SpringBoot 整合 MongoDB 实现数据的增删改查！

在Spring Boot中整合MongoDB实现数据的增删改查，你需要做以下几个步骤：

1. 添加Maven依赖
2. 配置MongoDB连接
3. 创建实体类
4. 创建MongoDB仓库接口
5. 创建服务层
6. 创建控制器

以下是一个简单的示例：

pom.xml依赖添加

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

application.properties配置

spring.data.mongodb.uri=mongodb://username:password@localhost:27017/your_database

实体类User.java

import org.springframework.data.annotation.Id;
import org.springframework.data.mongodb.core.mapping.Document;
 
@Document
public class User {
    @Id
    private String id;
    private String name;
    private int age;
 
    // 省略getter和setter方法
}

MongoDB仓库接口UserRepository.java

import org.springframework.data.mongodb.repository.MongoRepository;
 
public interface UserRepository extends MongoRepository<User, String> {
    // 这里可以添加自定义查询方法
}

UserService.java服务层

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
 
import java.util.List;
import java.util.Optional;
 
@Service
public class UserService {
    @Autowired
    private UserRepository userRepository;
 
    public List<User> findAll() {
        return userRepository.findAll();
    }
 
    public Optional<User> findById(String id) {
        return userRepository.findById(id);
    }
 
    public User save(User user) {
        return userRepository.save(user);
    }
 
    public void deleteById(String id) {
        userRepository.deleteById(id);
    }
}

UserController.java控制器

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 {
    @Autowired
    private UserService userService;
 
    @GetMapping
    public List<User> getAllUsers() {
        return userService.findAll();
    }
 
    @GetMapping("/{id}")
    public Optional<User> getUserById(@PathVariable String id) {
        return userService.findById(id);
    }
 
    @PostMapping
    public User createUser(@RequestBody User user) {
        return userService.save(user);
    }
 
    @DeleteMapping("/{id}")
    public void deleteUser(@PathVariable String id) {
        userService