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();    }}