java - Spring Boot Maven pom.xml 不存在

Question

我是 java 世界的新手。我的 SpringApplication Runner 类上出现此错误“package org.springframework.boot 不存在”。但是我将 Spring Boot 依赖项添加到了 pom.xml 我不明白为什么会出现此错误。

pom.xml

    <dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-jersey</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-security</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>javax.transaction</groupId>
        <artifactId>javax.transaction-api</artifactId>
        <version>1.2</version>
    </dependency>
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>org.springframework.security</groupId>
        <artifactId>spring-security-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

用户Dao

    @Repository
public class UsersDao {

    @PersistenceContext
    private EntityManager entityManager;

    public void save(Users users){
        entityManager.persist(users);
    }

}

用户DTO

public class UsersDto {

private Integer id;
private String name;
private String surname;
private String username;
private Boolean isSuperUser;
private String email;
private String password;
private Date created_at;
private Date updated_at;


public UsersDto(){

}

public UsersDto(Users users){
    this.id = users.getId();
    this.name = users.getName();
    this.surname = users.getSurname();
    this.email = users.getEmail();
    this.isSuperUser = users.getSuperUser();
    this.username = users.getUsername();
    this.password = users.getPassword();
}//AND GETTER&SETTER

用户资源

    @Component
@Path("/users")
public class UsersResources {
    @Autowired
    UsersService usersService;

    @POST
    @Produces(MediaType.APPLICATION_JSON)
    @Consumes(MediaType.APPLICATION_JSON)
    public Response saveCity(UsersDto usersDto){
        Users users;

        try{
            users = usersService.saveUsers(usersDto);

        }catch (Exception e){
            return Response.status(Response.Status.INTERNAL_SERVER_ERROR).build();
        }
        return Response.ok(users).build();
    }

}

和用户服务

    @Service
public class UsersService {

    @Autowired
    private UsersDao usersDao;

    @Transactional
    public Users saveUsers(UsersDto usersDto){

        Users users = new Users();
        users.setName(usersDto.getName());
        users.setEmail(usersDto.getEmail());
        users.setSuperUser(usersDto.getSuperUser());
        users.setSurname(usersDto.getSurname());
        users.setPassword(usersDto.getPassword());
        usersDao.save(users);

        return users;
    }

}

用户模型

@Entity
@Table(name="users")
public class Users implements Serializable {
    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    @Column(name="id")
    private Integer id;

    @Column(name="name")
    private String name;

    @Column(name="surname")
    private String surname;

    @Column(name="username")
    private String username;

    @Column(name="password")
    private String password;

    @Column(name="is_super_user")
    private Boolean isSuperUser;

    @Column(name="email")
    private String email;


    @Column(name="created_at")
    private Date created_at;

    @Column(name="updated_at")
    private Date updated_at;


    @PrePersist
    protected void onCreate() {
        created_at = new Date();
    }

    @PreUpdate
    protected void onUpdate() {
        updated_at = new Date();
    }

我的错在哪里？我该如何修复它？我想问类似的问题。有时我们会遇到一些错误，但我找不到它。所以我们知道这个错误的原因是 pom.xml 依赖冲突。但是没有maven 上的错误。由于不兼容的依赖关系，我们很累。有没有防止依赖冲突的解决方案？(如 maven 依赖 validator )

Answer 1

要使用 Spring Boot，更简单的方法是使用 Spring Initiliazr https://start.spring.io/ 创建 Spring Boot 项目。 。您可以从这里创建一个 Maven 项目，其中已修补了 Spring Boot 或更多其他依赖项。