mapper层编写完了，下面继续编写service层和controller层的代码。

service：        示例中没有调用所有的数据接口。

package com.example.demo.service;import com.example.demo.bean.OrderInfo;import com.example.demo.mapper.OrderMapper;import com.github.pagehelper.PageHelper;import com.github.pagehelper.PageInfo;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.List;@Servicepublic class OrderService {    @Autowired    OrderMapper orderMapper;    public PageInfo
      
        getAllOrders(int page, int pageSize){        PageHelper.startPage(page, pageSize);        List
       
         list = orderMapper.selectAllOrders();        PageInfo
        
          pageInfo = new PageInfo<>(list);        return pageInfo;    }    public OrderInfo getOrderByID(int id){        return orderMapper.selectByPrimaryKey(id);    }    public int updateOrder(OrderInfo orderInfo) {        return orderMapper.update(orderInfo);    }    public int deleteOrder(int id){        return orderMapper.deleteByPrimaryKey(id);    }    public PageInfo
         
           getOrderByUserId(int uid,int page,int pageSize){        PageHelper.startPage(page, pageSize);        List
          
            list = orderMapper.selectByUserID(uid);        PageInfo
           
             pageInfo = new PageInfo<>(list); return pageInfo; } public int updateOrderStatus(OrderInfo orderInfo){ return orderMapper.updateStatus(orderInfo); }}
           
          
         
        
       
      

controller：

1 package com.example.demo.controller; 2  3 import com.example.demo.bean.OrderInfo; 4 import com.example.demo.service.OrderService; 5 import com.github.pagehelper.PageInfo; 6 import org.springframework.beans.factory.annotation.Autowired; 7 import org.springframework.web.bind.annotation.*; 8 import org.springframework.web.multipart.MultipartFile; 9 10 import java.io.File;11 import java.io.IOException;12 import java.text.SimpleDateFormat;13 import java.util.Date;14 import java.util.UUID;15 16 @RestController17 @RequestMapping("/order")18 public class BasicOrderController {19     @Autowired20     OrderService orderService;21 22     @RequestMapping(value = "/all", method = RequestMethod.GET)23     public PageInfo
      
        getAllOrders(@RequestParam(value = "page", defaultValue = "1") int page,24                                             @RequestParam(value = "pageSize", defaultValue = "8") int pageSize)  {25         return orderService.getAllOrders(page, pageSize);26     }27 28     @RequestMapping(value = "/detail/{id}", method = RequestMethod.GET)29     public OrderInfo getOrderByID(@PathVariable(value = "id", required = true) int id) {30         return orderService.getOrderByID(id);31     }32 33     @RequestMapping(value = "/user/{uid}", method = RequestMethod.GET)34     public PageInfo
       
         getOrderByUserID(@PathVariable(value = "uid", required = true) int uid,35                                                 @RequestParam(value = "page", defaultValue = "1") int page,36                                                 @RequestParam(value = "pageSize", defaultValue = "10") int pageSize) {37         return orderService.getOrderByUserId(uid, page, pageSize);38     }39 40 }
       
      

在浏览器中输入编写的接口地址：http://localhost:8080/order/all   可见其能正确返回数据。