neo4j安装配置入门教程

package neo4j;

import java.io.File;

import java.io.IOException;

import javax.management.relation.Relation;

import org.neo4j.graphdb.GraphDatabaseService;

import org.neo4j.graphdb.Node;

import org.neo4j.graphdb.Relationship;

import org.neo4j.graphdb.RelationshipType;

import org.neo4j.graphdb.Transaction;

import org.neo4j.graphdb.factory.GraphDatabaseFactory;

import org.neo4j.io.fs.FileUtils;

public class test {

  public enum RelTypes implements RelationshipType{

   KNOWS

  }

  private static void registerShutdownHook( final GraphDatabaseService graphDb )

  {

   // Registers a shutdown hook for the Neo4j instance so that it

   // shuts down nicely when the VM exits (even if you "Ctrl-C" the

   // running example before it's completed)

   /*为了确保neo4j数据库的正确关闭，我们可以添加一个关闭钩子方法

    * registerShutdownHook。这个方法的意思就是在jvm中增加一个关闭的

    * 钩子，当jvm关闭的时候，会执行系统中已经设置的所有通过方法

    * addShutdownHook添加的钩子，当系统执行完这些钩子后，jvm才会关闭。

    * 所以这些钩子可以在jvm关闭的时候进行内存清理、对象销毁等操作。*/

   Runtime.getRuntime().addShutdownHook( new Thread()

   {

    @Override

    public void run()

    {

     graphDb.shutdown();

    }

   } );

  }

  public static void main(String[] args) throws IOException {

   FileUtils.deleteRecursively( new File( "db" ) );

   GraphDatabaseService graphdb= new GraphDatabaseFactory().newEmbeddedDatabase( "db" );

   Relationship relationship;

   Transaction tx=graphdb.beginTx();

   try {

    Node node1=graphdb.createNode();

    Node node2=graphdb.createNode();

    node1.setProperty( "message" , "Hello" );

    node2.setProperty( "message" , "World" );

    relationship = node1.createRelationshipTo(node2, RelTypes.KNOWS);

    relationship.setProperty( "message" , "brave neo4j" );

    tx.success();

    System.out.println( "successfully" );

   }

   finally {

    tx.finish();

   }

   registerShutdownHook(graphdb);

  }

}