使用java从sql数据库插入和获取时不显示图像

Question

这是从数据库提交和检索图像的代码，但图像在数据库中既不可见，也不在jpg文件中（当我提取它们时）。谁能告诉我错误是什么？

public void actionPerformed(ActionEvent ae) {
    String sw = "";
    if(ae.getSource() == b1) {
        JFileChooser fileChooser = new JFileChooser();
        fileChooser.setFileSelectionMode(JFileChooser.FILES_ONLY);
        fileChooser.showOpenDialog(null);
        File selectedFile = fileChooser.getSelectedFile();
        try {
            // Insert image
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test1","root","kanishkag");
            String INSERT_PICTURE = "insert into image values (?)";
            conn.setAutoCommit(false);
            FileInputStream fis = new FileInputStream(selectedFile);
            byte blob[] = new byte[(byte)selectedFile.length()];
            fis.read(blob);
            PreparedStatement ps = conn.prepareStatement(INSERT_PICTURE);
            ps.setBinaryStream(1, (InputStream)fis, (int) selectedFile.length());
            ps.executeUpdate();
            conn.commit();
            ps.close();
            fis.close();
            conn.close();
        }
        catch(Exception e) {
            System.out.println(""+e);
        }
    }
    else {
        try{
            // Retrieve image
            Class.forName("com.mysql.jdbc.Driver");
            Connection conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/test1","root","kanishkag");
            Statement smt = conn.createStatement();
            ResultSet rs = smt.executeQuery("select pictures from image ");
            int i = 0;
            while(rs.next()) {
                OutputStream os = null;
                InputStream is = null;
                System.out.println("hiiiii");
                BufferedImage bi = new BufferedImage(800,600,
                BufferedImage.TYPE_INT_RGB);
                is = rs.getBinaryStream(1);
                ImageInputStream iis = ImageIO.createImageInputStream(is);
                os = new FileOutputStream(new File("test1"+i+".jpg"));
                ImageOutputStream oss = ImageIO.createImageOutputStream(os);
                i++;
                int c = 0;
                while((c=iis.read())> -1) {
                    os.write(c);
                }
                ImageIO.write(bi, "test1"+i+".jpg", oss);
                os.close();
                is.close();
            }
        }
        catch(Exception e1) {
            e1.printStackTrace();
        }
    }
}