Простой Spring MVC + Spring Data JPA без XML

В этой статье содержится инструкция по созданию простого web- приложения. Используются технологии:

Java 8
Gradle
Spring MVC 4.1.6 (Java Config)
Spring Data JPA 1.8.1
Hibernate 5
Javax Servlet API 3.1.0 (Java Config)

Итоговая структура проекта:

apply plugin: 'java'
apply plugin: 'war'

repositories {
mavenCentral()
}

dependencies {
testCompile group: 'junit', name: 'junit', version: '4.11'
compile 'org.springframework:spring-context:4.1.6.RELEASE'
compile 'org.springframework:spring-webmvc:4.1.6.RELEASE'
compile 'org.springframework.data:spring-data-jpa:1.8.1.RELEASE'
compile 'mysql:mysql-connector-java:5.1.36'
compile 'org.hibernate:hibernate-core:5.0.0.CR1'
compile 'org.hibernate:hibernate-entitymanager:5.0.0.CR1'
compile 'com.google.guava:guava:18.0'
compile 'javax.servlet:javax.servlet-api:3.1.0'
compile 'javax.servlet:jstl:1.2'
}

apply plugin: 'java'

apply plugin: 'war'

repositories {

mavenCentral()

}

dependencies {

testCompile group: 'junit', name: 'junit', version: '4.11'

compile 'org.springframework:spring-context:4.1.6.RELEASE'

compile 'org.springframework:spring-webmvc:4.1.6.RELEASE'

compile 'org.springframework.data:spring-data-jpa:1.8.1.RELEASE'

compile 'mysql:mysql-connector-java:5.1.36'

compile 'org.hibernate:hibernate-core:5.0.0.CR1'

compile 'org.hibernate:hibernate-entitymanager:5.0.0.CR1'

compile 'com.google.guava:guava:18.0'

compile 'javax.servlet:javax.servlet-api:3.1.0'

compile 'javax.servlet:jstl:1.2'

}

Начинаем с конфигурации развертывания веб-приложения. Это должен был быть web.xml, но servlet-api начиная с версии 3 поддерживает Java Config (Е):

public class WebInitializer implements WebApplicationInitializer {

public void onStartup(ServletContext servletContext) throws ServletException {
AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();
ctx.register(Config.class);
ctx.setServletContext(servletContext);
Dynamic servlet = servletContext.addServlet("dispatcher", new DispatcherServlet(ctx));
servlet.addMapping("/");
servlet.setLoadOnStartup(1);
}
}

public class WebInitializer implements WebApplicationInitializer {

public void onStartup(ServletContext servletContext) throws ServletException {

AnnotationConfigWebApplicationContext ctx = new AnnotationConfigWebApplicationContext();

ctx.register(Config.class);

ctx.setServletContext(servletContext);

Dynamic servlet = servletContext.addServlet("dispatcher", new DispatcherServlet(ctx));

servlet.addMapping("/");

servlet.setLoadOnStartup(1);

}

где в ctx.register мы указываем на наш Spring MVC Java Config (левые конфиги сюда писать не нужно, только MVC):

@Configuration
@ComponentScan
@EnableWebMvc
@EnableJpaRepositories
@Import({DBConfig.class})
public class Config extends WebMvcConfigurerAdapter {

@Bean
public UrlBasedViewResolver setupViewResolver() {
UrlBasedViewResolver resolver = new UrlBasedViewResolver();
resolver.setPrefix("/WEB-INF/jsp/");
resolver.setSuffix(".jsp");
resolver.setViewClass(InternalResourceView.class);
return resolver;
}

@Override
public void addResourceHandlers(ResourceHandlerRegistry registry) {
registry.addResourceHandler("/resources/**").addResourceLocations("/WEB-INF/resources/*");
}
}

@Configuration

@ComponentScan

@EnableWebMvc

@EnableJpaRepositories

@Import({DBConfig.class})

public class Config extends WebMvcConfigurerAdapter {

@Bean

public UrlBasedViewResolver setupViewResolver() {

UrlBasedViewResolver resolver = new UrlBasedViewResolver();

resolver.setPrefix("/WEB-INF/jsp/");

resolver.setSuffix(".jsp");

resolver.setViewClass(InternalResourceView.class);

return resolver;

}

@Override

public void addResourceHandlers(ResourceHandlerRegistry registry) {

registry.addResourceHandler("/resources/**").addResourceLocations("/WEB-INF/resources/*");

}

Импортируем в этот конфиг другие через аннотацию @Import.

