Servlet 之 HttpServlet

package cn.jiemoxiaodi.http;

import java.io.IOException;

import javax.servlet.GenericServlet;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class MyHttpServlet extends GenericServlet {

    @Override
    public void service(ServletRequest arg0, ServletResponse arg1)
            throws ServletException, IOException {
        // 如果我们确定请求的是用http协议，那么实际上ServletRequest 就是
        // HttpServletRequest 所以进行强转

        HttpServletRequest request = (HttpServletRequest) arg0;

        HttpServletResponse response = (HttpServletResponse) arg1;
        
        
        //当我们请求servlet的时候 ，如果他请求方式是get 那么他走一个doGet方法
        //当我们请求servlet时候，如果他请求方式是post  那么他走一个doPost的方法
        
        //获得 请求的 方式
        String method= request.getMethod();
        if(method.equalsIgnoreCase("get")){
            doGet(request,response);
        }else if(method.equalsIgnoreCase("post")){
            doPost(request,response);
        }
        
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) {
        System.out.println("dopost");
    }

    public void doGet(HttpServletRequest request, HttpServletResponse response) {
        System.out.println("doget");
    }

}

package cn.jiemoxiaodi.http;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class DServlet extends MyHttpServlet {

    @Override
    public void doPost(HttpServletRequest request, HttpServletResponse response) {
        System.out.println("dopost----=--");
    }

    @Override
    public void doGet(HttpServletRequest request, HttpServletResponse response) {
        System.out.println("doget----=--");
    }

}