hengdu-cyber/BookStore

#书城

##系统环境

Eclipse Neno + JDK1.8 + Tomcat8.5 + MySQL5.7
Eclipse Neno + JDK1.7 + Tomcat7.0 + MySQL5.7

###数据库表创建 create database bookStore; use bookStore; ###用户表 CREATE TABLE user ( id INT(11) AUTO_INCREMENT, username VARCHAR(20) , PASSWORD VARCHAR(20) , gender VARCHAR(10) , email VARCHAR(50) , telephone VARCHAR(20) , introduce VARCHAR(100), activeCode VARCHAR(50) , state INT(11) , role VARCHAR(10) DEFAULT '普通用户', registTime TIMESTAMP , PRIMARY KEY (id) );

###商品表 CREATE TABLE products ( id VARCHAR(100) , name VARCHAR(40) , price DOUBLE , category VARCHAR(40) , pnum INT(11) , imgurl VARCHAR(100) , description VARCHAR(255) , PRIMARY KEY (id) ); ###订单表 CREATE TABLE orders ( id VARCHAR(100) , money DOUBLE , receiverAddress VARCHAR(255) , receiverName VARCHAR(20) , receiverPhone VARCHAR(20) , paystate INT(11) , ordertime TIMESTAMP , user_id INT(11) , PRIMARY KEY (id), FOREIGN KEY (user_id) REFERENCES user (id) );

###订单详情表 CREATE TABLE orderitem ( order_id VARCHAR(100) , product_id VARCHAR(100), buynum INT(11) , PRIMARY KEY (order_id,product_id), FOREIGN KEY (order_id) REFERENCES orders (id), FOREIGN KEY (product_id) REFERENCES products (id) );

##包的划分

按照JavaEE 三层结构
Java EE（Java Platform，Enterprise Edition）是sun公司（2009年4月20日甲骨文将其收购）推出的企业级应用程序版本。这个版本以前称为 J2EE。
模型：domain,model,pojo,po,entity

##jar包的导入

导入mysql驱动
导入c3p0
导入dbutils
导入beanutils
导入fileupload
导入javamail mail.jar
导入jstl jstl.jar standard.jar

页面导入

##用户模块 ###用户注册

##步骤

Step1: User模型

  public class User {
      private int id; // 用户编号
      private String username; // 用户姓名
      private String password; // 用户密码
      private String gender; // 用户性别
      private String email; // 用户邮箱
      private String telephone; // 用户联系电话
      private String introduce; // 用户介绍
      private String activeCode; // 激活码
      private String role; // 用户角色
      private int state; // 用户状态
      private Date registTime;// 注册时间
  }

Step2:接收请求参数

Step3:添加请求编码的Filter public class MyEncodingFilter implements Filter{

  @Override
  public void init(FilterConfig filterConfig) throws ServletException {}
  @Override
  public void destroy() {}
  
  @Override
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
          throws IOException, ServletException {
      //1.设置POST请求中文乱码的问题
      request.setCharacterEncoding("UTF-8");
      System.out.println("拦截请求:" + request);
      
      //2.解决get请求的中文乱码问题
      //request ： RequestFacade;
      HttpServletRequest hsr = (HttpServletRequest)request;
      if(hsr.getMethod().equalsIgnoreCase("get")){
          MyRequest myRequest = new MyRequest(hsr);
          //放行请求
          chain.doFilter(myRequest, response);
      }else{
          chain.doFilter(request, response);
      }
  
      
  }

} /**

Wrapper包装类，装饰设计模式,内部有个真实对象的引用
@author gyf

*/ class MyRequest extends HttpServletRequestWrapper{

  private HttpServletRequest request;
  private boolean isEncoding = false;//是否已经utf-8编码
  public MyRequest(HttpServletRequest request) {
      super(request);
      this.request = request;
  }
  
  @Override
  public String getParameter(String name) {
      return getParameterMap().get(name)[0];
  }
  
