javaweb中servlet处理cookies+json

import java.io.*;
import java.util.*;
import javax.servlet.*;
import javax.servlet.http.*;
import net.sf.json.JSONObject;
import com.masque.beans.BookBean;
import com.masque.daoimpl.BookDaoImpl;
import com.sun.xml.internal.bind.v2.runtime.Name;
import com.sun.xml.internal.bind.v2.runtime.output.Encoded;

/**
 * 此类描述的是对存储书籍的cookies的处理，再返回数据到jsp
 */
public class BuyOneBook extends HttpServlet {
    /**
     * The doGet method of the servlet. <br>
     *
     * This method is called when a form has its tag value method equals to get.
     *

     * @param request
     *            the request send by the client to the server
     * @param response
     *            the response send by the server to the client
     * @throws ServletException
     *             if an error occurred
     * @throws IOException
     *             if an error occurred
     */
    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html,charset=UTF-8");
        // 得到jsp传过来的书本的id
        int bookId = Integer.parseInt((String) request.getParameter("count"));
        // 得到cookies数组
        request.setCharacterEncoding("UTF-8");
        Cookie[] cookie = request.getCookies();
        // 定义变量用来接受书本保存的json的字符串表现形式
        String bookList = null;
        //定义一个标志位判断书籍的json你时候有该书籍

        boolean isIn = false;
        boolean isNew = true;
        if (cookie != null) {
            // 遍历cookie数组
            for (int i = 0; i < cookie.length; i++) {
                if (cookie[i].getName().equals("jsonBookList")) {
                    bookList = cookie[i].getValue();
                    bookList = java.net.URLDecoder.decode(bookList,"UTF-8");
                    //bookList = new String(bookList.getBytes("ISO-8859-1"), "gbk");
                }
            }
            System.out.println("bookList:"+bookList);
            if (bookList != null) {
                // 将字符串转换为json对象
                JSONObject jsonBookList = JSONObject.fromObject(bookList);
                // 获取json对象的迭代器
                Iterator iterator = jsonBookList.keySet().iterator();
                // 遍历迭代器，查询json中是否存在当前用户购买的书籍
                while (iterator.hasNext()) {
                    // 得到用户购买书籍的id

                    String key = iterator.next().toString();
                        // 判断是否已购买
                    if (key.equals(bookId+"")) {
                        isIn = true;
                        break;
                    }
                }
                if (!isIn) {
                    //如果书籍没有被购买，初始化书籍的数量,再添加书籍到json
                    int bookSize = 1;
                    //添加书籍到json
                    addBook(bookId, jsonBookList,response,bookSize);
                }else {//json存在该书籍，则给給书籍的数量加1
                    //已经被购买的书籍的json
                    JSONObject jsonBook = JSONObject.fromObject(jsonBookList.get(bookId+"").toString());
                    int bookSize = Integer.parseInt(jsonBook.get("bookSize").toString())+1;
                    //添加书籍到json
                    addBook(bookId, jsonBookList,response,bookSize);
                }
            }else {

                isNew = false;
            }
        }else {
            isNew = false;
        }
        if (!isNew) {
            //生成一个JSONObject对象
            String data = "{}";
            JSONObject jsonBookList = JSONObject.fromObject(data);
            //添加书籍到json
            int bookSize = 1;
            addBook(bookId, jsonBookList,response,bookSize);
        }
        //跳转到处理cookies的servlet
        response.sendRedirect("readallbook.do?load=1");
    }

    /**
     * The doPost method of the servlet. <br>
     *

     * This method is called when a form has its tag value method equals to
     * post.
     *
     * @param request
     *            the request send by the client to the server
     * @param response
     *            the response send by the server to the client
     * @throws ServletException
     *             if an error occurred
     * @throws IOException
     *             if an error occurred
     */
    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        doGet(request, response);
    }

    private void addBook(int bookId, JSONObject jsonBookList,HttpServletResponse response,int bookSize) {
        // 定义集合保存一本书的信息
        Map<String, String> map = new HashMap<String, String>();

        // 根据书籍的id得到书籍实体对象
        BookBean bookBean = (new BookDaoImpl()).SelectOneBook(bookId);
        // 添加表格需要显示的书籍的信息添加到集合
        map.put("bookId", bookId + "");
        map.put("title", bookBean.getTitle());
        map.put("price", bookBean.getPrice() + "");
        map.put("bookSize", bookSize+"");
        map.put("priceAll", bookBean.getPriceAll()+"");
        //将该书籍的信息的集合添加到json对象中
        jsonBookList.put(bookId, map);
        //将json的字符串形式添加到cookies中
        String str=null;
        try {
            str = java.net.URLEncoder.encode(jsonBookList.toString().replace("\"", "\'"),"UTF-8");
        } catch (UnsupportedEncodingException e1) {
            e1.printStackTrace();
        }
        Cookie  cookie = new Cookie("jsonBookList",str);
        //cookie.setMaxAge(300);
        response.addCookie(cookie);

    }

}