Question

我们试图通过Java调用Powershell脚本，但是当我们尝试读取该脚本的输出时它会挂起。它挂在“input.readLine（）”

上

以下是我们尝试的代码：

        String command = "cmd /c powershell C:\\_checkouts\\TestPowerShell\\passwordExpirationTime.ps1";
        Process p = Runtime.getRuntime().exec(command);
        new InputStreamReader(p.getInputStream());

        BufferedReader input = new BufferedReader(new InputStreamReader(p.getInputStream()));

        StringBuilder stringBuilder = new StringBuilder();;
        for (String line = input.readLine(); line != null; line = input.readLine()) {
            stringBuilder.append(line);
        }

        input.close();

        String msg = stringBuilder.toString();

        System.out.println("msg: " + msg);

我们尝试查看此解决方案Java program hangs when trying to invoke powershell script 但这些建议都不适合我们。

我们也尝试过没有cmd / c和cmd / k。我们真的希望这是一个可以调用任何脚本的泛型类。即BAT，BASH，SH，Powershell等

有什么想法吗？

感谢下面的答案，这里的代码是有效的：

    try{
        final ProcessBuilder pb = new ProcessBuilder("powershell","C:\\psFile.ps1");
        pb.redirectInput(Redirect.from(new File("NUL")));
        final Process p = pb.start();
        final int retcode = p.waitFor();

        InputStream is = p.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);
        String line;

        while ((line = br.readLine()) != null) {
            System.out.println(line);
        }
        br.close();
    }catch (Exception e){
        e.printStackTrace();
    }

以下是一些其他信息。我们的powershell因为受到限制而返回错误。这就是我们需要所有重定向到NUL的原因。一旦我们修复了它并且没有返回错误，我们就可以将代码简化为：

    try{
        final ProcessBuilder pb;

        pb = new ProcessBuilder(args);

        final Process p = pb.start();

        InputStream is = p.getInputStream();
        InputStreamReader isr = new InputStreamReader(is);
        BufferedReader br = new BufferedReader(isr);
        String line;

        while ((line = br.readLine()) != null) {
            System.out.println(line);
        }
        br.close();
    }catch (Exception e){
        e.printStackTrace();
    }

Answer 1

使用ProcessBuilder。任何暗示一点I / O的过程都应该直接拒绝通过Runtime.exec()运行，唉，它无法检测到这一点。而甲骨文没有将其标记为@Deprecated，这是一个遗憾。

反正：

final File logFile = new File("/path/to/logfile");
final ProcessBuilder pb = new ProcessBuilder("powershell", "/path/to/the/ps1");
pb.redirectOutput(Redirect.to(logFile));
pb.redirectErrorStream(true);

final Process p = pb.start();
final int retcode = p.waitFor();

// deal with retcode
// read result from the log file

java input.readLine在启动PowerShell脚本后挂起

1 个答案: