SpringBoot+Vue+Echarts实现选择时间范围内数据加载显示柱状图

场景

若依前后端分离版本地搭建开发环境并运行项目的教程：

https://blog.csdn.net/BADAO_LIUMANG_QIZHI/article/details/108465662

在上面搭建架构的基础上，实现使用ElementUI的el-date-picker选择一段时间范围，

统计后台数据库中对应时间内的记录数并在柱状图中显示。

注：

博客：
https://blog.csdn.net/badao_liumang_qizhi
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实现

1、后台设计数据库，新建带时间字段的表

DROP TABLE IF EXISTS `bus_blog`;
CREATE TABLE `bus_blog`  (
  `id` int(0) NOT NULL AUTO_INCREMENT COMMENT 'id',
  `add_time` datetime(0) NOT NULL COMMENT '添加时间',
  `blog_name` varchar(255) CHARACTER SET utf8 COLLATE utf8_general_ci NULL DEFAULT NULL COMMENT '名称',
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB CHARACTER SET = utf8 COLLATE = utf8_general_ci COMMENT = '博客表' ROW_FORMAT = Dynamic;

SET FOREIGN_KEY_CHECKS = 1;

然后表中添加几条带时间的数据

2、使用若依自带的代码生成工具生成前后端代码和菜单数据。

在实体类中添加开始时间和结束时间两个字段，用来接收和传递时间范围字段

package com.ruoyi.system.domain;

import java.util.Date;
import com.fasterxml.jackson.annotation.JsonFormat;
import org.apache.commons.lang3.builder.ToStringBuilder;
import org.apache.commons.lang3.builder.ToStringStyle;
import com.ruoyi.common.annotation.Excel;
import com.ruoyi.common.core.domain.BaseEntity;

/**
 * 博客对象 bus_blog
 *
 * @author ruoyi
 * @date 2021-11-25
 */
public class BusBlog extends BaseEntity
{
    private static final long serialVersionUID = 1L;

    /** id */
    private Long id;

    /** 添加时间 */
    @JsonFormat(pattern = "yyyy-MM-dd")
    @Excel(name = "添加时间", width = 30, dateFormat = "yyyy-MM-dd")
    private Date addTime;

    /** 名称 */
    @Excel(name = "名称")
    private String blogName;

    //开始时间
    private String beginDate;

    //结束时间
    private String endDate;

    public String getBeginDate() {
        return beginDate;
    }

    public void setBeginDate(String beginDate) {
        this.beginDate = beginDate;
    }

    public String getEndDate() {
        return endDate;
    }

    public void setEndDate(String endDate) {
        this.endDate = endDate;
    }

    public void setId(Long id)
    {
        this.id = id;
    }

    public Long getId()
    {
        return id;
    }
    public void setAddTime(Date addTime)
    {
        this.addTime = addTime;
    }

    public Date getAddTime()
    {
        return addTime;
    }
    public void setBlogName(String blogName)
    {
        this.blogName = blogName;
    }

    public String getBlogName()
    {
        return blogName;
    }

    @Override
    public String toString() {
        return new ToStringBuilder(this,ToStringStyle.MULTI_LINE_STYLE)
            .append("id", getId())
            .append("addTime", getAddTime())
            .append("blogName", getBlogName())
            .toString();
    }
}

