How to Manipulate List to String and print in seperate row

I am trying to export the 4 columns with the below code.the last column organization is a List.

        String appname = "abc";
        String path = "//home/exportfile//";
        String filename = path+"ApplicationExport-"+appname+".txt";
        String ret = "false";

QueryOptions ops = new QueryOptions();
Filter [] filters = new Filter[1];
filters[0] = Filter.eq("application.name", appname);
ops.add(filters);

List props = new ArrayList();
props.add("identity.name");

//Do search
Iterator it = context.search(Link.class, ops, props);

//Build file and export header row
BufferedWriter out = new BufferedWriter(new FileWriter(filename));
out.write("IdentityName,UserName,WorkforceID,Organization");
out.newLine();          

//Iterate Search Results
if (it!=null)
{                               
        while ( it.hasNext() ) {

                //Get link and create object
                Object [] record = it.next();
                String identityName = (String) record[0];
                Identity user = (Identity) context.getObject(Identity.class, identityName);

                //Get Identity attributes for export
                String workforceid = (String) user.getAttribute("workforceID");                 

                //Get application attributes for export
                String userid="";

                List links = user.getLinks();
                if (links!=null)
                {
                        Iterator lit = links.iterator();
                        while (lit.hasNext())
                        {
                                Link l = lit.next();
                                String lname = l.getApplicationName();
                                if (lname.equalsIgnoreCase(appname))
                                {
                                          userid = (String) l.getAttribute("User Name");
                                          List organizations = l.getAttribute("Organization");

                                          StringBuilder sb = new StringBuilder();
                                          String listItemsSeparator = ","; 

                                                                                        for (Object organization : organizations)
                                                                                                                {
                                                                                                                        sb.append(organization.toString());
                                                                                                                        sb.append(listItemsSeparator);
                                                                                                                }

                                                                                                                org = sb.toString().trim();

                                }
                        }
                }                   

                //Output file
                out.write(identityName+","+userid+","+workforceid+","+org);                             
                out.newLine();                                                                          
                out.flush();
        }

                 ret="true";
}

//Close file and return
out.close();
return ret;

the output of the above code will be.for ex:

IdentityName,UserName,WorkforceID,Organization

dthomas,dthomas001,12345,Finance,HR

How do i get the output in below fashion

IdentityName,UserName,WorkforceID,Organization

dthomas,dthomas001,12345,Finance

dthomas,dthomas001,12345,HR

what and where i need to change the code?