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POConvert graph data to Json
 

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    <p>I'm trying to develop a little program representing link between page on a website. I want to represent each link by a relationship, and each page by a node.</p> <p>For now i'm using a little data set, and it's look like :</p> <pre><code>HOME -&gt; PAGE 1 -&gt; PAGE 3 -&gt; PAGE 5 -&gt; PAGE 2 -&gt; PAGE 4 </code></pre> <p>After inserting all my node and relation I want to traverse my graph and print data in Json to have something like : </p> <pre><code>{ "name": "HOME", "children": [ { "name": "PAGE 1", "children": [ { "name": "PAGE 3", "children": [ {"name": "PAGE 5"} ] }, { "name": "PAGE 2", "children": [ {"name": "PAGE 4"} ] } ] } ] } </code></pre> <p>Is there any function doing this, or I have to write json by my own ?</p> <p>Here is my code : </p> <pre><code>private static void routing( final GraphDatabaseService graphDb ) { Transaction tx = graphDb.beginTx(); Page home, p1, p2, p3, p4, p5; try { home = new Page(graphDb, "http://www.site.com/"); p1 = new Page(graphDb, "http://www.site.com/page1.html"); p2 = new Page(graphDb, "http://www.site.com/page2.html"); p3 = new Page(graphDb, "http://www.site.com/page3.html"); p4 = new Page(graphDb, "http://www.site.com/page4.html"); p5 = new Page(graphDb, "http://www.site.com/page5.html"); home.createLinkTo(p1); home.createLinkTo(p2); p1.createLinkTo(p3); p2.createLinkTo(p4); p3.createLinkTo(p5); tx.success(); tx = graphDb.beginTx(); final TraversalDescription linkTraversal = Traversal.description().depthFirst().relationships( RelationshipTypes.LINK ); String output = ""; for ( Node node : linkTraversal.traverse(home.getUnderlyingNode()).nodes() ) { output += node.getProperty( "url" ) + "\n"; } System.out.println(output); } finally { tx.finish(); } } </code></pre> <p>Code of Page class</p> <pre><code>public class Page implements Serializable{ private static final long serialVersionUID = 1L; static final String URL = "url"; private final Node underlyingNode; private List&lt;Page&gt; children = null; public Page( final Node node ) { this.underlyingNode = node; } public Page( final GraphDatabaseService graphDb, final String url ) { this.underlyingNode = graphDb.createNode(); underlyingNode.setProperty( URL, url ); children = new ArrayList&lt;Page&gt;(); } public Node getUnderlyingNode() { return underlyingNode; } public String getUrl() { return (String) underlyingNode.getProperty( URL ); } public void createLinkTo( final Page other ) { Relationship link = underlyingNode.createRelationshipTo(other.underlyingNode, RelationshipTypes.LINK ); children.add(other); //link.setProperty( ANCHOR, 'Mon ancre' ); } @Override public String toString() { return "Page [url=" + getUrl() + "]"; } </code></pre>
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    1. COI prefer to represent a graph in JSON by simply listing the nodes and edges. Each node has a unique id (could be its internal Neo id), and an edge is simply represented as a start node id and a end node id. Using any of the basic java JSON libraries out there and the `GlobalGraphOperations` class in Neo, you should be able to build up this JSON message with little code.
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