第一步：创建项目

第二步：给mongodb插入数据

第三步：创建实体类

package org.cyl.test02.entity;// Task.java
import lombok.Data;

@Data
public class Task {
    private String id;
    private String description;
}

第四步：创建Repository

引入依赖

 <!-- Spring Data MongoDB -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
        </dependency>

创建TaskRepository接口

package org.cyl.test02.repository;// TaskRepository.java
import org.cyl.test02.entity.Task;
import org.springframework.data.repository.reactive.ReactiveCrudRepository;

public interface TaskRepository extends ReactiveCrudRepository<Task, String> {

}

第五步：创建Controller

package org.cyl.test02.controller;// TaskController.java
import org.cyl.test02.entity.Task;
import org.cyl.test02.repository.TaskRepository;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

@RestController
@RequestMapping("/tasks")
public class TaskController {

    @Autowired
    private TaskRepository taskRepository;

    @GetMapping
    public Flux<Task> getAllTasks() {
        return taskRepository.findAll();
    }

    @GetMapping("/{id}")
    public Mono<Task> getTaskById(@PathVariable String id) {
        return taskRepository.findById(id);
    }

    @PostMapping
    public Mono<Task> createTask(@RequestBody Task task) {
        return taskRepository.save(task);
    }

    @PutMapping("/{id}")
    public Mono<Task> updateTask(@PathVariable String id, @RequestBody Task task) {
        task.setId(id);
        return taskRepository.save(task);
    }

    @DeleteMapping("/{id}")
    public Mono<Void> deleteTask(@PathVariable String id) {
        return taskRepository.deleteById(id);
    }
}

第六步：配置yml文件

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

运行结果