java连接Neo4j服务器

一：Neo4j服务器安装(参考：http://docs.neo4j.org.cn/server-installation.html)

1.下载Neo4j数据，我下载的版本是： neo4j-enterprise-1.8.1-windows

2.解压 neo4j-enterprise-1.8.1-windows 

3.到Neo4j的bin目录下neo4j-enterprise-1.8.1-windows\neo4j-enterprise-1.8.1\bin

4.运行 neo4j start 命令

5.打开 http://localhost:7474  看到图形化界面则安装成功！

二：测试代码(参考：http://www.neo4j.org.cn/2012/07/30/server-java-rest-client-example/)

测试代码总共有三个类：

CreateSimpleGraph.java  下载地址：https://github.com/neo4j/community/blob/1.8.M06/server-examples/src/main/java/org/neo4j/examples/server/CreateSimpleGraph.java
Relationship.java  下载地址：https://github.com/neo4j/community/blob/1.8.M06/server-examples/src/main/java/org/neo4j/examples/server/Relationship.java
TraversalDescription.java  下载地址：https://github.com/neo4j/community/blob/1.8.M06/server-examples/src/main/java/org/neo4j/examples/server/TraversalDescription.java

三：程序正常运行用到的jar包

1.neo4j-enterprise-1.8.1-windows\neo4j-enterprise-1.8.1\lib下所有jar包

2.自己下载的jar包

com.sun.jersey.jersey-core-1.4.0.jar

javax.ws.rs.jar

jersey-client-1.9.jar

四：程序代码

package com.wzs.linux;

public class Relationship
{
    public static final String OUT = "out";
    public static final String IN = "in";
    public static final String BOTH = "both";
    private String type;
    private String direction;

    public String toJsonCollection()
    {
        StringBuilder sb = new StringBuilder();
        sb.append("{ ");
        sb.append(" \"type\" : \"" + type + "\"");
        if (direction != null)
        {
            sb.append(", \"direction\" : \"" + direction + "\"");
        }
        sb.append(" }");
        return sb.toString();
    }

    public Relationship(String type, String direction)
    {
        setType(type);
        setDirection(direction);
    }

    public Relationship(String type)
    {
        this(type, null);
    }

    public void setType(String type)
    {
        this.type = type;
    }

    public void setDirection(String direction)
    {
        this.direction = direction;
    }
}

import java.net.URI;
import java.net.URISyntaxException;

import javax.ws.rs.core.MediaType;

import com.sun.jersey.api.client.Client;
import com.sun.jersey.api.client.ClientResponse;
import com.sun.jersey.api.client.WebResource;

public class CreateSimpleGraph
{
    private static final String SERVER_ROOT_URI = "http://localhost:7474/db/data/";

    public static void main( String[] args ) throws URISyntaxException
    {
        checkDatabaseIsRunning();

        // START SNIPPET: nodesAndProps
        URI firstNode = createNode();
        addProperty( firstNode, "name", "Joe Strummer" );
        URI secondNode = createNode();
        addProperty( secondNode, "band", "The Clash" );
        // END SNIPPET: nodesAndProps

        // START SNIPPET: addRel
        URI relationshipUri = addRelationship( firstNode, secondNode, "singer",
                "{ \"from\" : \"1976\", \"until\" : \"1986\" }" );
        // END SNIPPET: addRel

        // START SNIPPET: addMetaToRel
        addMetadataToProperty( relationshipUri, "stars", "5" );
        // END SNIPPET: addMetaToRel

        // START SNIPPET: queryForSingers
        findSingersInBands( firstNode );
        // END SNIPPET: queryForSingers
    }

    private static void findSingersInBands( URI startNode )
            throws URISyntaxException
    {
        // START SNIPPET: traversalDesc
        // TraversalDescription turns into JSON to send to the Server
        TraversalDescription t = new TraversalDescription();
        t.setOrder( TraversalDescription.DEPTH_FIRST );
        t.setUniqueness( TraversalDescription.NODE );
        t.setMaxDepth( 10 );
        t.setReturnFilter( TraversalDescription.ALL );
        t.setRelationships( new Relationship( "singer", Relationship.OUT ) );
        // END SNIPPET: traversalDesc

        // START SNIPPET: traverse
        URI traverserUri = new URI( startNode.toString() + "/traverse/node" );
        WebResource resource = Client.create()
                .resource( traverserUri );
        String jsonTraverserPayload = t.toJson();
        ClientResponse response = resource.accept( MediaType.APPLICATION_JSON )
                .type( MediaType.APPLICATION_JSON )
                .entity( jsonTraverserPayload )
                .post( ClientResponse.class );

        System.out.println( String.format(
                "POST [%s] to [%s], status code [%d], returned data: "
                        + System.getProperty( "line.separator" ) + "%s",
                jsonTraverserPayload, traverserUri, response.getStatus(),
                response.getEntity( String.class ) ) );
        response.close();
        // END SNIPPET: traverse
    }

    // START SNIPPET: insideAddMetaToProp
    private static void addMetadataToProperty( URI relationshipUri,
            String name, String value ) throws URISyntaxException
    {
        URI propertyUri = new URI( relationshipUri.toString() + "/properties" );
        String entity = toJsonNameValuePairCollection( name, value );
        WebResource resource = Client.create()
                .resource( propertyUri );
        ClientResponse response = resource.accept( MediaType.APPLICATION_JSON )
                .type( MediaType.APPLICATION_JSON )
                .entity( entity )
                .put( ClientResponse.class );

