转载自：https://blog.csdn.net/sinat_35821285/article/details/83511203#commentBox

1.首先pom.xml

<!-- springboot 整合 mongodb   -->
   <dependency> 
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-mongodb</artifactId>
        <version>2.0.0.RELEASE</version>
   </dependency>

引入

@Autowired
private MongoTemplate mongoTemplate;

插入数据（可以是一个对象，或者是一个对象集合）

List<SysUser> userList = new ArrayList<>();
userList.add(new SysUser(11,"1","白小飞","18888888888"));
userList.add(new SysUser(9,"1","白敬亭","13333333333"));
userList.add(new SysUser(5,"1","林宥嘉","14444444444"));
userList.add(new SysUser(6,"1","彭于晏","15555555555"));
userList.add(new SysUser(7,"1","周杰伦","16666666666"));
mongoTemplate.insert(userList, "userList");

SysUser sysUser = new SysUser(12,"1","黄小飞","18888888888");
mongoTemplate.insert(sysUser, "userList");

当存入的第一个数据类型是SysUser，名字是userList的时候，第二个存入数据就必须是SysUser类型的数据。

查询数据

查询单个数据和多个数据，模糊查询

//查询单个数据
    public SysUser findMongo() {
        Pattern pattern = Pattern.compile("^.*8$",Pattern.CASE_INSENSITIVE);
        Query query = new Query(Criteria.where("phone").regex(pattern));
        SysUser findOne = mongoTemplate.findOne(query,SysUser.class,"userList");
        return findOne;
    }

    //查询多个数据
    public List<SysUser> findListMongo() {
        //模糊查询以 ^开始 以$结束 .*相当于Mysql中的%
        Pattern pattern = Pattern.compile("^1.*$",Pattern.CASE_INSENSITIVE);
        Query query = new Query(Criteria.where("phone").regex(pattern));
//        Query query = new Query(Criteria.where("status").is("1"));
//        query.with(new Sort(Direction.DESC,"phone"));  //按手机号码倒序
         List<SysUser> findList = mongoTemplate.find(query,SysUser.class,"userList");
        return findList;
    }

 

//多个条件查询(格式2)
public List<SysUser> findList2(){
    Criteria criteria = new Criteria();
    criteria.and("name").is("秦岚");
    criteria.and("phone").is("12222222222");
    Query query = new Query(criteria);
    List<SysUser> findList = mongoTemplate.find(query, SysUser.class,"userList");
    return findList;
}

//一个模糊关键字匹配多个字段
    public List<SysUser> findList3(){
            
        Pattern pattern = Pattern.compile("^.*222$",Pattern.CASE_INSENSITIVE);
        Criteria  criteria = new Criteria();
        //phone以222结尾的 或者 name以222结尾的  
        criteria.orOperator(Criteria.where("phone").regex(pattern),
        Criteria.where("name").regex(pattern));
        //同时满足 phone以222结尾的，和name以222结尾的
       criteria.andOperator(Criteria.where("phone").regex(pattern),
        Criteria.where("name").regex(pattern));
            
        Query query = new Query(criteria);
        List<SysUser> find = mongoTemplate.find(query, SysUser.class,"userList");
        return find;
    }

更新。

//更新
public int update() {
    Query query = new Query(); 
    query.addCriteria(Criteria.where("_id").is(1));  //_id区分引号 "1"和1
    Update update = Update.update("name", "zzzzz");
//    WriteResult upsert = mongoTemplate.updateMulti(query, update, "userList"); //查询到的全部更新
//    WriteResult upsert = mongoTemplate.updateFirst(query, update, "userList"); //查询更新第一条
    WriteResult upsert = mongoTemplate.upsert(query, update, "userList");      //有则更新，没有则新增
    return upsert.getN();       //返回执行的条数
    }

 

//添加内嵌文档数据（有则直接加入，没有则进行新增）
    public int update1() {
        Query query = Query.query(Criteria.where("_id").is("11"));
        SysUser user = new SysUser(1,"1","lisi","19999998745");
        Update update = new Update();
        update.addToSet("users", user);
        WriteResult upsert = mongoTemplate.upsert(query, update, "userList");
        return upsert.getN();
    }

 

//修改内嵌文档中数据
public int update2() {
    //查询_id为11并且其中userList文档的_id为1的
    Query query = Query.query(Criteria.where("_id").is("11").and("users._id").is(1));
    Update update = Update.update("users.$.name", "zhangsan");
    WriteResult upsert = mongoTemplate.upsert(query, update, "userList");
    return upsert.getN();
}

 

//删除内嵌文档中数据
    public int delete() {
    //查询_id为11并且其中userList文档的_id为1的
    Query query = Query.query(Criteria.where("_id").is("11").and("users._id").is(1));
    Update update = new Update();
    update.unset("users.$");
    WriteResult upsert = mongoTemplate.updateFirst(query, update, "userList");
    return upsert.getN();
}

查询多个数据删除之后是这样的：