如何通过Servlet实现方式调整属性设置？

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java@WebServlet(/myservlet)public class MyServlet extends HttpServlet { public MyServlet() { System.out.println(实例化了： + this); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException { // 处理GET请求 }}

extends HttpServlet

@WebServlet("/myservlet") public class MyServlet extends HttpServlet { public MyServlet(){ System.out.println("实例化了："+this); } public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { request.setAttribute("msg", "用户名不存在");//设置属性 request.getAttribute("msg");//获取属性 request.getAttributeNames();//获取属性名字集合 //响应重定向 // response.sendRedirect(request.getContextPath()+"/login-fail.jsp"); //请求转发 request.getRequestDispatcher("/login-fail.jsp").forward(request, response); System.out.println("doGet:"+this); response.setContentType("text/html"); PrintWriter out = response.getWriter(); out.println(""); out.println(""); out.println(" "); out.println(" "); out.print(" This is "); out.print(this.getClass()); out.println(", using the GET method"); out.println(" "); out.println(""); out.flush(); out.close(); } } implements Servlet

@WebServlet("/myservlet") public class MyServlet implements Servlet { @Override public void destroy() {} @Override public ServletConfig getServletConfig() { return null; } @Override public String getServletInfo() { return null; } @Override public void init(ServletConfig servletConfig) throws ServletException {} @Override public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException { } } extends GenericServlet

@WebServlet("/myservlet") public class MyServlet extends GenericServlet { @Override public void service(ServletRequest arg0, ServletResponse arg1) throws ServletException, IOException { System.out.println(this.getServletConfig().getInitParameter("systemName")); System.out.println(this.getInitParameter("systemName")); System.out.println("service:"+this); } }