servlet使用

1、编写一个类来继承HttpServlet
2、在新写的类中覆盖doGet()与doPost()方法，用来以自己想要的方式处理请求

import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.*;

public class Servlet1 extends HttpServlet{
    protected void doGet(HttpServletRequest rep, HttpServletResponse resp) throws IOException {
        System.out.print("doGet方法");//后台代码
        PrintWriter writer = resp.getWriter();
        writer.print("Hello,Servlet");//向前台输出效果
    }
    protected void doPost(HttpServletRequest rep, HttpServletResponse resp) throws IOException{}
}

3、注册servlet，在web.xml中写映射，一个servlet对应一个servlet-mapping ，名字（servlet-name）是用来辨识一对一关系的，一个servlet可以被多个servlet-name映射

<!DOCTYPE web-app PUBLIC
 "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
 "http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
  <display-name>Archetype Created Web Application</display-name>
  <servlet>
    <servlet-name>halloservlet</servlet-name>
    <servlet-class>Servlet1</servlet-class>
  </servlet>
  <servlet-mapping>
    <servlet-name>halloservlet</servlet-name>
    <url-pattern>/hello</url-pattern>
  </servlet-mapping>
</web-app>

本文地址：https://blog.csdn.net/kitahiragawa/article/details/112008785