从JAVA问题执行Unix系统命令 [英] Execute Unix system command from JAVA problem
问题描述
从JAVA代码执行系统命令时，我遇到了一个奇怪的问题.
实际上，我想从我的JAVA应用程序中获取Mac OSX系统信息.
为此，我使用
I am facing a weird issue with executing a system command from JAVA code.
Actually i want to get the Mac OSX system information from my JAVA App.
For that im using
Runtime.getRuntime().exec("system_profiler -detailLevel full");
这工作正常.如果我打印输出，那很酷.
但是我想将此信息写入plist文件以供将来使用.为此，我使用system_profiler .like，
This is working fine.If i print the output,it is cool.
But i want to write this information to a plist file for future use.For that im using the -xml argument of system_profiler.like,
String cmd = "system_profiler -detailLevel full -xml > "+System.getProperty( "user.home" )+"/sysinfo.plist";
Process p = Runtime.getRuntime().exec(cmd);
基本上，这应该在当前用户的主目录中创建一个plist文件.
Basically this should create a plist file in the current users home directory.
但是，这似乎没有在文件中写入任何内容.
But this seems to be not writing anything to file.
我在这里想念什么吗?
推荐答案
我的Java不仅生锈，所以请保持柔和. ;-)
My Java is more than rusty, so please be gentle. ;-)
-
Runtime.exec()不会自动使用外壳执行您传递的命令，因此IO重定向没有做任何事情.
Runtime.exec()does not automatically use the shell to execute the command you passed, so the IO redirection is not doing anything.
如果您仅使用:
"/bin/sh -c system_profiler -detailLevel full > path/file.plist"
然后该字符串将被标记为:
Then the string will be tokenized into:
{ "/bin/sh", "-c", "system_profiler", "-detailLevel", "full", ">", "path/file.plist" }
这也是行不通的，因为-c只需要一个参数.
Which also wouldn't work, because -c only expects a single argument.
尝试以下方法:
String[] cmd = { "/bin/sh", "-c", "system_profiler -detailLevel full > path/file.plist" };
Process p = Runtime.getRuntime.exec(cmd);
当然，您也可以使用Process.getInputStream()读取Process实例的输出，并将其写入所需的文件中.因此，完全跳过外壳程序，IO重定向等.
Of course, you could also just read the output of your Process instance using Process.getInputStream() and write that into the file you want; thus skip the shell, IO redirection, etc. altogether.
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