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Easy Learn Java: Programming Articles, Examples and Tips - Page 46


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I am reading my values from a db which is supposed to be a string, but sometime

Go to all tips in Databases

Question: I am reading my values from a db which is supposed to be a string, but sometime they can be doubles or something else...
How could I check if a string was double?

Answer: You can try to try to parse the String into a double and catch the exception:

String mystr="1.6";
try {
Double dbl = new Double(s);
// do smth. here}
catch (NumberFormatException ex) {
// d smth. else here
}

***************************************
Our older tips: March 22, 2001 - October 21, 2002 read here.
All published and not published on site tips you can find here



37 comments | Printer Friendly Page  Send to a Friend | Score: 0
Posted by jalex on Monday, April 28, 2003 (00:00:00) (4076 reads)

How do I attach a file to the HTTP POST request? I am using URLConnection to sen

Go to all tips in JSP, Servlets

Question: How do I attach a file to the HTTP POST request? I am using URLConnection to send the HTTP request.

Answer: you need to write code like this. Please find exact details yourself Smile
URL dest = "http://www.myurlhere.com ";
URLConnection urlCon = dest.openConnection();

// prepare input and output
urlCon.setDoInput(true);
urlCon.setDoOutput(true);

// Disable caching
urlCon.setUseCaches(false);

// Post output
DataOutputStream out =
new DataOutputStream(urlCon.getOutputStream());
out.writeBytes( file.toString );
out.flush();
out.close();

// return servlet response as a DataInputStream
DataInputStream in = new DataInputStream(urlCon.getInputStream());

// and so on
....

***************************************
Our older tips: March 22, 2001 - October 21, 2002 read here.
All published and not published on site tips you can find here



103 comments | Printer Friendly Page  Send to a Friend | Score: 1.5
Posted by jalex on Friday, April 25, 2003 (00:00:00) (6540 reads)

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