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();
}
}