Java JTextArea setText 不起作用
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JTextArea setText is not working
提问by Damian Lesniak
I have a problem with setting text in JTextArea, I tried setText(which I'd prefer) and append also. I do not know where the problem is, I got client-server app. I want to put message that server sends in JTextField but I am unable to here is my code:
我在 JTextArea 中设置文本时遇到问题，我尝试了 setText（我更喜欢）并附加。我不知道问题出在哪里，我得到了客户端 - 服务器应用程序。我想把服务器发送的消息放在 JTextField 中，但我无法在这里是我的代码：
client side code which is reciving the message properly:
正确接收消息的客户端代码：
try
{
Socket socket = new Socket("localhost", PORT);
BufferedReader input = new BufferedReader( new InputStreamReader(System.in));
DataOutputStream output = new DataOutputStream(socket.getOutputStream());
BufferedReader serverInput = new BufferedReader(new InputStreamReader(socket.getInputStream()));
output.writeBytes(outputString + "\n");
inputString = serverInput.readLine(); // private String inputString
mymodel.setTextArea(inputString); // this is not working
System.out.println(inputString); // this is working
socket.close();
}
catch...
setTextArea method:
setTextArea 方法：
public void setTextArea(String string)
{
MyPanel mypanel = new MyPanel();
mypanel.textArea.setText(string); // debugger shows that the string contains message from server
}
I have set textarea to public since setter method weren't working, actually this one isn't working also. I do not know where the problem is, and debugger isn't helping me either.
由于 setter 方法不起作用，我已将 textarea 设置为 public，实际上这个方法也不起作用。我不知道问题出在哪里，调试器也没有帮助我。
Looking for your answers
寻找你的答案
EDIT:
编辑：
JTextTable code:
JTextTable 代码：
textArea = new JTextArea(1, 30);
textArea.setEditable(false);
panel.add(textArea, c);
采纳答案by mlethys
Try to get access through getter. Like
尝试通过 getter 获取访问权限。喜欢
public JTextArea getTextArea()
{
return jTextAreaField;
}
and then
进而
getTextArea().append("ur text");
回答by MadProgrammer
You're creating a new instance of MyPaneleach time the setTextAreamethod is called, this means that what ever is on the screen isn't been used to apply the text you are sending it.
MyPanel每次setTextArea调用该方法时，您都会创建一个新实例，这意味着屏幕上的任何内容都不会用于应用您发送的文本。
Instead, you should use the original instance of MyPanelthat you created to show on the screen...
相反，您应该使用MyPanel您创建的原始实例显示在屏幕上......
It's also impossible to determine if you are calling the blocking I/O from the content of the Event Dispatching Thread or interacting with the UI from a different thread. In either case, it's highly unrecommended
也无法确定您是从 Event Dispatching Thread 的内容调用阻塞 I/O，还是从不同线程与 UI 交互。在任何一种情况下，它都是非常不推荐的
Take a look at Concurrency in Swingfor more details
回答by MByD
There are two main problems:
主要有两个问题：
You perform the UI modification on the same thread as the IO, which you should never do. Consider working with
SwingWorkerfor I/O operations.In
setTextAreayou are not accessing the instance ofMyPanelthat you already have, but creating a new one. So the changes are not done in theMyPanelinstance that you already have...
您在与 IO 相同的线程上执行 UI 修改，这是您永远不应该做的。考虑使用
SwingWorkerfor I/O 操作。在
setTextArea你没有访问的情况下MyPanel，你已经有了，但创建一个新的。所以更改不会在MyPanel您已经拥有的实例中完成...
回答by Benjamin
JTextArea t=new JTextArea();
t.append("Text");
no Method in java to set Text for JTextArea.
the append method to add text in JTextArea
