myeclipse中实现购物车后台的商品修改功能 使用jsp和servlet完成
GoodsBean：package shop;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Collection;
import bean.DBBean2;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.sql.*;
import java.util.ArrayList;
public class GoodsBean {
private String cid;
private String cname;
private String cimage;
private int cnumber;
private float cprice;
private String cintro;
public void setCid(String cid){
this.cid=cid;
}
public String getCid(){
return this.cid;
}
public void setCname(String cname){
this.cname=cname;
}
public String getCname(){
return this.cname;
}
public void setCimage(String cimage){
this.cimage=cimage;
}
public String getCimage(){
return this.cimage;
}
public void setCnumber(int cnumber){
this.cnumber=cnumber;
}
public int getCnumber(){
return this.cnumber;
}
public void setCprice(float cprice){
this.cprice=cprice;
}
public float getCprice(){
return this.cprice;
}
public void setCintro(String cintro){
this.cintro=cintro;
}
public String getCintro(){
return this.cintro;
}
public boolean add() throws Exception{
boolean mark=false;
DBBean2 db=new DBBean2();
File file=new File(cimage);
float l1=file.length();
int l2=(int)l1;
// FileInputStream fis=new FileInputStream(file);
InputStream fis=new FileInputStream(file);
String sql="insert into goods values (?,?,?,?,?,?)";
PreparedStatement pstmt=null;
Connection conn=null;
try{
conn=db.createConn();
pstmt=conn.prepareStatement(sql);
pstmt.setString(1,cid);
pstmt.setString(2,cname);
pstmt.setInt(3,cnumber);
pstmt.setFloat(4,cprice);
pstmt.setString(5,cintro);
pstmt.setBinaryStream(6,fis,l2);
mark=pstmt.execute();
}catch(Exception e){
System.out.println(e.toString());
}finally{
try {pstmt.close();}catch(Exception e){}
try {fis.close();}catch(Exception e){}
try {conn.close();}catch(Exception e){}
}
return mark;
}
//修改商品信息
public void modifyGoods(GoodsBean goods){
DBBean2 db=new DBBean2();
PreparedStatement pstmt=null;
Connection conn=null;
try{
conn=db.createConn();
PreparedStatement preparedStatement=conn.prepareStatement("update goods set cname=?,cprice=?,Image=? where cid=?");
//preparedStatement.setString(1, goods.getGoodID());
preparedStatement.setString(1, goods.getCname());
preparedStatement.setFloat(2, goods.getCprice());
preparedStatement.setString(3, goods.getCimage());
preparedStatement.setString(4, goods.getCid());
preparedStatement.executeUpdate();
}catch(Exception e){
e.printStackTrace();
}
}
//获取所有的商品信息
public ArrayList getGoodsByPage(int pageNo){
ArrayList goodslist=new ArrayList();
DBBean2 db=new DBBean2();
int begin=(pageNo-1)*5+1;
int end=pageNo*5;
int index=0;
String sql="select * from goods";
ResultSet rs=null;
try{
rs=db.executeQuery(sql);
while(rs.next()){
index++;
if(index<begin) continue;
if(index>end) break;
String tmpCid=rs.getString(1);
String tmpCname=rs.getString(2);
String tmpCimage=rs.getString(3);
float tmpCprice=rs.getFloat(5);
//InputStream in=rs.getBinaryStream(6);
//写入到JavaBean中
GoodsBean g=new GoodsBean();
g.setCid(tmpCid);
g.setCname(tmpCname);
g.setCimage(tmpCimage);
g.setCprice(tmpCprice);
goodslist.add(g);
}
}catch(Exception e){
e.printStackTrace();
}finally{
db.close();
}
return goodslist;
}
//获取页码总数
public int getPageCount(){
DBBean2 db=new DBBean2();
String sql="select count(*) from goods";
ResultSet rs=null;
int pageCount=1;
try{
rs=db.executeQuery(sql);
rs.next();
int n=rs.getInt(1);
pageCount=(int)((n-1)/5+1);
}catch(Exception e){
e.printStackTrace();
}finally{
db.close();
}
return pageCount;
}
// 根据商品号获得商品信息
public GoodsBean getGoodsByGoodsId(String s) {
GoodsBean goods = new GoodsBean();
DBBean2 db=new DBBean2();
PreparedStatement pstmt=null;
Connection conn=null;
try {
conn=db.createConn();
Statement statement = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet resultSet = statement.executeQuery("select * from goods where cid ='" + s+ "'");
while (resultSet.next()) {
String i =resultSet.getString(1);
goods.setCid(i);
goods.setCname(resultSet.getString(2));
goods.setCimage(resultSet.getString(3));
goods.setCnumber(resultSet.getInt(4));
