【javaweb】作业练习2，Servlet技术

目录

核心代码

//login.html

    
    


请登录

    用户名：

    密 码：

    

    


    ©2022 Sakurafeiyu 

//register.html

    
    


注册账号


    用户名
    密 码
    

 //registerServlet

package cn.scit.htl.Servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet(name = "registerServlet",urlPatterns = "/registerServlet")
public class registerServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        out.println("
注册成功！
");
        String uname = request.getParameter("uname");
        String upwd = request.getParameter("upwd");
        out.println("
您的个人信息，请妥善保存
");
        out.println("用户名："+uname+"
"+"密码："+upwd);
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }
}

//loginServlet

package cn.scit.htl.Servlet;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

@WebServlet(name = "welcomeServlet",urlPatterns = "/welcomeServlet")
public class welcomeServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;charset=utf-8");
        PrintWriter out = response.getWriter();
        String uname = request.getParameter("uname");
        String upwd = request.getParameter("upwd");
        if(("htl").equals(uname) && ("123456").equals(upwd)){
            out.println("
欢迎用户："+uname+"  
");
            String myProject = "/myProject";
            out.print("");
        }else{
            out.println("用户名或密码错误，请重试");
            response.sendRedirect("/myProject/login.html");

        }
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request, response);
    }
}

实现效果

首页

登录页

注册页

 

 总结与反思

• 在编写代码的过程中会有许多方法忘记，还需要加深印象；
• 注意代码编写过程中的拼写问题，注意大小写，有时候报错的问题可能不是别的，就是因为一个小小的错误，编写代码的时候一定要看仔细；
• 在配置tomcat的过程中比较曲折，IntelliJ IDEA 2021和2020好像又有所不同，在使用IDEA的过程中有点难受，配置“Edit Configurations”：
  • 配置“Edit Configurations”，有许多坑
    • name名称随便取，注意Application server，选择你安装的tomcat，路径为你所安装tomcat的根目录
    • Open browser，选择运行的浏览器，随意
    • URL，项目访问统一资源符地址，一般是在主机名后接项目名称，像这样

             

•  JRE，java运行环境，选择你所使用的jdk版本
• HTTP port，端口号默认8080，可修改
• Deployment，项目部署配置，巨坑！

如果没有tomcat，点击左边的加号，创建tomcat server

 

 

 

今天先写到这里，待续...to be continue...