Download URL content

Abstract: URL to download the contents of

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* Copyright (c) 2000 David Flanagan All rights reserved.
* This code is from the book Java Examples in a Nutshell, 2nd Edition.
* It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
* You may study, use, and modify it for any non-commercial purpose.
* You may distribute it non-commercially as long as you retain this notice.
* For a commercial use license, or to purchase the book (recommended),
* Visit http://www.davidflanagan.com/javaexamples2.
* /
Import java.io. *;
Import java.net .*;

/ **
* This simple procedure and the use of URL openStream () method to download
* URL content and copy the document or in the background.
** /
(Public class GetURL
Public static void main (String [] args) (
InputStream in = null;
OutputStream out = null;
Try (
/ / Detection parameters
If ((args.length! = 1) & (args.length! = 2))
Throw new IllegalArgumentException ( "Wrong number of args");

/ / Set the flow
URL url = new URL (args [0]); / / create URL
Url.openStream in = () / / open a flow
If (args.length == 2) / / output access to the corresponding flow
Out = new FileOutputStream (args [1]);
Else out = System.out;

/ / URL copy bytes to the output stream
Byte buffer [] = new byte [4096];
Int bytes_read;
While ((bytes_read = in.read (buffer))! = -1)
Out.write (buffer, 0, bytes_read);
)
/ / On exceptions, the print error message and usage message.
Catch (Exception e) (
System.err.println (e);
System.err.println ( "Usage: java GetURL [ ] ");
)
Finally (/ / Close always remember flow.
Try (in.close (); out.close ();) catch (Exception e) ()
)
)
)

Operation:

C: \ java> java GetURL http://127.0.0.1:8080/zz3zcwbwebhome/ home.html

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