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✨ spring-boot-demo-neo4j 完成
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‎spring-boot-demo-neo4j/README.md

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4. 启动容器：`docker start neo4j-3.5.0`
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5. 浏览器 http://localhost:7474/ 访问 neo4j 管理后台，初始账号/密码 neo4j/neo4j，会要求修改初始化密码，我们修改为 neo4j/admin
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## pom.xml
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```xml
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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<artifactId>spring-boot-demo-neo4j</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<packaging>jar</packaging>
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<name>spring-boot-demo-neo4j</name>
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<description>Demo project for Spring Boot</description>
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<parent>
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<groupId>com.xkcoding</groupId>
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<artifactId>spring-boot-demo</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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</parent>
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<properties>
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<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
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<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
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<java.version>1.8</java.version>
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</properties>
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<dependencies>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-data-neo4j</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-web</artifactId>
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</dependency>
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<dependency>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-starter-test</artifactId>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.projectlombok</groupId>
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<artifactId>lombok</artifactId>
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<optional>true</optional>
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</dependency>
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<dependency>
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<groupId>cn.hutool</groupId>
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<artifactId>hutool-all</artifactId>
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</dependency>
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<dependency>
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<groupId>com.google.guava</groupId>
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<artifactId>guava</artifactId>
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</dependency>
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</dependencies>
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<build>
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<finalName>spring-boot-demo-neo4j</finalName>
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<plugins>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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</plugin>
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</plugins>
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</build>
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</project>
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```
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## application.yml
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```yaml
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spring:
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data:
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neo4j:
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uri: bolt://localhost
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username: neo4j
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password: admin
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open-in-view: false
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```
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## CustomIdStrategy.java
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```java
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/**
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* <p>
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* 自定义主键策略
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* </p>
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*
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* @package: com.xkcoding.neo4j.config
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* @description: 自定义主键策略
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* @author: yangkai.shen
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* @date: Created in 2018-12-24 14:40
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* @copyright: Copyright (c) 2018
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* @version: V1.0
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* @modified: yangkai.shen
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*/
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public class CustomIdStrategy implements IdStrategy {
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@Override
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public Object generateId(Object o) {
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return IdUtil.fastUUID();
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}
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}
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```
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## 部分Model代码
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### Student.java
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```java
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/**
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* <p>
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* 学生节点
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* </p>
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*
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* @package: com.xkcoding.neo4j.model
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* @description: 学生节点
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* @author: yangkai.shen
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* @date: Created in 2018-12-24 14:38
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* @copyright: Copyright (c) 2018
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* @version: V1.0
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* @modified: yangkai.shen
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*/
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@Data
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@NoArgsConstructor
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@RequiredArgsConstructor(staticName = "of")
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@AllArgsConstructor
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@Builder
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@NodeEntity
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public class Student {
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/**
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* 主键，自定义主键策略，使用UUID生成
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*/
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@Id
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@GeneratedValue(strategy = CustomIdStrategy.class)
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private String id;
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/**
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* 学生姓名
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*/
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@NonNull
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private String name;
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/**
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* 学生选的所有课程
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*/
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@Relationship(NeoConsts.R_LESSON_OF_STUDENT)
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@NonNull
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private List<Lesson> lessons;
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/**
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* 学生所在班级
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*/
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@Relationship(NeoConsts.R_STUDENT_OF_CLASS)
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@NonNull
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private Class clazz;
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}
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```
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## 部分Repository代码
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### StudentRepository.java
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```java
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/**
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* <p>
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* 学生节点Repository
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* </p>
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*
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* @package: com.xkcoding.neo4j.repository
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* @description: 学生节点Repository
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* @author: yangkai.shen
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* @date: Created in 2018-12-24 15:05
