官网：https://echarts.apache.org/zh/index.html
下载：https://echarts.apache.org/zh/builder.html
实例：https://echarts.apache.org/examples/zh/index.html
教程：https://echarts.apache.org/zh/tutorial.html
(官网5分钟上手 ECharts)
1. ECharts 概述
ECharts 是一个使用 JavaScript 实现的开源数据可视化库，涵盖各行业图表，满足各种需求。
ECharts 遵循 Apache-2.0 开源协议，免费商用。
ECharts 兼容当前绝大部分浏览器（IE8/9/10/11，Chrome，Firefox，Safari等）及兼容多种设备，可随时随地任性展示。
2. ECharts 使用步骤
① 引入 echarts.min.js 以及引入 jquery-3.5.1.min.js
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| <script src="echarts/echarts.min.js"></script>
<script src="js/jquery-3.5.1.min.js"></script>
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或者 CDN 链接引入 JS 库：
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| <script src="https://cdn.staticfile.org/echarts/4.3.0/echarts.min.js"></script>
<script src="https://cdn.staticfile.org/jquery/3.5.1/jquery.min.js"></script>
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② 给定一个拥有 id 和宽高的 DOM 容器，如 div
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<div id="main" style="width: 600px; height: 400px"></div>
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③ 官网选择一个图表样式，编辑 option 填充 script 即可
两个方法一组option参数。init 方法、setOption 方法、option 参数从官网图表样式中来。
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| <script>
$(function () {
var eCharts = echarts.init(document.getElementById("main"));
eCharts.setOption({
});
})
</script>
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3. ECharts 官方示例
柱状图：
柱状图示例源码：
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| <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>ECharts</title>
<%--1.引入echarts.js--%>
<script src="echarts/echarts.min.js"></script>
<script src="js/jquery-3.5.1.min.js"></script>
<script>
$(function () {
var myChart = echarts.init(document.getElementById('main'));
myChart.setOption({
title: {
text: 'ECharts 入门示例'
},
tooltip: {},
legend: {
data:['销量']
},
xAxis: {
data: ["衬衫","羊毛衫","雪纺衫","裤子","高跟鞋","袜子"]
},
yAxis: {},
series: [{
name: '销量',
type: 'bar',
data: [5, 20, 36, 10, 10, 20]
}]
});
})
</script>
</head>
<body>
<%--2.设定一个固定宽高的 DOM 容器--%>
<div id="main" style="width: 600px; height: 400px;"></div>
</body>
</html>
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饼状图：
饼状图示例源码：
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| <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>ECharts 饼状图</title>
<script src="echarts/echarts.min.js"></script>
<script src="js/jquery-3.5.1.min.js"></script>
<script>
$(function () {
var eCharts = echarts.init(document.getElementById("main"));
eCharts.setOption({
series: [
{
name: '访问来源',
type: 'pie',
radius: '55%',
data: [
{value: 235, name: '视频广告'},
{value: 274, name: '联盟广告'},
{value: 310, name: '邮件营销'},
{value: 335, name: '直接访问'},
{value: 500, name: '搜索引擎'}
]
}
]
});
})
</script>
</head>
<body>
<div id="main" style="width: 600px; height: 400px"></div>
</body>
</html>
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4. ECharts 异步请求
官网教程和示例：https://echarts.apache.org/zh/tutorial.html#异步数据加载和更新
echarts1.jsp
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| <%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
<title>Echarts饼状图</title>
<script src="echarts/echarts.min.js"></script>
<script src="js/jquery-3.2.1.min.js"></script>
<script>
$(function () {
var eCharts = echarts.init(document.getElementById("main"));
$.get("${pageContext.request.contextPath}/demo01",{},function (data) {
console.log(data);
var option = {
xAxis: {
type: 'category',
data: data.list1
},
yAxis: {
type: 'value'
},
series: [{
data: data.list2,
type: 'line',
smooth: true
}]
};
eCharts.setOption(option);
},"json");
})
</script>
</head>
<body>
<div id="main" style="width: 600px;height: 400px"></div>
</body>
</html>
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Demo01Servlet.java
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| @WebServlet(name = "Demo01Servlet",urlPatterns = "/demo01")
public class Demo01Servlet extends HttpServlet {
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("Demo01Servlet");
SaleService saleService = new SaleServiceImpl();
try {
List<Sale> saleList = saleService.selectSalesList();
List<String> weekList = new ArrayList<>();
List<Integer> salesList = new ArrayList<>();
for (Sale sale : saleList) {
weekList.add(sale.getWeekName());
salesList.add(sale.getSales());
}
Map<String,Object> map = new HashMap<>();
map.put("list1",weekList);
map.put("list2",salesList);
JsonUtils.writeJsonStr(response,map);
} catch (Exception e) {
e.printStackTrace();
}
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doPost(request, response);
}
}
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Sale.java
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| @Data
@NoArgsConstructor
@AllArgsConstructor
public class Sale {
private Integer id;
private Integer sales;
private String weekName;
}
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