Указываем в setupViewResolver корневую папку с нашими страницами и указываем префиксы файлов страниц (например, jsp).

Указываем в addResourceHandlers пути до наших ресурсов(картинки, js, css).

Конфигурация dataSource и SpringData JPA:

@Configuration
@EnableJpaRepositories
public class DBConfig {
@Bean
DriverManagerDataSource dataSource() {
DriverManagerDataSource dataSource = new DriverManagerDataSource();
dataSource.setDriverClassName("com.mysql.jdbc.Driver");
dataSource.setUrl("jdbc:mysql://localhost:3306/springmvc");
dataSource.setUsername("root");
dataSource.setPassword("admin");
return dataSource;
}

@Bean
LocalContainerEntityManagerFactoryBean entityManagerFactory() {
LocalContainerEntityManagerFactoryBean emFactory = new LocalContainerEntityManagerFactoryBean();
emFactory.setDataSource(dataSource());
emFactory.setPersistenceProviderClass(HibernatePersistenceProvider.class);
emFactory.setJpaVendorAdapter(new HibernateJpaVendorAdapter());
Properties properties = new Properties();
properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");
emFactory.setJpaProperties(properties);
emFactory.setPackagesToScan("ru.vympel.repositories", "ru.vympel.dom");
return emFactory;
}

@Bean
JpaTransactionManager transactionManager() {
JpaTransactionManager transactionManager = new JpaTransactionManager();
transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());
return transactionManager;
}
}

@Configuration

@EnableJpaRepositories

public class DBConfig {

@Bean

DriverManagerDataSource dataSource() {

DriverManagerDataSource dataSource = new DriverManagerDataSource();

dataSource.setDriverClassName("com.mysql.jdbc.Driver");

dataSource.setUrl("jdbc:mysql://localhost:3306/springmvc");

dataSource.setUsername("root");

dataSource.setPassword("admin");

return dataSource;

}

@Bean

LocalContainerEntityManagerFactoryBean entityManagerFactory() {

LocalContainerEntityManagerFactoryBean emFactory = new LocalContainerEntityManagerFactoryBean();

emFactory.setDataSource(dataSource());

emFactory.setPersistenceProviderClass(HibernatePersistenceProvider.class);

emFactory.setJpaVendorAdapter(new HibernateJpaVendorAdapter());

Properties properties = new Properties();

properties.setProperty("hibernate.dialect", "org.hibernate.dialect.MySQLDialect");

emFactory.setJpaProperties(properties);

emFactory.setPackagesToScan("ru.vympel.repositories", "ru.vympel.dom");

return emFactory;

}

@Bean

JpaTransactionManager transactionManager() {

JpaTransactionManager transactionManager = new JpaTransactionManager();

transactionManager.setEntityManagerFactory(entityManagerFactory().getObject());

return transactionManager;

}

Создаем простой контроллер для начальной страницы с тестом Spring Data JPA (выведет на страницу все записи из таблицы БД):

@Controller
public class DefaultController {

@Autowired
ApplicationContext context;

@RequestMapping(value = "/", method = RequestMethod.GET)
public String index(ModelMap map) {
ContactService bean = context.getBean(ContactService.class);
StringBuilder sb = new StringBuilder("
");
bean.findAll().forEach(it-&gt;sb.append(it.toString()).append("
"));
map.put("msg", sb.toString());
return "index";
}
}

@Controller

public class DefaultController {

@Autowired

ApplicationContext context;

@RequestMapping(value = "/", method = RequestMethod.GET)

public String index(ModelMap map) {

ContactService bean = context.getBean(ContactService.class);

