Servlet for fetching data from one node and using that data elsewhere

Question

Say I have multiple pages under /content/practice/articles. Now in /content/practice/articles/firstpage/jcr:content there is a property named myImage. I want to read and fetch that value from myImage property which is a path basically.
 
Now I want to navigate to /content/practice/articles/firstpage/jcr:content/root/container/detailed_page and replace the properties (mainImage & smallImage) value with the data fetched from myImage property.
 
Can someone help me with the servlet code that I need to write in order to fetch the same?
 
Note : There are 500 pages under /content/practice/articles and I would have to do the above for all of them.
 
@nitin_laad had helped me out previously with the following code snippet, but since I'm still a newbie I'm unable to make the code run-worthy. Can someone please help me out with the full code snippet (say enclose the following with appropriate try catch block and other necessary statements). Thanks!
 
sample code 
- @component(service = Servlet.class, property = {
        Constants.SERVICE_DESCRIPTION + "= Sample servlet to copy property value",
        "sling.servlet.methods=" + HttpConstants.METHOD_POST,
        "sling.servlet.paths=" + "/bin/copy-property"
})
public class CopyPropertyServlet extends SlingAllMethodsServlet {
    private static final Logger LOG = LoggerFactory.getLogger(CopyPropertyServlet.class);

@Override
    protected void doPost(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException {
        ResourceResolver resourceResolver = request.getResourceResolver();
        Session session = resourceResolver.adaptTo(Session.class);

// Get the source property value
        Node sourceNode = session.getNode("/content/practice/articles/jcr:content");
        Property sourceProperty = sourceNode.getProperty("myImage");
        String sourcePropertyValue = sourceProperty.getString();

// Get the destination property and set the value
        Node destinationNode = session.getNode("/content/practice/articles/jcr:content/root/container/main_page");
        destinationNode.setProperty("mainImage", sourcePropertyValue);

// Save the changes
        session.save();

response.getWriter().write("Property value copied successfully");
    }
}

Saravanan_Dharmaraj · Accepted Answer

I have updated the same code below to run for all the articles with try catch block , please run it in browser and see. First run it for fewer set of pages before run it for all.

import org.apache.felix.scr.annotations.Component;
import org.apache.felix.scr.annotations.Properties;
import org.apache.felix.scr.annotations.Reference;
import org.apache.felix.scr.annotations.Service;
import org.apache.sling.api.SlingHttpServletRequest;
import org.apache.sling.api.SlingHttpServletResponse;
import org.apache.sling.api.resource.Resource;
import org.apache.sling.api.resource.ResourceResolver;
import org.apache.sling.api.servlets.SlingAllMethodsServlet;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.jcr.Node;
import javax.jcr.Property;
import javax.jcr.RepositoryException;
import javax.jcr.Session;
import javax.servlet.Servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.*;


@Component(metatype = false)
@Service({ Servlet.class })
@Properties({
        @org.apache.felix.scr.annotations.Property(name = "sling.servlet.paths", value = {"/bin/copy-property" }),
        })
public class CopyPropertyServlet extends SlingAllMethodsServlet {
    private static final long serialVersionUID = -29612592807014205L;

    private final Logger log = LoggerFactory.getLogger(CopyPropertyServlet.class);
    private final String PAGE_PATH = "/content/practice/articles";

    public void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws IOException {
        response.setContentType("text/html");
        ResourceResolver resourceResolver = request.getResourceResolver();
        Session session = resourceResolver.adaptTo(Session.class);

        // Get the source property value
        try {
            Resource parentRes = resourceResolver.getResource(PAGE_PATH);
            Iterator<Resource> resourceIterator = parentRes.listChildren();
            while (resourceIterator.hasNext()) {
                Resource articleRes = resourceIterator.next();
                Node sourceNode = session.getNode(articleRes.getPath() + "/jcr:content");
                Property sourceProperty = sourceNode.getProperty("myImage");
                String sourcePropertyValue = sourceProperty.getString();

                // Get the destination property and set the value
                Node destinationNode = session.getNode(articleRes.getPath() + "/jcr:content/root/container/detailed_page");
                destinationNode.setProperty("mainImage", sourcePropertyValue);
                destinationNode.setProperty("smallImage", sourcePropertyValue);

                // Save the changes
                session.save();
            }

        } catch (RepositoryException e) {
            log.error("CopyPropertyServlet : Reading and setting error ");
        }

        response.getWriter().write("Property value copied successfully");
    }

}

arindam6600 · Answer

@arunpatidar @briankasingli @ritesh_mittal @nirmal_jose @lukasz-m @pulkit_jain_ @debal_das @chitramadan Can you please help me out here?

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