Spring + ECharts实现数据可视化的案例详解
作者：早起之王
Apache ECharts是一个基于 JavaScript 的开源可视化图表库，在网页上实现数据的可视化，非常好用，本文将通过一个简单的demo来给大家介绍一下Spring + ECharts如何数据可视化,需要的朋友可以参考下
一、成果
做好的demo是这个样子的。
通过下拉框选择查询条件，点击按钮，调用后端接口查询数据，返回前端实现可视化。
二、数据准备
计划做一个学生成绩成绩数据的可视化，用到三张表：
学生表、课程表、成绩表，如下：
三、具体实现
通过上面的成果展示图可以看到，实现了两个需求：
1. 展示某年每个学生各科分数的柱状图
2. 展示近三年某个学生总分的折线图
某年每个学生各科分数的柱状图
后端
1. 按照年份查找所有学生所有科目的分数
2. 把数据处理成ECharts柱状图方便接收的形式，传给前端
3. 把所有年份数据（2021、2022、2023）查询出来，给前端做下拉框的部分
4. 查出学生姓名，给前端做柱状图x轴信息
前端
1. 下拉框选择年份
2. 导入ECharts柱状图，并且填充后端数据
后端代码
ResultJson 规范返回值
@Data
public class ResultJson {
private Integer code;
private String msg;
private Object data;
public ResultJson(Integer code, String msg, Object data) {
this.code = code;
this.msg = msg;
this.data = data;
}
public static ResultJson success(Object data){
return success("成功",data);
}
public static ResultJson success(String msg,Object data){
return new ResultJson(200,msg,data);
}
}实体类
@Data
@TableName("t_score")
public class Score {
@TableId(type = IdType.AUTO)
private Long id;
@TableField
private String sno;
private String cno;
private Integer score;
private String year;
}Controller层
@RestController
@RequestMapping("score")
public class ScoreController {
@Autowired
ScoreService scoreService;
@RequestMapping("listScore")
public ResultJson listScore(String year){
return ResultJson.success(scoreService.listScore(year));
}
@RequestMapping("listYears")
public ResultJson listYears(){
return ResultJson.success(scoreService.listYears());
}
}Service层
public interface ScoreService extends IService<Score> {
List<List<Object>> listScore(String year);
List<String> listYears();
}这里是认定了只有数学、英语、语文三门科目的，是写死的写法，可以写成灵活的形式，可以参考后面的需求2。
@Service
public class ScoreServiceImpl extends ServiceImpl<ScoreMapper, Score> implements ScoreService {
@Autowired
ScoreMapper scoreMapper;
@Override
public List<List<Object>> listScore(String year) {
List<StudentScore> studentScores = scoreMapper.listScore(year);
List<StudentScore> order = studentScores.stream().sorted(Comparator.comparing(StudentScore::getStudentName)
.thenComparing(StudentScore::getCourseName)).collect(Collectors.toList());
TreeMap<String, List<Integer>> treeMap = new TreeMap<>();
for(StudentScore studentScore : order){
String studentName = studentScore.getStudentName();
if(!treeMap.containsKey(studentName)){
treeMap.put(studentName,new ArrayList<>());
}
treeMap.get(studentName).add(studentScore.getScore());
}
List<List<Object>> lists = new ArrayList<>();
for(int i = 0; i < 4; i++){
lists.add(new ArrayList<>());
}
treeMap.forEach((key,value)->{
lists.get(0).add(key);
lists.get(1).add(value.get(0));
lists.get(2).add(value.get(1));
lists.get(3).add(value.get(2));
});
return lists;
}
@Override
public List<String> listYears() {
return scoreMapper.listYears();
}Mapper层
@Mapper
public interface ScoreMapper extends BaseMapper<Score> {
List<StudentScore> listScore(String year);
List<String> listYears();
}ScoreMapper.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">
<!--namespace => mapper接口 类的全限定名 -->
<mapper namespace="com.zqzw.echart.mapper.ScoreMapper">
<resultMap id="BaseResultMap" type="com.zqzw.echart.entity.StudentScore">
<id column="id" jdbcType="BIGINT" property="id"/>
<result column="student_name" jdbcType="VARCHAR" property="studentName"/>
<result column="course_name" jdbcType="VARCHAR" property="courseName"/>
<result column="score" jdbcType="INTEGER" property="score"/>
</resultMap>
<select id="listScore" resultMap="BaseResultMap">
select student_name,course_name,score from t_score sc
inner join t_student s on sc.sno = s.sno
inner join t_course c on sc.cno = c.cno
where year = #{year}
</select>
<select id="listYears" resultType="java.lang.String">
select distinct year from t_score order by year
</select>
</mapper>前端代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>ECharts-Demo</title>
</head>
<body>
<h1>成绩查询</h1>
<div id="main" style="width: 600px;height:400px;" ></div>
<select id="year" style = "width: 100px"></select>
<button id = "b1" onclick="list();">某年每个学生的各科分数</button>
</body>
</html>
