java代码中执行liunx命令

 
public static String runShell(String command){
    try{
        String[] commands = isLinux()?new String[]{"/bin/sh","-c",command}:new String[]{"cmd","/c",command};
        Process process = Runtime.getRuntime().exec(commands);          
        InputStreamReader ir = new InputStreamReader(process.getInputStream());
        LineNumberReader input = new LineNumberReader(ir);
        String ln;
        StringBuilder result = new StringBuilder();
        while ((ln = input.readLine()) != null){           
            result.append(ln);
            result.append("
");                       
        }
        input.close();
        ir.close();
        return result.toString();           
    }
    catch(Exception e){
        e.printStackTrace();//log
        return null;
    }       
}
public static boolean isLinux(){
    String os = System.getProperty("os.name").toLowerCase();
    if(null != os && os.contains("windows")){
        return false;
    }
    return true;
}
null