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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:

jsp利用echarts实现报表统计的实例

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