Spring MVC Charts & Graphs from JSON Data Using AJAX

Download Spring MVC Chart Samples 
<!--
File Name: chart.jsp
Author: Team CanvasJS
-->
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
	pageEncoding="ISO-8859-1"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<script type="text/javascript">
window.onload = function() {

var chart = new CanvasJS.Chart("chartContainer", {
	theme: "light2", // "light1", "dark1", "dark2"
	animationEnabled: true,
	title: {
		text: "Letter Frequency of Vowels in English"
	},
	axisX: {
		labelFontSize: 18
	},
	axisY: {
		title: "Frequency",
		suffix: "%"
	},
	data: [{
		type: "column",
		indexLabel: "{y}",
		indexLabelFontSize: 18,
		yValueFormatString: "#,##0.0#\"%\""
	}]
});

function addData(data) {
	chart.options.data[0].dataPoints = data;
	chart.render();
}

$.getJSON("/CanvasJS_Spring_MVC_Charts/restfull-service/letter-frequency-of-vowels-in-english.json", addData);

}
</script>
</head>
<body>
	<div id="chartContainer" style="height: 370px; width: 100%;"></div>
	<script src="https://canvasjs.com/assets/script/jquery-1.11.1.min.js"></script>
	<script src="https://cdn.canvasjs.com/canvasjs.min.js"></script>
</body>
</html>                              
//CanvasjsChartController.java
package com.canvasjs.chart.controllers;

import org.springframework.stereotype.Controller;
import org.springframework.ui.ModelMap;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

@Controller
@RequestMapping("/canvasjschart")
public class CanvasjsChartController {

	@RequestMapping(method = RequestMethod.GET)
	public String springMVC(ModelMap modelMap) {
		return "chart";
	}

}


//RestController.java
package com.canvasjs.chart.controllers;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;


import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import com.canvasjs.chart.services.CanvasjsChartService;


@Controller
@RequestMapping(value = "/restfull-service")
public class RestController extends HttpServlet {
	private static final long serialVersionUID = 1L;
	
	@Autowired
	private CanvasjsChartService canvasjsChartService;
	
	@RequestMapping(value = "/letter-frequency-of-vowels-in-english.json", method = RequestMethod.GET)
	public @ResponseBody String getDataPoints(HttpServletRequest request, HttpServletResponse response) throws Exception {
		
		return canvasjsChartService.getCanvasjsChartData();
	}
	
}                        
//CanvasjsChartService.java
package com.canvasjs.chart.services;

public interface CanvasjsChartService {

	String getCanvasjsChartData();

}


//CanvasjsChartServiceImpl.java
package com.canvasjs.chart.services;

import org.springframework.beans.factory.annotation.Autowired;

import com.canvasjs.chart.daos.CanvasjsChartDao;

public class CanvasjsChartServiceImpl implements CanvasjsChartService {

	@Autowired
	private CanvasjsChartDao canvasjsChartDao;

	public void setCanvasjsChartDao(CanvasjsChartDao canvasjsChartDao) {
		this.canvasjsChartDao = canvasjsChartDao;
	}

	@Override
	public String getCanvasjsChartData() {
		return canvasjsChartDao.getCanvasjsChartData();
	}

}                        
//CanvasjsChartDao.java
package com.canvasjs.chart.daos;

public interface CanvasjsChartDao {

	String getCanvasjsChartData();

}


//CanvasjsChartDaoImpl.java
package com.canvasjs.chart.daos;

import com.canvasjs.chart.data.CanvasjsChartData;

public class CanvasjsChartDaoImpl implements CanvasjsChartDao {
	
	@Override
	public String getCanvasjsChartData() {
		return CanvasjsChartData.getCanvasjsDataList();
	}

}                        
//CanvasjsChartData.java
package com.canvasjs.chart.data;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.net.URL;
import java.nio.charset.Charset;

import org.json.JSONException;
import org.json.JSONArray;

public class CanvasjsChartData {

	static JSONArray json = null;

	static {

		try {
			json = readJsonFromUrl("https://canvasjs.com/data/gallery/spring-mvc/letter-frequency-of-vowels-in-english.json");
		} catch (Exception e) {
			e.printStackTrace();
		}

	}

	private static String readAll(Reader rd) throws IOException {
		StringBuilder sb = new StringBuilder();
		int cp;
		while ((cp = rd.read()) != -1) {
			sb.append((char) cp);
		}
		return sb.toString();
	}

	public static JSONArray readJsonFromUrl(String url) throws IOException, JSONException {
		InputStream is = new URL(url).openStream();
		try {
			BufferedReader rd = new BufferedReader(new InputStreamReader(is, Charset.forName("UTF-8")));
			String jsonText = readAll(rd);
			JSONArray json = new JSONArray(jsonText);
			return json;
		} finally {
			is.close();
		}
	}

	public static String getCanvasjsDataList() {
		return json.toString();
	}
}