将图像插入mysql数据库

Question

我使用以下Java代码将图像插入MySQL数据库。

import org.jfree.chart.*;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PiePlot3D;
import org.jfree.data.general.DefaultPieDataset;
import org.jfree.data.general.PieDataset;
import org.jfree.util.Rotation;
import java.sql.*;
import java.io.*;

import javax.swing.JFrame;

public class PieChart extends JFrame {

    private static final long serialVersionUID = 1L;

    public PieChart(String applicationTitle, String chartTitle) {
        super(applicationTitle);
        // This will create the dataset 
        PieDataset dataset = createDataset();
        // based on the dataset we create the chart
        JFreeChart chart = createChart(dataset, chartTitle);
        // we put the chart into a panel
        ByteArrayOutputStream out = new ByteArrayOutputStream();

        ChartPanel chartPanel = new ChartPanel(chart);
        // default size
        chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
        // add it to our application
        setContentPane(chartPanel);
        try {
            ChartUtilities.writeChartAsPNG(out, chart, 500, 270);
        } catch (Exception e) {
        }

        try {
            byte[] buf = out.toByteArray();
            // setup stream for blob
            ByteArrayInputStream inStream = new ByteArrayInputStream(buf);
            // get or create a connection here
            // System.out.println("***********File Name **************" + filename);
            //System.out.println("***********Employee ID ************" + emp_id);
            System.out.println(inStream);
            try {
                String DB_URL = "jdbc:mysql://localhost/mydatabase";
                // Load the database driver
                Class.forName("com.mysql.jdbc.Driver");
                // static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";  
                //  Database credentials
                String USER = "user";
                String PASS = "pass";

                // Get a connection to the database
                Connection conn = DriverManager.getConnection(DB_URL, USER, PASS);
                String query = "insert into photos (id,photo) values (?, ?)";
                PreparedStatement ps = conn.prepareStatement(query);
                ps.setString(1, "1");
                ps.setBinaryStream(2, inStream, inStream.available());
                int n = ps.executeUpdate();
                inStream.close();
                //Call delete function to delte the files which is uploaded

            } catch (Exception e) {
                System.out.println(e);
            }
        } catch (Exception exc) {  // process error
            System.out.println("process error" + exc);
        }
    }

    /**
     * Creates a sample dataset 
     */
    private PieDataset createDataset() {
        DefaultPieDataset result = new DefaultPieDataset();
        result.setValue("Linux", 29);
        result.setValue("Mac", 20);
        result.setValue("Windows", 51);
        return result;

    }

    /**
     * Creates a chart
     */
    private JFreeChart createChart(PieDataset dataset, String title) {
        JFreeChart chart = ChartFactory.createPieChart3D(
            title, // chart title
            dataset, // data
            true, // include legend
            true,
            false);

        PiePlot3D plot = (PiePlot3D) chart.getPlot();
        plot.setStartAngle(290);
        plot.setDirection(Rotation.CLOCKWISE);
        plot.setForegroundAlpha(0.5f);
        return chart;
    }
}

由于某种原因未插入图像。正在插入ID但不插入图像。照片字段长71个字节，但不保留图像。 （类型为long blob）。