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cenmin
9年前发布

Echarts 动态获取数据进行图表展示的Java示例

Echarts官网的demo都采用的数据都是静态数据,本demo是在Echarts官网入门demo的基础上改的,从后台 获取数据并展示,供入门参考
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前端页面代码    

<%@ page language="java" contentType="text/html; charset=utf-8"   pageEncoding="utf-8"%>  <%   String path = request.getContextPath();  %>  <!DOCTYPE html>    <head>  <meta charset="utf-8">  <title>ECharts</title>  </head>    <body>   <!-- 为ECharts准备一个具备大小(宽高)的Dom -->   <div id="main" style="width: 800px; height: 300px"></div>   <!-- ECharts单文件引入 -->   <script type="text/javascript" src="js/jquery-2.1.4.min.js"></script>   <script type="text/javascript" src="build/dist/echarts.js"></script>   <script src="http://echarts.baidu.com/build/dist/echarts.js"></script>   <script type="text/javascript">    // 路径配置    require.config({     paths : {      echarts : 'build/dist'     }    });      // 使用    require([ 'echarts', 'echarts/chart/bar' // 使用柱状图就加载bar模块,按需加载    ], function(ec) {     // 基于准备好的dom,初始化echarts图表     var myChart = ec.init(document.getElementById('main'));     var option = {      tooltip : {       show : true      },      legend : {       data : []      },      xAxis : [ {       type : 'category',       data : []      } ],      yAxis : [ {       type : 'value'      } ],      series : []     };     $.ajax({      type : "POST",      url : "gettestdata",      dataType : "json",      success : function(result) {       //将从后台接收的json字符串转换成json对象       var jsonobj = eval(result);       //给图标标题赋值       option.legend.data = jsonobj.legend;       //读取横坐标值       option.xAxis[0].data = jsonobj.axis;       var series_arr = jsonobj.series;       //驱动图表生成的数据内容,数组中每一项代表一个系列的特殊选项及数据       for (var i = 0; i < series_arr.length; i++) {        option.series[i] = result.series[i];       }       //过渡控制,隐藏loading(读取中)       myChart.hideLoading();        // 为echarts对象加载数据       myChart.setOption(option);      }     });    });   </script>  </body>

后台数据封装代码    

//通过ajax请求数据 将请求的数据返回到页面进行图表的显示   @RequestMapping("gettestdata")   public void getTestData(HttpServletResponse response) {    List<String> legend = new ArrayList<String>(Arrays.asList(new String[] { "销量"}));    List<String> axis = new ArrayList<String>(      Arrays.asList(new String[] { "衬衫", "羊毛衫", "雪纺衫", "裤子", "高跟鞋", "袜子" }));    List<Series> series = new ArrayList<Series>();    series.add(new Series("销量", "bar", new ArrayList<Integer>(Arrays.asList(5, 20, 40, 10, 10, 20))));    Echarts echarts = new Echarts(legend, axis, series);    response.setContentType("text/html;charset=utf-8");    PrintWriter out;    try {     out = response.getWriter();     Gson gson = new Gson();     String str = gson.toJson(echarts);     System.out.println("str:"+str);     out.write(str);     out.flush();     out.close();    } catch (IOException e) {     e.printStackTrace();    }   }