實現servlet的兩種方式
? 1. 繼承HttpServlet

? ? 繼承的方式一般會使用模板模式

import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import java.io.IOException;@WebServlet(name = "CommentServlet") public class CommentServlet extends HttpServlet {protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {doGet(request,response);}protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {String username = (String) request.getAttribute("username");String comments = (String) request.getAttribute("comment");//System.out.println(username);//System.out.println(comments);request.getRequestDispatcher("commentResult.jsp").forward(request,response);} }

2. 實現接口Servlet

? ?接口中的所有方法都必須實現,不管你用不用

public class DemoServlet implements Servlet {...... }

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