JSP登录示例-优快云博客

本文链接：https://blog.youkuaiyun.com/zengco2009/article/details/6069948

本文介绍了一个简单的JSP登录页面示例，展示了如何使用HTML和JSP技术创建一个包含用户名和密码输入框的表单，并通过Servlet处理这些数据。此外，还提供了一些关于程序设计的观点。

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<%-- Document : index Created on : 2010-12-10, 20:48:40 Author : zend_study --%> <%@page contentType="text/html" 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"> <mce:style type="text/css"></mce:style><style type="text/css" mce_bogus="1"> #loading{ background-color: #0000ff; color:#ff0000; margin:auto; padding:5px; width:400px; height:300px; } #name { color:#00ff00; margin: auto; } #password{ margrin:auto; } </style> <title>JSP Page</title> </head> <body> <div id ="loading"> <form method="post" action="/WebApplication1/NewServlet"> <div id ="name"> username:<input type="text" name="name"></div> <div id="password"> password:<input type="password" name="password"> </div> <input type=submit value="Submit"> </form> </div> </body> </html>

/* * To change this template, choose Tools | Templates * and open the template in the editor. */ package newpackage; 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; /** * * @author zend_study */ public class NewServlet extends HttpServlet { /** * Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ String name; String password; String time; protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { response.setContentType("text/html;charset=UTF-8"); PrintWriter out = response.getWriter(); this.name = request.getParameter("name"); this.password = request.getParameter("password"); if (this.name.isEmpty() || this.password.isEmpty()) { try { out.println("<html>"); out.println("<head>"); out.println("<title>Servlet NewServlet</title>"); out.println("</head>"); out.println("<body>"); out.println("</body>"); out.println("</html>"); } finally { out.close(); } } else { java.text.SimpleDateFormat formatter = new java.text.SimpleDateFormat("yyyy-MM-dd"); java.util.Date Now = new java.util.Date(); time = formatter.format(Now); try { out.println("<html>"); out.println("<head>"); out.println("<title>Servlet NewServlet</title>"); out.println("</head>"); out.println("<body>"); out.println("<h1>Welcome to fengfan'Web <h1>"); out.println("<h1>Servlet NewServlet at " + this.name + "</h1>"); out.println("<h1>Servlet NewServlet at " + this.password + "</h1>"); out.println("<h1>ha ha ,the time is" + time + "</h1>"); out.println("</body>"); out.println("</html>"); } finally { out.close(); } } } // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code."> /** * Handles the HTTP <code>GET</code> method. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Handles the HTTP <code>POST</code> method. * @param request servlet request * @param response servlet response * @throws ServletException if a servlet-specific error occurs * @throws IOException if an I/O error occurs */ @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { processRequest(request, response); } /** * Returns a short description of the servlet. * @return a String containing servlet description */ @Override public String getServletInfo() { return "Short description"; }// </editor-fold> }

学习语言的看法，不用一本一本书看，要通过例子来练习，通过你想通过这个语言来实现你的什么想法。例如

：

你想做一个检查网络的情况的软件，这你就要好好研究这个的程序的思想和程序的设计，而对于语言，在整个程序实现的方法确定后，在决定语言用什么来写！是要代码短些，还是要代码工整写，还是要兼容性好.....

这一些都是由程序设计中决定，以及程序的由顶向下逐渐细分的细分程度.....------这个是在程序细化中实现的。