Neo4j手册中的Jersey客户示例

Question

I want to use the Jersey client to connect via REST with a Neo4j database. In the Neo4j manual they have examples of this in Tutorials->Languages->How to use the REST API from Java. I want to create a new node and then use Cypher to add relationships to it. In the Neo4j example ( https://github.com/neo4j/neo4j/blob/2.2.9/community/server-examples/src/main/java/org/neo4j/examples/server/CreateSimpleGraph.java ) they use 'createNode', but the documentation suggests that that is only available using an embedded Neo4j server.

Does calling createNode() work in a RESTful context?

Answer 1

In the example that you reference, the createNode function as defined here is simply making an HTTP POST request to http://localhost:7474/db/data/node which will create a new node:

private static URI createNode()
{
    final String nodeEntryPointUri = SERVER_ROOT_URI + "node";
    // http://localhost:7474/db/data/node

    WebResource resource = Client.create()
            .resource( nodeEntryPointUri );
    // POST {} to the node entry point URI
    ClientResponse response = resource.accept( MediaType.APPLICATION_JSON )
            .type( MediaType.APPLICATION_JSON )
            .entity( "{}" )
            .post( ClientResponse.class );

    final URI location = response.getLocation();
    System.out.println( String.format(
            "POST to [%s], status code [%d], location header [%s]",
            nodeEntryPointUri, response.getStatus(), location.toString() ) );
    response.close();

    return location;
}

This function is defined in the sample code and is completely different than the createNode function that is part of the embedded Java API .

If you are interested in working with the new Neo4j 3.0 version (currently RC) there is a new Java driver that supports Cypher here .