Java - Very simple HTTP file downloader

Simple HTTP File Downloader (Full Code provided below)

1. Create a URL object. (Example: URL obj = new URL("http://example.com");)
2. Create HttpURLConnection object 'conn'.
3. Open the connection of URL object and pass to the conn. (Ex: conn=obj.openConnection();)
4. Set requestMethod property of 'conn' to "GET".
5. 
   
6. Set setDoOutput property of conn to true.
7. Get responseCode of 'conn' to any integer variabe.
8. Get fileSize by using getContentLength()
9. Create a array variable byte of 1024 byte to get chunk of file from internet.
10. Get these chunks continuously and put this in a file.
11. Close files and connection. 

Full Code:
import java.io.BufferedInputStream; import java.io.FileOutputStream; import java.net.HttpURLConnection; import java.net.URL; class DownloadTest{ public void startDownload(String url,String fileName){ URL obj; HttpURLConnection conn=null; double fileSize=0,downloaded=0; BufferedInputStream in; try{ obj=new URL(url); conn = (HttpURLConnection) obj.openConnection(); conn.setRequestMethod("GET"); conn.setRequestProperty("User-Agent", "myJavaDownloader"); conn.setDoOutput(true); int responseCode = conn.getResponseCode(); fileSize = conn.getContentLength(); System.out.println("Connected to server...."); System.out.println("File Size: " + (fileSize/1024) + " KB"); in = new BufferedInputStream(conn.getInputStream()); FileOutputStream fos = new FileOutputStream(fileName); byte[] buffer = new byte[1024]; int len= in.read(buffer); downloaded = downloaded + len; while(len != -1){ fos.write(buffer, 0, len); len = in.read(buffer); downloaded = downloaded + len; System.out.println("Downloaded: " + (downloaded /1024) + " KB"); } in.close(); fos.close(); return 0; }catch(Exception e){ System.out.println("An Error occured while downloading...."); return -1; } } public static void main(String args[]){ DownloadTest dt=new DownloadTest(); int m = dt.startDownload("http://example.com/m.zip","d:\path\to\m.zip"); if(m==0){ System.out.println("File downloaded successfully."); }else{ System.out.println("File not downloaded."); } } }

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