Classe de configuração do curso Spring MVC 2 da Alura

AppWebConfiguration.java

package br.com.casadocodigo.loja.conf;

import java.util.ArrayList;
import java.util.List;
import java.util.Properties;
import java.util.concurrent.TimeUnit;

import org.springframework.cache.CacheManager;
import org.springframework.cache.annotation.EnableCaching;
import org.springframework.cache.guava.GuavaCacheManager;
import org.springframework.context.MessageSource;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.EnableAspectJAutoProxy;
import org.springframework.context.support.ReloadableResourceBundleMessageSource;
import org.springframework.format.datetime.DateFormatter;
import org.springframework.format.datetime.DateFormatterRegistrar;
import org.springframework.format.support.DefaultFormattingConversionService;
import org.springframework.format.support.FormattingConversionService;
import org.springframework.http.converter.json.MappingJackson2HttpMessageConverter;
import org.springframework.mail.MailSender;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.web.accept.ContentNegotiationManager;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.multipart.MultipartResolver;
import org.springframework.web.multipart.support.StandardServletMultipartResolver;
import org.springframework.web.servlet.LocaleResolver;
import org.springframework.web.servlet.ViewResolver;
import org.springframework.web.servlet.config.annotation.DefaultServletHandlerConfigurer;
import org.springframework.web.servlet.config.annotation.EnableWebMvc;
import org.springframework.web.servlet.config.annotation.InterceptorRegistry;
import org.springframework.web.servlet.config.annotation.WebMvcConfigurerAdapter;
import org.springframework.web.servlet.i18n.CookieLocaleResolver;
import org.springframework.web.servlet.i18n.LocaleChangeInterceptor;
import org.springframework.web.servlet.view.ContentNegotiatingViewResolver;
import org.springframework.web.servlet.view.InternalResourceViewResolver;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.SerializationFeature;
import com.google.common.cache.CacheBuilder;

import br.com.casadocodigo.loja.controllers.HomeController;
import br.com.casadocodigo.loja.dao.ProdutoDAO;
import br.com.casadocodigo.loja.infra.FileSaver;
import br.com.casadocodigo.loja.models.CarrinhoCompras;

@EnableWebMvc
@ComponentScan(basePackageClasses = { HomeController.class, ProdutoDAO.class, FileSaver.class, CarrinhoCompras.class })
@EnableCaching
@EnableAspectJAutoProxy(proxyTargetClass = true) 
public class AppWebConfiguration extends WebMvcConfigurerAdapter {

	@Bean
	public InternalResourceViewResolver internalResourceViewResolver() {
		InternalResourceViewResolver resolver = new InternalResourceViewResolver();
		resolver.setPrefix("/WEB-INF/views/");
		resolver.setSuffix(".jsp");

		// resolver.setExposeContextBeansAsAttributes(true);
		resolver.setExposedContextBeanNames("carrinhoCompras");

		return resolver;
	}

	@Bean
	public MessageSource messageSource() {
		ReloadableResourceBundleMessageSource messageSource = new ReloadableResourceBundleMessageSource();
		messageSource.setBasename("/WEB-INF/messages");
		messageSource.setDefaultEncoding("UTF-8");
		messageSource.setCacheSeconds(1);
		return messageSource;
	}

	@Bean
	public FormattingConversionService mvcConversionService() {
		DefaultFormattingConversionService conversionService = new DefaultFormattingConversionService();
		DateFormatterRegistrar registrar = new DateFormatterRegistrar();
		registrar.setFormatter(new DateFormatter("yyyy-MM-dd"));
		registrar.registerFormatters(conversionService);

		return conversionService;
	}

	@Bean
	public MultipartResolver multipartResolver() {
		return new StandardServletMultipartResolver();
	}

	@Bean
	public RestTemplate restTemplate() {
		return new RestTemplate();
	}

	@Bean
	public CacheManager cacheManger() {
		CacheBuilder<Object, Object> builder = CacheBuilder.newBuilder().maximumSize(100).expireAfterAccess(5,
				TimeUnit.MINUTES);
		GuavaCacheManager manager = new GuavaCacheManager();
		manager.setCacheBuilder(builder);
		return  manager; //new ConcurrentMapCacheManager();
	}
	
	@Bean
	public ViewResolver contentNegotiationViewResolver(ContentNegotiationManager manager) {
		List<ViewResolver> viewResolvers = new ArrayList<>();
		viewResolvers.add(internalResourceViewResolver());
		viewResolvers.add(new JsonViewResolver());
		
		ContentNegotiatingViewResolver resolver = new ContentNegotiatingViewResolver();
		resolver.setViewResolvers(viewResolvers);
		resolver.setContentNegotiationManager(manager);
		return resolver;
	}

	@Override
	public void configureDefaultServletHandling(DefaultServletHandlerConfigurer configurer) {
		configurer.enable();
	}
	
	@Override
	public void addInterceptors(InterceptorRegistry registry) {
		registry.addInterceptor(new LocaleChangeInterceptor());
	}
	
	@Bean
	public LocaleResolver localeResolver(){
	    return new CookieLocaleResolver();
	}
	
	@Bean
	public MailSender mailSender() {
		JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
		mailSender.setHost("seu servidor smtp");//por exemplo smtp.gmail.com
		mailSender.setUsername("seu email");
		mailSender.setPassword("sua senha");
		mailSender.setPort(587);
		
		Properties mailProperties = new Properties();
		mailProperties.setProperty("mail.smtp.auth", "true");
		mailProperties.setProperty("mail.smtp.starttls.enable", "true");
		mailSender.setJavaMailProperties(mailProperties);
		
		return mailSender;
	}	
}