use*_*046 4 java swing jlabel println system.out
我想将sytem.out.println重定向到另一个类中的JLabel.
我有2个类,NextPage和Mctrainer.
NextPage基本上只是一个Jframe(我的项目的gui),我使用这个代码在Nextpage中创建了一个Jlabel;
public class NextPage extends JFrame {
JLabel label1;
NextPage() {
label1 = new JLabel();
label1.setText("welcome");
getContentPane().add(label1);
这是Mctrainer的代码:
public class Mctrainer {
JLabel label1;
Mctrainer() {
HttpClient client2 = new DefaultHttpClient();
HttpPost post = new HttpPost("http://oo.hive.no/vlnch");
HttpProtocolParams.setUserAgent(client2.getParams(),"android");
try {
List <NameValuePair> nvp = new ArrayList <NameValuePair>();
nvp.add(new BasicNameValuePair("username", "test"));
nvp.add(new BasicNameValuePair("password", "test"));
nvp.add(new BasicNameValuePair("request", "login"));
nvp.add(new BasicNameValuePair("request", "mctrainer"));
post.setEntity(new UrlEncodedFormEntity(nvp));
HttpContext httpContext = new BasicHttpContext();
HttpResponse response1 = client2.execute(post, httpContext);
BufferedReader rd = new BufferedReader(new InputStreamReader(response1.getEntity().getContent()));
String line = "";
while ((line = rd.readLine()) != null) {
System.out.println(line);
}
}
catch (IOException e) {
e.printStackTrace();
}
}
Mctrainer基本上只是使用system.out.println从服务器打印出JSON数据.我想重定向它以显示在我的GUI(NextPage)中的JLabel而不是控制台.有关如何做到这一点的任何建议？
您只需要更改默认输出...
public static void main(String[] args) throws UnsupportedEncodingException
{
ByteArrayOutputStream bos = new ByteArrayOutputStream();
System.setOut(new PrintStream(bos));
System.out.println("outputing an example");
JOptionPane.showMessageDialog(null, "Captured: " + bos.toString("UTF-8"));
}
此外,你的问题是非常相似这另外一个,这样我就可以适应这种接受的答案一起工作JLabel
public static void main(String[] args) throws UnsupportedEncodingException
{
CapturePane capturePane = new CapturePane();
System.setOut(new PrintStream(new StreamCapturer("STDOUT", capturePane, System.out)));
System.out.println("Output test");
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.add(capturePane);
frame.setSize(200, 200);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
System.out.println("More output test");
}
public static class CapturePane extends JPanel implements Consumer {
private JLabel output;
public CapturePane() {
setLayout(new BorderLayout());
output = new JLabel("<html>");
add(new JScrollPane(output));
}
@Override
public void appendText(final String text) {
if (EventQueue.isDispatchThread()) {
output.setText(output.getText() + text + "<br>");
} else {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
appendText(text);
}
});
}
}
}
public interface Consumer {
public void appendText(String text);
}
public static class StreamCapturer extends OutputStream {
private StringBuilder buffer;
private String prefix;
private Consumer consumer;
private PrintStream old;
public StreamCapturer(String prefix, Consumer consumer, PrintStream old) {
this.prefix = prefix;
buffer = new StringBuilder(128);
buffer.append("[").append(prefix).append("] ");
this.old = old;
this.consumer = consumer;
}
@Override
public void write(int b) throws IOException {
char c = (char) b;
String value = Character.toString(c);
buffer.append(value);
if (value.equals("\n")) {
consumer.appendText(buffer.toString());
buffer.delete(0, buffer.length());
buffer.append("[").append(prefix).append("] ");
}
old.print(c);
}
}