JSP Servlet self-implementation, jspservlet implementation

JSP Servlet self-implementation, jspservlet implementation

Servlet self-implementation in JSP

Step 1

1. inherit from HttpServlet
2. Rewrite the doGet () or doPost () method.
3. Register Servlet in web. xml

2. HttpServlet class inheritance Diagram

Three instances

1. Create a MyFirstServletDemo web project.

2. Edit index. jsp

<% @ Page language = "java" import = "java. util. * "contentType =" text/html; charset = UTF-8 "%> <% String path = request. getContextPath (); String basePath = request. getScheme () + ": //" + request. getServerName () + ":" + request. getServerPort () + path + "/"; %> <! Doctype html public "-// W3C // dtd html 4.01 Transitional // EN"> 
3. Compile HelloServlet

Package servlet; import java. io. IOException; import java. io. printWriter; import javax. servlet. servletException; import javax. servlet. http. httpServlet; import javax. servlet. http. httpServletRequest; import javax. servlet. http. httpServletResponse; // inherit from HttpServletpublic class HelloServlet extends HttpServlet {@ Override protected void doGet (HttpServletRequest request, HttpServletResponse response) throws S ErvletException, IOException {// TODO Auto-generated method stub System. out. println ("processing get () requests... "); PrintWriter out = response. getWriter (); response. setContentType ("text/html; charsets = UTF-8"); out. println ("<strong> Hello Servlet! </Strong> <br> ") ;}@ Override protected void doPost (HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {System. out. println ("processing post () requests... "); PrintWriter out = response. getWriter (); response. setContentType ("text/html; charsets = UTF-8"); out. println ("<strong> Hello Servlet! </Strong> <br> ");}}
4. Compile web. xml

<?xml version="1.0" encoding="UTF-8"?><web-app version="2.5"  xmlns="http://java.sun.com/xml/ns/javaee";  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";  xsi:schemaLocation="http://java.sun.com/xml/ns/javaeehttp://java.sun.com/xml/ns/javaee/web-app_2_5.xsd";> <display-name></display-name>  <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet>  <servlet-name>HelloServlet</servlet-name>  <servlet-class>servlet.HelloServlet</servlet-class> </servlet> <servlet-mapping>   <servlet-name>HelloServlet</servlet-name>   <url-pattern>/servlet/HelloServlet</url-pattern> </servlet-mapping></web-app> 
Iv. Running results


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