spring boot 整合mongodb

spring boot 整合spring data mongodb的例子:

项目依赖

pom.xml

<parent>        <groupId>org.springframework.boot</groupId>        <artifactId>spring-boot-starter-parent</artifactId>        <version>1.5.2.RELEASE</version>    </parent>    <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-mongodb</artifactId>        </dependency>

mongodb 配置

application.yaml

spring  data:    mongodb:      host: localhost      database: test      port: 27017

实体类

实体类对应于某一个指定的集合
class Student

//指定对应的集合@Document(collection = "student")public class Student {    @Id    private long id;    private String name;    private List hobby;    private Map grade;    //get and set 省略了}    

repository

继承MongoRepository， 就可以获得简单的增删改查的功能了，系统自动帮你实现。同时，还可以按照一定的规则，生成一些自定义的查找方法具体参照 Spring data Mongodb-Query methods

package com.junhua.dao;import com.junhua.dao.StudentRepositoryCustom;import com.junhua.pojo.Student;import org.springframework.data.mongodb.repository.MongoRepository;/** * Created by xiejunhua on 2017/5/18. */public interface StudentRepository extends MongoRepository<Student, Long> {    Student findFirstByName(String name);    //支持json查询 ?0表示第一个参数    @Query("{'name': ?0}")    List<Student> findUsersByName(String name);}

自定义操作

要定义些自定义的查询和其他修改操作，需要新建一个接口StudentRepositoryCustom 和接口对应的实现类StudentRepositoryImpl 这里要特别注意实现类的名称，一定要是在StudentRepository 后面加Impl 而不能是其他的
interface StudentRepositoryCustom

package com.junhua.dao;import java.util.List;/** * Created by xiejunhua on 2017/5/18. * Customizing yourself's method to operate collection */public interface StudentRepositoryCustom {    int updateHobby(String name, List hobbies);}

class StudentRepositoryImpl

package com.junhua.dao.impl;import com.junhua.dao.StudentRepositoryCustom;import com.junhua.pojo.Student;import com.mongodb.WriteResult;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.data.mongodb.core.MongoTemplate;import org.springframework.data.mongodb.core.query.Criteria;import org.springframework.data.mongodb.core.query.Query;import org.springframework.data.mongodb.core.query.Update;import java.util.List;/** * Created by xiejunhua on 2017/5/18. * notice the class name must be StudentRepositoryImpl mustn't be StudentRepositoryCustomImpl */public class StudentRepositoryImpl implements StudentRepositoryCustom {    @Autowired    private MongoTemplate mongoTemplate;    @Override    public int updateHobby(String name, List hobbies) {        Query query = new Query(Criteria.where("name").is(name));        Update update = new Update().set("hobby", hobbies);        WriteResult result = mongoTemplate.updateFirst(query, update, Student.class);        if (result != null) {            return result.getN();        } else {            return 0;        }    }}

在class StudentRepository 加上新的继承

package com.junhua.dao;import com.junhua.pojo.Student;import org.springframework.data.mongodb.repository.MongoRepository;/** * Created by xiejunhua on 2017/5/18. */public interface StudentRepository extends MongoRepository<Student, Long>, StudentRepositoryCustom {    Student findFirstByName(String name);    @Query("{'name': ?0}")    List<Student> findUsersByName(String name);}

执行代码

class App

package com.junhua;import com.junhua.dao.StudentRepository;import com.junhua.pojo.Student;import org.springframework.boot.CommandLineRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.annotation.Bean;import org.springframework.data.mongodb.core.MongoTemplate;import java.util.ArrayList;import java.util.HashMap;import java.util.Map;/** * Created by xiejunhua on 2017/5/17. */@SpringBootApplicationpublic class App {    public static void main(String[] args) {        SpringApplication app = new SpringApplication(App.class);        app.run(args);    }    @Bean    CommandLineRunner init(StudentRepository studentRepository) {        return new CommandLineRunner() {            @Override            public void run(String... strings) throws Exception {                Student student = new Student();                ArrayList arrayList = new ArrayList();                arrayList.add("watch tv");                arrayList.add("read book");                Map map = new HashMap<String, Integer>();                map.put("math", 80);                map.put("English", 70);                student.setId(1L);                student.setName("xiaoming");                student.setHobby(arrayList);                student.setGrade(map);                studentRepository.insert(student);                Student student1 = studentRepository.findFirstByName("xiaoming");                System.out.println(student1);                }            };        };    }}

直接操作，不依赖对象映射和MongoRepository

通过MongoTemplate 来直接执行查询和修改

package com.junhua;import com.junhua.dao.StudentRepository;import com.junhua.pojo.Student;import org.springframework.boot.CommandLineRunner;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.context.annotation.Bean;import org.springframework.data.mongodb.core.MongoTemplate;import java.util.ArrayList;import java.util.HashMap;import java.util.Map;/** * Created by xiejunhua on 2017/5/17. */@SpringBootApplicationpublic class App {    public static void main(String[] args) {        SpringApplication app = new SpringApplication(App.class);        app.run(args);    }    @Bean    CommandLineRunner init(MongoTemplate mongoTemplate) {        return new CommandLineRunner() {            @Override            public void run(String... strings) throws Exception {                DBCollection dbCollection = mongoTemplate.getCollection("student");                //拿到这个对象之后，用过Mongodb官方驱动的朋友应该很熟悉 怎么操作了                BasicDBObject basicDBObject = new BasicDBObject();                basicDBObject.append("name", "xiaoming");                DBCursor dbCursor = dbCollection.find(basicDBObject);                while (dbCursor.hasNext()) {                    System.out.println(dbCursor.next());                }                }            };        };    }}

项目完整代码 github