Question

I’ve been trying to make it where I can download a .exe file from the web, read it, and write it to a file locally, and then execute.

URL url = new URL("http://www.ddlands.com/downloads/Calc.exe");
    URLConnection c = url.openConnection();
    BufferedReader br = new BufferedReader(new InputStreamReader(c.getInputStream()));
    String line = "";
    File file = new File("analbread"+".exe");
    BufferedWriter bw = new BufferedWriter(new FileWriter(file));
    while((line = br.readLine()) != null){
        bw.write(line + "\n");
    }
    br.close();
    bw.close();
    Process r = Runtime.getRuntime().exec("analbread" + ".exe");
    System.out.println(r.toString());
    System.out.println("WORKS!");

Although I know that doesn’t work due to using BufferedWriter, and i’m not sure if it runs the exe.

Answer 1

For the downloading part, you’ll need to use binary read/write. See this for further details: Working unbuffered streams.

For the executing part, the problem is that the Runtime.exec()-method can’t launch your executable file.

At least under Linux (I can’t test it on Windows), you’ll need the full path to the executable file (or use ./[file] when the file is in the same directory as your application) to be able to execute it.

Only giving the command works for executables which are part of your systems PATH-variable.