<dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb</artifactId>
        </dependency>

spring:
  data:
    mongodb:
      uri: mongodb://localhost:27017/test

package com.example.springboot_mongdb.domain;
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
import org.springframework.data.mongodb.core.mapping.Field;
/**
 * @Author: Ljx
 * @Date: 2021/12/5 21:57
 * @role:
 */
/**
 * 使用@Document建立的是实体类和collection的关系
 * @author jijunxiang
 */
@Document("test")
public class Article {
    /**
     * 用来标识主键
     */
    @Id
    private Integer id;
    /**
     * 使用Field建立实体类中属性跟collection中字段的映射关系，如果省略，代表两个名称一致
     */
//    @Field
    private String name;
    private String content;
    private Integer hits;
    public Integer getId() {
        return id;
    }
    public void setId(Integer id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getContent() {
        return content;
    }
    public void setContent(String content) {
        this.content = content;
    }
    public Integer getHits() {
        return hits;
    }
    public void setHits(Integer hits) {
        this.hits = hits;
    }
    @Override
    public String toString() {
        return "Article{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", content='" + content + '\'' +
                ", hits=" + hits +
                '}';
    }
}

package com.example.springboot_mongdb.dao;
import com.example.springboot_mongdb.domain.Article;
import org.springframework.data.mongodb.repository.MongoRepository;
import org.springframework.stereotype.Repository;
import java.util.List;
/**
 * @Author: Ljx
 * @Date: 2021/12/5 22:08
 * @role:
 */
@Repository
public interface ArticleDao extends MongoRepository<Article,Integer> {
    /**
     * 根据标题查询
     * @param name
     * @return
     */
    List<Article> findByNameLike(String name);
    /**
     * 根据点击量查询
     * @param hits
     * @return
     */
    List<Article> findByHitsGreaterThan(Integer hits);
}

package com.example.springboot_mongdb;
import com.example.springboot_mongdb.dao.ArticleDao;
import com.example.springboot_mongdb.domain.Article;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Sort;
import java.util.List;
import java.util.Optional;
@SpringBootTest
class ArticleDaoTest {
    @Autowired
    private ArticleDao articleDao;
    //保存
    @Test
    public void testSave(){
        Article article = new Article();
        article.setId(1);
        article.setName("测试");
        article.setContent("成功添加");
        article.setHits(100);
        articleDao.save(article);
    }
    //保存
    @Test
    public void testUpdate(){
        Article article = new Article();
        article.setId(1);
        article.setName("测试1");
        article.setContent("成功添加1");
        article.setHits(200);
        articleDao.save(article);
    }
    //删除
    @Test
    public void testDelete(){
        articleDao.deleteById(1);
    }
    //添加数据
    @Test
    public void makeDate(){
        for (int i = 1; i <= 10; i++) {
            Article article = new Article();
            article.setId(i);
            article.setName("测试"+i);
            article.setContent("成功添加"+i);
            article.setHits(200+i);
            articleDao.save(article);
        }
    }
    //主键查询
    @Test
    public void testFindAll(){
        List<Article> articles = articleDao.findAll();
        for (Article article : articles) {
            System.out.println(article);
        }
    }
    //主键查询
    @Test
    public void testFindById(){
        Optional<Article> optional = articleDao.findById(1);
        System.out.println(optional.get());
    }
    //分页和排序
    @Test
    public void testFindAllWithPageAndSort(){
        //设置排序条件
        Sort sort = Sort.by(Sort.Order.desc("hits"));
        //设置分页条件
        PageRequest pageRequest = PageRequest.of(1, 3, sort);
        Page<Article> page = articleDao.findAll(pageRequest);
        for (Article article : page.getContent()) {
            System.out.println(article);
        }
    }
    //根据标题查询
    @Test
    public void testFindByName(){
        List<Article> articles = articleDao.findByNameLike("li");
        for (Article article : articles) {
            System.out.println(article);
        }
    }
    //根据点击量查询
    @Test
    public void testFindByHitsGreaterThan(){
        List<Article> articles = articleDao.findByHitsGreaterThan(105);
        for (Article article : articles) {
            System.out.println(article);
        }
    }
}