Java Runtime.getRuntime（）：从执行命令行程序获取输出

Z时代
2024-01-10
分类：问答

我正在使用运行时从Java程序运行命令提示符命令。但是，我不知道如何获得命令返回的输出。

这是我的代码：

Runtime rt = Runtime.getRuntime();
String[] commands = {"system.exe", "-send" , argument};
Process proc = rt.exec(commands);

我尝试做，System.out.println(proc);但是没有返回任何东西。该命令的执行应返回两个数字，以分号分隔。我怎样才能在变量中打印出来？

这是我现在使用的代码：

String[] commands = {"system.exe", "-get t"};
Process proc = rt.exec(commands);
InputStream stdIn = proc.getInputStream();
InputStreamReader isr = new InputStreamReader(stdIn);
BufferedReader br = new BufferedReader(isr);
String line = null;
System.out.println("<OUTPUT>");
while ((line = br.readLine()) != null)
     System.out.println(line);
System.out.println("</OUTPUT>");
int exitVal = proc.waitFor();
System.out.println("Process exitValue: " + exitVal);

但是我没有得到任何输出，但是当我自己运行该命令时，它可以正常工作。

回答：

这是要走的路：

Runtime rt = Runtime.getRuntime();
String[] commands = {"system.exe", "-get t"};
Process proc = rt.exec(commands);
BufferedReader stdInput = new BufferedReader(new 
     InputStreamReader(proc.getInputStream()));
BufferedReader stdError = new BufferedReader(new 
     InputStreamReader(proc.getErrorStream()));
// Read the output from the command
System.out.println("Here is the standard output of the command:\n");
String s = null;
while ((s = stdInput.readLine()) != null) {
    System.out.println(s);
}
// Read any errors from the attempted command
System.out.println("Here is the standard error of the command (if any):\n");
while ((s = stdError.readLine()) != null) {
    System.out.println(s);
}