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* @copyright: Copyright (c) 2018
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* @version: V1.0
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* @modified: yangkai.shen
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*/
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public interface StudentRepository extends Neo4jRepository<Student, String> {
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/**
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* 根据名称查找学生
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*
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* @param name 姓名
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* @param depth 深度
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* @return 学生信息
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*/
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Optional<Student> findByName(String name, @Depth int depth);
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/**
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* 根据班级查询班级人数
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*
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* @param className 班级名称
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* @return 班级人数
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*/
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@Query("MATCH (s:Student)-[r:R_STUDENT_OF_CLASS]->(c:Class{name:{className}}) return count(s)")
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Long countByClassName(@Param("className") String className);
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/**
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* 查询满足 (学生)-[选课关系]-(课程)-[选课关系]-(学生) 关系的 同学
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*
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* @return 返回同学关系
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*/
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@Query("match (s:Student)-[:R_LESSON_OF_STUDENT]->(l:Lesson)<-[:R_LESSON_OF_STUDENT]-(:Student) with l.name as lessonName,collect(distinct s) as students return lessonName,students")
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List<ClassmateInfoGroupByLesson> findByClassmateGroupByLesson();
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/**
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* 查询师生关系，(学生)-[班级学生关系]-(班级)-[班主任关系]-(教师)
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*
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* @return 返回师生关系
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*/
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@Query("match (s:Student)-[:R_STUDENT_OF_CLASS]->(:Class)-[:R_BOSS_OF_CLASS]->(t:Teacher) with t.name as teacherName,collect(distinct s) as students return teacherName,students")
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List<TeacherStudent> findTeacherStudentByClass();
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/**
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* 查询师生关系，(学生)-[选课关系]-(课程)-[任教老师关系]-(教师)
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*
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* @return 返回师生关系
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*/
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@Query("match ((s:Student)-[:R_LESSON_OF_STUDENT]->(:Lesson)-[:R_TEACHER_OF_LESSON]->(t:Teacher))with t.name as teacherName,collect(distinct s) as students return teacherName,students")
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List<TeacherStudent> findTeacherStudentByLesson();
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}
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```
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## Neo4jTest.java
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```java
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/**
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* <p>
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* 测试Neo4j
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* </p>
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*
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* @package: com.xkcoding.neo4j
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* @description: 测试Neo4j
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* @author: yangkai.shen
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* @date: Created in 2018-12-24 15:17
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* @copyright: Copyright (c) 2018
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* @version: V1.0
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* @modified: yangkai.shen
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*/
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@Slf4j
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public class Neo4jTest extends SpringBootDemoNeo4jApplicationTests {
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@Autowired
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private NeoService neoService;
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/**
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* 测试保存
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*/
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@Test
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public void testSave() {
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neoService.initData();
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}
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/**
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* 测试删除
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*/
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@Test
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public void testDelete() {
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neoService.delete();
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}
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/**
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* 测试查询 鸣人 学了哪些课程
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*/
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@Test
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public void testFindLessonsByStudent() {
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// 深度为1，则课程的任教老师的属性为null
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// 深度为2，则会把课程的任教老师的属性赋值
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List<Lesson> lessons = neoService.findLessonsFromStudent("漩涡鸣人", 2);
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lessons.forEach(lesson -> log.info("【lesson】= {}", JSONUtil.toJsonStr(lesson)));
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}
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/**
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* 测试查询班级人数
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*/
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@Test
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public void testCountStudent() {
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Long all = neoService.studentCount(null);
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log.info("【全校人数】= {}", all);
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Long seven = neoService.studentCount("第七班");
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log.info("【第七班人数】= {}", seven);
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}
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/**
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* 测试根据课程查询同学关系
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*/
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@Test
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public void testFindClassmates() {
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Map<String, List<Student>> classmates = neoService.findClassmatesGroupByLesson();
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classmates.forEach((k, v) -> log.info("因为一起上了【{}】这门课，成为同学关系的有：{}", k, JSONUtil.toJsonStr(v.stream()
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.map(Student::getName)
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.collect(Collectors.toList()))));
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}
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/**
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* 查询所有师生关系，包括班主任/学生，任课老师/学生
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*/
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@Test
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public void testFindTeacherStudent() {
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Map<String, Set<Student>> teacherStudent = neoService.findTeacherStudent();
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teacherStudent.forEach((k, v) -> log.info("【{}】教的学生有 {}", k, JSONUtil.toJsonStr(v.stream()
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.map(Student::getName)
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.collect(Collectors.toList()))));
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}
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}
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```
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## 截图
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运行测试类之后，可以通过访问 http://localhost:7474 ，查看neo里所有节点和关系
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![image-20181225150513101](assets/image-20181225150513101-5721513.png)
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## 参考
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- spring-data-neo4j 官方文档：https://docs.spring.io/spring-data/neo4j/docs/5.1.2.RELEASE/reference/html/
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- neo4j 官方文档：https://neo4j.com/docs/getting-started/3.5/

‎spring-boot-demo-neo4j/assets/image-20181225150513101-5721513.png

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