Quickstart гайд по Spring + Java EE + Persistence, без XML

1. Подготовка к запуску

1.1 IDE

1.2 Структура папок

1.3 Gradle & Git

1.3.1 Для остальных

1.4 База данных

2. Начинаем кодить

2.1 Создание проекта

2.2 Добавляем первый код

2.3 Контент

3. Добавляем работу с БД

3.1 Сущность «User»

3.2 Репозиторий UsersRepository

3.3 Добавление связи между юзером и Spring Security

4. К чему мы пришли

4.1 Для желающих запустить готовый проект

Итак, каркас приложения мы получили.
Теперь добавим в него контроль версий и сборщик.
Для этого в ForHabrahabr добавим .gitignore с вот таким содержанием
.idea
*.iml
build/

Заходим в эту директорию через консоль и пишем

 git init 

Теперь добавим bulid.gradle со всеми зависимостями которые нам пригодятся в процессе написания приложения.

После чего в консольке в той же директории где build.gradle пишем

 gradle wrapper ./gradlew build     (или для windows ./gradlew.bat build)  

package habraspring;  import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.context.annotation.ComponentScan; import org.springframework.data.jpa.repository.config.EnableJpaRepositories;  @SpringBootApplication @ComponentScan @EnableJpaRepositories(basePackages = {"habraspring"}) public class Application {     public static void main(String[] args) {         SpringApplication.run(Application.class, args);     } } 

 #settings for database spring.datasource.url=jdbc:mysql://localhost/forhabrahabr spring.datasource.username=root spring.datasource.password= spring.datasource.driver-class-name=com.mysql.jdbc.Driver #turned on to enable lazy loading spring.jpa.properties.hibernate.enable_lazy_load_no_trans = true 

