自己写一个MyServlet
package com.servlet;import java.io.IOException;import javax.servlet.Servlet;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class MyServlet implements Servlet{ ???@Override ???public void destroy() { ???????// TODO Auto-generated method stub ???????????} ???@Override ???public ServletConfig getServletConfig() { ???????// TODO Auto-generated method stub ???????return servletConfig; ???} ???@Override ???public String getServletInfo() { ???????// TODO Auto-generated method stub ???????return null; ???} ???ServletConfig servletConfig; ???@Override ???public void init(ServletConfig arg0) throws ServletException { ???????// TODO Auto-generated method stub ???????servletConfig=arg0; ???????init(); ???} ???public void init() { ???????????} ???@Override ???public void service(ServletRequest request, ServletResponse response) throws ServletException, IOException { ???????// TODO Auto-generated method stub ???????????????//因为request没有getMethod()方法，所以需要他的子类 ???????HttpServletRequest req=(HttpServletRequest)request; ???????HttpServletResponse spe=(HttpServletResponse)response; ???????????????service(req,spe); ???????????????System.out.println(req.getMethod()); ???} ???//重载service，当子类重写时原来父类的不会被重写 ???public void service(HttpServletRequest request,HttpServletResponse response) { ???????//对不同的请求做不同的回应 ???????if(request.getMethod().equals("GET")) { ???????????doGet(request,response); ???????} ???????if(request.getMethod().equals("POST")){ ???????????doPost(request,response); ???????} ???} ???//增加get和post方法供子类继承 ???public void doGet(HttpServletRequest request,HttpServletResponse response) { ???????????} ???public void doPost(HttpServletRequest request,HttpServletResponse response) { ???????????}}然后用一个LoginServlet去继承MyServlet
package com.servlet;import java.io.IOException;import javax.servlet.Servlet;import javax.servlet.ServletConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class LoginServlet extends MyServlet{ ???@Override ???public void destroy() { ???????// TODO Auto-generated method stub ???????????} ???@Override ???public ServletConfig getServletConfig() { ???????// TODO Auto-generated method stub ???????return null; ???} ???@Override ???public String getServletInfo() { ???????// TODO Auto-generated method stub ???????return null; ???} ???@Override ???public void init(ServletConfig arg0) throws ServletException { ???????// TODO Auto-generated method stub ???????????} ???@Override ???public void service(ServletRequest arg0, ServletResponse arg1) throws ServletException, IOException { ???????// TODO Auto-generated method stub ???????????} ???public void doGet(HttpServletRequest request,HttpServletResponse response) { ???????System.out.println("GET"); ???} ???public void doPost(HttpServletRequest request,HttpServletResponse response) { ???????System.out.println("POST"); ???}}重写HttpServlet
原文地址：https://www.cnblogs.com/liu-ya/p/9403618.html