5 Ways to Request and Parse Web Data

5 Ways to Request and Parse Web Data

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.

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.

1. HttpURLConnection – Send and Receive Data

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.  

2. Gson – Map JSON to Objects

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.

3. Jsoup – Request and Parse Data in HTML

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().


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