Question

我正在尝试开发一个代表网站页面之间链接的小程序。我希望通过关系表示每个链接，并通过节点表示每个页面。

现在我正在使用一些小数据集，它看起来像：

HOME -> PAGE 1 -> PAGE 3 -> PAGE 5
     -> PAGE 2 -> PAGE 4

在插入我的所有节点和关系之后，我想遍历我的图形并在Json中打印数据，如下所示：

{
  "name": "HOME",
  "children": [
    {
      "name": "PAGE 1",
      "children": [
        {
          "name": "PAGE 3",
          "children": [
            {"name": "PAGE 5"}
          ]
        },
        {
          "name": "PAGE 2",
          "children": [
            {"name": "PAGE 4"}
          ]
        }
      ]
    }
  ]
}

有没有这样做的功能，或者我必须自己编写json？

这是我的代码：

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();
        }
    }

Page class of class class

public class Page implements Serializable{
    private static final long serialVersionUID = 1L;

    static final String URL = "url";
    private final Node underlyingNode;
    private List<Page> 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<Page>();
    }

    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() + "]";
    }

Answer 1

假设你有一个代表你网页的bean，就像这样：

public class Page implements Serializable {
    private String name;
    private List<Page> children;
    private transient GraphDatabaseService dbService;

    // Constructors, Getters/Setters
}

您可以使用各种JSON库（例如Jackson或GSON）轻松地对其进行序列化。这是杰克逊的一个简单例子：

final Page home ; // Initialize and construct the home page
final ObjectMapper mapper = new ObjectMapper();
final String json = mapper.writeValueAsString(home);

Answer 2

我认为最有效的格式类似于节点和边缘列表，有关CSV版本请参阅https://github.com/jexp/batch-import，D3在Javascript中执行类似操作，请参阅使用JSON读取的D3示例。

/彼得

将图形数据转换为Json

2 个答案: