（一）初步入门
1，可视化经典案例：http://www.storagelab.org.cn/zhangdi/2015/10/27/
（二）准备工作：导入的jar包：https://blog.csdn.net/weixin_43209201/article/details/86305569
导入的js文件：echarts.main.js jquary-x.x.x.main.js
Echarts的官网文档：https://www.echartsjs.com/zh/tutorial.html#5%20%E5%88%86%E9%92%9F%E4%B8%8A%E6%89%8B%20ECharts
（三）使用后台数据绘制图表
1，点击页面，跳转链接设为图表页面的url <a href="chart-1.html">统计图</a>
2，servlet中接受从数据库查到的数据并转为json类型
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { QueryFromMySql queryFromMySql=new QueryFromMySql(); ArrayList<LeiXinTj> leiXinTjs=queryFromMySql.QueryByTypet();
数据库读取的数据：
response.setContentType("text/html; charset=utf-8"); System.out.println("**************************************"); JSONArray jsonArray=JSONArray.fromObject(leiXinTjs); //即将数据转为json类型 System.out.println(jsonArray.toString()); PrintWriter writer = response.getWriter(); writer.println(jsonArray); writer.flush(); writer.close(); }
3，在展示图表页面用Ajax将数据传给图表：
<!DOCTYPE HTML> <html> <head> <meta charset="utf-8"> <meta name="renderer" content="webkit|ie-comp|ie-stand"> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> <meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1.0,maximum-scale=1.0,user-scalable=no" /> <meta http-equiv="Cache-Control" content="no-siteapp" /> <!--[if lt IE 9]> <script type="text/javascript" src="lib/html5shiv.js"></script> <script type="text/javascript" src="lib/respond.min.js"></script> <![endif]--> <link rel="stylesheet" type="text/css" href="../static/h-ui/css/H-ui.min.css" /> <link rel="stylesheet" type="text/css" href="../static/h-ui.admin/css/H-ui.admin.css" /> <link rel="stylesheet" type="text/css" href="../lib/Hui-iconfont/1.0.8/iconfont.css" /> <link rel="stylesheet" type="text/css" href="../static/h-ui.admin/skin/default/skin.css" id="skin" /> <link rel="stylesheet" type="text/css" href="../static/h-ui.admin/css/style.css" /> <!--[if IE 6]> <script type="text/javascript" src="lib/DD_belatedPNG_0.0.8a-min.js" ></script> <script>DD_belatedPNG.fix('*');</script> <![endif]--> <title>统计图</title> </head> <!--_footer 作为公共模版分离出去--> <script type="text/javascript" src="../lib/jquery/1.9.1/jquery.min.js"></script> <script type="text/javascript" src="../lib/layer/2.4/layer.js"></script> <script type="text/javascript" src="../static/h-ui/js/H-ui.min.js"></script> <script type="text/javascript" src="../static/h-ui.admin/js/H-ui.admin.js"></script> <!--/_footer 作为公共模版分离出去--> <!--请在下方写此页面业务相关的脚本--> <script type="text/javascript" src="echarts.min.js"></script> <script type="text/javascript" src="jquery-1.10.2.min.js"></script> <script type="text/javascript" src="jquery-1.11.3.min.js"></script> <script type="text/javascript"> window.onload=function(){ //将数据传到图表： function loadData(option) { $.ajax({ type : 'post', //传输类型 async : false, //同步执行 url : '../QueryByTypet', //Servlet的路径 data : {}, dataType : 'json', //返回数据形式为json success : function(result) { if (result) { //初始化xAxis[0]的data option.xAxis[0].data = []; for (var i=0; i<result.length; i++) { option.xAxis[0].data.push(result[i].name); } //初始化series[0]的data option.series[0].data = []; for (var i=0; i<result.length; i++) { option.series[0].data.push(result[i].num); } } }, error : function(errorMsg) { alert("加载数据失败"); } });//AJAX }//loadData() var dom = document.getElementById("container"); var nav=document.getElementById("nav"); nav.innerHTML='<i class="Hui-iconfont"></i> 首页 <span class="c-gray en">></span> 信件类型统计<span class="c-gray en">></span> 统计图 <a class="btn btn-success radius r" style="line-height:1.6em;margin-top:3px" href="javascript:location.replace(location.href);" title="刷新" ><i class="Hui-iconfont"></i></a>'; //绘制图表：var myChart = echarts.init(dom); var app = {}; option = null; option = { tooltip: { trigger: 'axis', axisPointer: { type: 'cross', crossStyle: { color: '#999' } } }, toolbox: { feature: { dataView: {show: true, readOnly: false}, magicType: {show: true, type: ['line', 'bar']}, restore: {show: true}, saveAsImage: {show: true} } }, legend: { data: ['信件类型'] }, xAxis: [ { type: 'category', } ], yAxis: [ { type: 'value', } ], series: [ { name: '信件类型', type: 'bar', } ] }; ; loadData(option); if (option && typeof option === "object") { myChart.setOption(option, true); } } </script> <body> <nav class="breadcrumb" id="nav"> </nav> <div class="page-container"> <div id="container" style="min-700px;height:400px"></div> </div> <footer class="footer mt-20"> <div class="container"> <p>感谢你们的使用 ©2020 北京信件统计<br> 本后台系统由<a href="" target="_blank" title="">石家庄铁道大学软件工程</a>提供技术支持</p> </div> </footer> </body> </html>
具体流程：
1，引入echart.js文件在script中
2，创建DOM元素
3，配置图表属性
