1. 安装TomCat
2. 了解Web项目结构

1. 如何创建Web项目：https://www.bilibili.com/video/BV1Qf4y1T7Hx?
2. 快速入门Servlet

1. Servlet生命周期

// 当用户第一次访问时调用
public void init(ServletConfig servletConfig) throws ServletException {
    System.out.println("init....");
}
// 当用户访问时调用
public void service(ServletRequest servletRequest, ServletResponse servletResponse) throws ServletException, IOException {
    System.out.println("service");
}
// 当服务器关闭时调用
public void destroy() {
    System.out.println("destory");
}

1. 体系结构

如果追求更少的代码，只需要继承HttpServlet就行了，下面是简单实例

@WebServlet("/demo3")
public class ServletDemo3 extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("Get ...");
    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("Post ...");
    }
}

1. 路由配置

1. Request信息

1. Request不管是GET还是POST都有通用的取值方式

• POST解决乱码：request.setCharacterEncoding("UTF-8");
• GET解决乱码：