SpringBoot2.x系列教程53--NoSQL之SpringBoot整合Neo4j
一. Spring Boot中整合Neo4j
我们上一章节简单介绍了Neo4j及其安装配置过程，这节带大家学习在Spring Boot中整合Neo4j.
1. 创建web项目
我们按照之前的经验，创建一个web程序，并将之改造成Spring Boot项目，具体过程略。

2. 添加依赖包
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-neo4j</artifactId>
</dependency>
3. 创建配置文件
#neo4j
spring:
data:
neo4j:
uri: bolt://localhost:7474
username: neo4j
password: neo4j
4. 创建Neo4j的配置类
注解@EnableNeo4jRepositories用来开启Neo4j的仓库功能；
注解@EnableTransactionManagement用来支持事务。
package com.yyg.boot.config;
import org.neo4j.driver.AuthTokens;
import org.neo4j.driver.Driver;
import org.neo4j.driver.GraphDatabase;
import org.neo4j.driver.Session;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.neo4j.repository.config.EnableNeo4jRepositories;
import org.springframework.transaction.annotation.EnableTransactionManagement;
/**
* @Author 一一哥Sun
* @Date Created in 2020/4/10
* @Description Description
*/
@Configuration
@EnableNeo4jRepositories(basePackages = "com.yyg.boot.repository")
@EnableTransactionManagement
public class Neo4jConfig {
@Value("${spring.data.neo4j.uri}")
private String url;
@Value("${spring.data.neo4j.username}")
private String username;
@Value("${spring.data.neo4j.password}")
private String password;
@Bean(name = "session")
public Session neo4jSession() {
Driver driver = GraphDatabase.driver(url, AuthTokens.basic(username, password));
return driver.session();
}
}
5. 创建关系节点实体类
ParentNode类
package com.yyg.boot.entity;
import lombok.Data;
import lombok.ToString;
import org.neo4j.ogm.annotation.*;
import java.util.HashSet;
import java.util.Set;
/**
* @Author 一一哥Sun
* @Date Created in 2020/4/10
* @Description Description
*/
@Data
@ToString
@NodeEntity("ParentNode")
public class ParentNode {
@Id
@GeneratedValue
private Long id;
private @Property(name = "name")
String name;
private @Relationship(type = "RelationEdge")
Set<RelationNode> sets = new HashSet<>();
public ParentNode(String name) {
this.name = name;
}
public void addRelation(SonNode sonNode, String name) {
RelationNode relationNode = new RelationNode(this, name, sonNode);
sets.add(relationNode);
sonNode.getSets().add(relationNode);
}
}
SonNode类
package com.yyg.boot.entity;
import lombok.Data;
import lombok.ToString;
import org.neo4j.ogm.annotation.*;
import java.util.HashSet;
import java.util.Set;
/**
* @Author 一一哥Sun
* @Date Created in 2020/4/10
* @Description Description
*/
@NodeEntity("SonNode")
@Data
@ToString
public class SonNode {
@Id
@GeneratedValue
private Long id;
@Property(name = "name")
private String name;
private @Relationship(type = "RelationEdge", direction = "INCOMING")
Set<RelationNode> sets = new HashSet<>();
public SonNode(String name) {
this.name = name;
}
}
RelationNode节点类
package com.yyg.boot.entity;
import lombok.Data;
import lombok.ToString;
import org.neo4j.ogm.annotation.*;
/**
* @Author 一一哥Sun
* @Date Created in 2020/4/10
* @Description Description
*/
@RelationshipEntity(type = "RelationEdge")
@Data
@ToString
public class RelationNode {
@Id
@GeneratedValue
private Long id;
private @StartNode
ParentNode parentNode;
// 关系名
private String name;
private @EndNode
SonNode sonNode;
RelationNode(ParentNode parentNode, String name, SonNode sonNode) {
this.parentNode = parentNode;
this.name = name;
this.sonNode = sonNode;
}
}
6. 创建Repository仓库类
package com.yyg.boot.repository;
import com.yyg.boot.entity.ParentNode;
import org.springframework.data.neo4j.repository.Neo4jRepository;
/**
* @Author 一一哥Sun
* @Date Created in 2020/4/10
* @Description Description
*/
public interface ParentRepository extends Neo4jRepository<ParentNode,Long> {
}
7. 编写Controller接口方法
package com.yyg.boot.web;
import com.yyg.boot.entity.ParentNode;
import com.yyg.boot.entity.RelationNode;
import com.yyg.boot.entity.SonNode;
import com.yyg.boot.repository.ParentRepository;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.util.Iterator;
import java.util.Set;
/**
* @Author 一一哥Sun
* @Date Created in 2020/4/10
* @Description Description
*/
@RestController
@RequestMapping("/node")
@Slf4j
public class Neo4jController {
@Autowired
private ParentRepository parentRepository;
@GetMapping(value = "/create")
public void createNodeRelation() {
SonNode sonNode1 = new SonNode("儿子小帅");
SonNode sonNode2 = new SonNode("女儿小美");
ParentNode parentNode = new ParentNode("爸爸:孙一一");
parentNode.addRelation(sonNode1, "女儿");
parentNode.addRelation(sonNode2, "儿子");
parentRepository.save(parentNode);
}
@GetMapping(value = "/find")
public void findNodes() {
Iterable<ParentNode> parentNodes = parentRepository.findAll();
for (ParentNode parentNode : parentNodes) {
Set<RelationNode> relationNodeSet = parentNode.getSets();
for (RelationNode relationNode : relationNodeSet) {
log.info("id:" + parentNode.getId() + " name:" + parentNode.getName() + " 关系：" + relationNode.getName() + "子节点：" + relationNode.getSonNode().getName());
}
}
}
}
8. 创建入口类
package com.yyg.boot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* @Author 一一哥Sun
* @Date Created in 2020/4/9
* @Description Description
*/
@SpringBootApplication
public class Neo4jApplication {
public static void main(String[] args) {
SpringApplication.run(Neo4jApplication.class, args);
}
}
完整目录结构

9. 启动项目进行测试
注意:
要先执行/node/create接口，再执行/node/find接口，结果如图：