  @Override
  public Map<String, String[]> getParameterMap() {
      Map<String, String[]> map = request.getParameterMap();
      
      if(isEncoding == true){
          return map;
      }
      
      //遍历vlaue，改成utf-8编码
      for(Entry<String, String[]>  entry : map.entrySet()){
          //取数组值
          String[] values = entry.getValue();
          for(int i=0;i<values.length;i++){
               try {
                   values[i] = new String(values[i].getBytes("ISO-8859-1"),"UTF-8");
               } catch (UnsupportedEncodingException e) {
                  // TODO Auto-generated catch block
                  e.printStackTrace();
              }
          }
      }
      isEncoding = true;
      
      return map;
  }

}

Step4:配置C3P0 c3p0-config.xml 文件放在src中

com.mysql.jdbc.Driver jdbc:mysql://localhost:3306/bookstore root 123456 10

      <!--最大空闲时间,60秒内未使用则连接被丢弃。若为0则永不丢弃。Default: 0 -->
      <property name="maxIdleTime">60</property>

      <!--连接池中保留的最大连接数。Default: 15 -->
      <property name="maxPoolSize">25</property>
      
      <!--连接池中保留的 最小连接数 -->
      <property name="minPoolSize">10</property>
  </default-config>

C3P0Uitls.java 【copy以前的即可】 public class C3P0Utils {

  private static DataSource ds  = new ComboPooledDataSource();
  public static DataSource getDataSource(){
      return ds;
  }
  public static Connection getConnection(){
      try {
          return ds.getConnection();
      } catch (SQLException e) {
          // TODO Auto-generated catch block
          throw new RuntimeException("服务器错误");
      }
  }
  public static void closeAll(Connection conn,Statement statement,ResultSet resultSet){
      if(resultSet != null){
          try {
              resultSet.close();
          } catch (SQLException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }
          resultSet = null;
      }
      if(statement != null){
          try {
              statement.close();
          } catch (SQLException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
          }
          statement = null;
      }
      if(conn != null){
          try {
              conn.close();
          } catch (SQLException e) {
              // TODO Auto-generated catch block
              e.printStackTrace();
              conn = null;
          }
      }
  }

}

Step5:添加Service和Dao
```
  UserDao.java
   
  UserService
```

Step6:修改RegisterServlet逻辑

   SQL修改username性一:alter table user add constraint username_uq unique (username);

Step7:验证码

把CheckImgServlet添加到项目中，讲解下原理

在Register前面添加验证码

##激活邮件的发送 ###smtp与pop3

SMTP（Simple Mail Transfer Protocol）即简单邮件传输协议
SMTP 服务器就是遵循 SMTP 协议的发送邮件服务器
POP3是Post Office Protocol 3的简称，即邮局协议的第3个版本
POP3服务器则是遵循POP3协议的接收邮件服务器

SMTP是发送邮件协议

POP3是接收邮件协议

###java如何发送邮件 java中需要使用这个包来发送邮件

帐号准备【注册一个163邮箱，以后公司会有自己的邮件服务器，到时改公司公司的即可】

帐号：15989566325@163.com

密码: gyfitedu

发送邮件代码

package com.gyf.bookstore.utils;
import java.util.Properties;
import javax.mail.Address;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
public class SendJMail {
        public static boolean sendMail(String email, String emailMsg) {
        String from = "15989566325@163.com"; 				// 邮件发送人的邮件地址
        String to = email; 										// 邮件接收人的邮件地址
        final String username = "15989566325@163.com";  	//发件人的邮件帐户
        final String password = "gyfitedu";   					//发件人的邮件密码

        //定义Properties对象,设置环境信息
        Properties props = System.getProperties();

