The HTTP request is divided into two types, get, and post, in the servlet, there is a doget () and dopost () method, the service () method is used to be responsible for the dispatch of these two methods.
* Environment configuration required to run servlet
The servlet container, which is used here is Apache Tomcat4.0.3, JDK1.4.2. When compiled, servlet. *, Servlet.http. * Can't find it, then copy the tomcat directory /common/lib/servlet.jar to JDK directory / jre / lib / ext, and in ClassPath You can register.
* The easiest servlet // hello.javaimport java.io. *; Import javax.servlet. *; Import javax.servlet.http. *;
public class Hello extends HttpServlet {public void doGet (HttpServletRequest req, HttpServletResponse res) throws IOException, ServletException {res.setContentType ( "text / html"); PrintWriter out = req.getWriter (); out.println ( "" ); Out.println ("
Hello </ Title> </ head>"); out.println ("<body> <h1> hello </ h1> </ body>"); OUT. Println ("</ html>");}}</p>
<p>Web.xml Description: <web-app> <servlet> <servlet-name> Hello </ servlet-name> <servlet-class> Hello </ servlet-class> </ servlet> <servlet-maping> <servlet-name > Hello </ server-name> <url-pattern> / servlet / hello </ url-pattern> </ servlet-maping> </ web-app> Note: The order in which elements in web.xml do not write wrong .web. XML is placed under the web-inflicity, and the class file is placed under Web-INF / CLASSES.</p>
<p>* The above servlet can only receive the GET request, add the receiving POST request function // Add the following method public dopost (httpservletRequest Req, httpservletRequest Req, httpservletResponse res) throws ioException, servletexception {doget (REQ, RES); // Call doget method}</p></div><div class="text-center mt-3 text-grey">
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