Java正在覆盖文件

Question

I am trying to overwrite a file in Java. The problem is the overwriting is done within an OpenSSl process.

Runtime rt = Runtime.getRuntime();
         try {
            rt.exec(new String[]{"cmd.exe","/c","openssl enc -aes-256-cbc -nosalt -in \"" + source.getAbsolutePath()+
                    "\" -out \"" + source.getAbsolutePath()+".enc\""  + " -p -pass pass:" + Key});

        } catch (IOException e) {
            e.printStackTrace();
        }

Why the -out parameter does not get overwritten? When I execute the same exact code in cmd.exe it does overwrite it.

Answer 1

It's possible that an error is occurring but not being displayed. Try displaying the output of the ErrorStream :

Process process = rt.exec(...);

BufferedReader error = new BufferedReader(new InputStreamReader(process.getErrorStream()));
String errorLine = null;
while ((errorLine = error.readLine()) != null) {
   System.out.print(errorLine);
}

Also add this to verify they the array is what you think it should be:

System.out.print(Arrays.toString(new String[]{"cmd.exe","/c","openssl enc -aes-256-cbc -nosalt -in \"" + source.getAbsolutePath()+
                    "\" -out \"" + source.getAbsolutePath()+".enc\""  + " -p -pass pass:" + Key}));