Tomcat learning notes

◎ When using the start method under Tomcat Bin, there is no debugging information, and the DOS window closes the RUN method under Tomcat BIN, there is an error in Tomcat, and there will be any debugging information, and the DOS window ◎ still open ServletContext can be obtained by a process getServletContext httpservletrequest then obtained by getRequestDispatcher servletcontext RequestDispatch objects through the object such that the forward current servlet is to control or to other jsp servlet // forward using the specific code: public void doPost (HttpservletRequest Request, httpservletresponse response) throws servletexception, ioException {

// Get the username from the request.getParameter ("username"); // get the password from the request.getParameter ("password");

// Add the user to the request requirements.setttribute ("user", username); Request.SetAttribute ("password", password);

// forward the request to the target named servletcontext context = getServletContext ();

System.out.println ( "Redirecting to" target); RequestDispatcher dispatcher = context.getRequestDispatcher (target); dispatcher.forward (request, response);} procedure: httpservletrequest-> servletContext-> taglib a development instance RequestDispatcher ◎ 1 . Define Taglib2. Define JSP TAG3. Taglib statement 4 is defined in the web.xml file. Define Tag file 1.package mypack; import javax.servlet.jsp.jspexception; import javax.servlet.jsp.jsptagexception; import javax.servlet.jsp.tagext.tagsupport;

Public class hellotag extends tagsupport {public hellotag () {

}

//Method caled when closing hello tag is encountered public int doendtag () throws jspexception {

Try {

// we use the pagecontext to get a writer // we thrint The text string hello pagecontext.get (). Print ("Hello");} catch (Exception E) {

Throw new jsptagexception (E.GETMESSAGE ());} // We want to return Skip_body Because this Tag does not support // a tag body return skip_body;} public void release () {

// Call The Parent's Release To Release Any Resources // Used by The Parent Tag. // This Is Just Good Practice for When You Start Creating // Hierarchies of Tags. Super.Release ();}}

2. <% @ Taglib URI = "/ MyTaglib" prefix = "mm"%>