex);
                }
           } catch (Exception e) {
            e.printStackTrace();
        }}};*/
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) throws IOException {
        /*
         * 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(Welcome.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Welcome.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Welcome.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Welcome.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>
 
        /*
         * Create and display the form
         */
                Welcome demo = new Welcome();
                ListenWork swingWorker = demo.new ListenWork();
                swingWorker.execute();
 
        java.awt.EventQueue.invokeLater(new Runnable() {
 
            public void run() {
                new Welcome().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify                     
    private javax.swing.JTextField Ip;
    private javax.swing.JTextField Pass;
    private javax.swing.JTextField Port;
    private javax.swing.JTextField User;
    private javax.swing.ButtonGroup buttonGroup1;
    private javax.swing.ButtonGroup buttonGroup2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JLabel jLabel3;
    private javax.swing.JLabel jLabel4;
    private javax.swing.JLabel jLabel5;
    private javax.swing.JLabel jLabel6;
    private javax.swing.JRadioButton jRadioButton1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JScrollPane jScrollPane2;
    private javax.swing.JTextArea jTextArea1;
    private javax.swing.JTextArea jTextArea2;
    private javax.swing.JToggleButton jToggleButton1;
    private javax.swing.JToggleButton jToggleButton2;
    // End of variables declaration                   
}

output:

Code:

1
2
3
4
Exception in thread "main" java.lang.NullPointerException
	at java.lang.ProcessBuilder.start(ProcessBuilder.java:1010)
	at final_bienvenue.Welcome$ListenWork.<init>(Welcome.java:204)
	at final_bienvenue.Welcome.main(Welcome.java:291)

On ne voit pas la ligne ou le ListenWork est créé. Mais d'apres l'erreur, on peut imaginer que les textfields ne sont pas créés lorsque le swingworker est lancé...