JAVA-EE使用注解式开发代替xml配置------计算机网络经典

川长思鸟来 2024-02-22 08:55 24阅读 0赞

>     package com.powernode.javaweb.servlet;
>     
>     import jakarta.servlet.Servlet;
>     import jakarta.servlet.ServletException;
>     import jakarta.servlet.annotation.WebInitParam;
>     import jakarta.servlet.annotation.WebServlet;
>     import jakarta.servlet.http.HttpServlet;
>     import jakarta.servlet.http.HttpServletRequest;
>     import jakarta.servlet.http.HttpServletResponse;
>     
>     import java.io.IOException;
>     import java.io.PrintWriter;
>     
>     //loadOnStartup启动时创建对象<loadOnStartup = 1>
>     @WebServlet(name = "Hello",urlPatterns = {"/Hello1","/Hello2"},loadOnStartup = 1,
>     initParams = {@WebInitParam(name = "user",value = "root"),@WebInitParam(name = "password",value = "abc123"),
>             @WebInitParam(name = "driver",value = "com.mysql.jdbc.Driver")})
>     public class HelloServlet extends HttpServlet
>     {
>         public HelloServlet() {
>             System.out.println("Hello启动!");
>         }
>     
>         @Override
>         protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             //获取Servlet名字
>             String servletName = getServletName();
>             response.setContentType("text/html;charset=UTF-8");
>             PrintWriter out = response.getWriter();
>             out.println(servletName);
>             out.println("<br>");
>             out.println(request.getServletPath());
>         }
>     }
> 
>     package com.powernode.javaweb.servlet;
>     
>     import jakarta.servlet.Servlet;
>     import jakarta.servlet.ServletException;
>     import jakarta.servlet.annotation.WebInitParam;
>     import jakarta.servlet.annotation.WebServlet;
>     import jakarta.servlet.http.HttpServlet;
>     import jakarta.servlet.http.HttpServletRequest;
>     import jakarta.servlet.http.HttpServletResponse;
>     
>     import java.io.IOException;
>     import java.io.PrintWriter;
>     
>     //loadOnStartup启动时创建对象<loadOnStartup = 1>
>     @WebServlet(name = "Hello",urlPatterns = {"/Hello1","/Hello2"},loadOnStartup = 1,
>     initParams = {@WebInitParam(name = "user",value = "root"),@WebInitParam(name = "password",value = "abc123"),
>             @WebInitParam(name = "driver",value = "com.mysql.jdbc.Driver")})
>     public class HelloServlet extends HttpServlet
>     {
>         public HelloServlet() {
>             System.out.println("Hello启动!");
>         }
>     
>         @Override
>         protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
>         {
>             //获取Servlet名字
>             String servletName = getServletName();
>             response.setContentType("text/html;charset=UTF-8");
>             PrintWriter out = response.getWriter();
>             out.println(servletName);
>             out.println("<br>");
>             out.println(request.getServletPath());
>         }
>     }