3、修改Controller层的获取数据的接口

    @GetMapping("/list")
    public AjaxResult list(BusBlog busBlog)
    {
        BusBlog indexModel=new BusBlog();
        //构造返回数据，注意这里需要用LinkedHashMap
        Map<String,Integer> resultMap = new LinkedHashMap<String,Integer>();
        if(null!= busBlog.getBeginDate() && null!= busBlog.getEndDate()) {
            //获取请求参数，开始时间和结束时间
            indexModel.setBeginDate(busBlog.getBeginDate());
            indexModel.setEndDate(busBlog.getBeginDate());
            List<String> rangeData = new ArrayList<String>();
            //查询数据库获取指定时间内的数据
            rangeData = busBlogService.selectBlogCountByDate(busBlog);
            if (rangeData.size() >= 0) {
                // 日期格式化
                SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd");
                try {
                    // 起始日期
                    Date d1 = sdf.parse(busBlog.getBeginDate());
                    // 结束日期
                    Date d2 = sdf.parse(busBlog.getEndDate());
                    Date tmp = d1;
                    Calendar dd = Calendar.getInstance();
                    dd.setTime(d1);
                    while (tmp.getTime() < d2.getTime()) {
                        int dayCount = 0;
                        tmp = dd.getTime();
                        //获取查询的数据每天的档案数量
                        for (String oneDay:rangeData) {
                            Date oneDayDate = sdf.parse(oneDay);
                            if(oneDayDate.toString().equals(tmp.toString()))
                            {
                                dayCount++;
                            }
                        }
                        resultMap.put(sdf.format(tmp),dayCount);
                        // 天数加上1
                        dd.add(Calendar.DAY_OF_MONTH, 1);
                    }
                    System.out.println(resultMap);
                } catch (ParseException e) {
                    e.printStackTrace();
                }
            }
        }
        return AjaxResult.success(resultMap);
    }

4、Service层和mapper略过

都是如下返回格式和请求数据格式

public List<String> selectBlogCountByDate(BusBlog queryParam);

5、mapper.xml具体查询sql实现

    <select id="selectBlogCountByDate" parameterType="BusBlog" resultType="java.lang.String">
        SELECT
            add_time
        FROM
        bus_blog
        <where>
            <if test="beginDate != null">
                AND date_format(add_time,'%y%m%d') >=  date_format(#{beginDate},'%y%m%d')
            </if>
            <if test="endDate != null">
                AND date_format(#{endDate},'%y%m%d')  >=  date_format(add_time,'%y%m%d')
            </if>
        </where>

6、最终后台返回的数据格式为

7、前端新建一个组件BarChartDateRange.vue用来显示柱状图

组件代码：

<template>
  <div :style="{ height: '300px',  '300px' }" />
</template>

<script>
import echarts from "echarts";
require("echarts/theme/macarons"); // echarts theme
import request from '@/utils/request'
import { formatDate } from "@/utils/index";

export default {
  name: "BarChartDateRange",
  data() {
    return {
      chart: null,
      typeData: [
        { product: "2021.11.23", 博客数: 20 },
        { product: "2021.11.24", 博客数: 30 },
        { product: "2021.11.25", 博客数: 35 },
        { product: "2021.11.26", 博客数: 43 },
      ],
      yAxisMax: 0,
      queryParam: {
        beginDate: null,
        endDate: null,
      },
    };
  },
  created() {
    //默认开始时间为一周前
    this.queryParam.beginDate = formatDate(
      new Date().getTime() - 60 * 1000 * 60 * 24 * 6
    );
    //默认结束时间时间当前时间
    this.queryParam.endDate = formatDate(new Date().getTime());
    this.getList().then((response) => {
      var res = response.data;
      if (res) {
        //清空柱状图的数据源
        this.typeData = [];
        //遍历后台响应数据，构造柱状图数据源
        for (var key in res) {
          this.typeData.push({ product: key, 博客数: res[key] });
        }
      }
      this.initChart(this.typeData);
    });
  },
  mounted() {},
  methods: {
    //调用后台接口查询数据
    getList() {
      return request({
        url: "/system/blog/list",
        method: "get",
        params: this.queryParam,
      });
    },
    //父组件调用子组件的该方法进行重新渲染柱状图
    getSelectedRangeList(range) {
      var startDate = range[0];
      var endDate = range[1];
      this.queryParam.beginDate = startDate;
      this.queryParam.endDate = endDate;
      this.getList().then((response) => {
        var res = response.data;
        if (res) {
          this.typeData = [];
          for (var key in res) {
            this.typeData.push({ product: key, 博客数: res[key] });
          }
        }
        this.initChart(this.typeData);
      });
    },
    initChart(typeData) {
      this.chart = echarts.init(this.$el, "macarons");
      this.chart.setOption({
        tooltip: {
          trigger: "axis",
          axisPointer: {
            // 坐标轴指示器，坐标轴触发有效
            type: "shadow", // 默认为直线，可选为：'line' | 'shadow'
          },
        },
        grid: {
          top: 10,
          left: "2%",
          right: "2%",
          bottom: "3%",
          containLabel: true,
        },
        legend: {
          //图例
          data: ["博客数"],
        },
        xAxis: [
          {
            type: "category",
            axisPointer: {
              type: "shadow",
            },
            axisLabel: {
              interval: 0,
              rotate: 40,
            },
          },
        ],
        yAxis: [
          {
            type: "value",
            name: "单位：(条)",
            min: 0,
            max: 30,
            interval: 10,
            axisLabel: {
              formatter: "{value}",
            },
          },
        ],
        dataset: {
          source: typeData,
        },
        series: [
          {
            name: "博客数",
            type: "bar",
            barWidth: "40%",
          },
        ],
      });
    },
  },
};
</script>

