springboot集成Neo4j，代碼示例

寫在前面

本文基於 Docker 搭建 Neo4J服務，提供web管理頁面

詳細搭建過程，可參考這裏 Neo4J示例練習

更多學習，可官網自行學習，官網

一、項目搭建

Maven 工程

1.1、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>

    <artifactId>spring-boot-demo-neo4j</artifactId>
    <version>1.0.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>spring-boot-demo-neo4j</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.0.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-data-neo4j</artifactId>
        </dependency>

        <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.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>cn.hutool</groupId>
            <artifactId>hutool-all</artifactId>
            <version>5.0.0</version>
        </dependency>

        <dependency>
            <groupId>com.google.guava</groupId>
            <artifactId>guava</artifactId>
            <version>28.2-jre</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>spring-boot-demo-neo4j</finalName>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

1.2、application.yml配置

spring:
  data:
    neo4j:
      uri: bolt://192.168.1.74:7687
      username: neo4j
      password: admin
      open-in-view: false

二、測試

package com.tonels.neo4j;

import cn.hutool.json.JSONUtil;
import com.tonels.neo4j.service.NeoService;
import com.tonels.neo4j.model.Lesson;
import com.tonels.neo4j.model.Student;
import lombok.extern.slf4j.Slf4j;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Autowired;

import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

@Slf4j
public class Neo4jTest extends SpringBootDemoNeo4jApplicationTests {
    @Autowired
    private NeoService neoService;

    /**
     * 測試保存
     */
    @Test
    public void testSave() {
        neoService.initData();
    }

    /**
     * 測試刪除
     */
    @Test
    public void testDelete() {
        neoService.delete();
    }

    /**
     * 測試查詢 鳴人 學了哪些課程
     */
    @Test
    public void testFindLessonsByStudent() {
        // 深度爲1，則課程的任教老師的屬性爲null
        // 深度爲2，則會把課程的任教老師的屬性賦值
        List<Lesson> lessons = neoService.findLessonsFromStudent("漩渦鳴人", 2);

        lessons.forEach(lesson -> log.info("【lesson】= {}", JSONUtil.toJsonStr(lesson)));
    }

    /**
     * 測試查詢班級人數
     */
    @Test
    public void testCountStudent() {
        Long all = neoService.studentCount(null);
        log.info("【全校人數】= {}", all);
        Long seven = neoService.studentCount("第七班");
        log.info("【第七班人數】= {}", seven);
    }

    /**
     * 測試根據課程查詢同學關係
     */
    @Test
    public void testFindClassmates() {
        Map<String, List<Student>> classmates = neoService.findClassmatesGroupByLesson();
        classmates.forEach((k, v) -> log.info("因爲一起上了【{}】這門課，成爲同學關係的有：{}", k, JSONUtil.toJsonStr(v.stream()
                .map(Student::getName)
                .collect(Collectors.toList()))));
    }

    /**
     * 查詢所有師生關係，包括班主任/學生，任課老師/學生
     */
    @Test
    public void testFindTeacherStudent() {
        Map<String, Set<Student>> teacherStudent = neoService.findTeacherStudent();
        teacherStudent.forEach((k, v) -> log.info("【{}】教的學生有 {}", k, JSONUtil.toJsonStr(v.stream()
                .map(Student::getName)
                .collect(Collectors.toList()))));
    }
}

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