购物系统①

因为有上学期的自己和同学的demo。所以进度比较快。

到目前为止。使用smartUpload做好了上传商品功能，同时支持删除商品功能。

期间遇到两个问题。用smartUpload上传商品的时候，

如果是使用绝对路径的话，在自己所建立的upload文件夹中是不会出现你上传的照片的。如下图图一图二所示

                                             图一

                              

                                            图二

所以我改用同学的使用相对路径进行保存

                               

                                                   图三

                      

                                                   图四

                                                   

                              

                                                  图五

问题二

在guanli.jsp中，我把xuhao 写成了xuehao。导致在在shopservlet中获取不了这个值，所以删除不了，最后顺利解决了这个问题！

                    

                

备注：

1.附上到目前为止的源代码和截图

2.所有代码都是我全部重新敲过，建议大伙可以自己多敲敲代码

3.在shopservlet.java中把接下来需要的功能代码全都复制进去了。也就是说shopservlet.jsp后期不能再增加内容了

                                     

DBbean.java

package bean;


import java.sql.*;
//import javax.sql.*;

//import javax.naming.Context;
//import javax.naming.InitialContext;

public class DBbean 
{
    static Connection con;
    static String url;
    static String driverName="com.mysql.jdbc.Driver";
    static String userName="root";
    static String userPassword="123456";
    static String dbName="dbtemp";
    
    public DBbean() throws ClassNotFoundException,SQLException
    {
        url="jdbc:mysql://localhost/"+dbName+"?autoReconnect=true&useUnicode=true&characterEncoding=GBK&user="+userName+"&password="+userPassword;
    }
    public static Connection getDBConnection()
    {
        try{
            Class.forName("com.mysql.jdbc.Driver");//加载驱动
            con=DriverManager.getConnection(url);
        }catch(ClassNotFoundException e){
                    }catch(SQLException e){}
        return con;
    }
    /*public static Connection getPoolConnection()
    {
        try{
            Context ctx=new InitialContext();//向上转型，Context是java.name包中的一个接口，用于查找数据库连接池的配置文件
            ctx=(Context)ctx.lookup("java:com/env");
            DataSource ds=(DataSource)ctx.lookup("DBPool");
            con=ds.getConnection();
            
        }catch(Exception e)
        {
            e.printStackTrace();
        }
        return con;
    }*/
    //运行更新。插入。删除操作
    public static void executesql(String query)throws SQLException
    {
        Statement stmt=null;
        try{
            stmt=DBbean.getDBConnection().createStatement();
            stmt.execute(query);
            stmt.close();
        }catch(SQLException e){}
        
    }
    //查询一个整数字段值
    public int getIntResult(String query)throws SQLException
    {
        Statement stmt=null;
        int i=0;
        try{
            stmt=DBbean.getDBConnection().createStatement();
            //stmt=DBbean.getPoolConncetion().creatStatement();
            ResultSet rs=stmt.executeQuery(query);
            while(rs.next())
            {
                i=Integer.parseInt(rs.getString(1));
                
            }
            stmt.close();
            con.close();
        }catch(SQLException e){}
        return i;
    }
    //查询一个字符串字段值
    public String getOneStringResult(String query,int i)throws SQLException
    {
        Statement stmt=null;
        ResultSet rs=null;
        String str="Null";
        try{
            stmt=DBbean.getDBConnection().createStatement();
            //stmt=DBbean.getPoolConnection().creatStatement();
            rs=stmt.executeQuery(query);
            while(rs.next())
            {
                str=rs.getString(i);                
            }
            stmt.close();
            con.close();
        }catch(SQLException e){}
        return str;
    }
    //查询返回一个结果集
    public static ResultSet getResultSet(String query)throws SQLException
    {
        ResultSet rs=null;
        Statement stmt=null;
        try{
            stmt=DBbean.getDBConnection().createStatement();
            rs=stmt.executeQuery(query);
            
        }catch(SQLException e){
            e.printStackTrace();
        }
        return rs;
    }
    //查询一个字段的结果集，并以字符串数组形式返回
    public String[] getResultSetToStr(String query)throws SQLException
    {
        ResultSet rs1=null,rs2=null;
        int i=0,counter=0;
        String[] name=null;
        Statement stmt1=null,stmt2=null;
        try{
            stmt1=DBbean.getDBConnection().createStatement();
            rs2=stmt1.executeQuery(query);
            while(rs2.next())
            {
                counter++;
            }
            stmt2=DBbean.getDBConnection().createStatement();
            rs1=stmt2.executeQuery(query);
            name=new String[counter];
            while(rs1.next())
            {
                name[i]=rs1.getString(1);
                i++;
            }
            
        }catch(SQLException e)
        {
            e.printStackTrace();
        }
        rs1.close();
        rs2.close();
        stmt1.close();
        stmt2.close();
        con.close();
        return name;
        
