Build a complete Java technology stack solution

Build a complete Java technology stack solution

In today's era of rapid development of information technology, Java, as a very popular programming language, is widely used Various fields. In order to build a complete Java technology stack solution, we need to cover all aspects, from back-end development to front-end presentation, as well as aspects such as data storage and security. This article will introduce a simple example to help readers understand better.

1. Back-end development

Java back-end development is an important part of building a complete solution. Here, we will use Spring Boot framework to implement backend services.

1. Create a Spring Boot project

First, we use Spring Initializer to create a new Spring Boot project. When creating a project, we need to add corresponding dependencies, such as Spring Web, Spring Data JPA, MySQL, etc.

2. Implementing back-end functions

Next, we will write some back-end function code. For example, create a User entity class:

@Entity
@Table(name = "users")
public class User {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Column(nullable = false, unique = true)
    private String username;

    @Column(nullable = false)
    private String password;

    // 省略构造方法、getter和setter方法等
}

Then, we create a UserService class to implement some basic user management functions:

@Service
public class UserService {

    @Autowired
    private UserRepository userRepository;

    public User createUser(User user) {
        // 执行创建用户操作
        return userRepository.save(user);
    }

    public User getUserById(Long id) {
        // 执行根据id获取用户操作
        Optional<User> optionalUser = userRepository.findById(id);
        return optionalUser.orElse(null);
    }

    // 省略其他方法...
}

The above is an example of a simple user management function, we Can be expanded according to actual needs.

2. Front-end display

When building a solution, front-end display is an integral part. Here, we will use the Angular framework to implement front-end display.

1. Create an Angular project

We can use Angular CLI to create a new Angular project:

ng new frontend

2. Implementing the front-end page

Next, we will create some front-end pages. For example, create a user list page to display all user information:

<table>
  <thead>
    <tr>
      <th>Username</th>
      <th>Password</th>
    </tr>
  </thead>
  <tbody>
    <tr *ngFor="let user of users">
      <td>{{ user.username }}</td>
      <td>{{ user.password }}</td>
    </tr>
  </tbody>
</table>

Then, we use Angular's HttpClient module to obtain the user data provided by the backend:

export class UserListComponent implements OnInit {

  users: User[];

  constructor(private userService: UserService) { }

  ngOnInit() {
    this.userService.getAllUsers()
      .subscribe(users => this.users = users);
  }
}

The above is a simple Example of user list page, we can expand it according to actual needs.

3. Data storage

Data storage is the core of building solutions. Here, we will use MySQL database to store data.

1. Create database

First, we create a MySQL database named "javastack".

2. Create data table

Next, we create a data table named "users" to store user information. The table structure is as follows:

CREATE TABLE users (
  id INT(11) PRIMARY KEY AUTO_INCREMENT,
  username VARCHAR(50) NOT NULL UNIQUE,
  password VARCHAR(50) NOT NULL
);

4. Security

The security of the solution is very important. Here, we will use Spring Security to protect the backend interface.

1. Configure security rules

First, we need to configure the corresponding security rules for the backend interface. For example, only authenticated users can access certain sensitive interfaces.

@Configuration
@EnableWebSecurity
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {

    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http.authorizeRequests()
            .antMatchers("/api/users/**").authenticated()
            .anyRequest().permitAll()
            .and()
            .formLogin().permitAll()
            .and()
            .logout().permitAll();
    }
}

2. Implementing user authentication

Next, we need to implement the logic of user authentication. For example, create an implementation class of UserDetailsService:

@Service
public class UserDetailsServiceImpl implements UserDetailsService {

    @Autowired
    private UserService userService;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userService.getUserByUsername(username);
        if (user == null) {
            throw new UsernameNotFoundException("User not found");
        }
        return new org.springframework.security.core.userdetails.User(
            user.getUsername(),
            user.getPassword(),
            Collections.emptyList()
        );
    }
}

The above is an example of a simple user authentication logic, which we can expand according to actual needs.

Through the above examples, we have built a complete Java technology stack solution. From back-end development to front-end presentation, to aspects such as data storage and security, we cover every key element of building a solution. Of course, in actual projects, it may need to be adjusted and expanded according to specific needs. I hope this article can help readers better understand and apply the Java technology stack.

The above is the detailed content of Build a complete Java technology stack solution. For more information, please follow other related articles on the PHP Chinese website!