I need to retrieve the images which is stored in my oracle 11g R2 database. I'm trying to retrive the images using Jquery and servlet, And placing into the css division. But I'm a newbie in this. I know using json objects we can do this stuff. Please anyone tell me how to do
Make a request that returns a list of the names of all images (so that you know what to retrieve)
Make a servlet that serves images - gets the name as GET parameter, looks it up in the database (e.g. via JDBC) and streams the result back into the response.getOutputStream(), and set the correct content type
Related
I need to retrieve rows in database with a image saved in byte array. How do I display the image using Strut2?
I have displayed it by using custom result. I passed the id and make an action search for it in the database. My problem is how to invoke this several times? I have an action that retrieve all the rows. How to call display image action from the list action? Or is there a better way to achieve this?
JAVA
My action has an list of the objects I want to show on JSP.
JSP
First way: I use iterator tag and on each iteration I want to display the image which is in byte array. I want call the action to retrieve the image here.
Second way: I tried this post and it is not working for me.
<img src="data:image/jpg;base64, <s:property value="imageData"></s:property> />" >
Image data is the image in string.
To retrieve rows in database there's many ways but all of them utilize JDBC API. You can map the object as an image array containing bytes or blob or clob data that you persist in the database.
Displaying the images required to send it to the browser. In the Struts2 there's a stream result type that could be used to output the image data to the browser.
Or use the Servlet API to transmit the data on the JSP similar like in How to send and display image from action class to JSP in Struts 2 answer.
Combining the experience from the answers that you already enlighten in the question to stringify data you may achieve suitable results.
I am writing an Android RSS reader. It uses webview to display each article. To identify the most read news I load a fake image from my server like:
<img src='http://example.com/update_read_count.php?article_id=1234'>
At the server I will increment the view counter.
Is there a way I can respond back with the number of times it has been read. Or is there a way I can update a DOM element inject this count in the page?
Since it is an image, the only way you could do that would be to generate an image containing the text you wanted on the server. e.g. with this function.
If you wanted to update the DOM, you'd need to get the data in a more useful format. Using XMLHttpRequest to fetch the data and then returning it in JSON format would be traditional.
I need to pass a bunch of parameters to a web API method which returns a byte array that is needed to display a PDF report on a page. I tried doing this via a GET method but the query string is too long and it throws an exception. I have tried shortening the query string as much as physically possibly but it is still too long. All of the external PDF viewer libraries require a string path to the PDF. I need something that allows me to supply a string path and some parameters or just a string path but that uses a POST instead of a GET. I was thinking about POSTing the object values to the web API along with a GUID and storing it somehow on the server then with an tag calling another API method and retrieving the stored data by only passing the GUID as a parameter but I don't want to make a database table for only that to save and retrieve the data. I entertained the idea of saving the byte array to a PDF on the server and then simply pointing a PDF viewer to that after but I had no success with that either and that is not ideal.
File.WriteAllBytes(path, res);
The code above is the most common way I have found to save the file but when I open the new PDF file after it says it is corrupt and it won't allow me to open it. Ideally I would just find a method that allows me to POST data to my web API then embeds the result in a pdf.js/pdfObject/ control. Please help, this has stumped me for days. Thanks in advance!!
So I have this webpage that I'm making which allows people to create elements on the page on the fly. And I want to be able to save those elements to my server and whenever someone else reloads that page, the webpage will have those saved elements.
I'm not a good web programmer by any means, so take it easy with the web jargon xD
The user created elements are nested 's or lists. Those elements can be deleted at anytime as well.
So I was reading about saving them as JSON but how would I go about doing that as my 's, most of the top level ones will have the same class. Never worked with JSON before, so I'm a real noob at that.
Will the server file keep replacing itself with a brand new copy with each addition/deletion?
And I'd like to get a little help with showing the new elements without updating. On other users page. I read about AJAX real-time updating, like APE, but have no idea how to go about with that. (This is not really needed but would be a nice one to have)
If someone can guide me a little at least, that will be great. Thanks.
The best suitable way to accomplish this is by saving your objects attributes to a database, however other options include XML files etc..
The process of accomplishing it through database is:
If you want to save data to database then you will have to use a server side language like Php or Asp.net, so first step will be to have a database then an active connection to your database on your intermediate file (lets say 'data.php')
Then you need to code your data.php file so that it can take input(usually through GET or POST method) and it can save it to your database
Then you need to pass your data (objects attributes) through AJAX to data.php and save them to your database
On the main file you will have to check whether already some data exists for user, if yes then fetch it from database and display objects accordingly, otherwise set the objects preferences to default
I was able to extract user information from the social Graph API and display it on my site within tags . How do I now get this information, and use it in a PHP script? In other words, say I want to use PHP to calculate the weather, but only based on the preferred weather on a users facebook profile(hypothetical situation). Now, assuming I have obtained the users preferred weather using javascript, how do I use PHP to get that information in order to perform my calculations? I guess one way would be to use regular expressions to match the values on the same page, but that seems tedious. Any help/direction is appreciated.
Are you using php to access the Facebook API or the pre built HTML they provide? You should use php to retrieve the data, do what you need to do with the data, and then display it on a webpage, rather than the other way around.
You can use javascript to get the data, then send it to your php script using AJAX, but this is a round-about way of doing it.
You can make the call the to the Graph API directly from your PHP script. Something like this:
$r = new HttpRequest('https://socialgraph.googleapis.com/<method_name>', HttpRequest::METH_GET);
You will need to parse the data when you get the response -- json_decode() should do the trick.