在IntelliJ Idea中使用ProcessBuilder执行命令时出错

Question

使用的IDE：IntelliJ系统操作系统：Windows尝试过的命令：ProcessBuilder，Runtime.exec（）

我正在执行Main.java文件（如下所述）。它在终端中执行完美，但是在IntelliJ中，它引发以下错误。 ProcessBuilder和Runtime.exec（）也会发生相同的情况。

"C:\Program Files\Java\jdk1.8.0_241\bin\java.exe"
Exception in thread "main" java.io.IOException: Cannot run program "echo": CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
    at TestSample.Main.main(Main.java:24)
Caused by: java.io.IOException: CreateProcess error=2, The system cannot find the file specified
    at java.lang.ProcessImpl.create(Native Method)
    at java.lang.ProcessImpl.<init>(ProcessImpl.java:444)
    at java.lang.ProcessImpl.start(ProcessImpl.java:140)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
    ... 1 more

Process finished with exit code 1

为什么会发生？有人可以帮我解决这个问题吗？

Main.java

    public static void main(String[] args) throws InterruptedException,IOException{

        ProcessBuilder builder = new ProcessBuilder("echo", "This is ProcessBuilder Example");
        Process p=builder.start();
        int errcode = p.waitFor();
        System.out.println("Program is executed successfully?"+(errcode == 0 ?"No":"Yes"));
        System.out.println("Echo Output:\n" + output(p.getInputStream()));

    }
    private static String output(InputStream inputStream) throws IOException {
        StringBuilder sb = new StringBuilder();
        BufferedReader br = null;
        try {
            br = new BufferedReader(new InputStreamReader(inputStream));
            String line = null;
            while ((line = br.readLine()) != null) {
                sb.append(line + System.getProperty("line.separator"));
            }
        } finally {
            br.close();
        }
        return sb.toString();
    }

此代码是从https://examples.javacodegeeks.com/core-java/lang/processbuilder/java-lang-processbuilder-example/中检索的

Answer 1

echo不是有效的可执行文件，而是命令行外壳程序（cmd.exe）提供的命令。

为了从其他进程运行此命令，您必须启动cmd.exe并将参数传递给它。

Windows的工作代码如下：

ProcessBuilder pb = new ProcessBuilder("cmd.exe", "/C", "echo", "This is ProcessBuilder Example from JCG");

对于其他操作系统，您需要将cmd.exe替换为/bin/bash，等等。>