zl程序教程

您现在的位置是:首页 >  后端

当前栏目

Spring boot项目集成Neo4j

2023-09-27 14:24:45 时间

第一步,创建Springboot工程 使用Eclipse 创建Maven项目,并修改pom.xml文件为:

<?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>

  </span><span class="tag">&lt;dependency&gt;</span><span class="pln">
     </span><span class="tag">&lt;groupId&gt;</span><span class="pln">org.springframework.boot</span><span class="tag">&lt;/groupId&gt;</span><span class="pln">
     </span><span class="tag">&lt;artifactId&gt;</span><span class="pln">spring-boot-starter-test</span><span class="tag">&lt;/artifactId&gt;</span><span class="pln">
     </span><span class="tag">&lt;scope&gt;</span><span class="pln">test</span><span class="tag">&lt;/scope&gt;</span><span class="pln">
  </span><span class="tag">&lt;/dependency&gt;</span><span class="pln">

  </span><span class="tag">&lt;dependency&gt;</span><span class="pln">
     </span><span class="tag">&lt;groupId&gt;</span><span class="pln">org.springframework.boot</span><span class="tag">&lt;/groupId&gt;</span><span class="pln">
     </span><span class="tag">&lt;artifactId&gt;</span><span class="pln">spring-boot-starter-data-neo4j</span><span class="tag">&lt;/artifactId&gt;</span><span class="pln">
  </span><span class="tag">&lt;/dependency&gt;</span><span class="pln">

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

第二步,修改配置文件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

第三步,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;

</span><span class="lit">@StartNode</span><span class="pln">
</span><span class="kwd">private</span><span class="pln"> </span><span class="typ">UserNode</span><span class="pln"> startNode</span><span class="pun">;</span><span class="pln">

</span><span class="lit">@EndNode</span><span class="pln">
</span><span class="kwd">private</span><span class="pln"> </span><span class="typ">UserNode</span><span class="pln"> endNode</span><span class="pun">;</span><span class="pln">

</span><span class="kwd">public</span><span class="pln"> </span><span class="typ">Long</span><span class="pln"> getId</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
    </span><span class="kwd">return</span><span class="pln"> id</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

</span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> setId</span><span class="pun">(</span><span class="typ">Long</span><span class="pln"> id</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
    </span><span class="kwd">this</span><span class="pun">.</span><span class="pln">id </span><span class="pun">=</span><span class="pln"> id</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

</span><span class="kwd">public</span><span class="pln"> </span><span class="typ">UserNode</span><span class="pln"> getStartNode</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
    </span><span class="kwd">return</span><span class="pln"> startNode</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

</span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> setStartNode</span><span class="pun">(</span><span class="typ">UserNode</span><span class="pln"> startNode</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
    </span><span class="kwd">this</span><span class="pun">.</span><span class="pln">startNode </span><span class="pun">=</span><span class="pln"> startNode</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

</span><span class="kwd">public</span><span class="pln"> </span><span class="typ">UserNode</span><span class="pln"> getEndNode</span><span class="pun">()</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
    </span><span class="kwd">return</span><span class="pln"> endNode</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

</span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> setEndNode</span><span class="pun">(</span><span class="typ">UserNode</span><span class="pln"> endNode</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln">
    </span><span class="kwd">this</span><span class="pun">.</span><span class="pln">endNode </span><span class="pun">=</span><span class="pln"> endNode</span><span class="pun">;</span><span class="pln">
</span><span class="pun">}</span><span class="pln">

}

第四步,repository文件----UserRepository和UserRelationRepository,@Query里面编写Cypher查询


@Component
public interface UserRepository extends GraphRepository<UserNode> {

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

    [@Query](/user/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](/user/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](/user/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);

}

第五步,修改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;
    }
}

第六步,neo4j文件注入config----Neo4jConfig,注意basePackges的路径。

@Configuration
@EnableNeo4jRepositories(basePackages = "com.example.demo.repository")
public class Neo4jConfig {
}
原文地址:http://neo4j.com.cn/topic/5a935b4a2aa9336e06418eca