Personnalisation appli par image stockée en Bdd

C'est bon, j'ai trouvé, voir ci dessous un premier jet
la servlet

Code:

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package logo;
 
 
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.sql.Blob;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * 
 */
 
public class Logo extends HttpServlet   {
 
	public void doGet(final HttpServletRequest request, final HttpServletResponse response) 
	throws IOException, ServletException {
		Connection conn = null;
		ResultSet rs = null;
		conn = gestionBdd.PoolDeConnexion.getConnection();
		Blob blob = null;
		byte[] logo = null;
		String sql = "SELECT LOGO FROM t_parametre LIMIT 1";
		try{rs = conn.createStatement().executeQuery(sql);
			if(rs.next())
				{blob = rs.getBlob(1);
				 logo = blob.getBytes(1,(int)blob.length());}
			rs.close();
		}catch(final SQLException e){e.printStackTrace();}
 
		System.out.println("logo");
 
		if (logo != null) 
			{response.reset();
             response.setContentType("image/gif");
             OutputStream o = response.getOutputStream();
             o.write(logo);
             o.flush();
             o.close();}
 
		try{if(conn !=null)conn.close();  conn=null;}catch(final SQLException e){}; 
		 }
}

le web.xml

Code:

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<servlet>
		<description></description>
		<display-name>logo</display-name>
		<servlet-name>logo</servlet-name>
		<servlet-class>logo.Logo</servlet-class>
		<init-param>
			<param-name>urlMain</param-name>
			<param-value>images/Logo.jsp</param-value>
		</init-param>
	</servlet>
 
	<servlet-mapping>
		<servlet-name>logo</servlet-name>
		<url-pattern>/logo</url-pattern>
	</servlet-mapping>

et dans la jsp

Code:

<img src="<%=ServletDeBase.urlBase+"logo" %>" height="150" alt="" />