Convert Java Code To Html – It’s a nice Sunday morning and you suddenly have an idea for your next big project: “How can I take the data given to company X and build an interface for it?” Get into coding and realize that Company X doesn’t offer an API for their data. Their website is the only source of data.
It’s time to go back to good old web scraping, the automated process of analyzing and extracting data from a website’s original HTML code.
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Jsoup, a Java library that implements the WHATWG HTML5 specification, can be used to parse HTML documents, find and extract data from HTML documents, and manipulate HTML elements. It’s a great library for simple web scraping because of its simple nature and ability to parse HTML just like a browser does, so you can use common CSS selectors.
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This article uses Maven as the build system, so make sure it’s installed. Note that you can use jsoup without maven. Instructions for this can be found on the jsoup download page.
You can find the app you build in this article on GitHub if you want to clone it and follow along, or you can follow the instructions to build an app from scratch.
, which is the latest version at the time of writing. Check which version is the latest by the time you read this by visiting the jsoup download page.
Web scraping should always start with a human touch. Before you jump right into coding, you should first familiarize yourself with the target website. Spend some time studying the site structure, figure out what data you want to scrape, and look at the source HTML code to understand where the data is and how it’s structured.
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In this article, you will analyze blogs and gather information about published blogs: titles, links, etc. It’s pretty basic, but it will help you on your web scraping journey.
Open the developer tools. Press the cursor icon in the upper left corner of the console. If you hover over an element on a web page while it’s active, it will find that element in the HTML code. This saves you from manually traversing the HTML file to determine which code corresponds to which element. This tool will be your friend throughout your scratching journey.
Now that you have an overview of the large target data structure on the website, it’s time to do some coding. Open the file
Jsoup works by parsing the HTML of a web page and turning it into a document object. Think of this object as a programmatic representation of the DOM. To create this
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The method works, but it is not very useful. How can you find the HTML of a web page and analyze it?
Note the amount of boilerplate code required to get HTML from a web page. Fortunately, jsoup offers a more convenient one
You can use this object to modify request properties, such as adding parameters using the data method, adding headers using the header method, setting cookies using the cookie method, and so on. Each method returns
The object offers several methods for selecting the desired node. If you know JavaScript, these methods will be very similar to the ones you are used to.
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It’s not very useful because there aren’t many elements with IDs, so let’s focus on the other important method: getElementsByClass. Again, it looks like there
In JavaScript, it takes a CSS selector and returns a list of elements that match that selection. In this case the title is
Tags within the blog element. To find a link, use the attr method, which returns the specified attribute of the first matching element. Because each blog has only one
It doesn’t work because there are two images: header and author avatar. Instead, you can use the First method to find the first matching element, or alternatively use SelectFirst:
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Now let’s try the author avatar. If you look at the URL of one of the avatars, you’ll notice that it contains the word “author”. So we can use attribute selector to select all images
To find this page. Since each page is a separate website, you can wrap everything into one
If you didn’t do this initially, you can clone this app from GitHub so you can check your code against it.
Jsoup is an excellent alternative for web scraping in Java. While this article introduces the library, you can find more information about it in the jsoup documentation.
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Although jsoup is easy to use and effective, it has its drawbacks. For example, it cannot run JavaScript code, which means that jsoup cannot be used to scrape dynamic web pages and single-page applications. In these cases you will need to use something like selenium.
We’ve also covered using JSoup with Scala, feel free to check out our article on Web Scraping with Scala.
Aniket is a postgraduate mathematics student with a passion for computers and software. He enjoys exploring different areas related to coding and working as a web developer using Ruby on Rails and Vue.JS.
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Wireless competitor monitoring with Integromat Rochester Oliveira Read 14 minutes Competitive analysis is a very important task in large or small companies. This allows you to confirm market needs by looking at what competitors are offering. An application for converting HTML to CSS and JavaScript. In the last blog I shared how to build a weather application in JavaScript, this is not the time to convert currencies using pure JavaScript.
In this application (JavaScript Currency Converter) you can enter your amount and convert your money into another country’s currency. You cannot leave the Amount field blank or enter 0 as the amount. If you do this, a “1” will automatically fill in the amount field.
You can easily change or reverse the currency of two countries by clicking on the exchange icon. If you don’t understand, you can watch the demo or video tutorial of this project (JavaScript currency conversion).
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In the video you see a demo video of this currency converter and how I made it using HTML CSS and JavaScript. I tried to explain the main line of JavaScript with written comments. I hope you will enjoy this project and understand the codes.
If you like this javascript currency converter and want to find the source code or file, you can find it at the bottom of this page. But before you go copy-coding the code or download the source file, let’s understand the main code and concept behind creating this project.
In the JavaScript file (country-list.js) I store all possible country and currency codes as objects. Then in the script.js file I first created an option tag and added these currency codes inside each option tag using for-in loops and placed those tags inside the selector tag.
Then I create a function and get the amount entered by the user. I then sent a request to the user to get the exchange rate API by selecting the currency code “in”. The API returned a country currency conversion rate object “in” the currency selected by the user.
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I first selected the currency conversion rate of user “a” and then calculated with the amount entered by the user and displayed it in the rate text. Once this is done, to exchange the currency codes, I simply reverse the “from” currency to the “to” currency and then call the function. For flags, I use the countryflags.io API to display the flag of the country selected by the user.
To create this project (Currency Conversion in JavaScript). First you need to create four files: HTML, CSS and JavaScript files. After creating these files, paste these codes into your file. You can also download the source code file of this currency converter from the given download button.
First, create an HTML file named index.html and paste the above code into your HTML file. Remember, you must create a file with a .html extension.
Second, create a CSS file named style.css and paste the above code into your CSS file. Remember, you must create a file with a .css extension.
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Third, create a JavaScript file named country-list.js and paste the above code into your JavaScript file. Remember, you must create a file with a .js extension. We will store all country and currency codes in this file.
Finally, create
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