ECharts Java 动态加载数据

浏览数：84 / 时间：2015年06月08日

1、前台JSP页面

<%@ page language="java" contentType="text/html; charset=UTF-8"
    pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
	<title>ECharts</title>
	<script type="text/javascript" src="${ctx}/plugins/echarts-2.2.1/echarts.js"></script>
	<script type="text/javascript" src="${ctx}/plugins/jquery-1.8.3/jquery-1.8.3.min.js"></script>
	<script type="text/javascript">
		// 配置路径
		require.config({
			paths: {
				echarts: '${ctx}/plugins/echarts-2.2.1'
			}
		});
		
		// 按需加载
		require(
			[
			 	'echarts', 
			 	'echarts/chart/bar',
			 	'echarts/chart/line'
			],
			function (ec) {
				var chart = document.getElementById('chart');
				var echart = ec.init(chart);
				
				echart.showLoading({
					text: '正在努力加载中...'
				});
				
				var categories = [];
				var values = [];
				
				// 同步执行
				$.ajaxSettings.async = false;
				
				// 加载数据
				$.getJSON('${ctx}/dataAccessServlet', function (json) {
					categories = json.categories;
					values = json.values;
				});
				
				var option = {
					tooltip: {
						show: true
					},
					legend: {
						data: ['销量']
					},
					xAxis: [
					    {
					    	type: 'category',
					    	data: categories
					    }
					],
					yAxis: [
					    {
					    	type: 'value'
					    }
					],
					series: [
					    {
					    	'name': '销量',
					    	'type': 'bar',
					    	'data': values
					    }
					]
				};
				
				echart.setOption(option);
				echart.hideLoading();
			}
		);
	</script>
</head>
<body>
	<div id="chart" style="width: 580px;height: 420px;margin: 0 auto;border: 1px solid gray;"></div>
</body>
</html>

2、后台JSON数据

protected void doPost(HttpServletRequest request,
		HttpServletResponse response) throws ServletException, IOException {
	String[] categories = {"鞋", "衬衫", "外套", "牛仔裤"};
	Integer[] values = {80, 50, 75, 100};
	Map<String, Object> json = new HashMap<String, Object>();
	json.put("categories", categories);
	json.put("values", values);
	JsonUtils.writeJson(json, request, response);
}

3、最终实现效果

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