创建WEB Project项目

部署tomcat、启动服务

文件名:index.html

<!DOCTYPE html>

<html>
<head>
    <meta charset='UTF-8'/>
    <title>index.html</title>
</head>

<body>
<p>作业</p>
<form action='login' method='post'>
   <p>用户名：<input type='text' name='userName'/></p>
   <p>密码：<input type='password' name='userPwd'/></p>
   <p><input type='submit' value='登录'/></p>
</form>
</body>
</html>

文件名:web.xml

<?xml version="1.0" encoding="UTF-8"?>

<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
<display-name>MyProject</display-name>
<welcome-file-list>
    <welcome-file>index.html</welcome-file>
</welcome-file-list>



<servlet>
   <servlet-name>MyServlet</servlet-name>
   <servlet-class>servlet.MyServlet</servlet-class>
</servlet>

<servlet-mapping>
   <servlet-name>MyServlet</servlet-name>
   <url-pattern>/login</url-pattern>
</servlet-mapping>

</web-app>

文件名:MyServlet.java

package servlet;

import java.io.IOException;
import java.io.PrintWriter;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* 创建一个Servlet程序
*1.继承父类HttpServlet
*2.重写请求处理方法（service,doGet,doPost）
*3.在web.xml配置文件中配置Servlet映射
*/

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public class MyServlet extends HttpServlet{
   @Override
   protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       //设置请求字符集
       request.setCharacterEncoding("UTF-8");
       //获取表单中请求的用户名和密码
       String userName=request.getParameter("userName");
       String userPwd=request.getParameter("userPwd");
       //设置响应内容及字符编码
       response.setContentType("text/html;charset=UTF-8");
       //获取响应输出流
       PrintWriter out=response.getWriter();

       out.write("<!DOCTYPE html>");
       out.write("<html>");
       out.write("   <head>");
       out.write("       <meta charset='UTF-8'>");
       out.write("       <title>欢迎页面</title>");
       out.write("   </head>");
       out.write("   <body>");
       if(userName.equals("admin")&&userPwd.equals("123")){
           out.write("       <h2>欢迎"+userName+"登录本页面</h2>");
       }
       else {
           out.write("       <h2>您输入的用户名或密码有误！</h2>");
       }
       out.write("   </body>");
       out.write("</html>");
       out.flush();
       out.close();

   }
}

创建WEB Project项目

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