relexample.java

 // Deal with relationships
Map<Relationship, List<Contentlet>> cRels = new HashMap<Relationship, List<Contentlet>>();
if(rels.size() > 0) {
        for(Relationship rel : rels) {
                String relName = rel.getParentRelationName()+"-"+rel.getChildRelationName();
                String relQuery = "+structureName:"+rel.getParentStructure().getVelocityVarName()+
                                " +"+relName+":"+oldIdentifier+" +live:true +deleted:false";
                String relurl = OLDHOST+"/JSONContent/?type=json&limit=1000&offset=0&q=";
                
                Logger.debug(this, "the query is: "+relQuery);
                
                try {
                        relurl = relurl + URLEncoder.encode(relQuery, "UTF-8");
                } catch (Exception e) {
                        failed.put(stVarName, "Unable to encode the url to fetch the relationships: "+e.getMessage());
                        throw new Exception(e);
                }
                
                Logger.debug(this, "The relurl is "+relurl);
                
                HttpGet relmethod = new HttpGet(relurl);
                
                HttpResponse relresponse;
                try {
                        relresponse = client.execute(relmethod);
                } catch (Exception e) {
                        failed.put(stVarName, "Unable to fetch the relationships data from ("+relName+") from ("+relurl+"): "+e.getMessage());
                        throw new Exception(e);
                }
                
                InputStream relinStream = relresponse.getEntity().getContent();
                StringWriter relwriter = new StringWriter();
                IOUtils.copy(relinStream, relwriter, "UTF-8");
                String reldataString = relwriter.toString();
                                                        
                JSONObject relData;
                JSONArray relCons;
                try {
                        relData = new JSONObject(reldataString);
                        relCons = relData.getJSONArray("contentlets");
                } catch (Exception e) {
                        failed.put(stVarName, "Unable to get the relationships for ("+relName+") from the json: "+e.getMessage());
                        throw new Exception(e);
                }
                
                Logger.debug(this, "The Related Cons: "+relCons.toString(2));
                
                ArrayList<Contentlet> parents = new ArrayList<Contentlet>();
                for(int j=0; j<relCons.length(); j++) {
                        try {
                                JSONObject relCon = relCons.getJSONObject(j);
                                String parentId = identifierMap.get(relCon.getString("identifier"));
                                Contentlet parentCon = conAPI.findContentletByIdentifier(parentId, true, languageId, userAPI.getSystemUser(), false);
                                parents.add(parentCon);
                        } catch (Exception e) {
                                failed.put(stVarName, "Unable to get a parent for the relationship ("+relName+") from the json ("+j+"): "+e.getMessage());
                                throw new Exception(e);
                        }
                }
                cRels.put(rel, parents);
        }
}

// later on
contentlet = conAPI.checkin(contentlet, cRels, cats, new ArrayList<Permission>(), userAPI.getSystemUser(), false);