Servlet: Session bind listener
import java.util.HashMap;
import java.util.Map;
import javax.servlet.http.HttpSession;
import javax.servlet.http.HttpSessionBindingEvent;
import javax.servlet.http.HttpSessionBindingListener;
public class SessionBindListen implements HttpSessionBindingListener {
private Map info;
/** Creates new SessionBindListen */
public SessionBindListen() {
//zero-arg constructor
info = new HashMap();
}
public void valueBound(HttpSessionBindingEvent be) {
HttpSession session = be.getSession();
String id = session.getId();
String name = be.getName();
Object value = be.getValue();
String source = be.getSource().getClass().getName();
String message = new StringBuffer("Attribute bound to session in ")
.append(source).append("\nThe attribute name: ").append(name)
.append("\n").append("The attribute value: ").append(value)
.append("\n").append("The session id: ").append(id).toString();
System.out.println(message);
}
public void valueUnbound(HttpSessionBindingEvent be) {
HttpSession session = be.getSession();
String id = session.getId();
String name = be.getName();
if (name == null)
name = "Unknown";
String source = be.getSource().getClass().getName();
String message = new StringBuffer("Attribute unbound from session in ")
.append(source).append("\nThe attribute name: ").append(name)
.append("\n").append("The session id: ").append(id).toString();
//clear Map; send message
info.clear();
System.out.println(message + "\nThe size of the HashMap is: "
+ info.size());
}
public void addInfo(String name, String email) {
info.put(email, name);
}
}
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