?? update.java
字號:
package com.yxq.servlet;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.yxq.bean.SingleObject;
public class Update extends HttpServlet {
private Map havemap=new HashMap();
protected void doGet(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
doPost(request,response);
}
protected void doPost(HttpServletRequest request,HttpServletResponse response) throws ServletException, IOException {
HttpSession session=request.getSession();
String sessionID=session.getId();
Map carmap=(HashMap)session.getAttribute("carmap");
String updateN[]=request.getParameterValues("car_number");
String updateID[]=request.getParameterValues("car_id");
if((updateN==null||updateN.length==0)||(updateID==null||updateID.length==0)||(carmap==null||carmap.size()==0)){}
else{
for(int i=0;i<carmap.size();i++){
int num=0;
try{
num=Integer.parseInt(updateN[i]);
}catch(Exception e){
num=1;
}
if(num<0)
num=1;
SingleObject carsingle=(SingleObject)carmap.get(Integer.valueOf(updateID[i]));
carsingle.setMessage("");
if(num==carsingle.getBuyN()){
continue;
}
else{
int exist=0;
havemap=(HashMap)session.getServletContext().getAttribute("havemap");
if(havemap!=null&&havemap.size()!=0&&havemap.containsKey(Integer.valueOf(updateID[i]))){
synchronized(havemap){
exist=(Integer)havemap.get(Integer.valueOf(updateID[i]))-(num-carsingle.getBuyN());
if(exist<0){
carsingle.setMessage("庫存不足!");
carsingle.setHave((Integer)havemap.get(carsingle.getId()));
}
else{
havemap.put(carsingle.getId(),exist);
session.getServletContext().setAttribute("havemap",havemap);
carsingle.setHave(exist);
carsingle.setBuyN(num);
carsingle.setBuyMoney(carsingle.getBuyN()*carsingle.getPrice());
carmap.put(Integer.valueOf(updateID[i]),carsingle);
}
}//synchronized(havemap)
}
}
}
session.setAttribute("carmap",carmap);
Map usermap=(HashMap)session.getServletContext().getAttribute("usermap");
usermap.put(sessionID,carmap);
session.getServletContext().setAttribute("usermap",usermap);
}
RequestDispatcher rd=request.getRequestDispatcher("/templet.jsp");
rd.forward(request,response);
}
}
?? 快捷鍵說明
復制代碼
Ctrl + C
搜索代碼
Ctrl + F
全屏模式
F11
切換主題
Ctrl + Shift + D
顯示快捷鍵
?
增大字號
Ctrl + =
減小字號
Ctrl + -