【实例】赵雅智_购物车（1）查询所有书籍
使用jsp的model2模型开发购物车（bookstore）
- 搭建开发环境
- 导入开发包：jdbc驱动 （jstl的jar）
- 创建程序所在的在mysql下创建库和表 book : id ,name, author price description
- 编码：
- 开发实体类bean ：Book
- 开发dao （创建工具类）
- 开发service
- web层
新建WEB项目
考驱动
创建包
创建表
创建数据库
创建表
添加数据
create database bookstore use bookstore create table book( id int not null primary key auto_increment, name varchar(20) unique, author varchar(20), price double, desscription varchar(40)); set character_set_client=gb2312; set character_set_results=gb2312; insert into book values(1,'java高级','李丹','32.90','很好'); insert into book values(2,'mysql数据库','张三','29.70','很好'); insert into book values(3,'c#技术详解','李四','62.40','一般般'); insert into book values(4,'Xml技术详解','Jack','45.90','很好'); insert into book values(5,'JSP详解','Tom','77.90','很好'); insert into book values(6,'Android开发应用','Daney','56.30','很好');
domin封装实体对象
package www.hbsi.domain;
public class Book {
private int id;
private String name;
private String author;
private double price;
private String desscription;
public Book() {
super();
}
public Book(int id, String name, String author, double price,
String desscription) {
super();
this.id = id;
this.name = name;
this.author = author;
this.price = price;
this.desscription = desscription;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getAuthor() {
return author;
}
public void setAuthor(String author) {
this.author = author;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public String getDesscription() {
return desscription;
}
public void setDesscription(String desscription) {
this.desscription = desscription;
}
@Override
public String toString() {
return "Book [author=" + author + ", desscription=" + desscription
+ ", id=" + id + ", name=" + name + ", price=" + price + "]";
}
}
util连接数据库
配置文件
db.properties
driver=com.mysql.jdbc.Driver url=jdbc:mysql://localhost:3306/bookstore username=root password=123456
连接数据库
package www.hbsi.util;
import java.io.IOException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Properties;
public class DBConn {
static String driver;
static String url;
static String username;
static String password;
static{
InputStream in = DBConn.class.getClassLoader().getResourceAsStream("db.properties");
Properties pro = new Properties();
try {
pro.load(in);
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
driver = pro.getProperty("driver");
url = pro.getProperty("url");
username = pro.getProperty("username");
password = pro.getProperty("password");
}
public static Connection getConnection(){
Connection conn = null;
try {
Class.forName(driver);
conn = DriverManager.getConnection(url,username,password);
} catch (ClassNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return conn;
}
public static void close(ResultSet rs, PreparedStatement ps, Connection conn){
if(rs != null){
try {
rs.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(ps != null){
try {
ps.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
if(conn != null){
try {
conn.close();
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
}
测试连接
package www.hbsi.test;
import org.junit.Test;
import www.hbsi.util.DBConn;
import junit.framework.TestCase;
public class DBConnTest extends TestCase {
@Test
public void testGetConn(){
System.out.print(DBConn.getConnection());
}
}
Dao包操作
创建dao接口
package www.hbsi.dao;
import java.util.List;
import www.hbsi.domain.Book;
public interface BookDao {
//查询所有书籍
public List<Book> getAll();
//根据ID查找书籍
public Book findById(String id);
}
实现dao接口
package www.hbsi.dao;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
import www.hbsi.util.DBConn;
import www.hbsi.domain.Book;
public class BookDaoImpl implements BookDao {
Connection conn = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
Book book;
public Book findById(String id) {
return book;
}
public List<Book> getAll() {
try {
conn = DBConn.getConnection();
String sql = "select id,name,author,price,desscription from book";
pstmt = conn.prepareStatement(sql);
rs = pstmt.executeQuery();
List<Book> list = new ArrayList<Book>();
while(rs.next()){
book = new Book();
book.setId(rs.getInt("id"));
book.setName(rs.getString("name"));
book.setAuthor(rs.getString("author"));
book.setPrice(rs.getDouble("price"));
book.setDesscription(rs.getString("desscription"));
list.add(book);
}
return list;
} catch (Exception e) {
throw new RuntimeException(e);
} finally {
DBConn.close(rs, pstmt, conn);
}
}
}
测试
package www.hbsi.test;
import java.util.List;
import org.junit.Test;
import www.hbsi.dao.BookDao;
import www.hbsi.dao.BookDaoImpl;
import www.hbsi.domain.Book;
public class DaoTest {
BookDao bd = new BookDaoImpl();
@Test
public void testQueryAll() {
List<Book> list = bd.getAll();
System.out.println("查询内容是：");
for (Book book : list) {
System.out.println("id:" + book.getId());
System.out.println("书名：" + book.getName());
System.out.println("作者：" + book.getAuthor());
System.out.println("价格：" + book.getPrice());
System.out.println("评价：" + book.getDesscription());
System.out.println(" ");
}
}
}
service业务逻辑处理
创建service接口
package www.hbsi.service;
import java.util.List;
import www.hbsi.domain.Book;
public interface BookService {
//查询所有书籍
public List<Book> getAll();
//根据ID查找书籍
public Book findById(String id);
}
实现接口
package www.hbsi.service;
import java.util.List;
import www.hbsi.dao.BookDao;
import www.hbsi.dao.BookDaoImpl;
import www.hbsi.domain.Book;
public class BookServiceImpl implements BookService {
BookDao bd = new BookDaoImpl();
public Book findById(String id) {
// TODO Auto-generated method stub
return bd.findById(id);
}
public List<Book> getAll() {
// TODO Auto-generated method stub
return bd.getAll();
}
}
servlet控制器
package www.hbsi.servlet;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.List;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import www.hbsi.domain.Book;
import www.hbsi.service.BookService;
import www.hbsi.service.BookServiceImpl;
public class GetAllServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
BookService service = new BookServiceImpl();
List<Book> list = service.getAll();
request.setAttribute("books",list);
request.getRequestDispatcher("/WEB-INF/jsp/listbook.jsp").forward(request, response);
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}
jsp显示界面
在WEB-INF下新建文件夹jsp
<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>显示所有商品</title>
</head>
<body style="text-align:center">
<h2>小书店</h2>
<table border="1" width="80%">
<tr>
<td>编号</td>
<td>书名</td>
<td>作者</td>
<td>价格</td>
<td>描述</td>
<td>操作</td>
</tr>
<c:forEach var="book" items="${books}">
<tr>
<td>${book.id}</td>
<td>${book.name}</td>
<td>${book.author}</td>
<td>${book.price}</td>
<td>${book.desscription}</td>
<td>
<a href="${pageContext.request.contextPath}/getAll.do?id=${book.id}">购买</a>
</td>
</tr>
</c:forEach>
</table>
</body>
</html>
程序运行如下：
在地址栏输入http://localhost:8080/bookstore/getAll.do
