HttpSession interface - how to get the type of interface objects
The Servlet API defined HttpSession interface, used to package the session object.
HttpSession is the interface, the object can not directly create new new, created session object is a container, a session object is to use the HttpServletRequest.
- public HttpSession getSession (): Gets the current request associated with the session, if the session does not exist, create a new session object is returned.
- public HttpSession getSession (boolean create): create If the parameter is true, the method is not equivalent to getSession argument. If the value of the parameter is create false, then if the session object associated with the current request does not exist, then return null, if present, directly back session object.
JSP file using the session object's methods - JSP file has built-in object session, you can call any method HttpSession interface directly
HttpSession interface methods defined
HttpSession interface defines a set of methods
| No. | name | Brief introduction | Brief introduction |
|---|---|---|---|
| 01 | void | setAttribute(String key,Object value) | Object value stored in the form of key / value of. |
| 02 | Object | getAttribute(String key) | Gets an object value by key. |
| 03 | void | removeAttribute(String key) | Delete property by key. |