关于java：将图形数据转换为Json

Convert graph data to Json

我正在尝试开发一个小程序来表示网站页面之间的链接。我想用关系表示每个链接，用节点表示每个页面。

目前我使用的是一个小数据集，它看起来像：

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

在插入了所有节点和关系之后，我希望遍历我的图并在JSON中打印数据，以获得如下内容：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22

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

号

是否有任何函数执行此操作，或者我必须自己编写JSON？

这是我的代码：

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42

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" ) +"
";

}

System.out.println(output);
}
finally
{
tx.finish();
}
}

页面类代码

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41

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() +"]";
}

。