        //设置邮件服务器的地址
        props.setProperty("mail.smtp.host", "smtp.163.com"); // 指定的smtp服务器
        props.setProperty("mail.smtp.auth", "true");
        props.setProperty("mail.transport.protocol", "smtp");//设置发送邮件使用的协议
        //创建Session对象,session对象表示整个邮件的环境信息
        Session session = Session.getInstance(props);
        //设置输出调试信息
        session.setDebug(true);
        try {
            //Message的实例对象表示一封电子邮件
            MimeMessage message = new MimeMessage(session);
            //设置发件人的地址
            message.setFrom(new InternetAddress(from));
            //设置主题
            message.setSubject("用户激活");
            //设置邮件的文本内容
            //message.setText("Welcome to JavaMail World!");
            message.setContent((emailMsg),"text/html;charset=utf-8");
            
            //设置附件
            //message.setDataHandler(dh);
            
            //从session的环境中获取发送邮件的对象
            Transport transport=session.getTransport();
            //连接邮件服务器
            transport.connect("smtp.163.com",25, username, password);
            //设置收件人地址,并发送消息
            transport.sendMessage(message,new Address[]{new InternetAddress(to)});
            transport.close();
            return true;
        } catch (MessagingException e) {
            e.printStackTrace();
            return false;
        }
    }
}

在注册的service中，添加发送邮件功能

激活用户

ActiveServlet:激活的Servlet

UserService:添加激活用户方法

UserDao:添加2个方法

##用户登录 UserDao.java

UserService.java
 
LoginServlet.java

##权限管理

添加一个权限功能，登录成功后，如果是管理员，进行后台，如果是普通用户进入商品首页 LoginServlet.java

我的帐号

修改用户信息

显示用户信息

FindUserByIdServlet
 
UserService
 
UserDao


modifyuserinfo.jsp 
<input type="radio" name="gender" value="男"  ${u.gender == "男" ? "checked='checked'" : ''} />男
<input type="radio" name="gender" value="女" ${u.gender == "女" ? "checked='checked'" : ''}/> 女

###修改用户信息 ModifyUserInfoServlet.java

UserService
 
UserDao

##用户退出

商品

###商品类别

####初始化产品数据 INSERT INTO products (id,name,price,category,pnum,imgurl,description) VALUES (1,'Java入门基础-GYF',168.88,'计算机',3,null,'good book'); INSERT INTO products (id,name,price,category,pnum,imgurl,description) VALUES (2,'HTML入门到精通-GYF',168.88,'计算机',3,null,'good book'); INSERT INTO products (id,name,price,category,pnum,imgurl,description) VALUES (3,'JS入门到精通-GYF',168.88,'计算机',3,null,'good book'); INSERT INTO products (id,name,price,category,pnum,imgurl,description) VALUES (4,'PHP入门到精通-GYF',168.88,'计算机',3,null,'good book'); INSERT INTO products (id,name,price,category,pnum,imgurl,description) VALUES (5,'Android入门到精通-GYF',168.88,'计算机',3,null,'good book'); INSERT INTO products (id,name,price,category,pnum,imgurl,description) VALUES (6,'iOS入门到精通-GYF',168.88,'计算机',3,null,'good book'); INSERT INTO products (id,name,price,category,pnum,imgurl,description) VALUES (7,'MySQL入门到精通-GYF',168.88,'计算机',3,null,'good book'); INSERT INTO products (id,name,price,category,pnum,imgurl,description) VALUES (8,'Oracle入门到精通-GYF',168.88,'计算机',3,null,'good book'); INSERT INTO products (id,name,price,category,pnum,imgurl,description) VALUES (9,'VMWare入门到精通-GYF',168.88,'计算机',3,null,'good book');

INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (11,'武炼巅峰',88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (12,'绝世药神',8.88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (13,'王牌狙击之霸宠狂妻',8.88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (14,'非我倾城：王爷要休妃',8.88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (15,'超品相师',88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (16,'最强弃少',88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (17,'折锦春',88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (18,'金陵春',16,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (19,'总裁的新妻',16,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (21,'武炼巅峰2',88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (22,'绝世药神2',8.88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (23,'王牌狙击之霸宠狂妻2',8.88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (24,'非我倾城：王爷要休妃2',8.88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (25,'超品相师2',88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (26,'最强弃少2',88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (27,'折锦春2',88,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (28,'金陵春2',16,'文学',3,null,'good book');
INSERT INTO products (id,name,price,category,pnum,imgurl,description) 
VALUES (29,'总裁的新妻2',16,'文学',3,null,'good book');

