标签:des style blog http java color
1 package cn.itcast.shopping; 2 3 import java.io.IOException; 4 import java.io.PrintWriter; 5 import java.util.Map; 6 7 import javax.servlet.ServletException; 8 import javax.servlet.http.HttpServlet; 9 import javax.servlet.http.HttpServletRequest; 10 import javax.servlet.http.HttpServletResponse; 11 12 import cn.itcast.Book; 13 import cn.itcast.Db; 14 15 public class ListBookServlet extends HttpServlet { 16 17 public void doGet(HttpServletRequest request, HttpServletResponse response) 18 throws ServletException, IOException { 19 20 response.setCharacterEncoding("UTF-8"); 21 response.setContentType("text/html;charset=UTF-8"); 22 PrintWriter out = response.getWriter(); 23 24 out.write("本网站有如下商品:<br/>"); 25 Map<String,Book> map = Db.getAll(); 26 for (Map.Entry<String, Book> entry : map.entrySet()) { 27 Book book = entry.getValue(); 28 out.print(book.getName()+"<a href=‘/ServletDemo/servlet/BuyServlet?id="+book.getId()+"‘ target=‘_blank‘>购买</a><br/>"); 29 } 30 31 } 32 33 public void doPost(HttpServletRequest request, HttpServletResponse response) 34 throws ServletException, IOException { 35 36 37 } 38 39 }
1 package cn.itcast.shopping; 2 3 import java.io.IOException; 4 import java.io.PrintWriter; 5 import java.util.ArrayList; 6 import java.util.List; 7 8 import javax.servlet.ServletException; 9 import javax.servlet.http.HttpServlet; 10 import javax.servlet.http.HttpServletRequest; 11 import javax.servlet.http.HttpServletResponse; 12 import javax.servlet.http.HttpSession; 13 14 import cn.itcast.Book; 15 import cn.itcast.Db; 16 17 //完成购买 18 public class BuyServlet extends HttpServlet { 19 20 21 public void doGet(HttpServletRequest request, HttpServletResponse response) 22 throws ServletException, IOException { 23 24 String id = request.getParameter("id"); 25 Book book = (Book) Db.getAll().get(id); 26 27 HttpSession session =request.getSession(); 28 29 //从Session得到用户名用于保存所有书的集合(购物车) 30 List list = (List) session.getAttribute("list"); 31 if(list==null){ 32 list = new ArrayList(); 33 session.setAttribute("list", list); 34 } 35 list.add(book); 36 37 // request.getRequestDispatcher("/servlet/ListCarServlet").forward(request, response); 38 response.sendRedirect(request.getContextPath()+"/servlet/ListCarServlet"); 39 } 40 41 public void doPost(HttpServletRequest request, HttpServletResponse response) 42 throws ServletException, IOException { 43 44 } 45 46 }
1 package cn.itcast.shopping; 2 3 import java.io.IOException; 4 import java.io.PrintWriter; 5 import java.util.List; 6 7 import javax.servlet.ServletException; 8 import javax.servlet.http.HttpServlet; 9 import javax.servlet.http.HttpServletRequest; 10 import javax.servlet.http.HttpServletResponse; 11 import javax.servlet.http.HttpSession; 12 13 import cn.itcast.Book; 14 15 //显示用户购买商品 16 public class ListCarServlet extends HttpServlet { 17 18 public void doGet(HttpServletRequest request, HttpServletResponse response) 19 throws ServletException, IOException { 20 21 response.setCharacterEncoding("UTF-8"); 22 response.setContentType("text/html;charset=UTF-8"); 23 PrintWriter out = response.getWriter(); 24 25 HttpSession session = request.getSession(false); 26 if(session==null){ 27 out.write("您没有购买任何商品!!"); 28 return; 29 } 30 31 out.write("您购买了如下商品:<br/>"); 32 List<Book> list = (List) session.getAttribute("list"); 33 for(Book book : list){ 34 out.write(book.getName()); 35 } 36 } 37 38 39 public void doPost(HttpServletRequest request, HttpServletResponse response) 40 throws ServletException, IOException { 41 42 43 } 44 45 }
1 package cn.itcast; 2 3 import java.util.LinkedHashMap; 4 import java.util.Map; 5 6 public class Db { 7 private static Map<String, Book> map = new LinkedHashMap(); 8 9 static{ 10 map.put("1", new Book("1","javaweb开发","Zero","一本好书!!")); 11 map.put("2", new Book("2","jdbc开发","one","一本好书!!")); 12 map.put("3", new Book("3","spring开发","two","一本好书!!")); 13 map.put("4", new Book("4","struks开发","three","一本好书!!")); 14 map.put("5", new Book("5","hibernate开发","four","一本好书!!")); 15 } 16 17 public static Map getAll(){ 18 return map; 19 } 20 }
1 package cn.itcast; 2 3 import java.io.Serializable; 4 5 6 public class Book implements Serializable { 7 private String id; 8 private String name; 9 private String author; 10 private String description; 11 12 public Book(String id, String name, String author, String description) { 13 super(); 14 this.id = id; 15 this.name = name; 16 this.author = author; 17 this.description = description; 18 } 19 20 public String getId() { 21 return id; 22 } 23 24 public void setId(String id) { 25 this.id = id; 26 } 27 28 public String getName() { 29 return name; 30 } 31 32 public void setName(String name) { 33 this.name = name; 34 } 35 36 public String getAuthor() { 37 return author; 38 } 39 40 public void setAuthor(String author) { 41 this.author = author; 42 } 43 44 public String getDescription() { 45 return description; 46 } 47 48 public void setDescription(String description) { 49 this.description = description; 50 } 51 }
用session实现简单的购物,布布扣,bubuko.com
标签:des style blog http java color
原文地址:http://www.cnblogs.com/aineko/p/3834771.html