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script src="
https://cdn.jsdelivr.net/npm/echarts@5.4.2/dist/echarts.min.js
"></script>
<script >
const myChart = echarts.init(document.getElementById('main'));
let option = {
xAxis: {
data: []
},
yAxis: {},
series: [
{
type: 'bar',
data: []
},
{
type: 'bar',
data: []
},
{
type: 'bar',
data: []
}
]
};
$(function () {
$.ajax({
url:"http://localhost:8080/score/listYears",
dataType:"json",
data:{},
type:"post",
success:function (res) {
var obj = document.getElementById("year");
obj.options.add(new Option(res.data[0],res.data[0],true));
for(var i = 1; i < res.data.length; i++){
obj.options.add(new Option(res.data[i],res.data[i]));
}
}
});
});
function list(){
var obj = document.getElementById("year");
var index = obj.selectedIndex;
if(index < 0){
index = 0;
}
var key = obj.options[index].value;
$.ajax({
url:"http://localhost:8080/score/listScore",
dataType:"json",
data:{"year": key},
type:"post",
success:function(res){
option.xAxis.data = res.data[0];
option.series[0].data = res.data[1];
option.series[1].data = res.data[2];
option.series[2].data = res.data[3];
myChart.clear();
myChart.setOption(option);
},
error:function(){
}
});
}
</script>近三年某个学生总分的折线图
后端
1. 按照学号查出每年的总分
2. 把数据处理成ECharts柱状图方便接收的形式，传给前端
3. 把所有学生姓名查询出来，给前端做下拉框的部分
4. 查出年份数据，给前端做柱状图x轴信息
前端
1. 下拉框显示学生姓名，实际值是学号
2. 导入ECharts折线图，并且填充后端数据
四、完整代码
后端代码
加上这个部分就是全部了，所以这里直接放出完整的代码了
ResultJson不变
实体类
@Data
@TableName("t_student")
public class Student {
@TableId(type = IdType.AUTO)
private Long id;
@TableField
private String sno;
@TableField("student_name")
private String studentName;
private Integer sex;
}@Data
public class TotalScore extends Score{
private Integer totalScore;
}Controller层
@RestController
@RequestMapping("score")
public class ScoreController {
@Autowired
ScoreService scoreService;
@RequestMapping("listScore")
public ResultJson listScore(String year){
return ResultJson.success(scoreService.listScore(year));
}
@RequestMapping("listYears")
public ResultJson listYears(){
return ResultJson.success(scoreService.listYears());
}
@RequestMapping("listTotal")
public ResultJson listTotal(String sno){
return ResultJson.success(scoreService.listTotal(sno));
}
@RequestMapping("listStudents")
public ResultJson listStudents(){
return ResultJson.success(scoreService.listStudents());
}
}Service层
public interface ScoreService extends IService<Score> {
List<List<Object>> listScore(String year);
List<String> listYears();
List<List<Object>> listTotal(String sno);
List<Student> listStudents();
}@Service
public class ScoreServiceImpl extends ServiceImpl<ScoreMapper, Score> implements ScoreService {
@Autowired
ScoreMapper scoreMapper;
@Override
public List<List<Object>> listScore(String year) {
List<StudentScore> studentScores = scoreMapper.listScore(year);
List<StudentScore> order = studentScores.stream().sorted(Comparator.comparing(StudentScore::getStudentName)
.thenComparing(StudentScore::getCourseName)).collect(Collectors.toList());
TreeMap<String, List<Integer>> treeMap = new TreeMap<>();
for(StudentScore studentScore : order){
String studentName = studentScore.getStudentName();
if(!treeMap.containsKey(studentName)){
treeMap.put(studentName,new ArrayList<>());
}
treeMap.get(studentName).add(studentScore.getScore());
}
List<List<Object>> lists = new ArrayList<>();
for(int i = 0; i < 4; i++){
lists.add(new ArrayList<>());
}
treeMap.forEach((key,value)->{
lists.get(0).add(key);
lists.get(1).add(value.get(0));
lists.get(2).add(value.get(1));
lists.get(3).add(value.get(2));
});
return lists;
}
@Override
public List<String> listYears() {
return scoreMapper.listYears();
}
@Override
public List<List<Object>> listTotal(String sno) {
List<TotalScore> totalScores = scoreMapper.listTotal(sno);
List<List<Object>> result = new ArrayList<>();
result.add(new ArrayList<>());
result.add(new ArrayList<>());
for(TotalScore t : totalScores){
result.get(0).add(t.getYear());
result.get(1).add(t.getTotalScore());
}
return result;
}
@Override
public List<Student> listStudents() {
return scoreMapper.listStudents();
}
