Servlet实现表单提交（MyEclipse10,Tomcat7.0,JDK1.7,）——Java Web练习（一）
1.MyEclipse|File|New|Project|Web Project 填写Project Name：exServlet，点选Java EE 6.0（配套Tomcat7.0）
2.代码结构如下：
3.修改index.jsp页面，完整代码如下：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>火车票订票系统</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> <!-- 界面布局 --> <div align="center"> <div class="style"> <table width="1024" height="150" cellpadding="0" cellspacing="0" > <!-- 动态首页订票界面 同时获取年月日和动态滚动消息 --> <tr> <td colspan="2"> <img src="./images/logo.jpg" alt="logo" width="1024" height="149"> </td> </tr> <tr> <td width="205" bgcolor="#b7d7ec"> <p align="center"> <!-- 注意：方法today.getYear()已经过时，需要添加1900 --> <script language=JavaScript> today = new Date(); function initArray(){ this.length=initArray.arguments.length; for(var i=0;i<this.length;i++) this[i+1]=initArray.arguments[i]; } var d=new initArray( "星期日","星期一","星期二","星期三","星期四", "星期五","星期六"); document.write("<font color=##ff0000 style='font-size:12pt;font-family: 宋体'> ", today.getYear()+1900,"年",today.getMonth()+1,"月",today.getDate(),"日 ",d[today.getDay()+1], "</font>" ); </script> </p> </td> <td width="819" bgcolor="#b7d7ec"> <marquee direction="left" onmouseover=this.stop() onmouseout=this.start() scrollAmount=3 scrollDelay=100> <FONT style="FONT-SIZE: 18px"color=blue>欢迎使用火车票订票系统管理系统 ，如有不足，敬请指导！</FONT> </marquee> </td> </tr> </table> </div> <table width="100%" height="75%" border="0" align="center"> <tr> <td width="40%" height="20%"> </td> <td width="20%" > <!-- 中间登录部分布局 提交表单 配置web.xml --> <form action="loginAction.do"> <table width="500" height="80%" border="2" bordercolor="#12A0F5" bgcolor="#dfeaf1"> <tr> <td></td> <td align="center"><br />系统管理员登录 <br/><br/> 用户名：<input type="text" name="userid" size="19" maxlength="19" /><br/><br/> 密 码：<input type="password" name="password" size="20" maxlength="19" /><br /><br /> <input type="submit" name="Submit" value="登录"/> <input type="reset" name="Submit" value="重置" /><br/> </td> <td></td> </tr> </table> </form> </td> <td width="40%"></td> </tr> <tr><td height="67" colspan="3"> <!-- 底部版权所有界面 --> <TABLE class=wrapper border=0 cellSpacing=0 cellPadding=0 width="100%" align=center> <TBODY> <TR> <TD style="LINE-HEIGHT: 150%" align="center"> <HR style="WIDTH: 96%; HEIGHT: 4px; COLOR: #02457c"> <font size="2"> <SCRIPT language=javascript src=""></SCRIPT> <!-- target=_blank开启新的网页 --> <BR><A href="aboutme.jsp" target=_blank>关于我们</A> | <A href="wzsm.jsp">网站声明</A> <BR>版权所有©2014-2015 北京理工大学 Eastmount <BR>京ICP备10009636号 </font> </TD> </TR> </TBODY> </TABLE> </td> </tr> </table> </div> </body> </html>
4.新建图片、样式文件夹，并导入图片，书写样式文件代码，代码如下：
.main { width: 1024px; text-align:left; } .font { font-family: "Trebuchet MS"; font-size: 14px; font-weight: bold; color: #FFFFFF; } .div { margin: 0px; padding: 0px; width: 1014px; } .tdBgColor{ background-color:#6b1101; } a{ font-family: "Trebuchet MS"; font-size: 14px; font-weight: bold; color: #FFFFFF; line-height:50px; text-decoration:none; } a.hover{ font-family: "Trebuchet MS"; font-size:14px; font-weight: bold; color:#0000FF; line-height:50px; text-decoration:underline; padding-bottom:1px; } a.visited{ font-family: "Trebuchet MS"; font-size:14px; font-weight: bold; color:#000066; line-height:50px; text-decoration:none; } a.active{ font-family: "Trebuchet MS"; font-size:14px; font-weight: bold; color:#0000FF; line-height:50px; text-decoration:none; padding-bottom:1px; }
5.新建package、java代码文件（此处即为Servlet），代码如下：
package servlet; import java.io.IOException; import java.sql.*; //导入数据库处理所有库 import javax.servlet.ServletConfig; import javax.servlet.ServletException; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.swing.JOptionPane; //用户登录处理Servlet 系统登录主页处理表单 public class HomePageAction extends HttpServlet { private Connection cn=null; //定义数据库连接对象 private String driverName=null; //数据库驱动器 private String url=null; //数据库地址URL //初始化方法，取得数据库连接对象 public void init(ServletConfig config) throws ServletException { super.init(config); driverName=config.getInitParameter("driverName"); url=config.getInitParameter("url"); try { Class.forName(driverName); cn=DriverManager.getConnection(url); } catch(Exception e) { System.out.println("取得数据库连接错误："+e.getMessage()); } } //处理GET请求方法 public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //取得用户注册表单提交的数据 String userid=request.getParameter("userid"); String password=request.getParameter("password"); //判断登录账号为空，则自动跳转到注册页面 if(userid==null||userid.trim().length()==0) { response.sendRedirect("index.jsp"); JOptionPane.showMessageDialog(null, "User name or password can't be empty!"); } //判断登录密码为空 if(password==null||password.trim().length()==0) { response.sendRedirect("index.jsp"); JOptionPane.showMessageDialog(null, "User name or password can't be empty!"); } //查询数据库和跳转到登录主界面 try { //查询数据库操作 //跳转到主界面 response.sendRedirect("success.jsp"); } catch(Exception e) { System.out.println("错误："+e.getMessage()); response.sendRedirect("index.jsp"); } } //处理POST请求方法 public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { doGet(request,response); } //销毁方法 public void destroy() { super.destroy(); try { cn.close(); }catch(Exception e) { System.out.println("关闭数据库错误："+e.getMessage()); } } }
6.修改配置文件web.xml，使index.jsp页面可以定位到java文件（Servlet），代码如下：（主要是<servlet>标签和<servlet-mapping>标签，其他标签无关紧要）
<?xml version="1.0" encoding="UTF-8"?> <web-app version="3.0" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd"> <display-name></display-name> <welcome-file-list> <welcome-file>index.jsp</welcome-file> </welcome-file-list> <servlet> <servlet-name>HomePageAction</servlet-name> <servlet-class>servlet.HomePageAction</servlet-class> <init-param> <param-name>driveName</param-name> <param-value>sun.jdbc.odbc.JdbcOdbcDriver</param-value> </init-param> <init-param> <param-name>url</param-name> <param-value>jdbc:odbc:cityoa</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>HomePageAction</servlet-name> <url-pattern>/loginAction.do</url-pattern> </servlet-mapping> </web-app>
7.新建Servlet调用的返回页面success.jsp，代码如下：
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>验证成功界面</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page"> <!-- <link rel="stylesheet" type="text/css" href="styles.css"> --> </head> <body> 界面表单提交跳转成功 <br> <a href="index.jsp">返回</a> </body> </html>
8.效果图：
返回界面：
总结调用路径：
引用出处：http://www.bkjia.com/ASPjc/995763.html
