Umgebungsvariablen sind eine hervorragende Möglichkeit, Java-Anwendungen zu konfigurieren, ohne Einstellungen explizit in Code speichern zu müssen, z. B. für Datenbank- und Caching-Server oder für APIs von Drittanbietern.

Solche Einstellungen außerhalb des Codes vorzunehmen hat mehrere eindeutige Vorteile:

• Bei Änderungen der Einstellungen muss der Code nicht aktualisiert und erneut kompiliert werden.
• Die Offenlegung sensibler Anmeldeinformationen wie Benutzernamen und Passwörter sowie von Tokens wird verhindert.
• Derselbe Code kann in mehreren Umgebungen bereitgestellt werden.

In diesem kurzen Artikel werde ich Ihnen einige der Möglichkeiten zeigen, wie Sie mit Umgebungsvariablen in Java arbeiten können.

Zugriff auf Umgebungsvariablen in Java

Eine der häufigsten Methoden ist die Verwendung von System.getenv(), die ein optionales Argument des Typs String akzeptiert. Je nachdem, ob ein Argument des Typs Stringübergeben wird, werden unterschiedliche Werte von der Methode zurückgegeben. Genauer:

Wenn ein String übergeben wird und er mit einem Schlüssel in der Map der internen Umgebung übereinstimmt, wird dessen …

Ahoy, operator. Congratulations on gaining acceptance into the Arcane Academy of API Arts. I’m Professor Taifa Omar Warsame, head of House Turing. In House Turing, we believe that code is for people. If code isn’t human centered - if it’s not helping people have fun, work smarter, or live better, it’s not that interesting. That’s why, in House Turing, we love SDKs and helper libraries. They help make working with APIs easier and more readable for the humans behind the code.

For creatives such as myself, writing code can be a form of art and expression. It's another medium to bring ideas to life, whether it be a data visualization or small click based game …

It might seem intimidating to build projects using Java especially when it seems confusing to know how to start and set up. Fortunately, using the Spring Boot and ngrok tools will reassure you that writing code for Java applications can be fast and seamless.

Spring Boot reduces the problem of figuring out how to structure the project hierarchy and provides sufficient documentation for developers to create standalone applications without relying on external web servers.

Many articles on the Twilio blog utilize ngrok, a localhost tunneling tool that exposes webhooks on public URLs that can be reached by Twilio. The excellent ngrok tool is also used to generate temporary public URLs for your development web server.

In this article, you will learn how to set up a Java Spring Boot application and create a tunnel from a URL on the ngrok.io domain to the local application running on your computer. …

Offices are opening up again! As employees are slowly going back to work in the office, local businesses are blooming with an influx of customers and new food orders. Allow Twilio to assist you in making your next lunch run with a quick and accessible way to view those elaborate orders on your phone when you're in line.

In this article, you will learn how to make a list to add and view from your phone using Twilio SMS and Java.

Prerequisites

• Java Development Kit (JDK) version 8 or newer.
• Maven 3.3 or newer.
• IntelliJ IDEA Community Edition for convenient and fast Java project development work. The Community Edition is sufficient for this tutorial.
• A free or paid Twilio account. If you are new to Twilio, get your free account now! (If you sign up through this link, Twilio will give you $10 credit when you upgrade.)
• ngrok, …

Twilio is a customer engagement platform providing programmable communication tools for making and receiving phone calls, sending and receiving text messages, and performing other communication functions using its web service APIs. Twilio conveniently empowers communication in any language.

With the help of the Twilio SMS API, Java, and the Spring Boot framework, you can send SMS with a text message. This article will help you set up a Spring Boot application that will expose a REST API to send the SMS. You will also be using the Twilio Java Helper Library.

In this article, you will learn how to navigate a Java IDE to set up and build a Spring Boot application and send an SMS to your mobile device. Find the code for the article on GitHub.

Tutorial Requirements

• Java Development Kit (JDK) version 8 or newer.
• Spring Tool Suite (STS) for convenient and fast …

Approximately Two billion people across the globe use WhatsApp as a communication medium. It is fast and a convenient app to use as it does not only provide peer to peer messaging, but it is also used by companies and entrepreneurs to run their businesses through WhatAapp business. Over the years, WhatsApp has proven to be an important tool to engage with customers as at least more than 58% of its users use it more than once in a day.

