servlet中get和post请求的分发处理

servlet中get和post请求的分发处理

package LWB;

import javax.servlet.*;
import javax.servlet.http.HttpServletRequest;
import java.io.IOException;

public class HelloServlet implements Servlet {

    public HelloServlet() {
        System.out.println("1.构造方法");
    }

    @Override
    public void init(ServletConfig servletConfig) throws ServletException {
        System.out.println("2.init方法");
    }

    @Override
    public ServletConfig getServletConfig() {
        return null;
    }
    //service方法是专门用来处理请求和响应的
    @Override
    public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
        System.out.println("3. HelloServlet被访问了");
        //类型转换，因为HttpServletRequest类型有getMethod()方法
        HttpServletRequest httpServletRequest=(HttpServletRequest) servletRequest;
        //获取请求的方法
        String method=httpServletRequest.getMethod();
//      System.out.println(method);
        if("GET".equals(method)){
            doGet();
        }
        else if("POST".equals(method)){
            doPost();
        }

    }
    public void doGet(){
        System.out.println("get请求");
        System.out.println("get请求");
    }
    public void doPost(){
        System.out.println("post请求");
        System.out.println("post请求");
    }
    @Override
    public String getServletInfo() {
        return null;
    }

    @Override
    public void destroy() {
        System.out.println("4.destroy方法");
    }
}