我想从mysql数据库中检索数据，并使用jsp在chart/graph中绘图。我尝试了各种网站，如canvasjs和fusioncharts，但我没有从哪里得到数据库值？有人能给我发送示例代码来表示jsp中的图形吗
rhfm7lfc1#
您可以轻松地从数据库中获取值，并使用fuioncharts专用jsp Package 器呈现折线图，以下是参考链接-https://www.fusioncharts.com/dev/getting-started/java/create-charts-in-java-using-database下面是一个通过从数据库获取数据来绘制折线图的小示例
<%@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>
1条答案
按热度按时间rhfm7lfc1#
您可以轻松地从数据库中获取值，并使用fuioncharts专用jsp Package 器呈现折线图，以下是参考链接-https://www.fusioncharts.com/dev/getting-started/java/create-charts-in-java-using-database
下面是一个通过从数据库获取数据来绘制折线图的小示例