 15:24:47: Executing external task 'bootRun'... :compileJava UP-TO-DATE :processResources :classes :findMainClass :bootRun    .   ____          _            __ _ _  /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \ ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \  \\/  ___)| |_)| | | | | || (_| |  ) ) ) )   '  |____| .__|_| |_|_| |_\__, | / / / /  =========|_|==============|___/=/_/_/_/  :: Spring Boot ::        (v1.2.5.RELEASE)  2015-07-11 14:24:49.180  INFO 12590 --- [           main] habraspring.Application                  : Starting Application on MacBook-Pro-Maksim.local with PID 12590 (/Users/admin/IdeaProjects/ForHabrahabr/build/classes/main started by admin in /Users/admin/IdeaProjects/ForHabrahabr) 2015-07-11 14:24:49.230  INFO 12590 --- [           main] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@2eda0940: startup date [Sat Jul 11 14:24:49 MSK 2015]; root of context hierarchy 2015-07-11 14:24:50.029  INFO 12590 --- [           main] o.s.b.f.s.DefaultListableBeanFactory     : Overriding bean definition for bean 'beanNameViewResolver': replacing [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/ErrorMvcAutoConfiguration$WhitelabelErrorViewConfiguration.class]] with [Root bean: class [null]; scope=; abstract=false; lazyInit=false; autowireMode=3; dependencyCheck=0; autowireCandidate=true; primary=false; factoryBeanName=org.springframework.boot.autoconfigure.web.WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter; factoryMethodName=beanNameViewResolver; initMethodName=null; destroyMethodName=(inferred); defined in class path resource [org/springframework/boot/autoconfigure/web/WebMvcAutoConfiguration$WebMvcAutoConfigurationAdapter.class]] 2015-07-11 14:24:50.701  INFO 12590 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration' of type [class org.springframework.transaction.annotation.ProxyTransactionManagementConfiguration$$EnhancerBySpringCGLIB$$1f1e9ae] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2015-07-11 14:24:50.727  INFO 12590 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'transactionAttributeSource' of type [class org.springframework.transaction.annotation.AnnotationTransactionAttributeSource] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2015-07-11 14:24:50.741  INFO 12590 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'transactionInterceptor' of type [class org.springframework.transaction.interceptor.TransactionInterceptor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2015-07-11 14:24:50.746  INFO 12590 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.transaction.config.internalTransactionAdvisor' of type [class org.springframework.transaction.interceptor.BeanFactoryTransactionAttributeSourceAdvisor] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying) 2015-07-11 14:24:51.168  INFO 12590 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http) 2015-07-11 14:24:51.408  INFO 12590 --- [           main] o.apache.catalina.core.StandardService   : Starting service Tomcat 2015-07-11 14:24:51.409  INFO 12590 --- [           main] org.apache.catalina.core.StandardEngine  : Starting Servlet Engine: Apache Tomcat/8.0.23 2015-07-11 14:24:51.601  INFO 12590 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext 2015-07-11 14:24:51.601  INFO 12590 --- [ost-startStop-1] o.s.web.context.ContextLoader            : Root WebApplicationContext: initialization completed in 2374 ms 2015-07-11 14:24:52.570  INFO 12590 --- [ost-startStop-1] b.a.s.AuthenticationManagerConfiguration :   Using default security password: bd1659e1-4c49-43a2-9fd6-2ca7d46e9e23  2015-07-11 14:24:52.614  INFO 12590 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain     : Creating filter chain: Ant [pattern='/css/**'], [] 2015-07-11 14:24:52.614  INFO 12590 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain     : Creating filter chain: Ant [pattern='/js/**'], [] 2015-07-11 14:24:52.614  INFO 12590 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain     : Creating filter chain: Ant [pattern='/images/**'], [] 2015-07-11 14:24:52.614  INFO 12590 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain     : Creating filter chain: Ant [pattern='/**/favicon.ico'], [] 2015-07-11 14:24:52.614  INFO 12590 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain     : Creating filter chain: Ant [pattern='/error'], [] 2015-07-11 14:24:52.650  INFO 12590 --- [ost-startStop-1] o.s.s.web.DefaultSecurityFilterChain     : Creating filter chain: OrRequestMatcher [requestMatchers=[Ant [pattern='/**']]], [org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter@5854c7d0, org.springframework.security.web.context.SecurityContextPersistenceFilter@874f491, org.springframework.security.web.header.HeaderWriterFilter@34c74c36, org.springframework.security.web.authentication.logout.LogoutFilter@609329b3, org.springframework.security.web.authentication.www.BasicAuthenticationFilter@a37632c, org.springframework.security.web.savedrequest.RequestCacheAwareFilter@33a36df4, org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter@a3153e3, org.springframework.security.web.authentication.AnonymousAuthenticationFilter@1b8b1dc9, org.springframework.security.web.session.SessionManagementFilter@5ad0989a, org.springframework.security.web.access.ExceptionTranslationFilter@3e313564, org.springframework.security.web.access.intercept.FilterSecurityInterceptor@1fb86c05] 2015-07-11 14:24:52.723  INFO 12590 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'characterEncodingFilter' to: [/*] 2015-07-11 14:24:52.724  INFO 12590 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'hiddenHttpMethodFilter' to: [/*] 2015-07-11 14:24:52.724  INFO 12590 --- [ost-startStop-1] o.s.b.c.embedded.FilterRegistrationBean  : Mapping filter: 'springSecurityFilterChain' to: [/*] 2015-07-11 14:24:52.724  INFO 12590 --- [ost-startStop-1] o.s.b.c.e.ServletRegistrationBean        : Mapping servlet: 'dispatcherServlet' to [/] 2015-07-11 14:24:53.410  INFO 12590 --- [           main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default' 2015-07-11 14:24:53.425  INFO 12590 --- [           main] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [ 	name: default 	...] 2015-07-11 14:24:53.500  INFO 12590 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {4.3.10.Final} 2015-07-11 14:24:53.503  INFO 12590 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found 2015-07-11 14:24:53.505  INFO 12590 --- [           main] org.hibernate.cfg.Environment            : HHH000021: Bytecode provider name : javassist 2015-07-11 14:24:53.628  INFO 12590 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {4.0.5.Final} 2015-07-11 14:24:53.711  INFO 12590 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect 2015-07-11 14:24:53.774  INFO 12590 --- [           main] o.h.h.i.ast.ASTQueryTranslatorFactory    : HHH000397: Using ASTQueryTranslatorFactory 2015-07-11 14:24:54.244  INFO 12590 --- [           main] s.w.s.m.m.a.RequestMappingHandlerAdapter : Looking for @ControllerAdvice: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@2eda0940: startup date [Sat Jul 11 14:24:49 MSK 2015]; root of context hierarchy 2015-07-11 14:24:54.328  INFO 12590 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error]}" onto public org.springframework.http.ResponseEntity<java.util.Map<java.lang.String, java.lang.Object>> org.springframework.boot.autoconfigure.web.BasicErrorController.error(javax.servlet.http.HttpServletRequest) 2015-07-11 14:24:54.328  INFO 12590 --- [           main] s.w.s.m.m.a.RequestMappingHandlerMapping : Mapped "{[/error],produces=[text/html]}" onto public org.springframework.web.servlet.ModelAndView org.springframework.boot.autoconfigure.web.BasicErrorController.errorHtml(javax.servlet.http.HttpServletRequest) 2015-07-11 14:24:54.356  INFO 12590 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/webjars/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2015-07-11 14:24:54.357  INFO 12590 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2015-07-11 14:24:54.393  INFO 12590 --- [           main] o.s.w.s.handler.SimpleUrlHandlerMapping  : Mapped URL path [/**/favicon.ico] onto handler of type [class org.springframework.web.servlet.resource.ResourceHttpRequestHandler] 2015-07-11 14:24:54.723  INFO 12590 --- [           main] o.s.j.e.a.AnnotationMBeanExporter        : Registering beans for JMX exposure on startup 2015-07-11 14:24:54.800  INFO 12590 --- [           main] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat started on port(s): 8080 (http) 2015-07-11 14:24:54.803  INFO 12590 --- [           main] habraspring.Application                  : Started Application in 5.945 seconds (JVM running for 6.529)

