[英]Write to jTextArea from different class
Just wondering if it is possible to append to a jTextArea in one class from a separate class? 只是想知道是否可以将一个类中的jTextArea追加到一个单独的类中? I basically have a simple class that is constantly running calculations and I want to view the output on a GUI which I have created in its own class. 我基本上有一个不断运行计算的简单类,我想在自己的类中创建的GUI上查看输出。 The program executes fine via System.out.println but I want to view this on my textarea now. 该程序可以通过System.out.println执行良好,但我现在想在我的textarea上查看。 Many thanks in advance for any guidance. 在此先感谢您的指导。
Updated - The code below is what I am running. 已更新-以下代码是我正在运行的代码。 The area in question is the following (This is a method from a rather large class) : 有问题的区域如下(这是一个很大类的方法):
System.out.println("From Server:" + sentenceFromServer);
I want this output to be written to a seperate jTextArea which is in another class which is below the below class. 我希望将此输出写入单独的jTextArea,它位于下面的类之下的另一个类中。
Client Class 客户类别
public void run() {
SocketForm form = new SocketForm();
//File file=null;
long startTime; // Starting time of program, in milliseconds.
long endTime; // Time when computations are done, in milliseconds.
double time;
System.out.println("Variables Set");
String serverName = "localhost";
try {
//if (args.length >= 1)
// serverName = args[0];
InetAddress serverIPAddress = InetAddress.getByName(serverName);
//get server port;
int serverPort = form.cliportNo;
//if (args.length >= 2)
// serverPort = Integer.parseInt(args[1]);
//create socket
DatagramSocket clientSocket = new DatagramSocket();
//get input from keybaord
byte[] sendData = new byte[byteSize];
//BufferedReader inFromUser = new BufferedReader(new InputStreamReader (System.in));
//while (true){
//String sentence = inFromUser.readLine();
startTime = System.currentTimeMillis();
//sendData = sentence.getBytes();
System.out.println("About to identify image");
String fileName = "/Users/Andrew/Desktop/pic.jpg";
File f = new File(fileName);
FileInputStream fis = null;
try {
fis = new FileInputStream(f);
System.out.println("Total file size to read in bytes is : " + fis.available());
} catch (IOException e) {}
Path path = Paths.get("/Users/Andrew/Desktop/pic.jpg");
//byte[] data = Fles.readAllBytes(path);
sendData = Files.readAllBytes(path);
try {
for( int index = 0; index < sendData.length ; index += byteSize ) {
DatagramPacket packet = new DatagramPacket( sendData, index, Math.min( byteSize, sendData.length-index ), serverIPAddress, serverPort);
clientSocket.send(packet);
//DatagramPacket sendPacket = new DatagramPacket(sendData, sendData.length, serverIPAddress, serverPort);
//receive datagram
byte[] receiveData = new byte [byteSize];
DatagramPacket receivePacket = new DatagramPacket(receiveData, receiveData.length);
clientSocket.receive(receivePacket);
//print output
String sentenceFromServer = new String(receivePacket.getData());
System.out.println("From Server:" + sentenceFromServer);
}
System.out.println("The End");
}
catch (Exception e) {}
//close client socket
//clientSocket.close();
endTime = System.currentTimeMillis();
time = endTime - startTime;
System.out.println("Time :" + time);
// }
}
catch (Exception e) {}
}
SocketForm Class (GUI) SocketForm类(GUI)
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(SocketForm.class.getName()).log(java.util.logging.Level.SEV
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new SocketForm().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.ButtonGroup buttonGroup1;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JScrollPane jScrollPane2;
private javax.swing.JTabbedPane jTabbedPane1;
public static javax.swing.JTextArea jTextArea1;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
// End of variables declaration
} }
Suggestions: 意见建议:
public void appendText(String text)
that simply appends the text String to the JTextArea. 给GUI类一个公共方法, public void appendText(String text)
,该方法将文本String附加到JTextArea。 SwingWorker<Void, String>
and use the publish/process method pair to send the String from the server to the JTextArea, on the Swing E vent D ispatch T hread or EDT. 你应该考虑具体使用SwingWorker<Void, String>
并使用发布/处理方法对从服务器到JTextArea中发送字符串,在摆动Ë通气d ispatchŤhread或EDT。 catch (IOException e) {}
. 如上面代码所示, 永远不要有空的catch块catch (IOException e) {}
。 This is the coding equivalent of driving a motorcycle with your eyes closed. 这相当于闭着眼睛驾驶摩托车。 Yes, it might seem like fun at first, but it will almost always ends badly. 是的,乍一看似乎很有趣,但是几乎总会以糟糕的结果结束。 Edit 编辑
You state: 您声明:
"If it is as you say only suitable to run it on the EDT how can this be defined inside the thread which is already running?" “如果如您所说仅适合在EDT上运行它,那么如何在已经运行的线程中定义它呢?”
I know 2 ways: 我知道两种方式:
SwingUtilities.invokeLater(...)
method. 使用标准的后台线程,并将所有Swing调用放入传递给SwingUtilities.invokeLater(...)
方法的Runnable内。
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