Spring Boot配置neo4j（简单版）

图数据库的开发已经变得越来越流行，与springBoot结合也是很正常，在很早前就已经发布了相关Lib，但是当前网上的Spring Boot整合neo4j都极其复杂，也导致了本人在开发过程中耗费很长时间，顾写下这个文章帮助大众理顺neo4j整合。只需要简单六步，顺序按照编写先后顺序。

首先看整体Demo项目架构：

（一）首先导包pom.xml
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>

<groupId>com.example</groupId>
<artifactId>demo</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>demo</name>
<description>Demo project for Spring Boot</description>

<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.9.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>

<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-neo4j</artifactId>
</dependency>
</dependencies>

<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>

</project>
（二）编写配置文件application.properties
server.port=8080
spring.data.neo4j.uri=http://{neo4jweb端访问地址}:7474
spring.data.neo4j.username=neo4j账号
spring.data.neo4j.password=neo4j密码
（三）model文件---节点User和关系UserRelation，这两个文件与neo4j里面的节点和关系的属性一一对应，此处是我的示例，具体与各自的neo4j内容对于，label必须与neo4j库里名字一致

@NodeEntity(label = "User")
public class UserNode {
@GraphId
private Long nodeId;

@Property(name = "userId")
private String userId;

@Property(name = "name")
private String name;

@Property(name = "age")
private int age;

public Long getNodeId() {
return nodeId;
}

public void setNodeId(Long nodeId) {
this.nodeId = nodeId;
}

public String getUserId() {
return userId;
}

public void setUserId(String userId) {
this.userId = userId;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}
}
@RelationshipEntity(type = "UserRelation")
public class UserRelation {
@GraphId
private Long id;

@StartNode
private UserNode startNode;

@EndNode
private UserNode endNode;

public Long getId() {
return id;
}

public void setId(Long id) {
this.id = id;
}

public UserNode getStartNode() {
return startNode;
}

public void setStartNode(UserNode startNode) {
this.startNode = startNode;
}

public UserNode getEndNode() {
return endNode;
}

public void setEndNode(UserNode endNode) {
this.endNode = endNode;
}
}
（四）repository文件----UserRepository和UserRelationRepository，@Query里面编写Cypher查询

@Component
public interface UserRepository extends GraphRepository<UserNode> {

@Query("MATCH (n:User) RETURN n ")
List<UserNode> getUserNodeList();

@Query("create (n:User{age:{age},name:{name}}) RETURN n ")
List<UserNode> addUserNodeList(@Param("name") String name, @Param("age")int age);
}
@Component
public interface UserRelationRepository extends GraphRepository<UserRelation> {

@Query("match p=(n:User)<-[r:UserRelation]->(n1:User) where n.userId={firstUserId} and n1.userId={secondUserId} return p")
List<UserRelation> findUserRelationByEachId(@Param("firstUserId") String firstUserId, @Param("secondUserId") String secondUserId);

@Query("match (fu:User),(su:User) where fu.userId={firstUserId} and su.userId={secondUserId} create p=(fu)-[r:UserRelation]->(su) return p")
List<UserRelation> addUserRelation(@Param("firstUserId") String firstUserId, @Param("secondUserId") String secondUserId);

}
（五）service文件

@Service
public class Neo4jService {

@Autowired
private UserRepository userRepository;
@Autowired
private UserRelationRepository userRelationRepository;

/**
* Always use constructor based dependency injection in your beans.
* Always use assertions for mandatory dependencies.
*/

public int addUser(UserNode userNode){
userRepository.addUserNodeList(userNode.getName(),userNode.getAge());
return 1;
}
}
（六）neo4j文件注入config----Neo4jConfig，注意basePackges的路径。
@Configuration
@EnableNeo4jRepositories(basePackages = "com.example.demo.repository")
public class Neo4jConfig {
}
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