This class gave some of the SERVET some foundation knowledge! ! 2. When writing the servlet using JCREATOR, you need to import Tomcat, common / lib / servlet.jar can call the servlet package 3. Test program, or practice from the simplest Hello, World!! Code: import javax.servlet *;. import java.io. *; public class HelloServlet extends GenericServlet {// First object class should override service public void service (ServletRequest request, ServletResponse response) throws IOExcetpion {PrintWriter out = response.getWriter (); out.println ( "Hello, this is our world!");}} 4.HttpServlet inherited GenericServlet, HttpServletRequest / HttpServletResponse inherited ServletRequest / ServletResponse method was getHeader header information request.getHeader ( "connection") to obtain connection information request .getHeader ("User-Agent") Get User Information Example: Import Javax.Servlet. *; Import Java.io. *; Import Javax.Servlet.http. *; // Must import this package to use httpservlet public class helloservlet Extends httpservlet {// need to reload as First Class service public void service (HttpServletRequest request, HttpServletResponse response) throws IOExcetpion {PrintWriter out = response.getWriter (); String s = request.getHeader ( "Connection"); String user = request.getHeader ("User-agent"); Out.Println ("You Connect to Server IS" S); out.close ();}} 5.Response.setContentType ("text / html; charSet = GB2312")