StringBuilder sb = new StringBuilder("

");

bean.findAll().forEach(it->sb.append(it.toString()).append("

"));

map.put("msg", sb.toString());

return "index";

}

Объект предметной области (DOM):

@Entity(name = "contact")
public class Contact {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "ID")
private Long id;

@Column(name = "VERSION")
private int version;

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

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

@Override
public String toString() {
return "Contact{" +
"id=" + id +
", version=" + version +
", firstName='" + firstName + '\'' +
", lastName='" + lastName + '\'' +
'}';
}
}

@Entity(name = "contact")

public class Contact {

@Id

@GeneratedValue(strategy = GenerationType.AUTO)

@Column(name = "ID")

private Long id;

@Column(name = "VERSION")

private int version;

@Column(name = "FIRST_NAME")

private String firstName;

@Column(name = "LAST_NAME")

private String lastName;

@Override

public String toString() {

return "Contact{" +

"id=" + id +

", version=" + version +

", firstName='" + firstName + '\'' +

", lastName='" + lastName + '\'' +

'}';

}

Репозиторий контактов:

public interface ContactRepository extends CrudRepository<contact,integer>{
List<contact> findByFirstName(String firstName);
}

public interface ContactRepository extends CrudRepository<contact,integer>{

List<contact> findByFirstName(String firstName);

}

Сервис контактов:

public interface ContactService {
List<contact> findAll();
List<contact> findByFirstName(String firstName);
Contact findById(Integer id);
Contact save(Contact contact);
void delete(Contact contact);
}

public interface ContactService {

List<contact> findAll();

List<contact> findByFirstName(String firstName);

Contact findById(Integer id);

Contact save(Contact contact);

void delete(Contact contact);

}

@Service("contactService")
@Repository
@Transactional
@Lazy
public class ContactServiceImpl implements ContactService {

@Autowired
ContactRepository contactRepository;

public List<contact> findAll() {
return Lists.newArrayList(contactRepository.findAll());
}</contact>

public List<contact> findByFirstName(String firstName) {
return contactRepository.findByFirstName(firstName);
}</contact>

public Contact findById(Integer id) {
return contactRepository.findOne(id);
}

public Contact save(Contact contact) {
return contactRepository.save(contact);
}

public void delete(Contact contact) {
contactRepository.delete(contact);
}
}

@Service("contactService")

@Repository

@Transactional

@Lazy

public class ContactServiceImpl implements ContactService {

@Autowired

ContactRepository contactRepository;

public List<contact> findAll() {

return Lists.newArrayList(contactRepository.findAll());

}</contact>

public List<contact> findByFirstName(String firstName) {

return contactRepository.findByFirstName(firstName);

}</contact>

public Contact findById(Integer id) {

return contactRepository.findOne(id);

}

public Contact save(Contact contact) {

return contactRepository.save(contact);

}

public void delete(Contact contact) {

contactRepository.delete(contact);

}

JSP-страница index:

&lt;%@page contentType="text/html" pageEncoding="UTF-8"%&gt;
&lt;%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %&gt;
<c:set var="cp" value="${pageContext.request.servletContext.contextPath}" scope="request"></c:set>



<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Spring 4 Web MVC via Annotations</title>
   	<link rel="stylesheet" type="text/css" href="{cp}/resources/css/site.css">
  <script src="${cp}/resources/js/js.js"></script>
<h4>Spring 4 Web MVC via Annotations</h4>
Spring says: <span class="blue">${msg}</span>

<%@page contentType="text/html" pageEncoding="UTF-8"%>

<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>

<c:set var="cp" value="${pageContext.request.servletContext.contextPath}" scope="request"></c:set>

<title>Spring 4 Web MVC via Annotations</title>

<h4>Spring 4 Web MVC via Annotations</h4>

Spring says: <span class="blue">${msg}</span>

Компилируем WAR и запускаем наше простое web-приложение на Tomcat 7:

Простой Spring MVC + Spring Data JPA без XML

Java Inside

Простой Spring MVC + Spring Data JPA без XML

Добавить комментарий Отменить ответ