echarts用來做數據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數據調出來給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"%> <%--自定義div容器id--%> <%@attribute name="container" required="true" %> <%--自定義標題--%> <%@attribute name="title" required="true" %> <%--自定義子標題--%> <%@attribute name="subtitle" required="false" %> <%--自定義數據請求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"> // 基於准備好的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 : [] }; //采用ajax異步請求數據 $.ajax({ type:'post', url:'${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("加載數據失敗") } }); // 為echarts對象加載數據 // myChart.setOption(option); </script>
寫tag需要引入jstl包,谷歌下就有了。1.2之前需要兩個包,一個jstl,一個standard。1.2之後貌似合並為一個了。<%@ 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,後台加入多組數據的時候,這裡需要遍歷取出。
jsp頁面引入該標簽:
<%-- 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="測試標簽" subtitle="測試子標簽" 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,封裝一下要傳遞的數據
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>();//數據分組 public List<String> axis = new ArrayList<String>();//橫坐標 public List<Series> series = new ArrayList<Series>();//縱坐標 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的具體數據:
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,將自己的數據,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: