我想在JAVA程序中执行EXE文件。
它工作正常,但我想在我的JAVA程序的textArea中立即输出EXE。
目前我在" ping" -Command完全结束后得到输出(因此JAVA程序挂起约3秒)。但我想立即得到结果......
我做错了什么?
ProcessBuilder pb = new ProcessBuilder().command("C:\\Windows\\SysWOW64\\PING.EXE", "127.0.0.1");
pb.redirectErrorStream(true);
Process process = pb.start();
InputStream processStdOutput = process.getInputStream();
Reader r = new InputStreamReader(processStdOutput);
BufferedReader br = new BufferedReader(r);
String line;
while ((line = br.readLine()) != null) {
// System.out.println(line); // the output is here
textArea.append(line);
}
突击队倒退。
我想使用这个程序: https://iperf.fr/iperf-download.php
输出如下:
Connecting to host 10.1.100.34, port 5201
[ 4] local 172.16.12.33 port 63802 connected to 10.1.100.34 port 5201
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-1.00 sec 112 MBytes 944 Mbits/sec
[ 4] 1.00-2.00 sec 112 MBytes 944 Mbits/sec
[ 4] 2.00-3.00 sec 112 MBytes 944 Mbits/sec
[ 4] 3.00-4.00 sec 112 MBytes 940 Mbits/sec
[ 4] 4.00-5.00 sec 112 MBytes 944 Mbits/sec
[ 4] 5.00-6.00 sec 112 MBytes 944 Mbits/sec
[ 4] 6.00-7.00 sec 112 MBytes 940 Mbits/sec
[ 4] 7.00-8.00 sec 112 MBytes 944 Mbits/sec
[ 4] 8.00-9.00 sec 112 MBytes 940 Mbits/sec
[ 4] 9.00-10.00 sec 112 MBytes 944 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth
[ 4] 0.00-10.00 sec 1.10 GBytes 942 Mbits/sec sender
[ 4] 0.00-10.00 sec 1.10 GBytes 942 Mbits/sec receiver
iperf Done.
iperf运行后,我仍然只能得到这个完整的输出。如果我调试,我得到线(逐行)。所以可能还有另一个问题......
答案 0 :(得分:2)
为了成为现实,我尝试了你的例子,它立即输出流,但我没有使用文本区域,但控制台输出。 您的代码究竟是如何调用的?也许它与GUI重绘管理器有关 - 它是从EDT调用的吗?如果不是,这可能会导致延迟。
尝试做这样的事情:
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
area.append(line);
}
});
当您使用后台任务时(但您不知道),您应该使用专用实用程序来实现此SwingWorker
https://docs.oracle.com/javase/7/docs/api/javax/swing/SwingWorker.html。作为奖励,这里是完整的例子,你可以自己跑。它使用swing worker来完成后台工作并在EDT上更新GUI
public class LetsPing {
public static void main(String[] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLayout(new BorderLayout());
frame.setSize(300, 300);
frame.setLocationRelativeTo(null);
JTextArea textArea = new JTextArea();
frame.add(textArea, BorderLayout.CENTER);
frame.setVisible(true);
new SwingWorker<Void, String>() {
@Override
protected Void doInBackground() throws Exception {
ProcessBuilder pb = new ProcessBuilder().command("C:\\Windows\\SysWOW64\\PING.EXE", "127.0.0.1");
pb.redirectErrorStream(true);
Process process;
process = pb.start();
InputStream processStdOutput = process.getInputStream();
Reader r = new InputStreamReader(processStdOutput);
BufferedReader br = new BufferedReader(r);
String line;
while ((line = br.readLine()) != null) {
publish(line);
}
return null;
}
@Override
protected void process(List<String> chunks) {
for (String line : chunks) {
textArea.append(line);
textArea.append("\n");
}
}
}.execute();
}
}