    }
    public static boolean execute(String query)
    {
        boolean result=false;
        Statement stmt=null;
        try{
            stmt=DBbean.getDBConnection().createStatement();
            result=stmt.execute(query);
            
        }catch(SQLException e){}
        return result;
    }
    public void closeon() throws SQLException
    {
        con.close();
    }

}

shopservlet.java

package servlet;

import java.io.IOException;
import java.sql.ResultSet;
import java.sql.SQLException;

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

import bean.DBbean;

/**
 * Servlet implementation class shopservlet
 */
@WebServlet("/shopservlet")
public class shopservlet extends HttpServlet 
{
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public shopservlet()
    {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {
        // TODO Auto-generated method stub
        doPost(request,response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {
        // TODO Auto-generated method stub
        request.setCharacterEncoding("gbk");
        String action=request.getParameter("action");
        if(action.equals("delete"))
        {
            String a=request.getParameter("xuhao");
            String sql="delete from shop where xuhao='"+a+"'";
            try{
                DBbean.executesql(sql);
            }catch(SQLException e){
                //TODO Auto-generated catch block
                e.printStackTrace();
            }
            response.sendRedirect("guanli.jsp");
        }
        if(action.equals("delete2"))
        {
            String a=request.getParameter("xuhao");
            String sql="delete from cart where xuhao='"+"'";
            try{
                DBbean.executesql(sql);
                
            }catch(SQLException e){
                //TODO Auto-generated catch block
                e.printStackTrace();
            }
            response.sendRedirect("cart.jsp");
        }
        if(action.equals("jian"))
        {
            String a=request.getParameter("xuhao");
            String sql="update cart set shuliang=shuliang-1 where xuhao='"+a+"'";
            try{
                DBbean.executesql(sql);
            }catch(SQLException e){
                //TODO Auto-generated catch block
                e.printStackTrace();
            }
            response.sendRedirect("car.jsp");
        }
        if(action.equals("jia"))
        {
            String a=request.getParameter("xuhao");
            String sql="update cart set shuliang =shuliang+1 where xuhao='"+a+"'";
            try {
                DBbean.executesql(sql);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            response.sendRedirect("cart.jsp");
        }
        if(action.equals("update"))
        {
            String a=request.getParameter("xuhao");
            String b=request.getParameter("mingchen");
            //b=new String(b.getBytes("ISO-8859-1"),"gbk");
            String c=request.getParameter("miaoshu");
            //c=new String(c.getBytes("ISO-8859-1"),"gbk");
            String d=request.getParameter("jiege");
            String e=request.getParameter("cunhuo");
            String f=request.getParameter("zhuangtai");
            //f=new String(f.getBytes("ISO-8859-1"),"gbk");
            String sql="update shop set ";
            sql=sql+"mingchen='"+b+"', miaoshu='"+c+"', jiege='"+d+"', cunhuo='"+e+"', zhuangtai='"+f+"'";
            sql=sql+" where xuhao='"+a+"'";
            try {
                DBbean.executesql(sql);
            } catch (SQLException e1) {
                // TODO Auto-generated catch block
                e1.printStackTrace();
            }
            response.sendRedirect("guanli.jsp");
        }
        if(action.equals("qingkong"))
        {
            String sql="delete from cart";
            try {
                DBbean.executesql(sql);
            } catch (SQLException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
            response.sendRedirect("home.jsp");
        }
        if(action.equals("upordown"))
        {
            String a=request.getParameter("xuhao");
            String b=new String(request.getParameter("zhuangtai").getBytes("iso-8859-1"),"gbk");
            String sql2=null;
            try{
                if(b.equals("下架"))
                {
                    sql2="update shop set zhuangtai='上架' where  xuhao='"+a+"'";
                    DBbean.executesql(sql2);
                }
                if(b.equals("上架"))
                {
                    sql2="update shop set zhuangtai='上架' where xuhao='"+a+"'";
                    DBbean.execute(sql2);
                }
            }catch(SQLException e){
                //TODO Auto-generated catch block
                e.printStackTrace();
            }
            response.sendRedirect("guanli.jsp");
        }
    }

}

uploadservlet.java

package servlet;

import java.io.IOException;
import java.sql.SQLException;

import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import bean.DBbean;

import com.jspsmart.upload.File;
import com.jspsmart.upload.SmartUpload;
import com.jspsmart.upload.SmartUploadException;

