基于Servlet3.0规范的一个HelloWorld
在环境Java EE 6 + GlassFish v3 + NetBeans IDE 6.8 下的一个简单的Servlet程序:
/** * * @author pylxy */@WebServlet(name="MyServlet", urlPatterns={"/MyServlet"})public class MyServlet extends HttpServlet { protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); try { out.println("<html>"); out.println("<head>"); out.println("<title>Servlet3.0 HelloWorld</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Hello! Servlet3.0规范</h1>"); out.println("</body>"); out.println("</html>"); } finally { out.close(); } } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } @Override public String getServletInfo() { return "Short description"; }}?
注解@WebServlet(name="MyServlet", urlPatterns={"/MyServlet"})，标识这一个类为Servlet类，当然这个类也要继承HttpServlet 类.name是区分不同Servlet类的一个标识，urlPatterns表示此Servlet访问的路径:? 在浏览器访问路径为
http://localhost:8080/HelloWorld/MyServlet?,输出内容为:?
Hello! Servlet3.0规范?
基于注解的方式简化了编写Servlet,提高了开发效率!
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除此之外,Servlet 3.0 规范随带了许多 web 开发新时代所需的最令人兴奋的特性!