Basic Sling Model Exporter

/*
	Open a page which is having component /apps/project/components/page/page
	/content/project/en/jcr:content.model.json
	Don't miss jcr:content in the path. Add jcr:content.model.json
	*/
	package com.org.project.models;
	import javax.annotation.PostConstruct;
	import javax.inject.Inject;
	import javax.inject.Named;
	import javax.jcr.Node;
	import javax.jcr.RepositoryException;
	import org.apache.sling.api.resource.Resource;
	import org.apache.sling.api.resource.ResourceResolver;
	import org.apache.sling.models.annotations.Exporter;
	import org.apache.sling.models.annotations.Model;
	import org.apache.sling.models.annotations.Required;
	import org.apache.sling.models.annotations.Source;
	import org.apache.sling.models.annotations.injectorspecific.Self;
	import com.day.cq.wcm.api.Page;
	@Model(adaptables = Resource.class, resourceType = "/apps/project/components/page/page")
	@Exporter(name = "jackson", extensions = "json")
	public class PageModelExporter {
	@Self
	private Resource resource;
	@Inject @Named("jcr:title") @Required
	private String title;
	@PostConstruct
	private void init() {
	}
	public String getTitle() {
	return title;
	}
	}

Basic Sling Model Example

/*
	<div data-sly-use.object="com.org.project.models.PageModel"/>
	${object.title}
	</div>
	*/
	package com.org.project.models;
	import org.apache.sling.api.resource.Resource;
	import org.apache.sling.models.annotations.DefaultInjectionStrategy;
	import org.apache.sling.models.annotations.Model;
	import org.apache.sling.models.annotations.Required;
	import org.apache.sling.models.annotations.injectorspecific.Self;
	import javax.annotation.PostConstruct;
	import javax.inject.Inject;
	import javax.inject.Named;
	@Model(
	adaptables = Resource.class,
	defaultInjectionStrategy = DefaultInjectionStrategy.OPTIONAL)
	public class PageModel {
	@Self
	private Resource resource;
	@Inject @Named("jcr:title") @Required
	private String title;
	@PostConstruct
	private void init() {
	}
	public String getTitle() {
	return title;
	}
	}