动态生成页面（从数据库中动态取出数据信息生成页面）
2015-07-05 09:39
579 查看
做课程设计的时候 做的有点烦了 所以就简单的写了点 以下就是将添加到购物车的商品动态的显示到前台页面的代码首先是我的head.jsp这里面的“我的目录“使用的不是直接链接而是一个servlet名称叫做”selectUserCart“我的里面使用的user、books、userAccout类都是基本的记录了基本信息的类为其实现setXxx（）和getXxx（）方法
<%@ 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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body >
<div id="wrap" >
<%
if(session.getAttribute("username") == null) {
%>
<br/>你还没有登录请<a href="login.jsp">登陆</a>/<a href="register.jsp">注册</a>以查看或购买
<%
}else{
%>
<br/>您好！<%=session.getAttribute("username") %>
<%
}
%>
<div class="header">
<!-- <br/>你还没有登录请<a href="login.jsp">登陆</a>/<a href="register.jsp">注册</a>以查看或购买 -->
<div class="logo"><a href="index.htm"><img src="images/logo.gif" alt="" title="" border="0" /></a></div>
<div id="menu">
<ul>
<li class="selected"><a href="index.jsp">主页</a></li>
<li><a href="about.jsp">关于我们</a></li>
<li><a href="category">图书</a></li>
<li><a href="specials.jsp">特别推荐</a></li>
<li><a href="selectUserCart">我的目录</a></li>
<li><a href="register.jsp">注册</a></li>
<li><a href="contact.jsp">购买</a></li>
</ul>
</div>
</div>
</div>
</body>
</html>然后是我使用到的两个类：
搜索我的购物车的工具类：myCartUtil.java
<pre name="code" class="java">package myCart;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import bookConnUtil.DBUtil;
import bookConnUtil.books;
public class myCartUtil {
public static ArrayList<mycart> list = new ArrayList<mycart>();
public static ArrayList<books> booklist = new ArrayList<books>();
public static String msg;
public static int countbook = 0;
//public static mycart[] cart = new mycart[10];
public static int count = 0;
public static boolean insertIntoMyCart(String username,String bookname,String pianduanName) throws SQLException{
String cartInsert = "insert into userAccount valus(?,?,?)";
boolean flag = false;
Connection conn=null;
PreparedStatement stmt=null;
try{
conn = DBUtil.getConnection(DBUtil.CONNECTION_SQL);
stmt = conn.prepareStatement(cartInsert);
stmt.setString(1, username);
stmt.setString(2, bookname);
stmt.setString(3, pianduanName);
int count = stmt.executeUpdate();
if(count>0){
flag=true;
}else{
flag=false;
}
}catch(Exception e){
System.out.println("真心对不住，您的程序出错了");
e.printStackTrace();
}finally{
conn.close();
stmt.close();
}
return flag;
}
public static boolean selectUserCart(String userName) throws SQLException{
boolean flag = false;
String cartSelect = "select username,bookname,pianduanName,imagePath,price from userAccount where username =?";
Connection conn=null;
ResultSet rs=null;
PreparedStatement stmt=null;
try{
conn = DBUtil.getConnection(DBUtil.CONNECTION_SQL);
stmt = conn.prepareStatement(cartSelect);
stmt.setString(1, userName);
rs = stmt.executeQuery();
while(rs.next()){
mycart cart = new mycart();
cart.setUserName(rs.getString(1));
cart.setBookName(rs.getString(2));
cart.setPianduanName(rs.getString(3));
cart.setImagePath(rs.getString(4));
cart.setPrice(rs.getInt(5));
list.add(cart);
count++;
}
System.out.println("++++++++++++++++"+count+"+++++++++++++");
if(count==0){
msg = "null";
}else{
msg = "full";
}
flag = true;
}catch(Exception e){
System.out.println("真心对不起，你的程序出错了");
e.printStackTrace();
}finally{
conn.close();
stmt.close();
}
return flag ;
}
public static boolean selectAllBooks() throws SQLException{
boolean flag = false;
String cartSelect = "select bookId,bookName,pianduanName,imagesPath,price from books";
Connection conn=null;
ResultSet rs=null;
PreparedStatement stmt=null;
try{
conn = DBUtil.getConnection(DBUtil.CONNECTION_SQL);
stmt = conn.prepareStatement(cartSelect);
rs = stmt.executeQuery();
while(rs.next()){
books book = new books();
book.setBookID(rs.getString(1));
book.setBookName(rs.getString(2));
book.setPianduanName(rs.getString(3));
book.setImagePath(rs.getString(4));
book.setPrice(rs.getInt(5));
booklist.add(book);<span style="white-space:pre"> </span>//我没怎么好好做所以就用这个标记的 想要做的更好点请自行实现
countbook++;
}
System.out.println("++++++++++++++++"+count+"+++++++++++++");
if(count==0){
msg = "null";
}else{
msg = "full";
}
flag = true;
}catch(Exception e){
System.out.println("真心对不起，你的程序出错了");
e.printStackTrace();
}finally{
conn.close();
stmt.close();
}
return flag ;
}
}下面是实现数据库连接类：<pre name="code" class="java">package bookConnUtil;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class DBUtil {
public static final int CONNECTION_MYSQL=2;
public static final int CONNECTION_SQL=1;
public static final int CONNECTION_ODBC=0;
public DBUtil() { }
public static Connection getConnection(int connection_type)throws Exception
{
switch (connection_type)
{
case CONNECTION_ODBC:
return getConnectionODBC();
case CONNECTION_SQL:
return getConnectionSQL();
case CONNECTION_MYSQL:
return getConnectionMYSQL();
}
return null;
}
/**
* �ر����Ӷ���
*/