}Mapper层
@Mapper
public interface ScoreMapper extends BaseMapper<Score> {
List<StudentScore> listScore(String year);
List<String> listYears();
List<TotalScore> listTotal(String sno);
List<Student> listStudents();
}ScoreMapper.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">
<!--namespace => mapper接口 类的全限定名 -->
<mapper namespace="com.zqzw.echart.mapper.ScoreMapper">
<resultMap id="BaseResultMap" type="com.zqzw.echart.entity.StudentScore">
<id column="id" jdbcType="BIGINT" property="id"/>
<result column="student_name" jdbcType="VARCHAR" property="studentName"/>
<result column="course_name" jdbcType="VARCHAR" property="courseName"/>
<result column="score" jdbcType="INTEGER" property="score"/>
</resultMap>
<select id="listScore" resultMap="BaseResultMap">
select student_name,course_name,score from t_score sc
inner join t_student s on sc.sno = s.sno
inner join t_course c on sc.cno = c.cno
where year = #{year}
</select>
<select id="listYears" resultType="java.lang.String">
select distinct year from t_score order by year
</select>
<select id="listTotal" resultType="com.zqzw.echart.entity.TotalScore">
select sum(score) totalScore,year from t_score where sno = #{sno} group by year order by year
</select>
<select id="listStudents" resultType="com.zqzw.echart.entity.Student">
select student_name,sno from t_student
</select>
</mapper>前端代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>ECharts-Demo</title>
</head>
<body>
<h1>成绩查询</h1>
<div id="main" style="width: 600px;height:400px;" ></div>
<select id="year" style = "width: 100px"></select>
<button id = "b1" onclick="list();">某年每个学生的各科分数</button>
<select id="student" style = "width: 100px"></select>
<button id = "b2" onclick="listTotal();">某学生三年总分折线图</button>
</body>
</html>
<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
<script src="
https://cdn.jsdelivr.net/npm/echarts@5.4.2/dist/echarts.min.js
"></script>
<script >
const myChart = echarts.init(document.getElementById('main'));
let option = {
xAxis: {
data: []
},
yAxis: {},
series: [
{
type: 'bar',
data: []
},
{
type: 'bar',
data: []
},
{
type: 'bar',
data: []
}
]
};
let option1 = {
xAxis: {
type: 'category',
data: []
},
yAxis: {
type: 'value'
},
series: [
{
data: [],
type: 'line',
label: {
show: false,
position: 'bottom',
textStyle: {
fontSize: 10
}
}
}
]
};
function initSelect1(){
$.ajax({
url:"http://localhost:8080/score/listStudents",
dataType:"json",
data:"{}",
type:"post",
success:function(res){
for(var i = 0; i< res.data.length; i++){
var obj = document.getElementById("student");
obj.options.add(new Option(res.data[i].studentName,res.data[i].sno));
}
}
});
}
initSelect1();
$(function () {
$.ajax({
url:"http://localhost:8080/score/listYears",
dataType:"json",
data:{},
type:"post",
success:function (res) {
var obj = document.getElementById("year");
obj.options.add(new Option(res.data[0],res.data[0],true));
for(var i = 1; i < res.data.length; i++){
obj.options.add(new Option(res.data[i],res.data[i]));
}
}
});
});
function listTotal() {
var obj = document.getElementById("student");
var index = obj.selectedIndex;
var key = obj.options[index].value;
$.ajax({
url: "http://localhost:8080/score/listTotal",
data: {"sno": key},
dataType: "json",
type: "post",
success: function (res) {
option1.xAxis.data = res.data[0];
for (var i = 1; i < res.data.length; i++) {
option1.series[i - 1].data = res.data[i];
}
myChart.clear();
myChart.setOption(option1);
}
});
}
function list(){
var obj = document.getElementById("year");
var index = obj.selectedIndex;
if(index < 0){
index = 0;
}
var key = obj.options[index].value;
$.ajax({
url:"http://localhost:8080/score/listScore", //请求的url地址
dataType:"json", //返回格式为json
data:{"year": key}, //参数值
type:"post", //请求方式
success:function(res){
option.xAxis.data = res.data[0];
option.series[0].data = res.data[1];
option.series[1].data = res.data[2];
option.series[2].data = res.data[3];
myChart.clear();
myChart.setOption(option);
},
error:function(){
}
});
}
</script>以上就是Spring + ECharts实现数据可视化的案例详解的详细内容，更多关于Spring + ECharts数据可视化的资料请关注脚本之家其它相关文章！