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# Spring Cheatsheet

## Unique Features

- Java-based web framework
- Inversion of Control (IoC) container
- Model-View-Controller (MVC) architecture
- Spring Boot auto-configuration
- Spring Data JPA
- Spring Security

## Controllers

// Define a controller

@Controller

public class ControllerName {

@GetMapping("/url")

public String functionName(Model model) {

// Controller body

return "template";

}

}

## Views

<!-- Thymeleaf syntax -->

<div th:each="item : ${items}">

<span th:text="${item.attribute}"></span>

</div>

## Forms

<!-- HTML syntax for form -->

<form method="POST" action="/url">

<input type="text" name="field_name">

<button type="submit">Submit</button>

</form>

<!-- Handle form submission in controller -->

@PostMapping("/url")

public String functionName(@ModelAttribute ModelName model) {

// Form handling code

return "success";

}

## Database

// Connect to a database

spring.datasource.url=jdbc:mysql://localhost:3306/db_name

spring.datasource.username=username

spring.datasource.password=password

// Define a model

@Entity

public class ModelName {

@Id

@GeneratedValue(strategy = GenerationType.AUTO)

private Long id;

private String field_name;

}

// Create a migration

spring.jpa.hibernate.ddl-auto=create

## Authentication

// User registration

@PostMapping("/register")

public String registerUser(@ModelAttribute("user") User user) {

userService.save(user);

return "redirect:/login";

}

// User login

@GetMapping("/login")

public String login(Model model) {

model.addAttribute("user", new User());

return "login";

}

@PostMapping("/login")

public String loginUser(@ModelAttribute("user") User user) {

if (userService.authenticate(user)) {

return "redirect:/home";

} else {

return "redirect:/login";

}

}

// User logout

@GetMapping("/logout")

public String logout(HttpSession session) {

session.invalidate();

return "redirect:/login";

}

## Resources

- [Spring Documentation](https://spring.io/docs)
- [Spring Boot Tutorial](https://spring.io/guides/gs/spring-boot/)
- [Spring Data JPA Tutorial](https://spring.io/guides/gs/accessing-data-jpa/)
- [Spring Security Tutorial](https://spring.io/guides/gs/securing-web/)