private static Connection getConnectionODBC()throws Exception
{
Connection conn=null;
try
{
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
System.out.println("abc");
conn=DriverManager.getConnection("jdbc:odbc:mybook","sa","123");
System.out.println("连接成功");
}
catch(Exception e)
{
e.printStackTrace();
throw e;
}
return conn;
}
private static Connection getConnectionSQL() throws Exception
{
Connection conn=null;
String connectionUrl = "jdbc:sqlserver://localhost:1433;databaseName=user;";
try
{
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
conn=DriverManager.getConnection(connectionUrl,"sa","123");
System.out.println("连接成功");
}
catch(Exception e)
{
e.printStackTrace();
throw e;
}
return conn;
}
private static Connection getConnectionMYSQL() throws Exception
{
String connectionUrl = "jdbc:mysql://localhost:3306/user";
String username = "root";
String password = "mysql";
Connection conn=null;
try
{
Class.forName("com.mysql.jdbc.Driver");
conn=DriverManager.getConnection(connectionUrl, username,password);
System.out.println("连接成功");
}
catch(Exception e)
{
e.printStackTrace();
throw e;
}
return conn;
}
public static void close(Connection conn) throws Exception
{
if(conn!=null)
{
try
{
conn.close();
}
catch(SQLException e)
{
e.printStackTrace();
throw e;
}
}
}
}下面是实现用户购物车搜索类：<pre name="code" class="java">package myCart;
import java.io.IOException;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import bookConnUtil.bookDAO;
public class selectUserCart extends HttpServlet {
/**
*
*/
private static final long serialVersionUID = 1L;
public int count = myCartUtil.count;
protected void doGet(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// TODO Auto-generated method stub
HttpSession session=req.getSession();
String username =(String) session.getAttribute("username");
try {
//System.out.println("还没执行到查询过程这里");
boolean flag=myCartUtil.selectUserCart(username);
if(flag==true){
/*for(mycart message:myCartUtil.list){
for(int i=0;i<3;i++){
String A = message.getUserName();
}
}*/
//session.setAttribute("count",countNum);
if(myCartUtil.msg.equals("null")){
session.setAttribute("null", myCartUtil.msg);
}else{
session.setAttribute("full", myCartUtil.msg);
}
req.getRequestDispatcher("selectMyAcccount.jsp").forward(req, resp);
}else{
req.getRequestDispatcher("error.html").forward(req, resp);
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}我的目录实现代码：<pre name="code" class="html"><%@ 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%>">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Book Store</title>
<link rel="stylesheet" type="text/css" href="style.css" />
</head>
<body onload="selectUserCart">
<jsp:include page="head.jsp"/>
<div id="wrap">
<div class="center_content">
<div class="left_content">
<%
if(session.getAttribute("username") == null) {
%>
<script type="text/javascript" language="javascript">
alert("您还没有登录，请登录...");
window.document.location.href="login.jsp";
</script>
<%
}
%>
<div class="title"><span class="title_icon"><img src="images/bullet1.gif" alt="" title="" /></span>My account</div>
<div class="feat_prod_box_details">
<p class="details"> 我还没有什么时间进行修改，所以使用的是以前的版本这样的话造成的不便请您谅解。所有权为作者所有我还没有什么时间进行修改，所以使用的是以前的版本这样的话造成的不便请您谅解。所有权为作者所有我还没有什么时间进行修改，所以使用的是以前的版本这样的话造成的不便请您谅解。所有权为作者所有我还没有什么时间进行修改，所以使用的是以前的版本这样的话造成的不便请您谅解。所有权为作者所有 </p>
<div class="contact_form">
<div class="form_subtitle">登陆 以查看清单</div>
<form name="register" method="post" action="UserDAO">
<div class="form_row">
<label class="contact"><strong>用户名:</strong></label>
<input type="text" class="contact_input" name="userName" />
</div>
<div class="form_row">
<label class="contact"><strong>密 码:</strong></label>
<input type="password" class="con tact_input" name="password" />
</div>
<div class="form_row">
<div class="terms">
<input type="checkbox" name="terms" />
记住密码 </div>
</div>
<div class="form_row">
<input type="submit" class="register" value="登陆" />
</div>
</form>
</div>
<div class="contact_form">
<div class="form_subtitle">更新书籍信息</div>
<form name="updateBookMsg" method="post" action="updateBookMsg">
<div class="form_row">
<label class="contact"><strong>图 书ID:</strong></label>
<input type="text" class="contact_input" name="bookId" />
</div>
<div class="form_row">
<label class="contact"><strong>图 书 名:</strong></label>
<input type="text" class="contact_input" name="bookName" />
</div>
<div class="form_row">
<label class="contact"><strong>图书简介:</strong></label>
<input type="text" class="contact_input" name="pianduanName" />
</div>
<div class="form_row">
<input type="submit" class="register" value="提交" />
</div>
</form>
</div>
</div>
<div class="clear"></div>
</div>
<jsp:include page="broadside.jsp"/>
</div>
</div>
</body>
</html>
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