echarts用來做資料報表的一個展示效果了，這裡我們來給各位介紹一個java/jsp利用echarts實現報表統計的例子，例子非常的簡單只是把資料調出來給echarts即可了。
開始上代碼。
首先是tag，這個東西，大學之後，幾乎不怎麼用了，沒想到現在又用到了。
<%@ tag pageEncoding="UTF-8" isELIgnored="false" body-content="empty"%><%--自訂div容器id--%><%@attribute name="container" required="true" %><%--自訂標題--%><%@attribute name="title" required="true" %><%--自訂子標題--%><%@attribute name="subtitle" required="false" %><%--自訂資料請求url--%><%@attribute name="urls" required="true" %><%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%><script src="/echarts-2.1.8/build/dist/jquery.min.js"></script><script src="/echarts-2.1.8/build/dist/echarts-all.js"></script><script type="text/javascript"> // 基於準備好的dom，初始化echarts圖表 var myChart = echarts.init(document.getElementById('${container}')); var option={ title : { text: '${title}', subtext: '${subtitle}' }, tooltip : { trigger: 'axis' }, legend: { data:[] }, toolbox: { show : true, feature : { mark : {show: true}, dataView : {show: true, readOnly: false}, magicType : {show: true, type: ['line', 'bar']}, restore : {show: true}, saveAsImage : {show: true} } }, calculable : true, xAxis : [ { type : 'category', boundaryGap : false, data : [] } ], yAxis : [ { type : 'value', axisLabel : { formatter: '{value} ' } } ], series : [] }; //採用ajax非同步請求資料 $.ajax({ type:'post', url:'${urls}', dataType:'json', success:function(result){ if(result){ //將返回的category和series對象賦值給options對象內的category和series option.xAxis[0].data = result.axis; option.legend.data = result.legend; var series_arr=result.series; for(var i=0;i<series_arr.length;i++){ option.series[i] = result.series[i]; } myChart.hideLoading(); myChart.setOption(option); } }, error:function(errMsg){ console.error("載入資料失敗") } }); // 為echarts對象載入資料 // myChart.setOption(option);</script>
寫tag需要引入jstl包，Google下就有了。1.2之前需要兩個包，一個jstl，一個standard。1.2之後貌似合并為一個了。<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>這句的寫法也有點不同。為防萬一，我是引入的兩個包。
使用ajax請求，需要引入jquery的包，引入echarts的時候，同時引入這個。
在上面代碼中，最主要的還是標紅的那段，series是一個數組，後台加入多組資料的時候，這裡需要遍曆取出。
jsp頁面引入該標籤：
<%-- Created by IntelliJ IDEA. User: Administrator Date: 2014/11/24 Time: 12:02 To change this template use File | Settings | File Templates.--%><%@ page contentType="text/html;charset=UTF-8" language="java" %><%@taglib prefix="c" tagdir="/WEB-INF/tags" %><html><head> <title></title></head><body> <div id="main" style="height: 400px"></div> <c:linecharts container="main" title="測試標籤" subtitle="測試子標籤" urls="/tags"></c:linecharts></body></html>
前端的部分到此算是完成，然後就是後台部分了。
後台用兩個java對象，封裝一下要傳遞的資料
package bean.newseries;import java.util.ArrayList;import java.util.List;/** * Created by on 2014/11/25. */public class Echarts { public List<String> legend = new ArrayList<String>();//資料分組 public List<String> axis = new ArrayList<String>();//橫座標 public List<Series> series = new ArrayList<Series>();//縱座標 public Echarts(List<String> legendList, List<String> categoryList, List<Series> seriesList) { super(); this.legend = legendList; this.axis = categoryList; this.series = seriesList; }}
這裡放series的具體資料：
package bean.newseries;import java.util.List;/** * Created by on 2014/11/25. */public class Series { public String name; public String type; public List<Integer> data; public Series(String name, String type, List<Integer> data) { this.name = name; this.type = type; this.data = data; }}
後台業務中，將自己的資料，放到對象中，然後轉換成json格式：
package tagservlet;import bean.newseries.Echarts;import bean.newseries.Series;import com.fasterxml.jackson.databind.ObjectMapper;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;import java.io.PrintWriter;import java.util.ArrayList;import java.util.Arrays;import java.util.List;/** * Created by on 2014/11/24. */public class NewTagServlet extends HttpServlet { protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { List<String> legend=new ArrayList<String>(Arrays.asList(new String[]{"最高值","最低值"})); List<String> axis=new ArrayList<String>(Arrays.asList(new String[]{"周一","周二","周三","周四","周五","周六","周日"})); List<Series> series=new ArrayList<Series>(); series.add(new Series("最高值","line",new ArrayList<Integer>(Arrays.asList(21,23,28,26,21,33,44)))); series.add(new Series("最低值","line",new ArrayList<Integer>(Arrays.asList(-2,-12,10,0,20,11,-6)))); Echarts echarts=new Echarts(legend,axis,series); ObjectMapper objectMapper=new ObjectMapper(); System.out.println(objectMapper.writeValueAsString(echarts)); response.setContentType("text/html;charset=utf-8"); PrintWriter out=response.getWriter(); out.println(objectMapper.writeValueAsString(echarts)); out.flush(); out.close(); } protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request,response); }}
效果圖如下：
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