封裝了一個科室管理的增刪改查介面：

科室列表、科室詳情、新增科室、修改科室、刪除科室

service層：

package com.yutangzongcai.demo.service;

import com.alibaba.fastjson.JSONObject;
import com.yutangzongcai.demo.entity.DepartmentEntity;
import com.yutangzongcai.demo.mapper.DepartmentMapper;
import com.yutangzongcai.demo.tool.Page;
import com.yutangzongcai.demo.tool.Res;
 
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.validation.annotation.Validated;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
 
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("department")
public class DepartmentService {

    @Autowired
    private DepartmentMapper departmentMapper;

    @PostMapping("list")
    public
 
 JSONObject list(@RequestBody JSONObject jsonObject) {
        return Res.list(departmentMapper.count(jsonObject), departmentMapper.list(Page.service(jsonObject)));
    }

    @PostMapping("detail")
    @Transactional(rollbackFor = Exception.class)
    public JSONObject detail(@Validated(value = {DepartmentEntity.Detail.class}) @RequestBody DepartmentEntity departmentEntity) {
        return Res.detail(departmentMapper.detail((JSONObject) JSONObject.toJSON(departmentEntity)));
    }

    @PostMapping("create")
    @Transactional(rollbackFor = Exception.class)
    public JSONObject create(@Validated(value = {DepartmentEntity.Create.class}) @RequestBody DepartmentEntity departmentEntity) {
        return Res.row(departmentMapper.create((JSONObject) JSONObject.toJSON(departmentEntity)), "新增");
    }

    @PostMapping("update")
    @Transactional(rollbackFor = Exception.class)
    public JSONObject update(@Validated(value = {DepartmentEntity.Update.class}) @RequestBody DepartmentEntity departmentEntity) {
        return Res.row(departmentMapper.update((JSONObject) JSONObject.toJSON(departmentEntity)), "修改");
    }

    @PostMapping("delete")
    @Transactional(rollbackFor = Exception.class)
    public JSONObject delete(@Validated(value = {DepartmentEntity.Detail.class}) @RequestBody DepartmentEntity departmentEntity) {
        return Res.row(departmentMapper.delete((JSONObject) JSONObject.toJSON(departmentEntity)), "刪除");
    }

}

dto層、entity層、mapper層、可根據需求自行定義