Neo4J：spring-boot-starter-data-neo4j简单应用

我不是女神ヾ 2023-05-31 03:00 115阅读 0赞

### 1、spring-boot-starter-data-neo4j基本环节 ###

（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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>2.2.0.RELEASE</version>
            <relativePath/> 
        </parent>
        <groupId>com.example</groupId>
        <artifactId>neo4j-demo</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <name>neo4j-demo</name>
        <description>Demo project for Spring Boot</description>
    
        <properties>
            <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-data-neo4j</artifactId>
            </dependency>
            <dependency>
                <groupId>org.neo4j</groupId>
                <artifactId>neo4j-ogm-http-driver</artifactId>
                <version>3.2.1</version>
            </dependency>
            <dependency>
                <groupId>org.projectlombok</groupId>
                <artifactId>lombok</artifactId>
                <optional>true</optional>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
                <exclusions>
                    <exclusion>
                        <groupId>org.junit.vintage</groupId>
                        <artifactId>junit-vintage-engine</artifactId>
                    </exclusion>
                </exclusions>
            </dependency>
        </dependencies>
    
        <build>
            <plugins>
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                </plugin>
            </plugins>
        </build>
    
    </project>

（2）application.properties

#neo4j
    spring.data.neo4j.username=neo4j
    spring.data.neo4j.password=123456
    spring.data.neo4j.uri=http://10.17.12.158:7474

### 2、实体类 ###

package com.example.neo4j.bean;
    
    import lombok.Data;
    import lombok.NoArgsConstructor;
    import org.neo4j.ogm.annotation.GeneratedValue;
    import org.neo4j.ogm.annotation.Id;
    import org.neo4j.ogm.annotation.NodeEntity;
    import org.neo4j.ogm.annotation.Property;
    
    @NodeEntity(label = "Person")
    @Data
    @NoArgsConstructor
    public class PersonBean {
    
        /**
         * @GraphId也不支持
         * 需要改成@Id + @GeneratedValue
         */
        @Id
        @GeneratedValue
        Long id;
    
        @Property(name = "name")
        private String name;
    }

package com.example.neo4j.bean;
    
    import lombok.Data;
    import lombok.NoArgsConstructor;
    import org.neo4j.ogm.annotation.*;
    
    @RelationshipEntity(type = "LOVES")
    @Data
    @NoArgsConstructor
    public class LoveBean {
        @Id
        @GeneratedValue
        private Long id;
    
        @StartNode
        private PersonBean startNode;
    
        @EndNode
        private PersonBean endNode;
    }

### 3、DAO ###

package com.example.neo4j.dao;
    
    import com.example.neo4j.bean.PersonBean;
    import org.springframework.data.neo4j.repository.Neo4jRepository;
    
    public interface PersonRepository extends Neo4jRepository<PersonBean,Long> {
    
    }

package com.example.neo4j.dao;
    
    import com.example.neo4j.bean.LoveBean;
    import org.springframework.data.neo4j.repository.Neo4jRepository;
    
    public interface LoveRepository extends Neo4jRepository<LoveBean,Long> {
    
    }

### 4、service ###

package com.example.neo4j.service;
    
    import com.example.neo4j.bean.LoveBean;
    import com.example.neo4j.bean.PersonBean;
    
    public interface PersonService {
    
        PersonBean addPerson(PersonBean person);
        PersonBean findOnePerson(long id);
        LoveBean loves(LoveBean love);
    }

package com.example.neo4j.service.impl;
    
    import com.example.neo4j.bean.LoveBean;
    import com.example.neo4j.bean.PersonBean;
    import com.example.neo4j.dao.LoveRepository;
    import com.example.neo4j.dao.PersonRepository;
    import com.example.neo4j.service.PersonService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.stereotype.Service;
    
    @Service
    public class PersonServiceImpl implements PersonService {
    
        @Autowired
        private PersonRepository personRepository;
    
        @Autowired
        private LoveRepository loveRepository;
    
        @Override
        public PersonBean addPerson(PersonBean person){
            return personRepository.save(person);
        }
    
        @Override
        public PersonBean findOnePerson(long id) {
            return personRepository.findById(id).get();
        }
    
        @Override
        public LoveBean loves(LoveBean love) {
            return loveRepository.save(love);
        }
    
    }

### 5、web ###

package com.example.neo4j.web;
    
    import com.example.neo4j.bean.LoveBean;
    import com.example.neo4j.bean.PersonBean;
    import com.example.neo4j.service.PersonService;
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.web.bind.annotation.PathVariable;
    import org.springframework.web.bind.annotation.RequestMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    @RequestMapping("/person")
    public class PersonController {
    
        @Autowired
        private PersonService personService;
    
        @RequestMapping("/addPerson/{name}")
        public PersonBean addPerson(@PathVariable("name")String name) {
            PersonBean person=new PersonBean();
            person.setName(name);
            return personService.addPerson(person);
        }
    
        @RequestMapping("/loves/{id1}/{id2}")
        public LoveBean loves(@PathVariable("id1")String id1,@PathVariable("id2")String id2){
            PersonBean person1=personService.findOnePerson(Long.parseLong(id1));
            PersonBean person2=personService.findOnePerson(Long.parseLong(id2));
            LoveBean love=new LoveBean();
            love.setStartNode(person1);
            love.setEndNode(person2);
            return personService.loves(love);
        }
    }

### 6、运行效果 ###

http://localhost:8080/person/addPerson/qiang  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70]  
http://localhost:8080/person/addPerson/juan  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 2]

http://localhost:8080/person/loves/1154/1156  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 3]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 4]  
http://localhost:8080/person/loves/1156/1154  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 5]  
http://localhost:8080/person/loves/1156/1154  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2NoZW5neXVxaWFuZw_size_16_color_FFFFFF_t_70 6]

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