添加产品模型

public class Product {
    private int id;
    private String name;//书名
    private double price;//价格
    private String category;//分类
    private int pnum;//数量
    private String imgurl;//图片
    private String description;//描述
}


ProductDao
public class ProductDao{
    //查询类别的总记录数
    public long count(String category) throws SQLException{
        QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
        String sql = "select count(*) from products where 1=1";
        
	long count = 0;
	if(category != null && !"".equals(category)){
		sql+= " and  category = ?";
		count = (long) qr.query(sql, new ScalarHandler(1), category);
	}else{
		count = (long) qr.query(sql, new ScalarHandler(1));
	}
	
	return count;
}

//分页查找数据
public  List<Product> findBooks(int currentPage,int pageCount,String category) throws SQLException{
	QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
	//定义参数
	List<Object> prmts = new ArrayList<>();
	
	//查询的sql语句
	String sql = "select * from products where 1=1";
	
	//条件
	if(category!=null && !"".equals(category)){
		sql += " and category = ?";
		prmts.add(category);
	}
	
	//分页
	sql += " limit ?,?";
	int start = (currentPage - 1) * pageCount;
	prmts.add(start);
	prmts.add(pageCount);
	
	return qr.query(sql, new BeanListHandler<Product>(Product.class), prmts.toArray());
}

}

ProductService
public class ProductService {
    ProductDao productDao = new ProductDao();
    public PageResult<Product> findPageBooks(int currentPage,int pageCount,String category){
        try {
            //1.创建PageResult
            PageResult<Product> pr = new PageResult<Product>();
		
		//2.获取总记录数
		long totalCount = productDao.count(category);
		
		//3.计算总页数
		int totalPage = (int) Math.ceil(totalCount * 1.0 / pageCount) ;
		
		//4.查询数据库
		List<Product> list = productDao.findBooks(currentPage, pageCount, category);
		
		//5.设置PageResult
		pr.setCurrentPage(currentPage);//当前页
		pr.setPageCount(pageCount);//每页显示记录数
		pr.setTotalCount(totalCount);//总记录数
		pr.setTotalPage(totalPage);//总页数
		pr.setList(list);
		
		return pr;
	} catch (SQLException e) {
		// TODO: handle exception
		e.printStackTrace();
	}
	return null;
}

}

ShowProductByPageServlet
@WebServlet("/showProductByPage")
public class ShowProductByPageServlet extends HttpServlet{

ProductService productService = new ProductService();
@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
	// TODO Auto-generated method stub
	//获取参数
	 String category = request.getParameter("category");//分类
	 String page = request.getParameter("page");//显示页数
	 
	 //2.判断
	 int currentPage = 1;
	 int pageCount = 4;//每页显示5条数据,这个内部定义，不让外面传参数
	 if(page != null){
		 currentPage = Integer.parseInt(page);
	 }
	
	 
	 //3.调用service
	 PageResult<Product> pr = productService.findPageBooks(currentPage, pageCount, category);
	 
	 //4.跳转
	 request.setAttribute("pr", pr);
	 request.setAttribute("category", category);
	 request.getRequestDispatcher("/product_list.jsp").forward(request, response);
}

}

PageResult
	提供get/set方法
public class PageResult<T> {
    private List<T> list;//集合
    private long totalCount;//总记录数
    private int totalPage;//总页数
    private int currentPage;//当前页
    private int pageCount = 5;//每页显示的条数

Product_list.html

部分截图

添加图书图片显示

添加图书信息查看

ProductDao

ProductService

ProductInfoservlet

Productinfo.jsp

3.4 添加购物车

AddCartServet.java
@WebServlet("/addCart")
public class AddCartServlet extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.根据id查找图书
        String id = request.getParameter("id");
        ProductService ps = new ProductService();
        Product book = ps.findBookById(id);
	
