Java编写网上超市购物结算功能程序

使用java语言编写一个模拟网上超市购物结算功能的程序，要求程序运行后有一个图形用户界面，可供用户输入购买的各种商品相关信息，最后给出用户的购物清单及总价格。
需求分析：
1.管理员添加商品以及其价格
2.用户购买商品打印订单信息以及结算订单
代码：

/* 
 * 创建者：张俊强 
 * 时间：2016/5/15 
 * */ 
package salesys; 
 
import java.awt.*; 
import java.awt.event.*; 
import java.util.vector; 
 
import javax.swing.*; 
 
import java.sql.*; 
 
class goods{ 
 public string[] name; 
 public float[] price; 
 goods(){ 
  name =new string[100]; 
  price=new float[100]; 
 } 
} 
public class supermarket extends jframe{ 
 public static void main(string[] args) throws sqlexception{ 
  mainwinow mainwin=new mainwinow("网上超市购物结算");   
  mainwin.setdefaultcloseoperation(jframe.exit_on_close); 
  mainwin.setbounds(300, 300, 500, 400); 
  mainwin.setvisible(true); 
  mainwin.setwin(mainwin); 
  mainwin.setminwindowlayout(); 
 } 
} 
 
class mainwinow extends jframe{ 
 goods goods; 
 private jbutton user; 
 private jbutton manager; 
 private jlabel loginlabel; 
 private managewindow magwin; 
 private userwindow userwin; 
 private listener lis; 
 private mainwinow loginwin; 
 private int goodsnum; 
 /* 
 * 设置界面 
 * */ 
 private jlabel setnamelabel; 
 private jlabel setpricelabel; 
 private jtextfield setnametext; 
 private jtextfield setpricetext; 
 private jbutton inputbut; 
 private textarea inputarea; 
 private jbutton returnbut1; 
 private jbutton cancelbut; 
 /* 
 * 用户界面 
 * */ 
 private vector<string> buyitem; 
 private float[] buycount; 
 private int buynum; 
 private jcombobox goodscombox; 
 private jbutton returnbut2; 
 private jlabel choicegoodlabel; 
 private jlabel showpricelabel; 
 private jtextfield showprice; 
 private textarea showchoice; 
 private jlabel showbuynum; 
 private jtextfield showbuynumtext; 
 private jbutton submitbuy; 
 private jbutton deletebuybut; 
 private jlist choicelist; 
 private jbutton countbut; 
 private float summoney; 
 /** 
  * 数据库导入 
  */ 
  statement stmt; 
 mainwinow(string winname) throws sqlexception{ 
  super(winname); 
  goodsnum=0; 
  buynum=0; 
  summoney=(float)0; 
  goods=new goods(); 
  user=new jbutton("我是用户"); 
  manager=new jbutton("我是管理员"); 
  loginlabel=new jlabel("请选择角色!"); 
  magwin=new managewindow("设置商品"); 
  magwin.setbounds(300, 300, 500, 400); 
  magwin.setdefaultcloseoperation(do_nothing_on_close); 
  userwin=new userwindow("欢迎选购"); 
  userwin.setbounds(300, 300, 500, 400); 
  userwin.setdefaultcloseoperation(do_nothing_on_close); 
  lis=new listener(); 
  /* 
  * 设置界面初始化 
  * */ 
  setnamelabel=new jlabel("商品名:"); 
  setpricelabel=new jlabel("价格:"); 
  setnametext=new jtextfield(5); 
  setpricetext=new jtextfield(5); 
  inputbut=new jbutton("确认添加"); 
  inputarea=new textarea(); 
  returnbut1=new jbutton("返回"); 
  cancelbut=new jbutton("撤回添加"); 
  /* 
  * 用户界面初始化 
  * */ 
  goodscombox=new jcombobox(); 
  returnbut2=new jbutton("返回"); 
  choicegoodlabel=new jlabel("请选择商品:"); 
  showpricelabel=new jlabel("价格"); 
  showprice=new jtextfield(5); 
  showchoice=new textarea(); 
  showbuynum=new jlabel("购买数量:"); 
  showbuynumtext=new jtextfield(5); 
  submitbuy=new jbutton("确认购买"); 
  deletebuybut=new jbutton("删除订单"); 
  countbut=new jbutton("订单结算"); 
  choicelist=new jlist(); 
  buyitem=new vector<string>(); 
  buycount=new float[100]; 
  /* 
   * 数据库的导入 
   * */ 
  try { 
   class.forname("com.mysql.jdbc.driver"); 
  } catch (classnotfoundexception e) { 
   // todo auto-generated catch block 
   e.printstacktrace(); 
  } 
  string url= "jdbc:mysql://localhost:3306/device"; 
  string user="root"; 
  string password="zjq1314520"; 
  connection con=drivermanager.getconnection(url,user,password); 
  stmt = con.createstatement(); 
  /* 
   * 数据库数据的导出 
   * */ 
  importsql(); 
 } 
 public void importsql() throws sqlexception { 
  int i=1; 
  // todo auto-generated method stub 
  resultset result=stmt.executequery( 
    "select name,price from goods_info" 
    ); 
  while(result.next()){ 
   goods.name[i-1]=result.getstring(1); 
   goods.price[i-1]=float.parsefloat(result.getstring(2)); 
   i++; 
  } 
  goodsnum=i-1; 
 } 
 public void setwin(mainwinow w){ 
  loginwin=w; 
 } 
 public void setminwindowlayout(){ 
  container logincon=new container(); 
  logincon.setlayout(new flowlayout()); 
  logincon.add(manager); 
  logincon.add(user); 
   
