1,首先,在pom.xml中添加依赖:
<dependencies><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-mongodb</artifactId></dependency><!--上面这个依赖包含了Spring Data MongoDB的所有必要组件,下面是Springboot的start--><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency>
</dependencies>
2,在 application.properties 或 application.yml 中配置MongoDB连接:
spring.data.mongodb.uri=mongodb://username:password@localhost:27017/my_database
3,然后,例如创建一个实体类User:
该实体类是映射MongoDB集合中的文档。
import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;@Document
public class User {@Idprivate String id;private String name;private String deptName;private int age;private int salary;private int pageNum;private int pageSize;// 省略构造器、getter和setter方法
}
4,创建一个UserRepository接口:
使用Spring Data MongoDB提供的Repository接口来操作MongoDB,
这个接口继承自MongoRepository,它提供了基本的CRUD操作;
import org.springframework.data.mongodb.repository.MongoRepository;public interface UserRepository extends MongoRepository<User, String> {// 这里MongoRepository提供了基本的CRUD方法,也可以自定义查询方法}
5,创建一个UserService服务类:
该服务类来调用Repository接口,
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;import java.util.List;
import java.util.Optional;@Service
public class UserService {@Autowiredprivate UserRepository userRepository;@Autowiredprivate MongoTemplate mongoTemplate;// 新增public User saveUser(User user) {// 单个新增mongoTemplate.save(user);// 批量插入// List<User> users = new ArrayList<>();// users.add(...);// mongoTemplate.save(users, User.class);}// 精确查询public Optional<User> getUserById(String id) {return mongoTemplate.findById(id);}// 模糊查询public Optional<User> getUserByCondition(String name) {String param = (null == name) ? "" : name.trim();Criteria criteria = Criteria.where("name").regex(".*" + param + ".*");/** 上面正则匹配包含param的情况,下面是匹配以param为开头的情况*///Criteria criteria = Criteria.where("name").regex("^" + param);Query query = new Query(criteria);List<User> result = mongoTemplate.find(query, User.class); return result;}// 模糊分页并排序查询public Optional<User> getUserByCondition(User user) {// 创建各种查询条件Criteria criteria = new Criteria().andOperator(Criteria.where("age").gte(40),Criteria.where("salary").gt(500)).orOperator(Criteria.where("name").regex("a"),Criteria.where("name").regex("b"));// 创建查询对象Query query = new Query(criteria);// 并指定排序方式query.with(Sort.by(Sort.Order.desc("age"),Sort.Order.asc("name")))// 分页处理.skip(pageNum*pageSize).limit(pageSize); List<User> result = mongoTemplate.find(query, User.class); return result;}// 全部查询public List<User> getAllUsers() {return userRepository.findAll();}// 精确更新操作public void update(User user) {if (null == user) {return;}Criteria criteria = Criteria.where("id").is(user.getId());Query query = new Query(criteria);Update updateObj = new Update().set("age", user.getAge());mongoTemplate.updateFirst(query, updateObj, User.class);}// 批量更新操作public void update(User user) {if (null == user) {return;}Criteria criteria = Criteria.where("salary").gt(300);Query query = new Query(criteria);Update updateObj = new Update().set("salary", 600).set("deptName", "工程部");// 仅更新第一条mongoTemplate.updateFirst(query, updateObj, User.class);// 全部更新mongoTemplate.updateMulti(query, updateObj, User.class);}// 删除public void deleteUserById(String id) {Criteria criteria = Criteria.where("id").is(id); Query query = new Query(criteria);mongoTemplate.remove(query,User.class);}
}
6,再创建一个UserController控制器类来处理HTTP请求:
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;import java.util.List;
import java.util.Optional;@RestController
@RequestMapping("/users")
public class UserController {@Autowiredprivate UserService userService;@PostMappingpublic User addUser(@RequestBody User user) {return userService.saveUser(user);}@GetMapping("/{id}")public Optional<User> getUserById(@PathVariable("id") String id) {return userService.getUserById(id);}@GetMappingpublic List<User> getAllUsers() {return userService.getAllUsers();}@DeleteMapping("/{id}")public void deleteUserById(@PathVariable("id") String id) {userService.deleteUserById(id);}
}
7,创建一个启动类SpringBootDemoApplication:
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;@SpringBootApplication
public class SpringBootDemoApplication {public static void main(String[] args) {SpringApplication.run(SpringBootDemoApplication.class, args);}
}
一个简单例子,欢迎拍砖讨论...