一、首先描述功能以及使用的工具。

客户通过在页面输入相关的信息，比如姓名，地址，邮箱等等，并将其保存到数据库中。通过用户点击提交完成后即可在页面显示你输入的相关信息。整个程序环境有eclipse,oracle,使用语言包括java,jsp，javabean,通过这个项目熟悉在web网站上的相关操作，数据库的相关操作，以及配置tomcat服务器。 来吧，开始撸起来。

二、项目的搭建

1、先做准备环境，oracle11g数据库安装调试完毕。不懂的可以在其他博客中找到安装方法。

数据库完成之后，先创建表代码如下：

create table guests(
name varchar(10),
addr varchar(20),
email varchar(50)

)
select * from guests;

2、在eclipse中创建javaweb项目，在src下创建实体类GuestBean.java，代码如下：

package beans;

//GusetBean对应数据库的基表Guest，三个私有属性和get,set方法

public class GuestBean {

   private String name;
   private String addr;
   private String email;


   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
   public String getAddr() {
       return addr;
   }

   public void setAddr(String addr) {
       this.addr = addr;
   }
   public String getEmail() {
       return email;
   }
   public void setEmail(String email) {
       this.email = email;
   }



}

3、创建GuestDataBean.java文件，代码如下：

package beans;

import java.sql.*;
import java.util.*;

import db.DBConnection;

public class GuestDataBean extends DBConnection {
private Connection connection;
private Statement statement;

//创建连接
public GuestDataBean() throws Exception{

   connection=getConnection();
   statement=connection.createStatement();

}

//定义一个获取guest表的数组
public List< GuestBean>getGuestList() throws SQLException{
   ResultSet results=null;
   List<GuestBean> guestList =new ArrayList<GuestBean>();
   results=statement.executeQuery("select name,addr,email from guests");
   while(results.next()) {
       GuestBean guest=new GuestBean();
       guest.setName(results.getString(1));
       guest.setAddr(results.getString(2));
       guest.setEmail(results.getString(3));
       guestList.add(guest);

   }
   return guestList;

}

//插入一组数据
public int addGuest(GuestBean guest) throws SQLException{
   int result=0;
   statement=connection.createStatement();
   String sql="insert into guests(name,addr,email)values("+guest.getName()+","
   +guest.getAddr()+","+guest.getEmail()+")";
   result=statement.executeUpdate(sql);
   return result;
}

//关闭数据库，先关闭statement，在关闭connection
protected void finalize() {
   try {
       statement.close();
       connection.close();
   } catch (SQLException sqlException) {
       // TODO: handle exception
       sqlException.printStackTrace();

   }

}

}

4、建立连接数据库的DBConnection.java类，代码如下：

package db;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class DBConnection {

   static Connection conn = null;
   private static String username = "***"; //你本机数据库的用户名
   private static String password = "***";//数据库的密码
   // 加载数据库驱动
   private static String driverClassName = "oracle.jdbc.driver.OracleDriver";
   // 获取具体的数据库名地址
   private static String url = "jdbc:oracle:thin:@127.0.0.1:1521:stu1";

   // 获取数据库连接
   public static Connection getConnection() {
       try {
           Class.forName(driverClassName);
           conn = (Connection) DriverManager.getConnection(url, username, password);

       } catch (Exception e) {
           // TODO: handle exception
           e.printStackTrace();
       }
       return conn;
   }

// 关闭数据库连接
public void closeConnection() throws SQLException {

       if (conn != null) {
           try {
               conn.close();
           } catch (Exception e) {
               // TODO: handle exception
               e.printStackTrace();
           }
       }
   }

   public static void main(String[] args) {
       System.out.println(getConnection());// 加static就可以调用getConnection方法
   }

}

5、创建jsp页面 guestBookLogin.jsp（输入页面）,guestBookView.jsp（显示页面）,guestBookErrorPage.jsp（抛错页面）

//guestBookLogin.jsp

<%@ 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">

<jsp:useBean id="guest" scope="page" class="beans.GuestBean"></jsp:useBean>
<jsp:useBean id="guestData" scope="request" class="beans.GuestDataBean"></jsp:useBean>

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>输入用户信息页面</title>

table, tr, td {
   font-size: 9px;
   border: 1px groove;
   padding: 5px;
   background: #dddddd;
}
</style>

</head>
<body>
  
<jsp:setProperty property="*" name="guest" />
<% String name=request.getParameter("name");
String addr=request.getParameter("addr");
String email=request.getParameter("email");
if(name==null||addr==null||email==null){
%>

<form action="guestBookLogin.jsp" method="post">
<h1>信息栏</h1>
<p>输入客户信息</p>

<table>

<jsp:forward page="guestBookView.jsp"></jsp:forward>
<%
}
%>

</body>
</html>

//guestBookView.jsp

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>

<%@ page errorPage="guestBookErrorPage.jsp"%>
<%@ page import="java.util.*"%>
<%@ page import="beans.*"%>

<jsp:useBean id="guestData" scope="request" class="beans.GuestDataBean"></jsp:useBean>

<!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>显示页面</title>

table, tr, td, th {
   text-align: center;
   font-size: .9em;
   border: 3px groove;
   padding: 5px;
   background-color: #dddddd;
}
</style>

</head>
<body>

<p style="font-size: 3px">浏览客户信息</p>

</tr>

</thead>

           </tr>
           <%
               }
           %>

</tbody>

</table>

</body>
</html>

//guestbookErrorpage.jsp页面

<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>

<%@page isErrorPage="true"%>
<%@ page import="java.util.*"%>
<%@ page import="java.sql.*"%>
<!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>错误处理界面</title>

</head>
<body>

<p class="bigRed">显示错误信息</p>

   <p class="bigRed">
       the error message was;<br />
       <%=exception.getMessage()%>
   </p>

<p class="bigRed">please try again later</p>

</body>
</html>

以上代码都完成之后，开始把需要用的包，放入项目中，如图所示：