8、然后在主页面中引入该组件

import BarChartDateRange from "@/components/Echarts/BarChartDateRange";

export default {
  name: "Blog",
  components: {
    BarChartDateRange,
  },

并且在主页面添加时间范围选择组件

  <div>
    <div>
      <BarChartDateRange ref="BarChartDateRange"></BarChartDateRange>
    </div>
    <div class="block">
      <el-date-picker
        size="large"
        type="daterange"
        v-model="value1"
        range-separator="至"
        start-placeholder="开始日期"
        end-placeholder="结束日期"
        @change="dateSelectChange"
        :value-format="dateFormat"
      >
      </el-date-picker>
    </div>
  </div>

设置时间选择组件的改变事件

@change="dateSelectChange"

实现该方法

    /** 查询博客列表 */
      dateSelectChange(val) {
      if (val) {
        var startDate = new Date(val[0]).getTime();
        var endDate = new Date(val[1]).getTime();
        debugger;
        if (endDate - startDate > 6 * 24 * 60 * 60 * 1000) {
          this.$message({
            message: "所选时间范围不能大于7天",
            type: "warning",
          });
        }else{
           this.$refs.BarChartDateRange.getSelectedRangeList(val);
        }
      }
    },

获取选择的时间进行范围校验，然后通过

 this.$refs.BarChartDateRange.getSelectedRangeList(val);

调用子组件的方法重新查询数据并渲染柱状图

子组件需要声明ref

<BarChartDateRange ref="BarChartDateRange"></BarChartDateRange>

在子组件中方法实现

    //父组件调用子组件的该方法进行重新渲染柱状图
    getSelectedRangeList(range) {
      var startDate = range[0];
      var endDate = range[1];
      this.queryParam.beginDate = startDate;
      this.queryParam.endDate = endDate;
      this.getList().then((response) => {
        var res = response.data;
        if (res) {
          this.typeData = [];
          for (var key in res) {
            this.typeData.push({ product: key, 博客数: res[key] });
          }
        }
        this.initChart(this.typeData);
      });
    },

9、柱状图组件完整示例代码

<template>
  <div :style="{ height: '300px',  '300px' }" />
</template>

<script>
import echarts from "echarts";
require("echarts/theme/macarons"); // echarts theme
import request from '@/utils/request'
import { formatDate } from "@/utils/index";

export default {
  name: "BarChartDateRange",
  data() {
    return {
      chart: null,
      typeData: [
        { product: "2021.11.23", 博客数: 20 },
        { product: "2021.11.24", 博客数: 30 },
        { product: "2021.11.25", 博客数: 35 },
        { product: "2021.11.26", 博客数: 43 },
      ],
      yAxisMax: 0,
      queryParam: {
        beginDate: null,
        endDate: null,
      },
    };
  },
  created() {
    //默认开始时间为一周前
    this.queryParam.beginDate = formatDate(
      new Date().getTime() - 60 * 1000 * 60 * 24 * 6
    );
    //默认结束时间时间当前时间
    this.queryParam.endDate = formatDate(new Date().getTime());
    this.getList().then((response) => {
      var res = response.data;
      if (res) {
        //清空柱状图的数据源
        this.typeData = [];
        //遍历后台响应数据，构造柱状图数据源
        for (var key in res) {
          this.typeData.push({ product: key, 博客数: res[key] });
        }
      }
      this.initChart(this.typeData);
    });
  },
  mounted() {},
  methods: {
    //调用后台接口查询数据
    getList() {
      return request({
        url: "/system/blog/list",
        method: "get",
        params: this.queryParam,
      });
    },
    //父组件调用子组件的该方法进行重新渲染柱状图
    getSelectedRangeList(range) {
      var startDate = range[0];
      var endDate = range[1];
      this.queryParam.beginDate = startDate;
      this.queryParam.endDate = endDate;
      this.getList().then((response) => {
        var res = response.data;
        if (res) {
          this.typeData = [];
          for (var key in res) {
            this.typeData.push({ product: key, 博客数: res[key] });
          }
        }
        this.initChart(this.typeData);
      });
    },
    initChart(typeData) {
      this.chart = echarts.init(this.$el, "macarons");
      this.chart.setOption({
        tooltip: {
          trigger: "axis",
          axisPointer: {
            // 坐标轴指示器，坐标轴触发有效
            type: "shadow", // 默认为直线，可选为：'line' | 'shadow'
          },
        },
        grid: {
          top: 10,
          left: "2%",
          right: "2%",
          bottom: "3%",
          containLabel: true,
        },
        legend: {
          //图例
          data: ["博客数"],
        },
        xAxis: [
          {
            type: "category",
            axisPointer: {
              type: "shadow",
            },
            axisLabel: {
              interval: 0,
              rotate: 40,
            },
          },
        ],
        yAxis: [
          {
            type: "value",
            name: "单位：(条)",
            min: 0,
            max: 30,
            interval: 10,
            axisLabel: {
              formatter: "{value}",
            },
          },
        ],
        dataset: {
          source: typeData,
        },
        series: [
          {
            name: "博客数",
            type: "bar",
            barWidth: "40%",
          },
        ],
      });
    },
  },
};
</script>

10、显示柱状图的父组件完整示例代码

<template>
  <div>
    <div>
      <BarChartDateRange ref="BarChartDateRange"></BarChartDateRange>
    </div>
    <div class="block">
      <el-date-picker
        size="large"
        type="daterange"
        v-model="value1"
        range-separator="至"
        start-placeholder="开始日期"
        end-placeholder="结束日期"
        @change="dateSelectChange"
        :value-format="dateFormat"
      >
      </el-date-picker>
    </div>
  </div>
</template>
<script>
import BarChartDateRange from "@/components/Echarts/BarChartDateRange";

export default {
  name: "Blog",
  components: {
    BarChartDateRange,
  },
  data() {
    return {
      value1: "",
      dateFormat: "yyyy-MM-dd",
    };
  },
  created() {
  },
  methods: {
    /** 查询博客列表 */
      dateSelectChange(val) {
      if (val) {
        var startDate = new Date(val[0]).getTime();
        var endDate = new Date(val[1]).getTime();
        debugger;
        if (endDate - startDate > 6 * 24 * 60 * 60 * 1000) {
          this.$message({
            message: "所选时间范围不能大于7天",
            type: "warning",
          });
        }else{
           this.$refs.BarChartDateRange.getSelectedRangeList(val);
        }
      }
    },
  },
};
</script>