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Line Graphs in java

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Line Graphs in java
1 Answer(s)      7 years ago
Posted in : Java Beginners
Hi...

I need to generate a graph by using the database values using java
I know about the JFreeChart class...
But by using that...I'm unable to display the values in the chart.
I'm just getting the points...
I need to get the values also at the specific point in the chart..
and it should be only xyline graph and the values should be in the chart itself...
Is there any way to solve this..??
can anyone help...


Thanks in advance
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View Answers

May 28, 2010 at 11:49 AM


Hi Friend,

Try the following code:

import java.sql.*;
import java.io.*;
import org.jfree.ui.*;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartUtilities;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.data.*;
import org.jfree.data.jdbc.JDBCCategoryDataset;

public class Chart {
public static void main(String[] args) throws Exception {

String query = "SELECT * from chart";
JDBCCategoryDataset dataset = new JDBCCategoryDataset(
"jdbc:mysql://localhost:3306/test";, "com.mysql.jdbc.Driver",
"root", "root");

dataset.executeQuery(query);
JFreeChart chart = ChartFactory.createLineChart("Test", "Id", "Score",
dataset, PlotOrientation.VERTICAL, true, true, false);
ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
ApplicationFrame f=new ApplicationFrame("Chart");
f.setContentPane(chartPanel);
f.pack();
f.setVisible(true);
try {
ChartUtilities.saveChartAsJPEG(new File("C:/chart.jpg"), chart,
400, 300);
} catch (IOException e) {
System.out.println("Problem in creating chart.");
}
}
}

Thanks

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