java_Cookies_1_商品浏览历史记录servlet1

public class CookiesServlet1 extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setCharacterEncoding("UTF-8");
		response.setContentType("text/html;charset=UTF-8");
		PrintWriter out = response.getWriter();

		// 输入网站所有商品
		out.write("本网站有如下商品:<br/>");
		Map<String, Book> map = Db.getAll();
		for (Map.Entry<String, Book> entry : map.entrySet()) {
			Book book = entry.getValue();
			out.write("<a href='/NANA/servlet/CookiesServlet2?id="
					+ book.getId() + "' target='_blank'>" + book.getName()
					+ "</a><br/>");

		}

		// 显示曾经看过的商品
		out.write("<br/>你曾经看过:<br/>");
		Cookie cookies[] = request.getCookies();
		for (int i = 0; cookies != null && i < cookies.length; i++) {
			if (cookies[i].getName().equals("bookHistory")) {
				String ids[] = cookies[i].getValue().split("\\,");
				for (String id : ids) {
					Book book = (Book) Db.getAll().get(id);
					out.print(book.getName()+"<br/>");
				}
			}

		}

	}

	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		doGet(request, response);
	}

}

class Db {
	private static Map<String, Book> map = new LinkedHashMap<String, Book>();

	static {
		map.put("1", new Book("1", "javaweb", "老张", "一本好书"));
		map.put("2", new Book("2", "jdbc", "aaa", "2ben好书"));
		map.put("3", new Book("3", "spring", "bbb", "3本好书"));
		map.put("4", new Book("4", "struts", "cccc", "4本好书"));
		map.put("5", new Book("5", "hibernet", "ddd", "5本好书"));
	}

	public static Map<String, Book> getAll() {
		return map;
	}
}

class Book {
	private String id;
	private String name;
	private String author;
	private String description;

	public Book() {
		super();
		// TODO Auto-generated constructor stub
	}

	public Book(String id, String name, String author, String description) {
		super();
		this.id = id;
		this.name = name;
		this.author = author;
		this.description = description;
	}

	public String getId() {
		return id;
	}

	public void setId(String 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 String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

}