day01_springboot综合案例

**Day01 SpringBoot综合案例**

### 前言本文将介绍Spring Boot的基本概念、配置以及如何使用Spring Boot来构建一个综合性的Web应用程序。我们将一步步地讲解如何创建一个完整的项目，包括数据库连接、用户管理、登录认证等功能。

###依赖和配置首先，我们需要在pom.xml文件中添加必要的依赖：

xml<dependencies>
 <!-- Spring Boot Starter Web -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-web</artifactId>
 </dependency>

 <!-- MySQL Connector -->
 <dependency>
 <groupId>mysql</groupId>
 <artifactId>mysql-connector-java</artifactId>
 <scope>runtime</scope>
 </dependency>

 <!-- Spring Boot Starter Test -->
 <dependency>
 <groupId>org.springframework.boot</groupId>
 <artifactId>spring-boot-starter-test</artifactId>
 <scope>test</scope>
 </dependency>
</dependencies>

properties# application.propertiesspring.datasource.url=jdbc:mysql://localhost:3306/mydbspring.datasource.username=rootspring.datasource.password=123456spring.jpa.hibernate.ddl-auto=update

java// User.java@Entity@Table(name = "users")
public class User {
 @Id @GeneratedValue(strategy = GenerationType.IDENTITY)
 private Long id;

 @Column(nullable = false, length =50)
 private String username;

 @Column(nullable = false, length =100)
 private String password;

 // getters and setters}

java// UserRepository.javapublic interface UserRepository extends JpaRepository {
}

java// SecurityConfig.java@Configuration@EnableWebSecuritypublic class SecurityConfig extends WebSecurityConfigurerAdapter {

 @Autowired private UserDetailsService userDetailsService;

 @Override protected void configure(AuthenticationManagerBuilder auth) throws Exception {
 auth.userDetailsService(userDetailsService).passwordEncoder(passwordEncoder());
 }

 @Bean public PasswordEncoder passwordEncoder() {
 return new BCryptPasswordEncoder();
 }
}

java// LoginController.java@RestController@RequestMapping("/login")
public class LoginController {

 @Autowired private AuthenticationManager authenticationManager;

 @PostMapping public String login(@RequestBody User user) {
 // authenticate user and return token }
}

java// UserController.java@RestController@RequestMapping("/users")
public class UserController {

 @Autowired private UserRepository userRepository;

 @GetMapping public List getAllUsers() {
 return userRepository.findAll();
 }

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