package com.devcheats.demo.spring.config;

public class AppInitializer extends AbstractAnnotationConfigDispatcherServletInitializer {

   @Override
   protected Class<?>[] getRootConfigClasses() {
      return new Class[] { HibernateConfig.class };
   }

   @Override
   protected Class<?>[] getServletConfigClasses() {
      return new Class[] { WebMvcConfig.class };
   }

   @Override
   protected String[] getServletMappings() {
      return new String[] { "/" };
   }
}

package com.devcheats.demo.spring.config;

@Configuration
@EnableWebMvc
@ComponentScan(basePackages = { "com.devcheats.demo.spring"})
public class WebMvcConfig implements WebMvcConfigurer {

   @Bean
   public InternalResourceViewResolver resolver() {
      InternalResourceViewResolver resolver = new InternalResourceViewResolver();
      resolver.setViewClass(JstlView.class);
      resolver.setPrefix("/WEB-INF/views/");
      resolver.setSuffix(".jsp");
      return resolver;
   }

   @Bean
   public MessageSource messageSource() {
      ResourceBundleMessageSource source = new ResourceBundleMessageSource();
      source.setBasename("messages");
      return source;
   }

   @Override
   public Validator getValidator() {
      LocalValidatorFactoryBean validator = new LocalValidatorFactoryBean();
      validator.setValidationMessageSource(messageSource());
      return validator;
   }
}

package com.devcheats.demo.spring.config;

@Configuration
@EnableTransactionManagement
@ComponentScans(value = { @ComponentScan("com.devcheats.demo.spring")})
public class HibernateConfig {

	@Autowired
	private ApplicationContext context;

	@Bean
	public LocalSessionFactoryBean getSessionFactory() {
		LocalSessionFactoryBean factoryBean = new LocalSessionFactoryBean();
		factoryBean.setConfigLocation(context.getResource("classpath:hibernate.cfg.xml"));
		factoryBean.setAnnotatedClasses(User.class);
		return factoryBean;
	}

	@Bean
	public HibernateTransactionManager getTransactionManager() {
		HibernateTransactionManager transactionManager = new HibernateTransactionManager();
		transactionManager.setSessionFactory(getSessionFactory().getObject());
		return transactionManager;
	}

}

package com.devcheats.demo.spring.controller;

@Controller
public class UserController {

	@Autowired
	private UserService userService;

	@GetMapping("/")
	public String userForm(Locale locale, Model model) {
		model.addAttribute("users", userService.list());
		return "editUsers";
	}

	@ModelAttribute("user")
  public User formBackingObject() {
      return new User();
  }

	@PostMapping("/addUser")
	public String saveUser(@ModelAttribute("user") @Valid User user, BindingResult result, Model model) {

		if (result.hasErrors()) {
			model.addAttribute("users", userService.list());
			return "editUsers";
		}

		userService.save(user);
		return "redirect:/";
	}
}

public interface UserService {
   void save(User user);

   List<User> list();
}

@Service
public class UserServiceImpl implements UserService {

   @Autowired
   private UserDao userDao;

   @Transactional
   public void save(User user) {
      userDao.save(user);
   }

   @Transactional(readOnly = true)
   public List<User> list() {
      return userDao.list();
   }
}
UserDao 和 UserDaoImpl
public interface UserDao {
   void save(User user);
   List<User> list();
}

@Repository
public class UserDaoImpl implements UserDao {

   @Autowired
   private SessionFactory sessionFactory;

   @Override
   public void save(User user) {
      sessionFactory.getCurrentSession().save(user);
   }

   @Override
   public List<User> list() {
      @SuppressWarnings("unchecked")
      TypedQuery<User> query = sessionFactory.getCurrentSession().createQuery("from User");
      return query.getResultList();
   }
}

package com.devcheats.demo.spring.model;

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

   @Id
   @GeneratedValue
   @Column(name = "USER_ID")
   private Long id;

   @Column(name = "USER_NAME")
   @Size(max = 20, min = 3, message = "{user.name.invalid}")
   @NotEmpty(message="Please Enter your name")
   private String name;

   @Column(name = "USER_EMAIL", unique = true)
   @Email(message = "{user.email.invalid}")
   @NotEmpty(message="Please Enter your email")
   private String email;

   public Long getId() {
      return id;
   }

   public void setId(Long id) {
      this.id = id;
   }

   public String getName() {
      return name;
   }

   public void setName(String name) {
      this.name = name;
   }

   public String getEmail() {
      return email;
   }

   public void setEmail(String email) {
      this.email = email;
   }
}

package hello;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;

@Entity // This tells Hibernate to make a table out of this class
public class User {
    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private Integer id;

    private String name;

    private String email;

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getEmail() {
		return email;
	}

	public void setEmail(String email) {
		this.email = email;
	}


}

package hello;

import org.springframework.data.repository.CrudRepository;

import hello.User;

// This will be AUTO IMPLEMENTED by Spring into a Bean called userRepository
// CRUD refers Create, Read, Update, Delete

public interface UserRepository extends CrudRepository<User, Long> {

}

package hello;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;

import hello.User;
import hello.UserRepository;

@Controller
@RequestMapping(path="/demo") 
public class MainController {
	@Autowired 
	private UserRepository userRepository;

	@GetMapping(path="/add") // Map ONLY GET Requests
	public @ResponseBody String addNewUser (@RequestParam String name
			, @RequestParam String email) {
		// @ResponseBody means the returned String is the response, not a view name
		// @RequestParam means it is a parameter from the GET or POST request

		User n = new User();
		n.setName(name);
		n.setEmail(email);
		userRepository.save(n);
		return "Saved";
	}

	@GetMapping(path="/all")
	public @ResponseBody Iterable<User> getAllUsers() {
		// This returns a JSON or XML with the users
		return userRepository.findAll();
	}
}

//Create view model to validate te form input for web browser

import javax.validation.constraints.Min;
import javax.validation.constraints.NotNull;
import javax.validation.constraints.Size;

public class PersonForm {

    @NotNull
    @Size(min=2, max=30)
    private String name;

    @NotNull
    @Min(18)
    private Integer age;

    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Integer getAge() {
        return age;
    }

    public void setAge(Integer age) {
        this.age = age;
    }

    public String toString() {
        return "Person(Name: " + this.name + ", Age: " + this.age + ")";
    }
}

    @Override
    public void addViewControllers(ViewControllerRegistry registry) {
        registry.addViewController("/results").setViewName("results");
    }

    @GetMapping("/")
    public String showForm(PersonForm personForm) {
        return "form";//returns the form template.
    }

    @PostMapping("/")
    public String checkPersonInfo(@Valid PersonForm personForm, BindingResult bindingResult) {
		//with @Valid to gather the attributes filled out in the form you’re about to build. you can test for and retrive validation error using BindingResult
        if (bindingResult.hasErrors()) {
            return "form";
        }

        return "redirect:/results";//return redirect action to results template.
    }