Display Blob Servlet : Database « Servlets « Java

Display Blob Servlet

import java.io.IOException;
import java.io.InputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;

import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DisplayBlobServlet extends HttpServlet {
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws IOException,
      ServletException {
    Blob photo = null;
    Connection conn = null;
    Statement stmt = null;
    ResultSet rs = null;

    String query = "select photo from MyPictures where  id = '001'";
    ServletOutputStream out = response.getOutputStream();

    try {
      conn = getHSQLConnection();
    } catch (Exception e) {
      out.println("<html><head><title>Person Photo</title></head>");
      out.println("<body><h1>Database Connection Problem.</h1></body></html>");

    try {
      stmt = conn.createStatement();
      rs = stmt.executeQuery(query);
      if (rs.next()) {
        photo = rs.getBlob(1);
      } else {
        out.println("<html><head><title>Person Photo</title></head>");
        out.println("<body><h1>No photo found for id= 001 </h1></body></html>");

      InputStream in = photo.getBinaryStream();
      int length = (int) photo.length();

      int bufferSize = 1024;
      byte[] buffer = new byte[bufferSize];

      while ((length = in.read(buffer)) != -1) {
        System.out.println("writing " + length + " bytes");
        out.write(buffer, 0, length);

    } catch (SQLException e) {
      out.println("<html><head><title>Error: Person Photo</title></head>");
      out.println("<body><h1>Error=" + e.getMessage() + "</h1></body></html>");
    } finally {
      try {
      } catch (SQLException e) {

  private static Connection getHSQLConnection() throws Exception {
    System.out.println("Driver Loaded.");
    String url = "jdbc:hsqldb:data/tutorial";
    return DriverManager.getConnection(url, "sa", "");

  public static Connection getMySqlConnection() throws Exception {
    String driver = "org.gjt.mm.mysql.Driver";
    String url = "jdbc:mysql://localhost/demo2s";
    String username = "oost";
    String password = "oost";

    Connection conn = DriverManager.getConnection(url, username, password);
    return conn;

  public static Connection getOracleConnection() throws Exception {
    String driver = "oracle.jdbc.driver.OracleDriver";
    String url = "jdbc:oracle:thin:@localhost:1521:databaseName";
    String username = "username";
    String password = "password";

    Class.forName(driver); // load Oracle driver
    Connection conn = DriverManager.getConnection(url, username, password);
    return conn;



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