/**
 * Servlet implementation class uploadservlet
 */
@WebServlet("/uploadservlet")
public class uploadservlet extends HttpServlet 
{
    private static final long serialVersionUID = 1L;
    private static final int SAVEAS_PHYSICAL=0;
    ServletConfig servletconfig;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public uploadservlet() 
    {
        super();
        // TODO Auto-generated constructor stub
    }
    public void init(ServletConfig config)throws ServletException
    {
        this.servletconfig=config;
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {
        // TODO Auto-generated method stub
        doPost(request,response);
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException 
    {
        // TODO Auto-generated method stub
        request.setCharacterEncoding("gbk");
        SmartUpload su=new SmartUpload();
        su.initialize(servletconfig, request, response);
        //limit the size of the upload's things
        su.setMaxFileSize(1000000);
        //限制总上传数据的长度
        su.setTotalMaxFileSize(2000000);
        //设定允许上传的文件（通过扩展名限制），禁止上传带有exe,bat,jsp,htm,html扩展名的文件和没有扩展名的文件。
        try{
            su.setDeniedFilesList("exe,bat,jsp,htm,html,");
        }catch(SQLException e){
            //TODO Auto-generated catch block
            e.printStackTrace();
        }
        try{
            su.upload();
        }catch(SmartUploadException e){
            //TODO Auto-generated catch block
            e.printStackTrace();
        }
        String a=su.getRequest().getParameter("xuhao");
        String b=su.getRequest().getParameter("mingchen");
        String c=su.getRequest().getParameter("miaoshu");
        String d=su.getRequest().getParameter("jiege");
        String e=su.getRequest().getParameter("cunhuo");
        String f=su.getRequest().getParameter("zhuangtai");
        File g=su.getFiles().getFile(0);//得到上传的第一个文件
        String h=b+"."+g.getFileExt();
        
        
        
        h="/upload/"+h;
        String realpath="/dingcan/WebContent";//这个要根据具体情况填写
        realpath=realpath+h;
        h="D:/Java"+realpath;//??
        System.out.println(h);
        
        
        /*String path=request.getSession().getServletContext().getRealPath("/upload");
        System.out.println(path);
         String h1="upload/"+h;*/
        
        
        
        String sql="insert into shop values(";
        //sql=sql+"'"+a+"'"+","+"'"+b+"'"+","+"'"+c+"'"+"'"+"'"+h+"'"+","+"'"+d+"'"+","+"'"+e+"'"+","+"'"+f+"'"+")";
        sql=sql+"'"+a+"'"+","+"'"+b+"'"+","+"'"+c+"'"+","+"'"+h+"'"+","+"'"+d+"'"+","+"'"+e+"'"+","+"'"+f+"'"+")";
        try{
            DBbean.executesql(sql);
        }catch(SQLException e1){
            //TODO Auto-generated catch block
            e1.printStackTrace();
        }
        try{
            g.saveAs(h, SAVEAS_PHYSICAL);//?
            //g.saveAs(path+"/"+h);
            
        }catch(SmartUploadException e1){
            //TODO Auto-generated catch block
            e1.printStackTrace();
        }
        response.sendRedirect("guanli.jsp");
    }

}

guanli.jsp

<%@ page language="java" contentType="text/html; charset=gbk"
    pageEncoding="gbk"%>
<%@ page import="com.mysql.jdbc.Driver" %>
<%@ page import="java.sql.*" %>
<%@ page import="bean.DBbean" %>
<jsp:useBean id="DBbean" scope="page" class="bean.DBbean"/>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gbk">
<title>管理商品</title>
</head>
<body>
<h1 align="center">商品列表</h1>
<%
request.setCharacterEncoding("gbk");
String sql="select * from shop";
ResultSet rs=DBbean.getResultSet(sql);
%>
<table border="1" align="center">
<tr>
    <th>商品序号</th>
    <th>商品名称</th>
    <th>商品价格</th>
    <th>商品存货</th>
    <th>上下架管理</th>
</tr>
<%while(rs.next()){%>
<tr>
    <td><%=rs.getString("xuhao") %></td>
    <td><%=rs.getString("mingchen") %></td>
    <td><%=rs.getString("jiege") %></td>
    <td><%=rs.getString("cunhuo") %></td>
    <td><a href='shopservlet?action=delete&xuhao=<%=rs.getString("xuhao") %>' onclick="return confirm('确认将此记录删除？')">删除</a></td>
    <td><a href='update.jsp?action=update&xuhao=<%=rs.getString("xuhao")%>'>修改</a></td>
    <%}
       rs.close();%>
</tr>
</table>
<form action="uploadservlet" method="post" enctype="multipart/form-data" name="upload">
<table align=center>
    <tr>
        <td align=center><h1>上传商品</h1></td>
    </tr>
    <tr>
        <td >
        序号<input type="text" name="xuhao" size="10">名称<input type="text" name="mingchen" size="20">
        价格<input type="text" name="jiege" size="10">存货<input type="text" name="cunhuo" size="10"><br>
        描述<textarea  name="miaoshu" rows="5" cols="65"></textarea><br>
        商品状态选择：<input type="radio" name="zhuangtai" value="上架" checked="checked">存入仓库<input type="radio" name="zhuangtai" value="下架">发布商品&nbsp
        上传图片<input type="file" name="tupian" size="20">
        </td>
    </tr>
    <tr>
        <td  align="center"><input value="开始上传" type="submit"></td>
    </tr>
</table>
</form>
</body>
</html>

运行界面