How to display a blob as an image

Question

I am working on an application which stores images in a database as blobs. I need to extract these images and display them from a web page. How do I go about this using JSP or JSF?
Werner

Answer 1

Thanks for the quick response, matlas. I should have included more info in my original post. I am familiar with reading/writing blobs from the database. The part I am stuck on is how does the java servlet return the blob (dPhoto below), to the web page?
i.e. from <img src="employeePhoto.jsp&empId=123">
ImageIcon dPhoto = null;
// open connection
Connection photoConnection = startup.openSQLConnection(SQLDriver, SQLConnectionString);
// setup select string
String sqlStatement = "select Binary_Photo from employeephoto where Employee_ID = '"+employeeID+"'";
try {
// perform select
ResultSet rs = photoConnection.createStatement().executeQuery(sqlStatement);
// if record found process blob
if (rs.next()) {
// get blob
Blob image = rs.getBlob("Binary_Photo");
// setup the streams to process blob
InputStream input = image.getBinaryStream();
ByteArrayOutputStream output = new ByteArrayOutputStream();
// set read buffer size
byte[] rb = new byte[1024];
int ch = 0;
// process blob
while ((ch=input.read(rb)) != -1) {
output.write(rb, 0, ch);
// transfer to byte buffer
byte[] b = output.toByteArray();
input.close();
output.close();
// load final buffer to image icon
dPhoto = new ImageIcon(b);
catch (Exception exc) {/ do your exception processing}
// close connection
startup.closeSQLConnection(photoConnection);
// dPhoto holds image or is null at this point.