        System.out.println( String.format(
                "PUT [%s] to [%s], status code [%d]", entity, propertyUri,
                response.getStatus() ) );
        response.close();
    }

    // END SNIPPET: insideAddMetaToProp

    private static String toJsonNameValuePairCollection( String name,
            String value )
    {
        return String.format( "{ \"%s\" : \"%s\" }", name, value );
    }

    private static URI createNode()
    {
        // START SNIPPET: 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;
        // END SNIPPET: createNode
    }

    // START SNIPPET: insideAddRel
    private static URI addRelationship( URI startNode, URI endNode,
            String relationshipType, String jsonAttributes )
            throws URISyntaxException
    {
        URI fromUri = new URI( startNode.toString() + "/relationships" );
        String relationshipJson = generateJsonRelationship( endNode,
                relationshipType, jsonAttributes );

        WebResource resource = Client.create()
                .resource( fromUri );
        // POST JSON to the relationships URI
        ClientResponse response = resource.accept( MediaType.APPLICATION_JSON )
                .type( MediaType.APPLICATION_JSON )
                .entity( relationshipJson )
                .post( ClientResponse.class );

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

        response.close();
        return location;
    }
    // END SNIPPET: insideAddRel

    private static String generateJsonRelationship( URI endNode,
            String relationshipType, String... jsonAttributes )
    {
        StringBuilder sb = new StringBuilder();
        sb.append( "{ \"to\" : \"" );
        sb.append( endNode.toString() );
        sb.append( "\", " );

        sb.append( "\"type\" : \"" );
        sb.append( relationshipType );
        if ( jsonAttributes == null || jsonAttributes.length < 1 )
        {
            sb.append( "\"" );
        }
        else
        {
            sb.append( "\", \"data\" : " );
            for ( int i = 0; i < jsonAttributes.length; i++ )
            {
                sb.append( jsonAttributes[i] );
                if ( i < jsonAttributes.length - 1 )
                { // Miss off the final comma
                    sb.append( ", " );
                }
            }
        }

        sb.append( " }" );
        return sb.toString();
    }

    private static void addProperty( URI nodeUri, String propertyName,
            String propertyValue )
    {
        // START SNIPPET: addProp
        String propertyUri = nodeUri.toString() + "/properties/" + propertyName;
        // http://localhost:7474/db/data/node/{node_id}/properties/{property_name}

        WebResource resource = Client.create()
                .resource( propertyUri );
        ClientResponse response = resource.accept( MediaType.APPLICATION_JSON )
                .type( MediaType.APPLICATION_JSON )
                .entity( "\"" + propertyValue + "\"" )
                .put( ClientResponse.class );

        System.out.println( String.format( "PUT to [%s], status code [%d]",
                propertyUri, response.getStatus() ) );
        response.close();
        // END SNIPPET: addProp
    }

    private static void checkDatabaseIsRunning()
    {
        // START SNIPPET: checkServer
        WebResource resource = Client.create()
                .resource( SERVER_ROOT_URI );
        ClientResponse response = resource.get( ClientResponse.class );

        System.out.println( String.format( "GET on [%s], status code [%d]",
                SERVER_ROOT_URI, response.getStatus() ) );
        response.close();
        // END SNIPPET: checkServer
    }
}

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class TraversalDescription
{
    public static final String DEPTH_FIRST = "depth first";
    public static final String NODE = "node";
    public static final String ALL = "all";

    private String uniqueness = NODE;
    private int maxDepth = 1;
    private String returnFilter = ALL;
    private String order = DEPTH_FIRST;
    private List<Relationship> relationships = new ArrayList<Relationship>();

    public void setOrder( String order )
    {
        this.order = order;
    }

    public void setUniqueness( String uniqueness )
    {
        this.uniqueness = uniqueness;
    }

    public void setMaxDepth( int maxDepth )
    {
        this.maxDepth = maxDepth;
    }

    public void setReturnFilter( String returnFilter )
    {
        this.returnFilter = returnFilter;
    }

    public void setRelationships( Relationship... relationships )
    {
        this.relationships = Arrays.asList( relationships );
    }

    public String toJson()
    {
        StringBuilder sb = new StringBuilder();
        sb.append( "{ " );
        sb.append( " \"order\" : \"" + order + "\"" );
        sb.append( ", " );
        sb.append( " \"uniqueness\" : \"" + uniqueness + "\"" );
        sb.append( ", " );
        if ( relationships.size() > 0 )
        {
            sb.append( "\"relationships\" : [" );
            for ( int i = 0; i < relationships.size(); i++ )
            {
                sb.append( relationships.get( i )
                        .toJsonCollection() );
                if ( i < relationships.size() - 1 )
                { // Miss off the final comma
                    sb.append( ", " );
                }
            }
            sb.append( "], " );
        }
        sb.append( "\"return filter\" : { " );
        sb.append( "\"language\" : \"builtin\", " );
        sb.append( "\"name\" : \"" );
        sb.append( returnFilter );
        sb.append( "\" }, " );
        sb.append( "\"max depth\" : " );
        sb.append( maxDepth );
        sb.append( " }" );
        return sb.toString();
    }
}