The Twilio WhatsApp Business API is handy and secure and enables you to accomplish a number of tasks including sending and receiving media files, sharing map locations and driving engagement with your users. It is a great enabler for businesses worldwide. So, why not scale your business and leverage tools that have proven to work over time?

In this tutorial, I will take you through how to send a …

When developing applications it is crucial for a developer to understand the abstractions behind the libraries that are used in the application. This will help the developer understand the code better and assist them in writing efficient applications.

In this tutorial, you will learn how to write custom queries using JdbcTemplate which is a wrapper class for writing row JDBC queries. There are other implementations that are much more convenient than JdbcTemplate such as Hibernate and the Java Persistence API (JPA) because these API’s hide the actual implementations from the developer and only expose the necessary details such as the methods to insert, update and delete records from your database.

When you decide to use JdbcTemplate as opposed to Hibernate and the Java Persistence API you are prone to have boilerplate code in your application. The benefit of using JdbcTemplate is that it provides low level access to your queries …

本稿では、Spring BootでWebSocket APIを使用し、シンプルなSMS送信アプリケーションを構築する方法について説明します。

WebSocketは、サーバーとクライアント間の双方向通信チャネルを確立する通信プロトコルです。WebSocketは、現在一般的に使用されているブラウザのほとんどにおいてサポートされています。

プロジェクトの設定

まず、Twilioアカウントの登録と電話番号を取得します。

Twilioのアカウントを登録します。Twilioホームページをブラウザで開き、[今すぐ無料サインアップ]ボタンをクリックするか、Twilioアカウントの作成リンクからサインアップします。このリンクを使用するとアカウントのアップグレード時に$10(米国ドル)相当分のクレジットが追加で付与されます。

次に、SMSの送信に使用する電話番号を購入します。

TwilioコンソールのBuy a Numberにアクセスします。

Countryで、電話番号が属する国を選択します。現在、TwilioではSMS送信機能付きの日本の電話番号は販売していませんので、米国等を選択してください。

各国の電話番号で使用できる機能について詳しくは、TwilioヘルプセンターのTwilioの国際電話番号の利用と機能(英語)を参照してください。

CapabilitiesでSMSがチェックされていることを確認してください。

購入した電話番号をコピーし、記録しておきます。

Spring In …

In the early years of my career, getting started with testing my code felt like trying to break through a brick wall. To hopefully make your experience less painful, here is an attempt at the introduction I was given to this important topic.

In this article, you will learn how to write code which is easily testable and how to test it using a single tool: JUnit 5.

Prerequisites

• Java Development Kit (JDK) version 8 or newer.
• JUnit 5.8.2 (though most versions of JUnit 5 should work).
• An IDE with JUnit integration is recommended, such as Eclipse, Intellij IDEA, Android Studio, NetBeans. This article will make references to IntelliJ IDEA.
• A build tool is recommended, such as Gradle or Maven to manage the JUnit 5 dependency.

Why You Should Care About Testing

Anytime you write application code that is deployed and used, it is being tested. Whether you …

もうずいぶん前からTwilioのREST APIを使用していますが、HTTPでクライアントとサーバー間の通信を確立する際にREST APIがどのように使用されているかを見るといつも驚きます。APIを呼び出すと、サーバーが呼び出されます。次に、サーバーがビジネスロジック全体を実行し、結果を返します。

自分でAPIを作成できるように、これらのAPIがどのように開発されているかを常に知りたいと思っていました。これが分かれば、Spring Bootなどのさまざまなフレームワークを探求できます。そこで、Spring Bootを使用してREST APIを開発し、初心者がSpring Bootを使い始めるのに役立つこのチュートリアルを作成することにしました。

このチュートリアルでは、Spring BootでREST APIを開発し、従業員データベースでCRUD操作を実行する方法をご紹介します。

必要条件

• Javaに関する予備知識または学習意欲。
• Java Development Kit(JDK)バージョン8以降。
• Maven 3.3以降
• MySQL。MySQLで従業員データを保存し、REST APIでアプリケーションにアクセスします。MySQLの設定をWorkbenchで行う手順については、ガイドに従ってください。
• コード開発用のEclipse IDE。インストーラを実行すると、インストールする具体的なパッケージが求められるため、[Eclipse IDE for JavaEEDeve …