	//2.从session中获取购物车信息
	@SuppressWarnings("unchecked")
	Map<Product,Integer> cart = (Map<Product, Integer>) request.getSession().getAttribute("cart");
	
	//3.如果是空，创建一个购物边集合
	if(cart == null){
		cart = new HashMap<Product,Integer>();
	}
	
	//4.判断购物车中是否有当前书的记录
	if(cart.containsKey(book)){
		cart.put(book, cart.get(book) + 1);
	}else{
		cart.put(book, 1);
	}
	System.out.println("购物车信息:" + cart);
	
	//5.重新保存到session中
	request.getSession().setAttribute("cart", cart);
	
	//6.继续购物或者结算查看购物车
	String html = "<a href='"+ request.getContextPath() +"/showProductByPage'>继续购物</a>";
	html += "&nbsp;&nbsp;&nbsp;&nbsp;<a href='" + request.getContextPath()  + "/cart.jsp'>查看购物车</a>";
	response.getWriter().write(html);
}

}

显示购物车

从Session中获取数据

cart.jsp

		<td width="10%">${entry.key.price}</td>
		<td width="20%">
		<input type="button" value='-'
			style="width:20px">

			<input name="text" type="text"  value="${entry.value}"
			style="width:40px;text-align:center" /> <input
			type="button" value='+' style="width:20px">

		</td>
		<td width="10%">${entry.key.pnum}</td>
		<td width="10%">${entry.key.price * entry.value}</td>

		<td width="10%"><a href="#"
			style="color:#FF0000; font-weight:bold">X</a></td>
	</tr>
	
	<!-- 累加价格 -->
	<c:set var="totalPrice" value="${totalPrice + entry.key.price * entry.value}"></c:set>
</c:forEach>

${vs.count}

${entry.key.name}

3.6 更改购物车信息JS Cart.jsp

Js
<script type="text/javascript">
    /* 	id : 产品id,书的id
     num:更改的数量
     totalNumber:产品总数量 */

    function changeNum(id, num, totalNumber) {
        console.log('图书ID:' + id + ' 购买数量:' + num + '总量:' + totalNumber);
        
        //当购买的数据大于总商品数量时
        if(num > totalNumber){
            alert('不能购买大于库存的数据');
            return;
        }
        
        //当商品数量等于0时，给个提醒
        if(num < 1){
            if(!confirm('是否要删除此商品')){//删除此商品
                return;
            }
        }
        
        console.log('执行操作....');
        //重新访问后台，更改session的数据
        location.href = '${pageContext.request.contextPath}/changeNum?id=' + id + '&num=' + num;
        
    }
</script>
ChangeNumServlet.java
@WebServlet("/changeNum")
public class ChangeNumServlet extends HttpServlet{
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        //1.获取请求参数
        String id = request.getParameter("id");
        String num = request.getParameter("num");
        
        if(id == null && num == null){
            response.getWriter().write("非法访问");return;
        }
        
        //2.只需要封装个对象，设置个ID即可
	ProductService ps = new ProductService();
	Product book = ps.findBookById(id);
	if(book == null){
		response.getWriter().write("非法访问");return;
	}
	
	@SuppressWarnings("unchecked")
	Map<Product,Integer> cart = (Map<Product, Integer>) request.getSession().getAttribute("cart"); 
	if(cart == null){
		response.getWriter().write("非法访问");return;
	}
	
	if(num.equals("0")){
		cart.remove(book);//把这个产品从session中移除
	}else{
		if(cart.containsKey(book)){//更改数量
			cart.put(book, Integer.parseInt(num));
		}
	}
	
	request.setAttribute("cart", cart);
	request.getRequestDispatcher("cart.jsp").forward(request, response);
}

}

结算功能

结帐Servlet

Order.jsp

##下单注意点：

把之前写的ManagerThreadLocal拿过来用

下单成功后，把session的购物车清空

Order.jsp

Order.jsp的表单通过js提交

CreateOrderServlet

Order order = new Order();
	//获取当前登录用户的信息
	User user = (User) request.getSession().getAttribute("user");
	
	try {
		//1.把请求通过封闭到Order中
		BeanUtils.populate(order, request.getParameterMap());
		