package habraspring.config;  import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.ViewControllerRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;  @Configuration public class MvcConfig extends WebMvcConfigurerAdapter {     @Override     public void addViewControllers(ViewControllerRegistry registry) {         registry.addViewController("/home").setViewName("home");         registry.addViewController("/").setViewName("home");     } } 

package habraspring.config;  import org.springframework.boot.autoconfigure.security.SecurityProperties; import org.springframework.context.annotation.Configuration; import org.springframework.core.annotation.Order; import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity; import org.springframework.security.config.annotation.web.builders.HttpSecurity; import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter; import org.springframework.security.config.annotation.web.servlet.configuration.EnableWebMvcSecurity;  @Configuration @EnableWebMvcSecurity @EnableGlobalMethodSecurity(prePostEnabled = true) @Order(SecurityProperties.ACCESS_OVERRIDE_ORDER) public class WebSecurityConfig extends WebSecurityConfigurerAdapter {     @Override     protected void configure(HttpSecurity http) throws Exception {         http                 .authorizeRequests()                 .antMatchers("/", "/home").permitAll();     } } 

<!DOCTYPE html> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:th="http://www.thymeleaf.org" xmlns:sec="http://www.thymeleaf.org/thymeleaf-extras-springsecurity3"> <head>     <title>Habrahabr</title> </head> <body> <h1>Welcome!</h1>  <p>Yours home page.</p> </body> </html> 

package habraspring.entities;  import javax.persistence.*;  @Entity @Table(name="users") public class User {     @Id     @GeneratedValue(strategy = GenerationType.AUTO)     private long id;     private String username;     private String password;          public String getPassword() {         return password;     }      public void setPassword(String password) {         this.password = password;     }      public long getId() {         return id;     }      public void setId(long id) {         this.id = id;     }      public String getUsername() {         return username;     }      public void setUsername(String username) {         this.username = username;     }      protected User(){}     public User(String name, String pass) {         username = name;         password = pass;     }      } 

package habraspring.repositories;  import habraspring.entities.User; import org.springframework.data.repository.CrudRepository;  public interface UsersRepository extends CrudRepository<User, Long> {     User findByUsername(String username); } 

package habraspring.utils;  import habraspring.entities.User; import habraspring.repositories.UsersRepository; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.security.authentication.InternalAuthenticationServiceException; import org.springframework.security.core.GrantedAuthority; import org.springframework.security.core.userdetails.UserDetails; import org.springframework.security.core.userdetails.UserDetailsService; import org.springframework.security.core.userdetails.UsernameNotFoundException; import org.springframework.stereotype.Service;  import java.util.ArrayList; import java.util.Collection; import java.util.List;  @Service public class MySQLUserDetailsService implements UserDetailsService {     @Autowired     UsersRepository users;     @Override     public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {         UserDetails loadedUser;          try {             User client = users.findByUsername(username);             loadedUser = new org.springframework.security.core.userdetails.User(                     client.getUsername(), client.getPassword(),                     DummyAuthority.getAuth());         } catch (Exception repositoryProblem) {             throw new InternalAuthenticationServiceException(repositoryProblem.getMessage(), repositoryProblem);         }         return loadedUser;     }      static class DummyAuthority implements GrantedAuthority     {         static Collection<GrantedAuthority> getAuth()         {             List<GrantedAuthority> res = new ArrayList<>(1);             res.add(new DummyAuthority());             return res;         }         @Override         public String getAuthority() {             return "USER";         }     } } 

package habraspring.config;  import habraspring.utils.MySQLUserDetailsService; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.autoconfigure.security.SecurityProperties; import org.springframework.context.annotation.Configuration; import org.springframework.core.annotation.Order; import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder; import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity; import org.springframework.security.config.annotation.web.builders.HttpSecurity; import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter; import org.springframework.security.config.annotation.web.servlet.configuration.EnableWebMvcSecurity;  @Configuration @EnableWebMvcSecurity @EnableGlobalMethodSecurity(prePostEnabled = true) @Order(SecurityProperties.ACCESS_OVERRIDE_ORDER) public class WebSecurityConfig extends WebSecurityConfigurerAdapter {     @Override     protected void configure(HttpSecurity http) throws Exception {         http                 .authorizeRequests()                 .antMatchers("/", "/home").permitAll()                 .anyRequest().authenticated()                 .and()                 .formLogin()                 .loginPage("/login")                 .permitAll()                 .and()                 .logout()                 .permitAll();     }      @Autowired     private MySQLUserDetailsService mySQLUserDetailsService;      @Autowired     public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {         auth.userDetailsService(mySQLUserDetailsService);     } }