  manager.addactionlistener(lis); 
  user.addactionlistener(lis); 
  this.setlayout(new borderlayout()); 
  this.add(loginlabel,borderlayout.north); 
  this.add(logincon,borderlayout.center); 
  this.validate(); 
  /* 
  * 设置界面布局 
  * */ 
  magwin.setlayout(new flowlayout()); 
  magwin.add(setnamelabel); 
  magwin.add(setnametext); 
  magwin.add(setpricelabel); 
  magwin.add(setpricetext); 
  magwin.add(inputbut); 
  magwin.add(inputarea); 
  magwin.add(cancelbut); 
  magwin.add(returnbut1); 
   
  inputbut.addactionlistener(lis); 
  returnbut1.addactionlistener(lis); 
  cancelbut.addactionlistener(lis); 
  /* 
  * 用户界面布局 
  * */ 
  userwin.setlayout(new borderlayout()); 
  container usercon=new container(); 
  usercon.setlayout(new flowlayout()); 
  usercon.add(choicegoodlabel); 
  usercon.add(goodscombox); 
  usercon.add(showpricelabel); 
  usercon.add(showprice); 
  usercon.add(showbuynum); 
  usercon.add(showbuynumtext); 
  usercon.add(submitbuy); 
  userwin.add(usercon,borderlayout.north); 
  //choicelist.setlistdata(goods.name); 
  userwin.add(choicelist,borderlayout.center); 
  userwin.add(new jscrollpane(choicelist)); 
   
  container butcon=new container(); 
  butcon.setlayout(new flowlayout()); 
  butcon.add(deletebuybut); 
  butcon.add(countbut); 
  butcon.add(returnbut2); 
  userwin.add(butcon,borderlayout.south); 
   
  goodscombox.additemlistener( 
   new itemlistener(){ 
   @override 
    public void itemstatechanged(itemevent e) { 
    // todo auto-generated method stub 
    int i=goodscombox.getselectedindex(); 
    if(i>=0)showprice.settext(goods.price[i].tostring()); 
   } 
  } 
  ); 
  returnbut2.addactionlistener(lis); 
  submitbuy.addactionlistener(lis); 
  deletebuybut.addactionlistener(lis); 
  countbut.addactionlistener(lis); 
 } 
  
 private void addcomboxitem() { 
  // todo auto-generated method stub 
  for(int i=0;i<goodsnum;i++){ 
   goodscombox.additem(goods.name[i]); 
  } 
 } 
  
 class listener implements actionlistener{ 
  @override 
   public void actionperformed(actionevent e) { 
   // todo auto-generated method stub 
   if(e.getsource()==manager){ 
    addgoods(); 
    loginwin.setvisible(false); 
    magwin.setvisible(true); 
   } 
   if(e.getsource()==user){ 
    loginwin.setvisible(false); 
    userwin.setvisible(true); 
    goodscombox.removeallitems(); 
    addcomboxitem(); 
   } 
   if(e.getsource()==inputbut){ 
    //string showout=""; 
     
