（1）依赖

compile('org.springframework.boot:spring-boot-starter-data-mongodb')

（2）application.properties配置文件

spring.data.mongodb.host=127.0.0.1
spring.data.mongodb.port=27017
spring.data.mongodb.database=test

（3）User类

@Data
public class User {

	Integer id;
	String name;
	Integer age;
	Date birth;
	
	public User(Integer id, String name, Integer age, Date birth) {
		super();
		this.id = id;
		this.name = name;
		this.age = age;
		this.birth = birth;
	}
	
}

（4）UserService类

@Service
public class UserService {

	@Autowired
	MongoTemplate mongoTemplate;
	
	public void insert(User user) {
		mongoTemplate.insert(user);
	}
	
	public long update(String name, User user) {
		Query query = new Query();
		Criteria c = new Criteria();
		c.and("name").is(name);
		query.addCriteria(c);
		Update update= new Update();
		update.set("age", user.getAge());
		update.set("birth", user.getBirth());
		WriteResult result = mongoTemplate.upsert(query, update, User.class);
		return result.getN();
    }
	
	public long remove(String name) {
		Query query = new Query();
		Criteria c = new Criteria();
		c.and("name").is(name);
		query.addCriteria(c);
		WriteResult result = mongoTemplate.remove(query, User.class);
		return result.getN();
    }
	
    public User findOne(String name, Integer age) {
		Query query = new Query();
		Criteria c = new Criteria();
		c.and("name").is(name);
		c.and("age").gte(age);
		query.addCriteria(c);
		return mongoTemplate.findOne(query, User.class);
    }
	
    public List<User> find(Integer age) {
		Query query = new Query();
		Criteria c = new Criteria();
		c.and("age").gt(age);
		query.addCriteria(c);
		return mongoTemplate.find(query, User.class);
    }
    
    public long count(Integer age) {
		Query query = new Query();
		Criteria c = new Criteria();
		c.and("age").gte(age);
		query.addCriteria(c);
		return mongoTemplate.count(query, User.class);
    }
    
}

（5）测试和测试结果

User user1 = new User(1, "tom", 1, new Date());
User user2 = new User(2, "jerry", 2, new Date());
User user3 = new User(3, "diana", 3, new Date());
userService.insert(user1);
userService.insert(user2);
userService.insert(user3);
User user = userService.findOne("tom", 1);
log.info("user:{}", user);
List<User> list = userService.find(1);
log.info("list:{}", list);
long count = userService.count(1);
log.info("count:{}", count);
User tom = new User(1, "tom", 5, new Date());
long n1 = userService.update("tom", tom);
log.info("n1:{}", n1);
long n2 = userService.remove("tom");
log.info("n2:{}", n2);

2024-01-26 16:21:15 [http-nio-8080-exec-2] INFO  cn.hwd.controller.TestController - user:User(id=1, name=tom, age=1, birth=Fri Jan 26 16:21:15 CST 2024) 
2024-01-26 16:21:15 [http-nio-8080-exec-2] INFO  cn.hwd.controller.TestController - list:[User(id=2, name=jerry, age=2, birth=Fri Jan 26 16:21:15 CST 2024), User(id=3, name=diana, age=3, birth=Fri Jan 26 16:21:15 CST 2024)] 
2024-01-26 16:21:15 [http-nio-8080-exec-2] INFO  cn.hwd.controller.TestController - count:3 
2024-01-26 16:21:15 [http-nio-8080-exec-2] INFO  cn.hwd.controller.TestController - n1:1 
2024-01-26 16:21:15 [http-nio-8080-exec-2] INFO  cn.hwd.controller.TestController - n2:1