如何从数据库中检索图像并放在JSP上？

<img src="ImageServlet">

import java.io.IOException;
import java.io.OutputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ImageServlet extends HttpServlet {
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // 连接数据库
        Connection conn = null;
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase", "username", "password");
            
            // 执行查询操作
            String sql = "SELECT image_data FROM images WHERE image_id = ?";
            PreparedStatement stmt = conn.prepareStatement(sql);
            stmt.setInt(1, 1); // 假设图像ID为1
            ResultSet rs = stmt.executeQuery();
            
            if (rs.next()) {
                // 获取图像数据
                byte[] imageData = rs.getBytes("image_data");
                
                // 设置响应类型为图像
                response.setContentType("image/jpeg");
                
                // 将图像数据写入响应
                OutputStream out = response.getOutputStream();
                out.write(imageData);
                out.close();
            }
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            // 关闭数据库连接
            try {
                if (conn != null) {
                    conn.close();
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}