		//2.设置用户
		order.setUser(user);
		
		//3.设置ID
		order.setId(UUID.randomUUID().toString());
		
		//4.设置定单详情
		@SuppressWarnings("unchecked")
		Map<Product,Integer> cart = (Map<Product, Integer>) request.getSession().getAttribute("cart");
		
		List<OrderItem> orderItems = new ArrayList<OrderItem>();
		for(Entry<Product,Integer> entry : cart.entrySet()){
			OrderItem oi = new OrderItem();
			oi.setBuynum(entry.getValue());
			oi.setP(entry.getKey());
			oi.setOrder(order);
			orderItems.add(oi);
		}
		order.setOrderItems(orderItems);
		
		//5.设置定单时间
		order.setOrdertime(new Date());
		
		//6.订单保存
		OrderService os = new OrderService();
		os.addOrder(order);
		//7.进入支付页面
		request.getRequestDispatcher("/pay.jsp").forward(request, response);
	} catch (Exception e) {
		e.printStackTrace();
	}

OrderService public class OrderService {

OrderDao orderDao = new OrderDao();
OrderItemDao orderItemDao = new OrderItemDao();
ProductDao productDao = new ProductDao();
/**
 * 保存定单
 * @param order
 */
public void addOrder(Order order){
	//1.开启事务
	ManagerThreadLocal.beginTransaction();
	try {
		//2.保存定单表
		orderDao.saveOrder(order);
		//3.保存订单详情表
		for(OrderItem oi : order.getOrderItems()){
			orderItemDao.saveOrderItem(oi);
			//更改产品可卖数量
			productDao.updateProductNum(oi.getP().getId(),oi.getBuynum());
		}
		//4.结束事务
		ManagerThreadLocal.commitTransaction();
	} catch (Exception e) {
		e.printStackTrace();
		//5.回滚
		ManagerThreadLocal.rollback();
	}
}

} OrderDao

OrderItemDao

ProductDao

定单详情的另一种批处理

public void saveOrderItems(List<OrderItem> items) throws SQLException{
	//1.封装参数
	Object[][] params = new Object[items.size()][];
	for(int i=0;i<items.size();i++){
		OrderItem oi = items.get(i);
		params[i] = new Object[]{oi.getOrder().getId(),oi.getP().getId(),oi.getBuynum()};
	}
	
	//2.批处理
	String sql = "insert into orderitem values (?,?,?)";
	QueryRunner qr = new QueryRunner();
	qr.batch(ManagerThreadLocal.getConnection(), sql,params );
}

3.9查看定单信息 OrderDao

OrderService

FindOrderByIdServlet

Orderlist.jsp

3.10 查看定单详情 OrderDao

public Order findOrderByOrderId(String orderId)throws SQLException {
	// TODO Auto-generated method stub
	QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
	
	//1.查询定单表
	String sql = "select * from orders where id = ?";
	Order order = qr.query(sql, new BeanHandler<Order>(Order.class),orderId);
	
	//2.查询定单下面的详情
	sql = "SELECT o.*,p.name,p.price FROM orderitem o, products p WHERE o.product_id = p.id AND o.order_id = ?";
	List<OrderItem> orderItems = qr.query(sql, new ResultSetHandler<List<OrderItem>>(){
		
		@Override
		public List<OrderItem> handle(ResultSet rs) throws SQLException {
			// TODO Auto-generated method stub
			List<OrderItem> items = new ArrayList<OrderItem>();
			while(rs.next()){
				//封装定单详情
				OrderItem item = new OrderItem();
				item.setBuynum(rs.getInt("buynum"));
				
				//封装产品【只获取商品名称和价格】
				Product p = new Product();
				p.setName(rs.getString("name"));
				p.setPrice((rs.getDouble("price")));
				
				//把产品放入详情
				item.setP(p);
				
