可视化数据

Posted 2022-01-30 qq_48838980

一、数据库

1、创建数据库

2、创建表

CREATE TABLE `t_class`  (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `class` varchar(50) CHARACTER SET utf8 COLLATE utf8_general_ci DEFAULT NULL,
  `boys` int(11) DEFAULT NULL,
  `girls` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`) USING BTREE
) ENGINE = InnoDB AUTO_INCREMENT = 5 CHARACTER SET = utf8 COLLATE = utf8_general_ci ROW_FORMAT = Compact;

3、插入记录

INSERT INTO `t_class` VALUES (1, '19软件1班', 26, 18);
INSERT INTO `t_class` VALUES (2, '19软件2班', 17, 20);
INSERT INTO `t_class` VALUES (3, '19大数据1班', 24, 30);
INSERT INTO `t_class` VALUES (4, '19计应1班', 21, 24);

二、项目实现

1、创建项目

2、配置依赖

3、班级实体类

package net.zjs.echarts.bean;

/**
 * 功能：
 * 作者：zjs
 * 日期：2021-06-29
 */
public class Clazz 
    private int id;
    private String clazz;
    private int boys;
    private int girls;

    public int getId() 
        return id;
    

    public void setId(int id) 
        this.id = id;
    

    public String getClazz() 
        return clazz;
    

    public void setClazz(String clazz) 
        this.clazz = clazz;
    

    public int getBoys() 
        return boys;
    

    public void setBoys(int boys) 
        this.boys = boys;
    

    public int getGirls() 
        return girls;
    

    public void setGirls(int girls) 
        this.girls = girls;
    

    @Override
    public String toString() 
        return "Class" +
                "id=" + id +
                ", clazz='" + clazz + '\\'' +
                ", boys=" + boys +
                ", girls=" + girls +
                '';
    

4、班级映射器接口

5、班级映射器配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper
        PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
        "http://mybatis.org/dtd/mybatis-3-mapper.dtd">

<mapper namespace="net.hw.echarts.mapper.ClazzMapper">
    <!--定义结果映射，因为表字段名与实体属性名不完全一致-->
    <resultMap id="clazzMap" type="net.hw.echarts.bean.Clazz">
        <result property="id" column="id"/>
        <result property="clazz" column="class"/>
        <result property="boys" column="boys"/>
        <result property="girls" column="girls"/>
    </resultMap>

    <select id="findAll" resultMap="clazzMap">
        SELECT * FROM t_class;
    </select>
</mapper>

6、班级服务类

package net.zjs.echarts.service;

import net.zjs.echarts.bean.Clazz;
import net.zjs.echarts.mapper.ClazzMapper;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * 功能：
 * 作者：zjs
 * 日期：2021-06-29
 */
@Service
public class ClazzService 

    @Autowired(required = false)
    private ClazzMapper clazzMapper;

    public List<Clazz> findAll()
        return clazzMapper.findAll();
    

7、班级控制器

package net.zjs.echarts.controller;

import net.zjs.echarts.bean.Clazz;
import net.zjs.echarts.service.ClazzService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;

/**
 * 功能：
 * 作者：zjs
 * 日期：2021-06-29
 */
@Controller
public class ClazzController 
    @Autowired
    private ClazzService clazzService;

    @GetMapping("/index")
    public String index() 
        return "index";
    

    @RequestMapping(value = "/getAll", produces = "application/json; charset=utf-8")
    @ResponseBody
    public List<Clazz> getAll() 
        List<Clazz> clazzes = clazzService.findAll();
        return clazzes;
    

8、添加ECharts和jQuery

9、添加Druid依赖

 <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.6</version>
        </dependency>

10、配置数据源与MyBatis

spring:
  datasource:
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/text?serverTimezone=UTC&useUnicode=true&characterEncoding=UTF-8
    username: root
    password: 12465

    type: com.alibaba.druid.pool.DruidDataSource
    druid:
      initial-size: 20
      max-active: 100
      min-idle: 10
mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: net.zjs.echarts.bean

11、编写数据显示页面

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>19级各班人数柱状图</title>
    <script src="js/jquery.min.js"></script>
    <script src="js/echarts.min.js"></script>
    <style>
        .box 
            width: 600px;
            height: 400px;
            border: 1px solid cornflowerblue;
        
    </style>
</head>
<body>
<input type="button" value="显示柱状图" class="btnShowBar"/>
<hr/>
<div class="box"></div>
<script>
    // 获取box元素
    var box = document.getElementsByClassName("box")[0];
    // 获取btnShowBar元素
    var btnShowBar = document.getElementsByClassName("btnShowBar")[0];
    // 定义按钮单击事件
    btnShowBar.onclick = function () 
        // 获取后台返回的JSON数据
        $.get('/getAll', function (data) 
            // 定义三个数组
            class_list = [];
            boy_list = [];
            girl_list = [];

            // 将json数据写入数组
            for (var i = 0; i < data.length; i++) 
                class_list.push(data[i].clazz);
                boy_list.push(data[i].boys);
                girl_list.push(data[i].girls);
            

            // 1. 初始化ECharts
            var my_box = echarts.init(box);

            // 2. 进行参数配置
            var option = 
                // 标题
                title: 
                    text: "19级各班人数条形图",
                    x: "center",
                    y: "top",
                    textAlign: "left",
                    textStyle: 
                        fontFamily: "楷体",
                        fontSize: 35,
                        textStyle: "bold"
                    
                ,

                // 图例
                legend: 
                    left: "right",
                    orient: "vertical"
                ,

                // x轴数据
                xAxis: 
                    data: class_list
                ,

                // y轴数据
                yAxis: ,

                // 数据信息
                series: [
                    
                        name: "男生人数",
                        type: "bar",
                        data: boy_list,
                        itemStyle: 
                            normal: 
                                color: '#0000aa'
                            
                        
                    ,
                    
                        name: "女生人数",
                        type: "bar",
                        data: girl_list,
                        itemStyle: 
                            normal: 
                                color: '#aa0000'
                            
                        
                    
                ]
            

            // 3. 可视化呈现
            my_box.setOption(option);
        );
    
</script>
</body>
</html>

12、查看效果

• 访问：http://localhost:8080/index