Question

我想从MYSQL数据库中检索数据并使用JSP在图表中绘图，我尝试了各种站点，例如canvas.js和Fusioncharts，但我无法从数据库值中获取任何人可以向我发送示例代码来表示来自JSP的图形的信息< / p>

Answer 1

您可以使用FuionCharts专用JSP包装器轻松地从数据库中获取值并绘制折线图，这是参考链接-https://www.fusioncharts.com/dev/getting-started/java/create-charts-in-java-using-database

这是通过从数据库中获取折线图来绘制折线图的一个小例子

<%@page import="com.mysql.jdbc.Driver"%>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@page import="java.util.*" %>
<%@page import="fusioncharts.FusionCharts" %>
<%@page import="java.sql.*" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<title>FusionCharts | Chart Using Database (MySQL)</title>
<link href="../Styles/ChartSampleStyleSheet.css" rel="stylesheet" />
<script type="text/javascript" src="//cdn.fusioncharts.com/fusioncharts/latest/fusioncharts.js"></script>
   <script type="text/javascript" src="//cdn.fusioncharts.com/fusioncharts/latest/themes/fusioncharts.theme.fusion.js"></script>

</head>
<body>
 <h3>Chart Using Database (MySQL)</h3>
<div id="database_chart"></div>
<div><span><a href="../Index.jsp">Go Back</a></span></div>
<%
Connection con = null;
String url = "jdbc:mysql://localhost:3306/drilldowndb";
String user = "root";
String password = "P@ssw0rd";
String query = "SELECT `Region`, SUM(`Total sales`) FROM `Sales_Record` group by Region";
Class.forName("com.mysql.jdbc.Driver").newInstance();
con = DriverManager.getConnection(url,user,password);
Statement st = con.createStatement();
String sql = (query);
ResultSet rs = st.executeQuery(sql);


//store chart config name-config value pair
Map<String, String> chartConfig = new HashMap<String, String>();
chartConfig.put("caption", "Total Sales by Region");
chartConfig.put("xAxisName", "Region");
chartConfig.put("yAxisName", "Total Sales");
chartConfig.put("numberSuffix", "k");
chartConfig.put("theme", "fusion");

StringBuilder jsonData = new StringBuilder();
StringBuilder data = new StringBuilder();
// json data to use as chart data source
jsonData.append("{\"chart\":{");
for(Map.Entry conf:chartConfig.entrySet())
{
    jsonData.append("\"" + conf.getKey()+"\":\""+conf.getValue() + "\",");
}

jsonData.replace(jsonData.length() - 1, jsonData.length() ,"},");

// build  data object from label-value pair
data.append("\"data\":[");

while (rs.next())
{
    data.append("{\"label\":\"" + rs.getString(1) + "\",\"value\":\"" + rs.getString(2) +"\"},");
}
data.replace(data.length() - 1, data.length(),"]");

jsonData.append(data.toString());
jsonData.append("}");

con.close();
//Create chart instance
// charttype, chartID, width, height,containerid, data format, data
FusionCharts firstChart = new FusionCharts(
          "line", 
          "data_from_mysql", 
          "800",
          "550", 
          "database_chart",
          "json", 
          jsonData.toString()
);
%>
<%=firstChart.render() %>
</body>

</html>

使用来自数据库值的jsp绘制线图

1 个答案: