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需求分析

营业额指订单状态为已完成的订单金额合计

基于可视化报表的折线图展示营业额数据，X 轴为日期，Y 轴为营业额

根据时间选择区间，展示每天的营业额数据

注意事项

具体返回数据一般由前端来决定，前端展示图表，具体折现图对应数据是什么格式，是有固定的要求的，所以说，后端需要去适应前端，它需要什么格式的数据，我们就给它返回什么格式的数据

Controller 层

ReportController

package com.sky.controller.admin;

import com.sky.result.Result;
import com.sky.service.ReportService;
import com.sky.vo.TurnoverReportVO;
import io.swagger.annotations.Api;
import io.swagger.annotations.ApiOperation;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.format.annotation.DateTimeFormat;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import java.time.LocalDate;

/**
 * 报表
 */
@RestController
@RequestMapping("/admin/report")
@Slf4j
@Api(tags = "统计报表相关接口")
public class ReportController {

    @Autowired
    private ReportService reportService;

    /**
     * 营业额数据统计
     *
     * @param begin
     * @param end
     * @return
     */
    @GetMapping("/turnoverStatistics")
    @ApiOperation("营业额数据统计")
    public Result<TurnoverReportVO> turnoverStatistics(
            @DateTimeFormat(pattern = "yyyy-MM-dd")
                    LocalDate begin,
            @DateTimeFormat(pattern = "yyyy-MM-dd")
                    LocalDate end) {
        return Result.success(reportService.getTurnover(begin, end));
    }

}

Service 层

ReportService

创建 ReportService 接口，声明 getTurnover 方法

package com.sky.service;

import com.sky.vo.TurnoverReportVO;
import java.time.LocalDate;

public interface ReportService {

    /**
     * 根据时间区间统计营业额
     * @param beginTime
     * @param endTime
     * @return
     */
    TurnoverReportVO getTurnover(LocalDate beginTime, LocalDate endTime);
}

ReportServiceImpl

创建 ReportServiceImpl 实现类，实现 getTurnover 方法

package com.sky.service.impl;

import com.sky.entity.Orders;
import com.sky.mapper.OrderMapper;
import com.sky.service.ReportService;
import com.sky.vo.TurnoverReportVO;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private OrderMapper orderMapper;

    /**
     * 根据时间区间统计营业额
     * @param begin
     * @param end
     * @return
     */
    public TurnoverReportVO getTurnover(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)){
            begin = begin.plusDays(1);//日期计算，获得指定日期后1天的日期
            dateList.add(begin);
        }

       List<Double> turnoverList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            Map map = new HashMap();
        	map.put("status", Orders.COMPLETED);
        	map.put("begin",beginTime);
        	map.put("end", endTime);
            Double turnover = orderMapper.sumByMap(map);
            turnover = turnover == null ? 0.0 : turnover;
            turnoverList.add(turnover);
        }

        //数据封装
        return TurnoverReportVO.builder()
                .dateList(StringUtils.join(dateList,","))
                .turnoverList(StringUtils.join(turnoverList,","))
                .build();
    }
}

Mapper 层

OrderMapper

在 OrderMapper 接口声明 sumByMap 方法

/**
 * 根据动态条件统计营业额
 * @param map
 */
Double sumByMap(Map map);

OrderMapper.xml

在 OrderMapper.xml 文件中编写动态 SQL

<select id="sumByMap" resultType="java.lang.Double">
        select sum(amount) from orders
        <where>
            <if test="status != null">
                and status = #{status}
            </if>
            <if test="begin != null">
                and order_time &gt;= #{begin}
            </if>
            <if test="end != null">
                and order_time &lt;= #{end}
            </if>
        </where>
</select>