echarts用来做数据报表的一个展示效果了,这里我们来给各位介绍一个java/jsp利用echarts实现报表统计的例子,例子非常的简单只是把数据调出来给echarts即可了。
开始上代码。
首先是tag,这个东西,大学之后,几乎不怎么用了,没想到现在又用到了。
<%@ tag pageEncoding="UTF-8" isELIgnored="false" body-content="empty"%> <%--自定义div容器id--%> <%@attribute name="container" required="true" %> <%--自定义标题--%> <%@attribute name="title" required="true" %> <%--自定义子标题--%> <%@attribute name="subtitle" required="false" %> <%--自定义数据请求url--%> <%@attribute name="urls" required="true" %> <%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%> <script src="/UploadFiles/2021-04-02/jquery.min.js">写tag需要引入jstl包,谷歌下就有了。1.2之前需要两个包,一个jstl,一个standard。1.2之后貌似合并为一个了。<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>这句的写法也有点不同。为防万一,我是引入的两个包。
使用ajax请求,需要引入jquery的包,引入echarts的时候,同时引入这个。
在上面代码中,最主要的还是标红的那段,series是一个数组,后台加入多组数据的时候,这里需要遍历取出。
jsp页面引入该标签:
<%-- 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="测试标签" subtitle="测试子标签" urls="/tags"></c:linecharts> </body> </html>前端的部分到此算是完成,然后就是后台部分了。
后台用两个java对象,封装一下要传递的数据
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>();//数据分组 public List<String> axis = new ArrayList<String>();//横坐标 public List<Series> series = new ArrayList<Series>();//纵坐标 public Echarts(List<String> legendList, List<String> categoryList, List<Series> seriesList) { super(); this.legend = legendList; this.axis = categoryList; this.series = seriesList; } }这里放series的具体数据:
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; } }后台业务中,将自己的数据,放到对象中,然后转换成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); } }效果图如下:
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