使用 exec('command') 方法从 java 执行 linux 命令

Question

I am trying to execute a Linux command from my java class using the method exec() from the Runtime class in this way:

public static String xxUtilInfoFile  (String sPath , String sFileName) throws Exception
{            
    Runtime r = null;
    Process p = null;   
    String line_value="";
    String output_data="";

    /*execute the process*/
    r = Runtime.getRuntime();
    p = r.exec("file -bi " + sPath + sFileName);
    p.waitFor();

    /*Return the standard error output*/
    BufferedReader in=new BufferedReader(new InputStreamReader(p.getInputStream()));
    output_data = in.readLine();

    return output_data;        
}

The Linux command I want to use is file -bi fileName and it runs well except in the case the fileName has blanks inside, and that is the point.

I've already tried to use double quotes and backslash ( \ ) because this method runs in the Linux bash console, but it doesn't run if I pass it as an argument of exec method.

Could anyone help me to resolve this issue?

Answer 1

Maybe you can use ProcessBuilder class.

Answer 2

Perhaps, you should pass an array of Strings to the exec() method at line 9 of your code:

p = r.exec(new String[]{ "file", "-bi", sPath, sFileName});