MVC中带Spring的正确结构

Question

我对正确的mvc模式有点困惑。

这是我的配置文件：在这个类中，我有所有的Beans。

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = " name.web.controller")
@PropertySource("classpath:NewLibrary.properties")
@EnableTransactionManagement

    @Bean
    public UserRepo getUserService() {
        return new UserImpl(getDataSource());
    }
    
    
    @Bean
    public BookRepo getBookService() {
        return new BookImpl(getDataSource());
    }

这是我的接口UserRepo和接口UserService。它们是一样的

public interface UserService {
public String getUser();
void add(UserModel u);
UserModel getById(int id);
UserModel getByName(String name);
UserModel getByCognome(String surname);
Optional<UserModel> findOne(int id);
public void insert(User u);
public String giveName();
List<UserModel>ByNome(String nome);
List<UserModel> ByPassAndUsername(String password, String username);

}

我的类实现了这个接口

@Repository
public class UserImpl extends AbstractDao<UserModel, Integer> implements UserRepo {
@PersistenceContext
private EntityManager em;
 @Autowired
public UserRepo userRepo;

private JdbcTemplate conn;
@Override
@Transactional
public void add(UserModel u) {
    em.persist(u);
}
public UserImpl(DataSource ds) {
    conn= new JdbcTemplate(ds);
}
@Override
public UserModel getById(int id) {
    return em.find(UserModel.class, id);
}
@Override
public UserModel getByName(String nome) {
    CriteriaBuilder queryBuilder= em.getCriteriaBuilder();
    CriteriaQuery<UserModel> query= 
queryBuilder.createQuery(UserModel.class);
    Root<UserModel> rec= query.from(UseriModel.class);
     
query.select(rec).where(queryBuilder.equal(rec.get("nome"), nome));
     
     UserModel ut=em.createQuery(query).getSingleResult();
     em.clear();
    
     return ut;
    
    //return em.find(UtentiModel.class, nome);
    
};

最后，我在控制器I@Autowired UsersRepo/中安装了控制器，这是一个接口/。我的代码可以运行，我可以做所有的CRUD操作。

但是，有人告诉我，这不是正确的方式。我不能直接自动连线@在控制器类内部自动连接UserRepo。所以我在网上搜索信息，然后创建一个服务类。它提供的服务是这样的：具有与我在UserRepo interface中编写的方法相同的接口。在我创建了实现该接口的类UserSeviceImpl之后。

在userServiceImpl中，我转到@Autowire UserRepo界面，然后转到控制器中的@Autowire userService。

但是现在我的代码不起作用了，我在所有控件的所有页面中都得到了404状态：`请求的资源[/bookProject/]不可用

说明源服务器找不到目标资源的当前表示形式，或者不愿意透露存在该表示形式`

控制台中没有错误，只有信息：

INFO: Command line argument: -Dfile.encoding=UTF-8
set 30, 2021 5:41:10 PM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFO: The Apache Tomcat Native library which allows using OpenSSL was not found on the java.library.path: [/usr/java/packages/lib:/usr/lib64:/lib64:/lib:/usr/lib]
set 30, 2021 5:41:10 PM org.apache.coyote.AbstractProtocol init
INFO: Initializing ProtocolHandler ["http-nio-8080"]
set 30, 2021 5:41:10 PM org.apache.catalina.startup.Catalina load
INFO: Server initialization in [624] milliseconds
set 30, 2021 5:41:10 PM org.apache.catalina.core.StandardService startInternal
INFO: Starting service [Catalina]
set 30, 2021 5:41:10 PM org.apache.catalina.core.StandardEngine startInternal
INFO: Starting Servlet engine: [Apache Tomcat/9.0.50]
set 30, 2021 5:41:12 PM org.apache.jasper.servlet.TldScanner scanJars
INFO: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
set 30, 2021 5:41:12 PM org.apache.catalina.core.ApplicationContext log
INFO: No Spring WebApplicationInitializer types detected on classpath
set 30, 2021 5:41:12 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory [/home/viktoriya/Scrivania/apache-tomcat-9.0.50/webapps/ROOT]
 set 30, 2021 5:41:12 PM org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deployment of web application directory [/home/viktoriya/Scrivania/apache-tomcat-9.0.50/webapps/ROOT] has finished in [13] ms
set 30, 2021 5:41:12 PM org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-nio-8080"]
set 30, 2021 5:41:12 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in [2050] milliseconds

因此，我无法理解是否自动连接某些bean是错误的，或者我当前的模式是错误的，或者我是否需要更改配置类中的某些内容，或者我是否没有很好地应用服务类。因为在我的代码运行良好之前。

这是我的控制器：@Controller公共类UserController{@自动配电的私人用户服务我们；列表用户；@GetMap（"/new"）公共模型和视图新（模型）{

UserModel users= new UserModel();
model.addAttribute("utenteForm", user);
return new ModelAndView("client", "utenteForm", new 
UtentiModel());
}
@PostMapping("/add")
public ModelAndView sumbit(@ModelAttribute("utenteForm") UserModel users)
{ us.ad(users);

这是UserServiceImpl：

@Service
public class UserServiceImpl implements UserService{
private final static Logger log= 
Logger.getLogger(UserServiceImpl.class.getName());
@Autowired
private UserRepo userRepo;
@PersistenceContext
private EntityManager em;
@Override
public void add(UserModel u) {
    userRepo.add(u);
}
@Override
public UserModel getByName(String name) {
    
    return userRepo.getByName(name);
}

Answer 1

我会说，根据控制器定义检查您调用的路径。我认为如果你更新代码来查看控制器会有所帮助。

例：

@RestController
@RequestMapping("/test")
public class TestRestController{

  @Autowired
  private TestService testService;
 .....
}

 @Service
public class TestServiceImpl implements TestService {

  @Autowired    
  private TestRepository testRepository;

}
@Repository
@Transactional
 public class TestRepositoryImpl implements TestRepository{
 
 }