顺便演示了MVC的作法，以后hello.view可以移交到jsp中处理。
而MODEL和CONTROL,VIEW就实现了分享。
HelloModel.java:
package cc.openhome; import java.util.*; public class HelloModel { private Map<String, String> messages = new HashMap<String, String>(); public HelloModel() { messages.put("caterpillar", "Hello"); messages.put("Justin", "Welcome"); messages.put("momor", "Hi"); } public String doHello(String user) { String message = messages.get(user); System.out.println(message + "@@@@@@@@@@@@@@@@@"); return message + ", " + user + "!"; } }
HelloController.java:
package cc.openhome; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet implementation class HelloController */ @WebServlet("/hello.do") public class HelloController extends HttpServlet { private static final long serialVersionUID = 1L; private HelloModel model = new HelloModel(); /** * @see HttpServlet#HttpServlet() */ public HelloController() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String name = request.getParameter("user"); String message = model.doHello(name); System.out.println(message + "$$$$$$$$$$"); request.setAttribute("message", message); request.getRequestDispatcher("hello.view").forward(request, response); } }
HelloView.java:
package cc.openhome; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; /** * Servlet implementation class HelloView */ @WebServlet("/hello.view") public class HelloView extends HttpServlet { private static final long serialVersionUID = 1L; private String htmlTemplate = "<html>" + " <head>" + " <meta http-equiv='Content-Type'" + " content='text/html; charset=UTF-8'>" + " <title>%s</title>" + " </head>" + " <body>" + " <h1>%s</h1>" + " </body>" + "</html>"; /** * @see HttpServlet#HttpServlet() */ public HelloView() { super(); // TODO Auto-generated constructor stub } /** * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response) */ protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { // TODO Auto-generated method stub String user = request.getParameter("user"); String message = (String) request.getAttribute("message"); System.out.println(user + message + "##################"); String html = String.format(htmlTemplate, user, message); response.getWriter().print(html); } }