    if(setnametext.gettext().equals("")||setpricetext.gettext().equals("")){ 
     joptionpane.showmessagedialog(magwin,"不可以有空余项!", "警告",joptionpane.plain_message); 
    } 
    else{ 
     goods.name[goodsnum]=setnametext.gettext(); 
     goods.price[goodsnum]=float.parsefloat(setpricetext.gettext()); 
     try { 
      /* 
       * 写进数据库 
       * */ 
      stmt.executeupdate("insert into goods_info(name,price)values('"+goods.name[goodsnum]+"','"+(float)goods.price[goodsnum]+"')"); 
     } catch (sqlexception e1) { 
      // todo auto-generated catch block 
      e1.printstacktrace(); 
     } 
     goodsnum++; 
     addgoods(); 
     setnametext.settext(""); 
     setpricetext.settext(""); 
     //showout="商品名:"+setnametext.gettext()+"\t"+"价格:"+setpricetext.gettext()+"\n"; 
     //inputarea.append(showout); 
    } 
   } 
   if(e.getsource()==cancelbut){ 
    if(goodsnum>0){ 
     goodsnum--; 
     string deletename=goods.name[goodsnum]; 
     string deleteprice=goods.price[goodsnum].tostring(); 
     //system.out.println(deletename); 
     /* 
      * 删除数据库里面的元素 
      * */ 
     string sql = "delete from goods_info where name = '"+deletename+"' and price ='"+deleteprice+"'"; 
     try { 
      stmt.executeupdate(sql); 
     } catch (sqlexception e1) { 
      // todo auto-generated catch block 
      e1.printstacktrace(); 
     } 
     //connection con= dbmanager .getconnection();; 
     //preparedstatement ps = con.preparestatement(sql); 
     addgoods(); 
    } 
   } 
   if(e.getsource()==returnbut1){ 
    loginwin.setvisible(true); 
    magwin.setvisible(false); 
   } 
   /* 
   * 用户界面事件响应 
   * */ 
   if(e.getsource()==returnbut2){ 
    loginwin.setvisible(true); 
    userwin.setvisible(false); 
   } 
   if(e.getsource()==submitbuy){ 
     if(!showbuynumtext.gettext().equals("")){ 
      buycount[goodscombox.getselectedindex()]=float.parsefloat(showbuynumtext.gettext()); 
     string contentitem=""; 
     float summon=float.parsefloat(showbuynumtext.gettext())*(float)goods.price[goodscombox.getselectedindex()]; 
     contentitem="商品名："+goods.name[goodscombox.getselectedindex()]+" " 
      +"单价："+goods.price[goodscombox.getselectedindex()].tostring()+" " 
      +"购买数量："+showbuynumtext.gettext()+" " 
      +"总价："+summon.tostring(); 
     buyitem.addelement(contentitem); 
     //buyitem[buynum]=contentitem; 
     buynum++; 
     choicelist.removeall(); 
     choicelist.setlistdata(buyitem); 
     summoney+=summon; 
    } 
    else{ 
     joptionpane.showmessagedialog(magwin,"购买数量不可以为空", "警告",joptionpane.plain_message); 
    } 
     
   } 
   if(e.getsource()==deletebuybut){ 
    if(choicelist.getselectedvalue()==null){ 
     joptionpane.showmessagedialog(magwin,"未选择待删除的物品", "警告",joptionpane.plain_message);     
    } 
    else if(buynum>0){ 
     int i=choicelist.getselectedindex(); 
     string selectitem=buyitem.get(i); 
     //system.out.println(selectitem); 
     string deleteprice=""; 
     for(int j=0;j<selectitem.length()-3;j++){ 
     // system.out.println(selectitem.substring(j, j+3)); 
      if(selectitem.substring(j, j+3).equals("总价：")){ 
       deleteprice=selectitem.substring(j+3,selectitem.length()); 
       system.out.println(deleteprice); 
       summoney-=float.parsefloat(deleteprice); 
       break; 
      } 
     } 
     buyitem.remove(i); 
     choicelist.removeall(); 
     choicelist.setlistdata(buyitem); 
     choicelist.validate(); 
     buynum--; 
    } 
    else{ 
     joptionpane.showmessagedialog(magwin,"购物车为空,不可删除", "警告",joptionpane.plain_message); 
    } 
   } 
   if(e.getsource()==countbut){//summoney 
    for(int i=0;i<buyitem.size();i++){ 
     string str=buyitem.get(i).substring(0, 2); 
     if(str.equals("总价")){ 
      buyitem.remove(i); 
     } 
    } 
    buyitem.addelement("总价："+summoney.tostring()); 
    choicelist.removeall(); 
    choicelist.setlistdata(buyitem); 
    choicelist.validate(); 
   } 
  } 
   
  private void addgoods() { 
   if(!inputarea.gettext().equals(""))inputarea.settext(""); 
   // todo auto-generated method stub 
   for(int i=0;i<goodsnum;i++){ 
    string massage="商品名:"+goods.name[i]+"\t"+"价格:"+goods.price[i].tostring()+"\n"; 
    inputarea.append(massage); 
   } 
  } 
 } 
} 
class managewindow extends jframe { 
 managewindow(string title){ 
  super(title); 
 } 
} 
class userwindow extends jframe{ 
 userwindow(string title){ 
  super(title); 
 } 
} 

删除有关数据库部分便可以在自己电脑上运行！

有关截图：

管理员界面：

用户界面：

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