Spring Boot +ECharts案例演示

一、提出任务

• 班级数据

二、完成任务

（一）创建数据库与表

1、创建数据库

• 创建数据库 - bootdb

CREATE DATABASE bootdb;

• 执行上述命令

2、创建数据表

• 创建表结构 - t_class

SELECT * FROM t_score ts
   WHERE (SELECT COUNT(*) FROM t_score  
	           WHERE ts.name = t_score.name 
						    AND score >= ts.score						 		
	        ) <= 3 ORDER BY name, score DESC;   

• 执行上述命令

• 插入表记录

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

• 执行上述语句

• 查看班级表记录

（二）创建Spring Boot项目

• 利用Spring Initializr创建Spring Boot项目 - EChartsDemo

• 填写信息

• 添加依赖

• 设置项目名称与保存位置

• 单击【Finish】按钮

（三）创建班级实体类

• 在net.huawei.echarts包里创建bean子包，在子包里创建Clazz类

`package net.fhl.echarts.bean;

//班级实体类

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 "Clazz{" +
            "id=" + id +
            ", clazz='" + clazz + '\'' +
            ", boys=" + boys +
            ", girls=" + girls +
            '}';
}
}

（四）创建班级映射器接口

• 在net.huawei.echarts包里创建mapper子包，在子包里创建ClazzMapper接口

package net.fhl.echarts.mapper;

import net.fhl.echarts.bean.Clazz;
import org.apache.ibatis.annotations.Mapper;

import java.util.List;


 //功能：班级映射器接口

@Mapper
public interface ClazzMapper {
    List<Clazz> findAll();
}

（五）创建班级映射器配置文件

• 在resources里创建mapper目录，在里面创建ClazzMapper.xml

<?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.fhl.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.fhl.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>

（六）创建班级服务类

• 在net.huawei.echarts包里创建service子包，在子包里创建ClazzService类

package net.fhl.echarts.service;

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

import java.util.List;

//功能：班级服务类

@Service
public class ClazzService {
    @Autowired(required = false)
    private ClazzMapper clazzMapper;

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

（七）创建班级控制器

• 在net.huawei.echarts包里创建controller子包，在子包里创建ClazzController类

package net.fhl.echarts.controller;

import net.fhl.echarts.bean.Clazz;
import net.fhl.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;

//班级控制器

@Controller
public class ClazzController {
    @Autowired
    private ClazzService clazzService;

    @GetMapping("/")
    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;
    }
}

• （八）添加ECharts和jQuery脚本
• 在static里创建js目录，添加echarts.min.js与jquery.min.js

（九）添加Druid起步依赖

• 在pom.xml文件里添加Druid针对Spring Boot的起步依赖

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.7.0</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>net.fhl.echarts</groupId>
    <artifactId>echartsdemo</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>echartsdemo</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.mybatis.spring.boot</groupId>
            <artifactId>mybatis-spring-boot-starter</artifactId>
            <version>2.2.2</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>com.alibaba</groupId>
            <artifactId>druid-spring-boot-starter</artifactId>
            <version>1.2.11</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

<dependency>
     <groupId>com.alibaba</groupId>
     <artifactId>druid-spring-boot-starter</artifactId>
     <version>1.2.11</version>
</dependency>

（十）修改应用属性文件

• 将application.properties更名为application.yaml
  

spring:
datasource:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/bootdb?serverTimezone=UTC&useUnicode=true&characterEncoding=UTF-8
username: root
password: 123456

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.fhl.echarts.bean

server:
port: 8888

（十一）创建页面可视化数据

• 在templates目录里创建index.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>20级各班人数柱状图</title>
    <script src="js/echarts.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: "20级各班人数柱状图",
                    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>

（十二）启动应用，查看结果

• 启动应用（端口号：8888）、访问http://localhost:8888

• 单击【显示柱状图】按钮