What is Web Application Development?

A web application is an application that can be accessed through the web. The biggest advantage of the program is that the user can easily access the application. The user only needs to have a browser, and there is no need to install other software.

The application has two modes C / S, B / S. C / S is a client / server program, which means that such programs generally run independently. B / S is a browser-side / server-side application. This type of application usually runs with a browser such as IE. Web applications are generally in B / S mode. Web applications are primarily "applications", and are not fundamentally different from programs written in standard programming languages such as C, C ++, and so on. However, web applications have their own unique features, that is, they are based on the web, rather than running in the traditional way. In other words, it is the product of a typical browser / server architecture.

A web application is composed of various web components that accomplish specific tasks and expose services to the outside world through the web. In practical applications, web applications are composed of multiple

Step 1: Analysis

The first step in developing a web application is to analyze your needs. You should now define a list of features that your application should provide as thoroughly as possible. If you're doing this for a client, you need to understand what they want (make sure you both know what the other is saying). From your discussions, you can summarize the requirements and software specifications. Even if you develop for yourself, I suggest you write down the features you want this web application to do.

Step 2: Design

Once you have figured out what the web application needs to do, you can start designing. This step is usually repeated many times, each time to refine the design. The first thing you need to do is to draw a page flow chart (draw it on paper, or use software tools, as you like. I like to use paper so I can make faster changes). The page flow chart is usually a very abstract black and white drawing, drawing the look of the web application you will implement (you can add some color, but keep it as simple as possible).

This step lets you know what your application will ultimately look like. with

• Web applications don't need any complicated "expanding" process, all you need is a suitable browser;

• Web applications usually consume little or no hard disk space on the user;

• They do not need to be updated because all new features are executed on the server and are automatically communicated to the client;

• Network applications and server-side network products are easy to combine, such as email and search functions;

• Because they run in a web browser window, most of the time they are used across platforms (e.g. Windows, Mac, Linux, etc.)

• Web applications emphasize browser usability. If the browser side does not provide specific features, or deprecates a specific platform or operating system version (which makes it not applicable), it will affect a large number of users;

• Network applications rely on Internet remote server-side application files. Therefore, when the connection fails, the application will not work properly. However, if you use the HTML5 API, these applications can be downloaded and installed for offline use. Google Gears is a good example;

• Many network applications are not open source and can only rely on services provided by third parties, so they cannot be customized and personalized for users, and in most cases users cannot use offline, thus losing a lot of flexibility;

• They rely entirely on the availability of application service providers. If the company goes down and the server is stopped, users will not be able to recourse to previous information. In contrast, even if the software manufacturer fails, traditional installation software can continue to run, although it can no longer be updated or has other user services;

• Similarly, the provider company has greater control over the software and its functions. They can add new features to the software as long as they want, even if users want to wait for bugs to be resolved before updating. Skipping poor software versions is no longer possible. Companies can impose unpopular features on users, and they can reduce bandwidth at will to cut costs. Of course, the company will try to please users as much as possible-only in the case of competitors to provide better services and convenient transferability. Otherwise, the user has no choice but to bear it silently;

• Companies can theoretically retrieve any user behavior. This may cause privacy issues.

Browser / Server (B / S) can be applied well

web application application

By understanding what a browser / server architecture is, you understand what a web application is. Common counters, message boards, chat rooms, and forum BBS are all Web applications, but these applications are relatively simple, and the real core of a Web application is mainly to process the database and the Management Information System (Management Information System, referred to as MIS) is the most typical application of this architecture. MIS can be applied to local area networks and wide area networks. Internet-based MIS systems are increasingly used for their low cost, easy maintenance, wide coverage, and easy-to-implement functions.

web application application extension

The continuous development of informatization, Internet, mobile, and cloud computing has made the company's business needs more and more. Therefore, many companies' pages lose a large number of users because they lack a high degree of scalability. If you don't want to repeat the mistakes of these companies, you urgently need to find a way to expand your web applications.

For Web applications, scalability is important. As the user base and workload increase, the processor is increasing, and it should be able to scale. For Java applications, scaling is more complicated. It is not just a simple purchase and installation of 20 new processors. However, the Java platform can and does support application extensions through peripheral device languages such as Scala, Clojure, and Groovy. With the Java programming language, it is difficult for developers to make Java applications scale linearly.

In addition, the nature of on-demand cloud computing enables scalable web applications to be integrated into businesses of all sizes. Entering this field cannot be said to be without obstacles. Even small companies have difficulty obtaining such computing power, and data storage was once only applicable to enterprise users. This allows you to get the server space you want, not only cheaper than ever, but also easier. Cloud computing can order more resources, and is as convenient as driving through to order fast food ^[3] .