				//把详情添加到集合
				items.add(item);
			}
			return items;
		}
		
	},orderId);
	
	order.setOrderItems(orderItems);
	
	return order;
}

OrderService

public Order findOrderByOrderId(String orderId){
	try {
		return orderDao.findOrderByOrderId(orderId);
	} catch (SQLException e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
	}
	return null;
}

FindOrderItemsByOrderIdServlet
@WebServlet("/findOrderItemsByOrderId")
public class FindOrderItemsByOrderIdServlet extends HttpServlet{

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response) 
		throws ServletException, IOException {
	//获取请求参数
	String orderid = request.getParameter("orderid");
	
	//查询定单
	OrderService os = new OrderService();
	Order order = os.findOrderByOrderId(orderid);
	
	//存数据到request
	request.setAttribute("order", order);
	request.getRequestDispatcher("/orderInfo.jsp").forward(request, response);
	//System.out.println(orderid);
}

}

orderInfo.jsp

用户模块优化优化一

将相同的模块的功能抽取到一个Servlet中【画图讲解】

@WebServlet("/user/*")
public class UserServlet extends HttpServlet {

private static final long serialVersionUID = 1L;

@Override
protected void doPost(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	// TODO Auto-generated method stub
	// 1.获取action参数
	String action = request.getParameter("action");
	System.out.println("action:" + action);
	if (action.equals("login")) {
		login(request, response);
	} else if (action.equals("register")) {
		register(request, response);
	} else if(action.equals("logout")){
		logout(request, response);
	}else{
		response.getWriter().write("不合法访问");
	}
}

@Override
protected void doGet(HttpServletRequest request, HttpServletResponse response)
		throws ServletException, IOException {
	// TODO Auto-generated method stub
	doPost(request, response);
}

} 访问时就以下面的方式访问

    http://locahost:8080/bookstore/user?action=login
    
    http://locahost:8080/bookstore/user?action=register
    
    http://locahost:8080/bookstore/user?action=logout

优化二抽取BaseServlet

public class BaseServlet extends HttpServlet{

@Override
protected void service(HttpServletRequest request, HttpServletResponse response) 
		throws ServletException, IOException {
	
	//1.方法名
	String action = request.getParameter("action");
	
	try {
		//2.通过反制获取方法名
		Method method = this.getClass().getDeclaredMethod(action, HttpServletRequest.class,HttpServletResponse.class);
		
		//3.调用方法
		method.invoke(this,request,response);
	} catch (NoSuchMethodException  e) {
		e.printStackTrace();
	}catch (SecurityException e) {
		e.printStackTrace();
	}catch (IllegalAccessException e) {
		e.printStackTrace();
	} catch (IllegalArgumentException e) {
		e.printStackTrace();
	} catch (InvocationTargetException e) {
		e.printStackTrace();
	}
}

}

UserServlet只需要继承baseservlet

这样做，不需要像第一种那样过多的方法名判断

管理员与普通用户的权限

//只拦截admin路径下的请求

@WebFilter("/admin/*")
public class RoleFilter implements Filter{
@Override
public void init(FilterConfig filterConfig) throws ServletException {}

@Override
public void doFilter(ServletRequest req, ServletResponse resp, FilterChain chain)
		throws IOException, ServletException {
	// TODO Auto-generated method stub
	HttpServletRequest request = (HttpServletRequest) req;
	HttpServletResponse response = (HttpServletResponse) resp;
	User user = (User) request.getSession().getAttribute("user");
	
	if(user != null){
		if(!"管理员".equals(user.getRole())){
			response.getWriter().write("权限不足，没有管理员权限,使用管理员帐号登录");
			response.setHeader("Refresh", "3;url="+ request.getContextPath()+"/index.jsp");
			return;
		}else{
			//放行
			chain.doFilter(request, response);
			return;
		}
	
	}
	
	//进入登录界面
	response.sendRedirect(request.getContextPath()+"/login.jsp");
}

@Override
public void destroy() {}

}

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