Re: HTTPUrlConnection does not download the whole page

The87Boy <>
Wed, 3 Feb 2010 10:21:20 -0800 (PST)
On 3 Feb., 17:25, Lew <> wrote:

The87Boy wrote:

I have a problem with this code, as you can see in print, where it
prints the error in the page's code:

What error? Why not copy and paste the error message in your post so t=

hat we

can actually have a prayer of helping you?

Actually there are no errors, but it fails when I try to print the
page as the System.err.println is printed inside the

public void print(String link) {

        String page = this.getPage(link);

You don't need to, and shouldn't, prefix member method calls with "this."=


For one thing, it's misleading in the presence of overridden methods, or =


'this' class doesn't override the method.

I did not know that, but it is easier to do in Netbeans ;)

        try {

            URL url = new URL(link);

            // Open the Connection
            HttpURLConnection conn = (HttpURLConnection)

            // Set the information
            conn.setRequestProperty("user_agent", =


(Windows; U; Windows NT 6.0; da-DK; rv: Gecko/20091016 Firefox/
3.5.4 (.NET CLR 3.5.30729)");
            conn.setRequestProperty("max_redirects", =


            conn.setRequestProperty("timeout", =



            // Connect

            // Get the Status-Code and add it to the HashMa=


            int statusCode = conn.getResponseCode();

            String page = this.getPage(conn.getInputStrea=


            pageEscaped = StringEscapeUtils.unescapeHtml(=



        } catch (IOException e) {System.err.println(e.getCause

You problem stems at least in part that you continue blithely along prete=


to process the URL after you catch an exception.

What appears in the error output from this block?

Oh, then I don't know how to make that method correctly

        return pageEscaped;

public String getPage(InputStream is) throws IOException {

As a matter of general guidance, public methods often better handle excep=


than pass them upstream. Certainly they should log the error before ha=


it, and if it must rethrow, often it's better to wrap the low-level excep=


('IOException') in an application-specific exception ('MyAppException').

There are use cases for rethrowing the low-level exception. It depends=

 on the

contract for the method - whether it's a low-level method itself.

Oh, I just thought I was better to catch all exceptions in GUI

        BufferedReader br = new BufferedReader(new InputStrea=


        String line = "";

This initialization is never used, so don't initialize 'line' to this val=


Oh, how is it then initialized in the while?

        StringBuilder sb = new StringBuilder();

        while ((line = br.readLine()) != null) {


It's a bit strange that you use '\n' as the line terminator when it's app=


from your code example that you're using Windows.

I think I just have to use a line terminator


        return sb.toString();

An alternative formulation for the loop that restricts the scope of 'line=

' to

just the loop is:

   for ( String line; (line = br.readLine()) != null; )
     sb.append( line + System.getProperty( "line.separator" );
     System.out.println(line); // Why?

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