Front-end controller mode

Import javax.servlet. *;

Import javax.servlet.http. *;

Import java.io. *;

Import java.util. *;

Public class logincheck extends httpservlet {

Static Final Private String content_type = "text / html; charSet = GBK";

// Initialize Global Variables

Public void init () throws servletexception {

}

// Process the http get request

Public void doget (httpservletRequest request, httpservletResponse response) throws servletexception, ioException {

// Services with DOPOST

DOPOST (Request, Response);

}

// Process the http post request

Public void dopost (httpservletRequest request, httpservletResponse response) throws servletexception, ioException {

Response.setContentType (Content_Type);

/ / Get username and password

String ID;

String passwd;

ID = Request.getParameter ("UserName"). Trim ();

Passwd = Request.getParameter ("password"). Trim ();

/ *

Determine the legitimacy and utility of user and password (decision) DISPATCHER VIEW)

If the logic is more, it can be delivered to other controller validation (the Help View mode). Since it is just the use of the front-end controller, this is not a database :)

* /

IF (id.equals ("angss_han" && passwd.equals ("hanchen")) {

// Legal, turn to the available page

Response.sendRedirect ("Other.jsp");

}

Else

// illegally, turn to the error page, can also transfer directly to the landing page again in the actual application

// That is to say as long as it is simply returned.

Response.sendRedirect ("LoginerrorPage.jsp");

PrintWriter out = response.getwriter ();

Out.println ("");

Out.println ("