系統環境：

Ubuntu 04.10 x64

一：安裝

下載最新版：neo4j-community-2.2.3-unix.tar.gz 解壓

cd neo4j-community-2.2.3/bin

./neo4j start

啟動之後。默認的webport是：7474

三：JAVA操作neo4j

以下樣例演示了一個銀行層級關系的樣例

央行以下有四大行，四大行以下有各自的分行。各自的分行又有各自的支行

package com.lala.neo4j;

import org.neo4j.graphdb.Label;

public class BankLabel implements Label
{
	private String name;
	
	public BankLabel(String name)
	{
		this.name = name;
	}
	public String name() 
	{
		return name;
	}
}

package com.lala.neo4j;

import org.neo4j.graphdb.RelationshipType;

public class BankRelationshipType implements RelationshipType
{
	private String ship;
	
	public BankRelationshipType(String ship)
	{
		this.ship = ship;
	}
	public String name() 
	{
		return ship;
	}
}

package com.lala.neo4j;

import org.neo4j.graphdb.GraphDatabaseService;
import org.neo4j.graphdb.Node;
import org.neo4j.graphdb.Transaction;
import org.neo4j.graphdb.factory.GraphDatabaseFactory;

public class Neo4j 
{
	/**
	 * 標簽
	 */
	static BankLabel top = new BankLabel("總行");
	static BankLabel sdh = new BankLabel("四大銀行");
	static BankLabel fh = new BankLabel("分行");
	static BankLabel zh = new BankLabel("支行");
	
	/**
	 * 關系
	 */
	static BankRelationshipType xj = new BankRelationshipType("XJ");
	static BankRelationshipType sj = new BankRelationshipType("SJ");
	
	/**
	 * 初始化總行和分行的關系數據
	 */
	static void init1(GraphDatabaseService db)throws Exception
	{
		Node n1 = db.createNode(top);
		n1.setProperty("name", "央行");
		
		Node n2 = db.createNode(sdh);
		n2.setProperty("name", "農業銀行");
		
		Node n3 = db.createNode(sdh);
		n3.setProperty("name", "工商銀行");
		
		n1.createRelationshipTo(n2, sj);
		n2.createRelationshipTo(n1, xj);
		
		n1.createRelationshipTo(n3, sj);
		n3.createRelationshipTo(n1, xj);
	}
	
	/**
	 * 初始化農業銀行分行數據
	 */
	static void init2(GraphDatabaseService db)throws Exception
	{
		Node n1 = db.getNodeById(1);
		
		Node gd = db.createNode(fh);
		gd.setProperty("name", "農業銀行廣東分行");
		n1.createRelationshipTo(gd, sj);
		gd.createRelationshipTo(n1, xj);
		
		Node hn = db.createNode(fh);
		hn.setProperty("name", "農業銀行湖南分行");
		n1.createRelationshipTo(hn, sj);
		hn.createRelationshipTo(n1, xj);
		
		Node hb = db.createNode(fh);
		hb.setProperty("name", "農業銀行湖北分行");
		n1.createRelationshipTo(hb, sj);
		hb.createRelationshipTo(n1, xj);
		
		Node zj = db.createNode(fh);
		zj.setProperty("name", "農業銀行浙江分行");
		n1.createRelationshipTo(zj, sj);
		zj.createRelationshipTo(n1, xj);
	}
	
	/**
	 * 初始化工商銀行分行數據
	 */
	static void init3(GraphDatabaseService db)throws Exception
	{
		Node n1 = db.getNodeById(2);
		
		Node gd = db.createNode(fh);
		gd.setProperty("name", "工商銀行廣東分行");
		n1.createRelationshipTo(gd, sj);
		gd.createRelationshipTo(n1, xj);
		
		Node hn = db.createNode(fh);
		hn.setProperty("name", "工商銀行湖南分行");
		n1.createRelationshipTo(hn, sj);
		hn.createRelationshipTo(n1, xj);
		
		Node hb = db.createNode(fh);
		hb.setProperty("name", "工商銀行湖北分行");
		n1.createRelationshipTo(hb, sj);
		hb.createRelationshipTo(n1, xj);
	}
	
	/**
	 * 初始化農業銀行廣東分行以下的支行數據
	 */
	static void init4(GraphDatabaseService db)throws Exception
	{
		Node n1 = db.getNodeById(3);
		
		Node th = db.createNode(zh);
		th.setProperty("name", "農業銀行天河支行營業部");
		n1.createRelationshipTo(th, sj);
		th.createRelationshipTo(n1, xj);
		
		Node yt = db.createNode(zh);
		yt.setProperty("name", "農業銀行燕塘支行");
		n1.createRelationshipTo(yt, sj);
		yt.createRelationshipTo(n1, xj);
		
		Node thb = db.createNode(zh);
		thb.setProperty("name", "農業銀行天河北路支行");
		n1.createRelationshipTo(thb, sj);
		thb.createRelationshipTo(n1, xj);
		
		Node sp = db.createNode(zh);
		sp.setProperty("name", "農業銀行石牌東路支行");
		n1.createRelationshipTo(sp, sj);
		sp.createRelationshipTo(n1, xj);
		
		Node hy = db.createNode(zh);
		hy.setProperty("name", "農業銀行華苑支行");
		n1.createRelationshipTo(hy, sj);
		hy.createRelationshipTo(n1, xj);
	}
	
	/**
	 * start a=node(13) MATCH (a)<-[:SJ*1..3]-(b) return a,b (往上找三級，一共四級)
	 * start a=node(1) MATCH (a)-[:SJ*1..3]->(b) return a,b (往下找三級，一共四級)
	 */
	public static void main(String[] args) throws Exception
	{
		GraphDatabaseService db = new GraphDatabaseFactory().newEmbeddedDatabase("/home/admin/db/neo4j");
		
		Transaction tx = db.beginTx();
		init1(db);
		init2(db);
		init3(db);
		init4(db);
		tx.success();
		tx.close();
	}
}

cd neo4j-community-2.2.3/conf

vim neo4j-server.properties 文件。把數據庫文件夾改為上面的路徑，然後，重新啟動neo4j

訪問

http://127.0.0.1:7474

輸入默認的username/password neo4j/neo4j

然後。改動默認password

就可以查詢

以下給幾個查詢語句

查詢全部：match a return a

查詢全部標簽為‘分行‘的數據 match (a:分行) return a

start a=node(1) MATCH (a)-[:SJ*1..3]->(b) return a,b (從node id=1開始，往下找三級，一共四級)

start a=node(13) MATCH (a)<-[:SJ*1..3]-(b) return a,b (從node id=13開始。往上找三級。一共四級)

總結：neo4j非常適合保存有層級關系的數據，比方說：無限極分類

Neo4j簡單的樣例