Java-网上购物中用Session实现的购物车

首先创建一个购物车

package www.csdn.cart;

import java.util.ArrayList;
import java.util.List;

/**
 * BuyCart 2013-5-23 下午3:30:20 购物车
 * 
 * @author 乔晓松
 * 
 */
public class BuyCart {

	// 购物项
	private List<BuyItem> items = new ArrayList<BuyItem>();

	/**
	 * 添加购物项
	 * 
	 * @param item
	 */
	public void addBuyItem(BuyItem item) {
		if (items.contains(item)) {
			// 累加购买数量
			for (BuyItem bitem : items) {
				if (bitem.equals(item)) {
					bitem.setAmount(bitem.getAmount() + 1);
					break;
				}
			}
		} else {
			items.add(item);
		}
	}

	public List<BuyItem> getItems() {
		return items;
	}

	public void setItems(List<BuyItem> items) {
		this.items = items;
	}

}

 

接着，创建购物项

package www.csdn.cart;

import www.csdn.domain.ProductInfo;

/**
 * BuyItem 2013-5-23 下午3:30:36 购物项
 * 
 * @author 乔晓松
 * 
 */
public class BuyItem {
	// 商品
	private ProductInfo product;
	// 商品数量
	private int amount;

	public ProductInfo getProduct() {
		return product;
	}

	public void setProduct(ProductInfo product) {
		this.product = product;
	}

	public int getAmount() {
		return amount;
	}

	public void setAmount(int amount) {
		this.amount = amount;
	}

	@Override
	public int hashCode() {
		/**
		 * 对hashCode重写，并改造一下hashCode，把商品的Id和商品类型的Id组成并取hashCode哈希码
		 */
		String result = product.getId() + "-"
				+ product.getStyles().iterator().next().getSid();
		return result.hashCode();
	}

	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		BuyItem other = (BuyItem) obj;
		if (product == null) {
			if (other.product != null)
				return false;
		} else if (!product.equals(other.product))
			return false;
		if (product.getStyles().size() != other.getProduct().getStyles().size())
			return false;
		Integer styleid = product.getStyles().iterator().next().getSid();
		Integer otherstyleid = other.getProduct().getStyles().iterator().next()
				.getSid();
		if (!styleid.equals(otherstyleid))
			return false;
		return true;
	}

}

商品类：

package www.csdn.domain;

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;

/**
 * ProductInfo 2013-5-23 下午3:49:46
 * 
 * @author 乔晓松
 * 
 */
public class ProductInfo implements Serializable {

	/**
	 * 商品信息
	 */
	private static final long serialVersionUID = 1L;
	private Integer id;
	private String name;
	private Double price;
	private String decript;
	private Set<Style> styles = new HashSet<Style>();

	public ProductInfo() {
		super();
	}

	public ProductInfo(Integer id) {
		super();
		this.id = id;
	}

	public ProductInfo(Integer id, String name, Double price, String decript,
			Set<Style> styles) {
		super();
		this.id = id;
		this.name = name;
		this.price = price;
		this.decript = decript;
		this.styles = styles;
	}

	public Integer getId() {
		return id;
	}

	public void setId(Integer id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Double getPrice() {
		return price;
	}

	public void setPrice(Double price) {
		this.price = price;
	}

	public String getDecript() {
		return decript;
	}

	public void setDecript(String decript) {
		this.decript = decript;
	}

	public Set<Style> getStyles() {
		return styles;
	}

	public void setStyles(Set<Style> styles) {
		this.styles = styles;
	}

	public void addProductStyle(Style style) {
		this.styles.add(new Style());
	}

}

商品颜色类型：

package www.csdn.domain;

import java.io.Serializable;

/**
 * Style 2013-5-23 下午3:47:04
 * 
 * @author 乔晓松
 */
public class Style implements Serializable {

	/**
	 * 样式信息
	 */
	private static final long serialVersionUID = 1L;
	// 样式ID
	private Integer sid;
	// 样式名称
	private String sname;

	public Style() {
		super();
	}

	public Style(Integer sid) {
		super();
		this.sid = sid;
	}

	public Style(Integer sid, String sname) {
		super();
		this.sid = sid;
		this.sname = sname;
	}

	public Integer getSid() {
		return sid;
	}

	public void setSid(Integer sid) {
		this.sid = sid;
	}

	public String getSname() {
		return sname;
	}

	public void setSname(String sname) {
		this.sname = sname;
	}

}

 

 

测试类：

package junit.test;

import org.junit.Test;

import www.csdn.cart.BuyCart;
import www.csdn.cart.BuyItem;
import www.csdn.domain.ProductInfo;
import www.csdn.domain.Style;

/**
 * BuyCartTest 2013-5-23 下午4:38:12
 * 
 * @author 乔晓松
 * 
 */
public class BuyCartTest {

	/**
	 * 测试购物车是否能添加商品
	 */
	@Test
	public void save1() {
		// 创建购物车
		BuyCart cart = new BuyCart();
		// 创建购物项
		BuyItem item = new BuyItem();
		ProductInfo product = new ProductInfo(20);
		product.addProductStyle(new Style(90));
		item.setProduct(product);
		cart.addBuyItem(item);

		// 输出购物车中的商品的Id和类型的Id
		for (BuyItem bitem : cart.getItems()) {
			System.out
					.println(bitem.getProduct().getId()
							+ "------------"
							+ bitem.getProduct().getStyles().iterator().next()
									.getSid());
		}
	}

	/**
	 * 测试添加相同的商品和类型，购物车中商品的数量是否累加
	 */
	@Test
	public void save2() {
		BuyCart cart = new BuyCart();
		BuyItem item = new BuyItem();
		ProductInfo product = new ProductInfo(30);
		product.addProductStyle(new Style(80));
		item.setProduct(product);
		cart.addBuyItem(item);

		BuyItem item2 = new BuyItem();
		ProductInfo product2 = new ProductInfo(30);
		product2.addProductStyle(new Style(80));
		item2.setProduct(product2);
		cart.addBuyItem(item2);

		// 输出购物车中的商品的Id和类型的Id
		for (BuyItem bitem : cart.getItems()) {
			System.out
					.println(bitem.getProduct().getId()
							+ "------------"
							+ bitem.getProduct().getStyles().iterator().next()
									.getSid());
		}
	}
}