如何从Java代码运行Linux程序

I am trying to create a disk space from Java code using qemu-img so I instantiated process and runtime classes. When run the program the command is not executed though I used the same mechanism for similar execution and it work fine. So I am wondering whether I miss something here.

我正在尝试使用qemu-img从Java代码创建一个磁盘空间，以便实例化流程和运行时类。当运行程序时，命令不会被执行，尽管我使用了相同的机制进行类似的执行，并且它工作得很好。所以我想知道我是否漏掉了什么。

StringBuilder commandBuilder = new StringBuilder("qemu-img create -f "+chosenStorageType+" ~/"+storageName+".img "+storageSize+"M");
System.out.println(commandBuilder);
String command = commandBuilder.toString();
System.out.println("this is the correct one: "+command);

System.out.println("Creating the image...");
Runtime runtime = Runtime.getRuntime();
Process process = null;
try {
    process = runtime.exec(command);
    System.out.println("from process try..catch");
} catch (IOException e1) {
    e1.printStackTrace();
    System.out.println(e1.getMessage());
}finally{
    System.out.println("from finally entry");
    process.destroy();
}

the output is as following:

输出如下:

qemu-img create -f raw ~/testSPACE.img 23.0M

this is the correct one: /qemu-img create -f raw ~/testSPACE.img 23.0M
Creating the image...
from process try..catch
from finally entry

But if I go to the directory the file isn't created.

但是如果我去目录，文件没有被创建。

Just to test it if I copy the output into terminal everything works like a charm.

为了测试它，如果我把输出复制到终端，一切都像魔法一样。

1 个解决方案

#1

The tilde (~) here

波浪号(~)

" ~/"+storageName+".img "

is interpreted by the shell as meaning your home directory. I would substitute the real path.

被shell解释为您的主目录。我要用实路径代替。

Note also that you need to be consuming the process stdout/err, and collecting the error code of the process (and checking it!) via Process.waitFor()

还要注意，您需要使用进程stdout/err，并通过process . waitfor()收集进程的错误代码(并检查它!)

#1