当通过ProcessBuilder运行命令行命令(特别是" GetMac / s")如果它抛出错误或正常返回并且我可以读取它返回的错误或MAC地址但是如果它提示用户输入(使用getmac时,网络上的某些电脑需要密码),该过程将暂停等待密码。
以下是从命令行运行时该命令的作用:
以下是我用于该流程的代码:
package testing;
import java.io.IOException;
class test1 {
public static void main(String[] args){
String hostName = "testpc";
ProcessBuilder builder = new ProcessBuilder("getmac", "/s", hostName, "/nh");
builder.inheritIO();
try {
Process proc = builder.start();
} catch (IOException e) {
e.printStackTrace();
}
}
}
我需要mac的原因是为了唤醒局域网程序,并希望在他们被检测到时自动获取任何新的PC的mac地址,这样用户就不必输入它手动。所以如果你知道一个更好的方法来获取远程电脑的MAC,请告诉我,我会改用它。
我意识到java可能不是最好用的语言,但它是我目前唯一知道的,这对于我的工作停机来说只是一个有趣的小项目。
**编辑:如果它需要密码我只想忽略该PC并终止进程并转到下一台PC
答案 0 :(得分:3)
您需要处理与Process关联的所有Streams,包括InputStream,ErrorStream和OutputStream。您在命令行中看到的文本将通过InputStream传入,然后您将要传递通过OutputStream请求的信息。
您需要在自己的Threads中读取InputStream和ErrorStream。我经常将它们包装在Scanner对象中,如果它们正在传递文本,我经常将OutputStream包装在BufferedOutputStream中,并将其包装在PrintStream对象中。
如,
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.util.Scanner;
class Test1 {
private static PrintStream out;
public static void main(String[] args) {
String hostName = "testpc";
String[] commands = {"getmac", "/s", hostName,
"/nh"};
ProcessBuilder builder = new ProcessBuilder(commands);
// builder.inheritIO(); // I avoid this. It was messing me up.
try {
Process proc = builder.start();
InputStream errStream = proc.getErrorStream();
InputStream inStream = proc.getInputStream();
OutputStream outStream = proc.getOutputStream();
new Thread(new StreamGobbler("in", out, inStream)).start();
new Thread(new StreamGobbler("err", out, errStream)).start();
out = new PrintStream(new BufferedOutputStream(outStream));
int errorCode = proc.waitFor();
System.out.println("error code: " + errorCode);
} catch (IOException e) {
e.printStackTrace();
} catch (InterruptedException e) {
e.printStackTrace();
} finally {
if (out != null) {
out.close();
}
}
}
}
class StreamGobbler implements Runnable {
private PrintStream out;
private Scanner inScanner;
private String name;
public StreamGobbler(String name, PrintStream out, InputStream inStream) {
this.name = name;
this.out = out;
inScanner = new Scanner(new BufferedInputStream(inStream));
}
@Override
public void run() {
while (inScanner.hasNextLine()) {
String line = inScanner.nextLine();
// do something with the line!
// check if requesting password
System.out.printf("%s: %s%n", name, line);
}
}
}