Spring MVC Part 2 - Backend Web Development Utilization Technology

Timeleaf

Thymeleaf is a server-side view template for backend developers. With Thymeleaf, you can create dynamic HTML quickly and easily with only backend developers, without a separate frontend developer.

In this course, you will learn everything from the basic functions of Thymeleaf, to integration with Spring, and complex form management functions such as check boxes, radio buttons, and select boxes, through examples.

Messages, Internationalization

As web applications become larger and more complex, it becomes necessary to manage the various messages used in a consistent manner in one place. For example, if you want to change the word “product name” to “product name,” you have to modify the source code of many files. Using the message function provided by Spring, you can manage and modify these things at once.

Internationalization is the function of displaying a site in English for English speakers and in Korean for Korean speakers. Spring already provides this internationalization function. In this lecture, we will learn about the messages and internationalization functions provided by Spring step by step through real examples.

Validation

If a customer enters incorrect values in an input form when signing up for membership and sends them to the server, the server must verify the values and show the customer the input form again, kindly informing them of what was entered incorrectly. This is a necessary feature for all web services.

In this lecture, we will first develop these validation functions ourselves. Then, we will use the validation functions provided by Spring, and further, we will learn step-by-step through examples up to the Bean Validation function, which performs validation functions very conveniently with a single annotation.

Cookies, Sessions

HTTP is a stateless protocol. Therefore, in order to maintain the login function, concepts such as cookies and sessions are required. In this lecture, we will first create a login function using only cookies. Then, we will check what security issues there are and then create and apply sessions directly.

By going through the process of creating sessions in this way, you can gain a deeper understanding of how cookies and sessions work. In addition, you will learn and apply sessions provided by servlets.

Filter, Interceptor

We will learn about filters provided by servlets and interceptors provided by Spring through examples.

First, let's create a function to log all the simplest HTTP requests using filters and interceptors, and then create a function for authentication processing using filters and interceptors as well. By using them together like this, you can clearly understand the pros and cons of each.

Exception handling

When learning web applications, the most difficult part to understand is exception handling. This is because the servlet container (WAS) and Spring MVC each provide their own exception handling methods. And in reality, these two are mixed and the exception handling mechanism operates in a complex manner. Therefore, it is very difficult for developers to accurately understand and use how Spring and the servlet container each operate internally when an exception occurs in the controller.

In this lecture, we will explain step by step from exception handling in servlet containers to exception handling in Spring MVC. So after listening to the lecture, you will clearly understand how the server works when an actual exception occurs and what points to change. In addition, exception handling when using the API is also explained.

Spring type converter

When developing an application, there are many cases where you need to convert types, such as converting characters to numbers or vice versa. For example, even if the character "10" is passed in an HTTP request, Spring can receive it as the number 10, which is an Integer type, with @RequestParam. Spring provides a feature called type converter to support consistent type conversion.

Type converters are often mentioned when learning Spring, but it is not easy to understand in depth how they actually work. Through this lecture, you can understand the basics of type converters and their use step by step through examples.

File Upload

There are numerous file upload examples on the Internet. In this lecture, we will go beyond simply explaining the file upload function and explain in depth the protocol used for file upload and the principle of file upload in HTTP. And we will learn the file upload function step by step through examples, starting from servlet to convenient file upload method provided by Spring.