What does java technology stack mean? Recognize all 9 mainstream technology stacks at once!

The Java technology stack refers to a set of technologies and tools widely used in Java development, including Java programming language, Java virtual machine, Java class library, Web development framework, database, IDE, etc. The Java technology stack is widely used in the development of enterprise-level Web applications. It has the characteristics of high reliability, strong maintainability, and good scalability. Next, the author will introduce the 9 mainstream technology stacks in Java, as follows:

　　1.Spring Framework

　　Spring Framework is one of the most popular application frameworks in Java, providing many functions such as dependency injection, aspect-oriented programming, data access, and Web development.

　　2.Hibernate

　　Hibernate is a popular object-relational mapping (ORM) framework that makes it easy for Java applications to access and manipulate databases.

　　3.Struts

　　Struts is an MVC framework for building Java-based web applications, providing a unified architecture to handle requests, responses, and data validation.

　　4.Apache Maven

　　Maven is a popular build automation tool that can be used to build, test and deploy Java applications.

　　5.Apache Tomcat

　　Tomcat is a popular web server and servlet container for running Java web applications.

　　6.JUnit

　　JUnit is a popular Java unit testing framework that helps developers write and run unit tests.

　　7.Log4j

　　Log4j is a Java logging framework that can be used to record information and errors generated when the application is running.

　　8.JavaFX

　　JavaFX is a framework for building rich, interactive graphical user interfaces (GUIs).

　　9.Apache Kafka

　　Kafka is a distributed stream processing platform that can be used to build a high-throughput, low-latency messaging system that supports large-scale data stream processing.

　　The following is a simple Java technology stack code example, using the Spring Boot framework and MySQL database:

　　First you need to create a Spring Boot application, you can use the following code to create a Spring Boot application called "demo":

@SpringBootApplication
public class DemoApplication {
  public static void main(String[] args) {
    SpringApplication.run(DemoApplication.class, args);
  }
}

　　Next, you need to create an entity class and a Repository class to handle database operations, you can use the following code:

@Entity
public class User {
  @Id
  @GeneratedValue(strategy = GenerationType.AUTO)
  private Long id;
  private String name;
  private String email;
  // getters and setters
}

@Repository
public interface UserRepository extends JpaRepository<User, Long> {}

　　Then you need to create a controller class to handle HTTP requests and responses, you can use the following code:

@RestController
@RequestMapping("/api/users")
public class UserController {
  @Autowired
  private UserRepository userRepository;

  @GetMapping
  public List<User> getUsers() {
    return userRepository.findAll();
  }

  @GetMapping("/{id}")
  public User getUser(@PathVariable Long id) {
    return userRepository.findById(id).orElseThrow();
  }

  @PostMapping
  public User addUser(@RequestBody User user) {
    return userRepository.save(user);
  }

  @PutMapping("/{id}")
  public User updateUser(@RequestBody User newUser, @PathVariable Long id) {
    return userRepository.findById(id).map(user -> {
      user.setName(newUser.getName());
      user.setEmail(newUser.getEmail());
      return userRepository.save(user);
    }).orElseThrow();
  }

  @DeleteMapping("/{id}")
  public void deleteUser(@PathVariable Long id) {
    userRepository.deleteById(id);
  }
}

　　Finally you need to configure the database connection and other application settings, you can use the following code:

spring.datasource.url=jdbc:mysql://localhost:3306/demo
spring.datasource.username=root
spring.datasource.password=123456

　　This code example demonstrates how to build a simple RESTful API using Spring Boot and MySQL, where Spring Boot is an important part of the Java technology stack, which simplifies the application development and deployment process.