使用SwingWorker为界面执行异步任务

当UI界面需要读取网络内容等耗时操作时，可以使用这个方法。

添加按钮的点击事件：

btnRun.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseClicked(MouseEvent e) {
				webRead();
			}
		});

 添加webReader方法：

	public void webRead() {
		new SwingWorker<StringBuilder, String>(){

			@Override
			protected StringBuilder doInBackground() throws Exception {
				URL url=new URL("https://home.firefoxchina.cn/?from=extra_start");
				URLConnection connection=url.openConnection();
				BufferedReader reader=new BufferedReader(new InputStreamReader(connection.getInputStream(), "UTF-8"));
				String line;
				StringBuilder builder =new StringBuilder();
				while((line=reader.readLine())!=null) {
//					publish(line);
					builder.append(line).append("\n");
				}
				reader.close();
				return builder;
			}

			@Override
			protected void process(List<String> chunks) {
				for (String line:chunks) {
					textArea.append(line);
					textArea.append("\n");
				}
				super.process(chunks);
			}

			@Override
			protected void done() {
				try {
					textArea.setText(get().toString());
				} catch (InterruptedException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				} catch (ExecutionException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
				super.done();
			}
			
		}.execute();
	}