Spring boot项目集成Neo4j
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"><dependency></span><span class="pln"> </span><span class="tag"><groupId></span><span class="pln">org.springframework.boot</span><span class="tag"></groupId></span><span class="pln"> </span><span class="tag"><artifactId></span><span class="pln">spring-boot-starter-test</span><span class="tag"></artifactId></span><span class="pln"> </span><span class="tag"><scope></span><span class="pln">test</span><span class="tag"></scope></span><span class="pln"> </span><span class="tag"></dependency></span><span class="pln"> </span><span class="tag"><dependency></span><span class="pln"> </span><span class="tag"><groupId></span><span class="pln">org.springframework.boot</span><span class="tag"></groupId></span><span class="pln"> </span><span class="tag"><artifactId></span><span class="pln">spring-boot-starter-data-neo4j</span><span class="tag"></artifactId></span><span class="pln"> </span><span class="tag"></dependency></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 {
}
