This article details the 5 ways to request and parse data from the internet. The article includes codes to make requesting and parsing data easy to do. Surely you will have a completely different view after reading our article. Let's explore it with us now.
HttpURLConnection has been part of Java JDK since version 1.1. It provides methods to send GET/POST requests and receive responses over HTTP protocol. They work with methods in BufferReader and InputStreamReader to read the data. You don’t need any external libraries.
The data you receive have different formats, such as plain text, HTML, XML, JSON, pdf, and jpg, etc. How would you like to extract the exact data you want? If it is plain text, you can use the String methods, such as indexOf() to find or use substring() to extract.
XML used to be a popular data transfer format. Today, JSON is preferred for data transfer because it is easy to read and parse. For each JSON data item, you can use libraries such as Jackson or Google Gson to map JSON data items to Java objects for the process.
If the data format is HTML, Jsoup is a good tool because it provides both retrieval and parse. Therefore, Jsoup is the ideal tool for web scraping or web crawling. To set up, you can download Jsoup here. If you use maven, you can add the following in pom.xml.
To use it, you map the page to Jsoup Document. Then you can retrieve the whole page by HTML(). If you want to retrieve some elements on the page, you can specify by using select().
Browser Automation With Selenium and Java. These statistics emphasize how relevant user experience has become for online businesses. Booking travel tickets, online purchase & payment, filling out applications etc. are done in a single click within fraction of seconds through different websites.
Web automation and web scraping are quite popular among people out there. That’s mainly because people tend to use web scraping and other similar automation technologies to grab information they want from the internet. The internet can be considered as one of the biggest sources of information. If we can use that wisely, we will be able to scrape lots of important facts. However, it is important for us to use appropriate methodologies to get the most out of web scraping. That’s where proxies come into play.
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