Servlet实现静态验证

一、什么是Servlet?

　　Servlet是Service applet ，也就是安装在服务器的小程序。在Java web b/s架构中，servlet扮演了重要的角色，作为一个中转处理的容器，他连接了客户端和服务器端的信息交互和处理。简单来说，客户端发送请求，传递到servlet容器，而servlet将数据转换成服务器端可以处理的数据再发送给服务器端，再数据处理之后，再传递到servlet容器，servlet再转译到客户端，完成了一次客户端和服务器端的信息交互。

二、简单的Servlet与jsp的交互(servlet接收jsp传来的数据,并显示)：

login.jsp：

servlet:

<%@ page language="java" contentType="text/html; charset=utf-8"
    pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>登录</title>
</head>
<body>
    <form action="${pageContext.request.contextPath }/User_reponse_servlet" method="post">
        name:<input type="text" name="name" /><br/>
        password:<input type="text" name="password"/><br/>
        <input type="submit" value="提交"><br/>
    </form>
</body>
</html>

 

package servlet_test;

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

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 javafx.scene.control.Alert;

/**
 * Servlet implementation class User_reponse_servlet
 */
@WebServlet("/User_reponse_servlet")
public class User_reponse_servlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public User_reponse_servlet() {
        super();
        // TODO Auto-generated constructor stub
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        response.setContentType("text/html;setchar=utf-8");
        request.setCharacterEncoding("utf-8");
        PrintWriter out = response.getWriter();
        String name = (String)(request.getParameter("name"));
        String pwd = (String)(request.getParameter("password"));
        out.println("user:"+name);
        out.println("password:"+pwd);
        
        
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
    }

}

效果图:

 

链接：https://pan.baidu.com/s/1ikgHD1L4iQ3uW9fjMB8XxA
提取码：q2z9

posted @ 2019-03-22 11:46  123gogo  阅读(356)  评论(1)  编辑  收藏  举报