使用 Java 从 BAT 文件中获取输出
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Get output from BAT file using Java
提问by Muath
I'm trying to run a .bat file and get the output. I can run it but I can't get the results in Java:
我正在尝试运行 .bat 文件并获取输出。我可以运行它，但我无法在 Java 中获得结果：
String cmd = "cmd /c start C:\workspace\temp.bat";
Runtime r = Runtime.getRuntime();
Process pr = r.exec(cmd);
BufferedReader stdInput = new BufferedReader(
new InputStreamReader( pr.getInputStream() ));
String s ;
while ((s = stdInput.readLine()) != null) {
System.out.println(s);
}
The result is null. No idea why I get this. Note that I'm using Windows 7.
结果是null。不知道为什么我会得到这个。请注意，我使用的是 Windows 7。
采纳答案by Rapha?l
Using "cmd /c start [...]" to run a batch file will create a sub process instead of running your batch file directly.
使用“cmd /c start [...]”运行批处理文件将创建一个子进程，而不是直接运行批处理文件。
Thus, you won't have access to its output. To make it work, you should use:
因此，您将无法访问其输出。要使其工作，您应该使用：
String cmd = "C:\workspace\temp.bat";
It works under Windows XP.
它在 Windows XP 下工作。
回答by Juned Ahsan
You need to start a new thread that would read terminal output stream and copy it to the console, after you call process.waitFor().
您需要启动一个新线程，在您调用process.waitFor().
Do something like:
做类似的事情：
String line;
Process p = Runtime.getRuntime().exec(...);
BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));
while ((line = input.readLine()) != null) {
System.out.println(line);
}
input.close();
Better approach will be to use the ProcessBuilderclass, and try writing something like:
更好的方法是使用ProcessBuilder该类，并尝试编写如下内容：
ProcessBuilder builder = new ProcessBuilder("/bin/bash");
builder.redirectInput();
Process process = builder.start();
while ((line = reader.readLine ()) != null) {
System.out.println ("Stdout: " + line);
}
回答by shreyansh jogi
BufferedReader stdInput = new BufferedReader(new
InputStreamReader( pr.getErrorStream() ));
instead use
而是使用
BufferedReader stdInput = new BufferedReader(new
InputStreamReader( pr.getInputStream ));
