Information Technology Tips

Here is an code snippet for extracting image src from html. private static final Pattern IMG_SRC_PATTERN = Pattern.compile("<img\\s+.*src\\s*=\\s*('|\")(.+?)\\1.+?>"); public static List<String> extractImgSrces(final String content) { List<String> list = new ArrayList<>(); final Matcher matcher = IMG_SRC_PATTERN.matcher(content); while(matcher.find()){ list.add(matcher.group(2)); } return list; } The example usage is below. In this example, you should only prepare HttpUtils.getStringContentsFromURL method, which is getting html from given url, for your self. public static void main(String[] args) throws URISyntaxException, IOException { extractImgSrces(HttpUtils.getStringContentsFromURL("http://www.google.com/", "utf-8")).stream().forEach(System.out::println); }

Sometimes, You might want to set revision number for svn-external repository explicitly. In that case, you should just set svn-external with "-rXXXX" on your svn property (XXXX is the revision number you want to set)! I confimred it worked perfectly on windows, linux svn client. lib -rXXXX [svn-external target url]

Some pages in amazon provide images which user can zoom on, like this page. The question is "Where is the original hi-resolution image?". You can easily find the explanation page for how to construct url for original hi-res image. (See this stack overflow page .) In this post I will show you the code snippet for getting original hires imgae from ASIN code. Note!: This method might be unavailable if amazon change the implementation of zoom and hires image url construnction. Code Actually code is nothing special. Just find " DynAPI.addZoomViewer( " . // pattern for extracting image code used for retrieving original image. private static Pattern AMAZON_ZOOM_IMAGE_PATTERN = Pattern.compile("DynAPI\\.addZoomViewer\\(\".+/(.+?)\",\\s*(.+?),\\s*(.+?),\\s*(.+?),\\s*(.+?),\\s*(.+?),.*\\)"); public static String findOriginalZoomImageUrl(String asin, String country) { String url = getAmazonZoomImageWindowUrl(asin, country); try{ ...

This is just a quick tips... I think you can easily understand whole thing from the code below. // example data used for get parameters. You can use plain javascript object if you want. var map = ["name1":"value1", "name2":"value2"]; // Ok, let’s build string... var parameters = []; for(var prop in map) { // if the name part (prop) contains the characters to uri encode, // use encodeURIComponent as well for the name part. parameters.push(prop + "=" + encodeURIComponent(map[prop])); } var parametersStr = parameters.join("&");

Recently I realized that Amazon offers high resolution photos in some products. I have found the way to extract these hires images. Note Note!: This method might be unavailable in the future because Amazon may not like this kind of hack or change the implementation :P Basic Strategy For example, this page: http://www.amazon.com/Silver-Violin-Nicola-Benedetti/dp/B008CYV046/ If you see the html source of this page, you can find the following json string. var colorImages = {"initial":[{"large":"http://ecx.images-amazon.com/images/I/XXXXXXX.jpg",.... It represents the urls of various size of images. If you would like to see the hi-resolution image, you should pick up the url which is defined in hiRes property. Source Code You know I still like Java, I will show you the simple Java code. I use Jackson for parsing JSon string. import java.io.IOException; import java.net.URISyntaxException; import java.util.ArrayList; import java.util.List; imp...

If you need to set proxy address on Java HttpURLConnection. Do something like below. public static String getString(String urlStr) throws Exception { HttpURLConnection connection = null; InputStream is = null; try { URI uri = new URI(urlStr); // settin proxy String proxyHost = ""; // your proxy serever address int proxyPort = 8080; // your proxy port Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(proxyHost, proxyPort)); // open connection with passing Proxy Object connection = (HttpURLConnection)uri.toURL().openConnection(proxy); connection.connect(); is = connection.getInputStream(); String content = toString(is); return content; } finally{ closeQuietly(is); if(connection != null) { connection.disconnect(); } } } private static String toString(InputStream is) throws IOException { byt...

I tried to implement very simple html edit text area which has available tags user can input are restricted. So I needed to implement a validator which detects tags not allowed to use. The proper (but a bit heavy) implementation approach is using Tidy . It can validate entire html and also fix and clean up html source! However in my case using tidy is a bit overkill solution. Instead of using tidy, I decided to use strip_tags function. The disadvantage is that the function does not validate html syntax. e.g. inaccurate than using tidy.- "strip_tags function does not actually validate the html, partial or broken tags can result in the removal of more text/data than expected." as the official PHP document says. Okie, as long as we understand the disadvantage, we can use this function. Let's show you the code. function validateOnlyAllowedTags($html, $tags) { $stripped = strip_tags($html, $tags); // if no tags are stripped, the length of html contents ...