📄 addgood.java

📁 很好的东东本人随便做的仅供学习之用
💻 JAVA
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package xiaoshou.servlets;

import java.io.IOException;
import java.util.ArrayList;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import xiaoshou.classes.CGood;
import xiaoshou.javabeans.Operator;

public class AddGood extends HttpServlet {
	//往购物车里加药品
	/**
	 * Constructor of the object.
	 */
	public AddGood() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * 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 {

/*		PrintWriter out = response.getWriter();
		out
				.println("<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\">");
		out.println("<HTML>");
		out.println("  <HEAD><TITLE>A Servlet</TITLE></HEAD>");
		out.println("  <BODY>");
		out.print("    This is ");
		out.print(this.getClass());
		out.println(", using the GET method");
		out.println("  </BODY>");
		out.println("</HTML>");
		out.flush();
		out.close();
*/
		doPost(request,response);
	}

	/**
	 * 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 {
		request.setCharacterEncoding("gb2312");
		
		String[] sid=request.getParameterValues("checkbox");
		//checkbox的value是药品的id,也是对应textbox的name
		int n=sid.length;//选择的药品种类的个数(明细条数)
		
		ArrayList list=new ArrayList();
		for(int i=0;i<n;i++){
			String snum=request.getParameter(sid[i]);//对应textbox的value,即药品数量						
			int num=Integer.parseInt(snum);//转化为数字
			
			CGood good=Operator.queryGood(sid[i]);
			good.setNum(num);//设置定购药品数量
			list.add(good);
		}
		
/*以下代码把选的药品加入购物车中,若两次的药品相同，则合并其数量*/
		if(list.size()>0){
			ArrayList lists=(ArrayList)request.getSession(true).getAttribute("lists");
			if(lists!=null){//
				ArrayList same=new ArrayList();//用于暂存相同的药品
				for(int i=0;i<lists.size();i++){
					for(int j=0;j<list.size();j++){
						CGood good1=null,good2=null;
						good1=(CGood)lists.get(i);
						good2=(CGood)list.get(j);
						if(good1.getId()==good2.getId()){
							good1.setNum(good1.getNum()+good2.getNum());
							same.add(good2);//把相同的药品放入same列表
						}						
					}
				}
				if(same.size()>0)
					list.removeAll(same);//清掉相同的药品
				if(list.size()>0)
					lists.addAll(list);//添加药品到购物车
				request.getSession(true).removeAttribute("lists");
			}else{
				lists=list;
			}
			request.getSession(true).setAttribute("lists", lists);
		}
/* ******************************************/
		
		request.getRequestDispatcher("/xiaoshou/applyGoods.jsp").forward(request, response);
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occure
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}
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