public class ShowAllBooksServlet extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
out.write("本网站有以下好书：<br/>");
Map<String, Book> books = DBUtil.findAllBooks();
for (Map.Entry<String, Book> book : books.entrySet()) {
out.write("<a href=‘"+request.getContextPath()+"/servlet/showBookDetail?id="+book.getKey()+"‘ target=‘_blank‘>"+book.getValue().getName()+"</a><br/>");
}
out.write("<hr/>您最近浏览过的书有：<br/>");
Cookie[] cookies = request.getCookies();
for (int i = 0;cookies!=null && i < cookies.length; i++) {
if("historyBookId".equals(cookies[i].getName())){//判断是否有historyBookId的cookie
String value = cookies[i].getValue(); // 1-2-3
String[] ids = value.split("-");
for (int j = 0; j < ids.length; j++) {
Book book = DBUtil.findBookById(ids[j]);//根据ID得到指定的书
out.print(book.getName()+"<br/>");
}
}
}
}
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
doGet(request, response);
}
}