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having problem for display the piechart in JSP

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Join Date: Oct 2006

Posts: 2

Reputation: ypsmag is an unknown quantity at this point

Solved Threads: 0

ypsmag

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having problem for display the piechart in JSP

Oct 9th, 2006

i calling the method to display in web browser using JSP....ii have create the piechart using java code and save it ask JPEG......i just want to use JSP to calling and dispaly the method and display the JPEG pie chart in web browser.....

anyone who can help me here i'm very appriaciate it....
thanks you.......

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this is my StoreData.java file ....this is my java file that create pie chart and the data is calling from db4o database.....
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package com;

import java.io.File;

import com.db4o.Db4o;
import com.db4o.ObjectContainer;
import com.db4o.ObjectSet;

import org.jfree.chart.*;
import org.jfree.data.general.*;

public class StoreData{

private static final long serialVersionUID = 1L;
private final static String filename = "C:\\CountryPieChart.yap";

public static String getFname()
{
return "C:\\CountryPieChart.jpg";
}

public static void main(String[] args){
//Delete the existing file
new File(filename).delete();
ObjectContainer db=Db4o.openFile(filename);
try {
StoreAllData();
retrieveAllData();
} finally{
db.close(); //Close the database
}
}

public static void StoreAllData() {
//Delete the existing file
new File(filename).delete();
ObjectContainer db = Db4o.openFile(filename);

//Add data to the database
CountryPeople countryName_1 = new CountryPeople("Malaysia", 100);
CountryPeople countryName_2 = new CountryPeople("New Z", 200);
CountryPeople countryName_3 = new CountryPeople("UK", 300);
CountryPeople countryName_4 = new CountryPeople("Thailand", 400);
CountryPeople countryName_5 = new CountryPeople("Singapore", 50);

//set the value to database
db.set(countryName_1);
db.set(countryName_2);
db.set(countryName_3);
db.set(countryName_4);
db.set(countryName_5);
}

public static void retrieveAllData() {

//Open db
ObjectContainer db = Db4o.openFile(filename);

//Retrieve via empty object
CountryPeople cName = new CountryPeople(null, 0);

ObjectSet result = db.get(cName);

DefaultPieDataset dataset = new DefaultPieDataset();

//retrieve the data from database
while(result.hasNext()) {
CountryPeople obj = (CountryPeople) result.next();
dataset.setValue(obj.getName(), obj.getValue());
//System.out.println(result.next());
}

//Create pie chart
JFreeChart chart = ChartFactory.createPieChart(
"Sample Chart",
dataset,
true,
true,
false);
try {
//save the pie chart as JPEG file
ChartUtilities.saveChartAsJPEG(new File("C:\\CountryPieChart.jpg"), chart, 500, 300);
} catch(Exception e) {
System.out.println("Problem for creating chart");
}
}
}

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this is my jsp coding .... i dont know what is the problem.........coz i very new for jsp and java............thanks....
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<%@page import org.jfree.data.general.PieDataset %>
<jsp:useBean id="myStoreData" class="com.StoreData" scope="page"/>

<html>
<head><title>Testing Displaying</title>
</head>
<body>

<b>Testing Display Page</b>

<img src="<jsp:getProperty name="myStoreData" property="fname" />" />
</body>

</html>
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