How to display pictures stored in a database on a JSP page

1. Find the binary data of the picture from the database, set the found data into the session

Request.getsession (). SetAttribute ("img", binary data of the picture);

2. Write the data into the stream

 
 1 package cn.jbit.auction.web.servlet;
 2 
 3 import java.io.IOException;
 4 
 5 import javax.servlet.ServletException;
 6 import javax.servlet.http.HttpServlet;
 7 import javax.servlet.http.HttpServletRequest;
 8 import javax.servlet.http.HttpServletResponse;
 9 
10 public class ShowImgServlet extends HttpServlet {
11     private static final long serialVersionUID = 306275585861980357L;
12     public void doGet(HttpServletRequest request, HttpServletResponse response)
13             throws ServletException, IOException {
14         doPost(request, response);
15     }
16 
17     public void doPost(HttpServletRequest request, HttpServletResponse response)
18             throws ServletException, IOException {
19         byte[] imgBytes = (byte[]) request.getSession().getAttribute("img");
20         response.getOutputStream().write(imgBytes);
21     }
22 }

3. Change the configuration of the Web. xml file (modify <url-pattern> parameters)

<servlet-mapping>
<servlet-name>ShowImgServlet</servlet-name>
<url-pattern>/auctionimg.jpg</url-pattern>
</servlet-mapping>

4. Display on JSP page

/auctionimg.jpg" width= "+ height=" 185 "alt=" picture/>

How to display pictures stored in a database on a JSP page