goods.setCprice(resultSet.getFloat(5));
}
statement.close();
} catch (Exception e) {
e.printStackTrace();
}
return goods;
}
//根据商品名称获得商品信息
public Collection getGoodsByGoodName(String s){
GoodsBean goods;
ArrayList arrayList=new ArrayList();
DBBean2 db=new DBBean2();
PreparedStatement pstmt=null;
Connection conn=null;
try {
Statement statement = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE);
ResultSet resultSet = statement.executeQuery("select * from goods where cname ='" + s+ "'");
while (resultSet.next()) {
goods = new GoodsBean();
goods.setCid(resultSet.getString(1));
goods.setCname(resultSet.getString(2));
goods.setCimage(resultSet.getString(3));
goods.setCnumber(resultSet.getInt(4));
goods.setCprice(resultSet.getFloat(5));
arrayList.add(goods);
}
statement.close();
} catch (Exception e) {
e.printStackTrace();
}
return arrayList;
}
public GoodsBean findGoodsById(String cid){
try{
String sql="select * from goods where cid = '"+cid+"'";
DBBean2 db=new DBBean2();
ResultSet rs=null;
rs=db.executeQuery(sql);
if(rs.next()){
String cname=rs.getString(2);
float cprice=rs.getFloat(5);
GoodsBean temp=new GoodsBean();
temp.setCname(cname);
temp.setCid(cid);
temp.setCprice(cprice);
db.close();
return temp;
}else{
return null;
}
}catch(Exception e){
System.out.print(e.toString());
return null;
}
}
}
ModifyGoods.jsp
<%@ page contentType="text/html; charset=gb2312" language="java" import="java.sql.*" errorPage="" %>
<%@page import="shop.GoodsBean"%>
<%@ page import="bean.DBBean2" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script language=javascript>
function checkinfo(){
if(checkspace(document.modify.cname.value)){
document.modify.cname.focus();
alert("对不起,请填写商品名!");
return false;
}
if(checkspace(document.modify.cprice.value)){
document.modify.cprice.focus();
alert("对不起,请填写价格!");
return false;
}
}
function checkspace(checkstr){
var str='';
for(i=0;i<checkstr.length;i++){
str=str+'';
}
return (str==checkstr);
}
</script>
</head>
<body >
<a href="index.jsp">返回首页</a>
<a href="maneger.jsp">返回管理界面</a>
<div>
<%
String cid=request.getParameter("cid").toString();
GoodsBean goodB=new GoodsBean();
goodB=goodB.getGoodsByGoodsId(cid);
session.setAttribute("cid",cid);
%>
<form id="modify" name="modify" action="ModifyGoods" action="post">
<table width="412" border="1">
<tr>
<td > 编号：</td>
<td> <%=goodB.getCid() %></td>
</tr><tr>
<td> 名称：</td>
<td> <input name="goodName" type="text" value="<%=goodB.getCname() %>"/></td>
</tr><tr>
<td> 价格：</td>
<td> <input name="goodPrice" type="text" value="<%=goodB.getCprice() %>"/></td>
</tr><tr>
<td> 选择商品图片</td>
<td> <input name="image" type="file" /></td>
</tr><tr>
<td><input type="submit" name="submit1" value="提交" onclick="return checkinfo()"/></td>
</tr>
</table>
</form>
</div>
</body>
</html>
ModifGoodsServlet:
package shop;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Calendar;
import java.io.IOException;
import java.io.PrintWriter;
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.jspsmart.upload.SmartUpload;
import bean.DBBean2;
import bean.ZhuanHuan;
import shop.GoodsBean;
import bean.CopyFile;
public class ModifyGoods 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");
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();
}
/**
* 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 {
Calendar calendar=Calendar.getInstance();
response.setContentType("text/html");
HttpSession session=request.getSession();//
String cid=(String)session.getAttribute("cid");//
GoodsBean goodB=new GoodsBean();
String cname=ZhuanHuan.toChinese(request.getParameter("cname"));
float cprice=Float.parseFloat(request.getParameter("cprice"));
String image=request.getParameter("image");
//把图片提取出来存放到以下路径
String imageSort=image.substring(image.lastIndexOf(".")-1);
String dest="H:/jspex/jspclass/WebRoot/image/"+String.valueOf(calendar.getTimeInMillis())+imageSort;
goodB.setCid(cid);
goodB.setCname(cname);
goodB.setCprice(cprice);
goodB.setCimage(dest);
CopyFile cp=new CopyFile();
cp.copyFile(image, dest);
goodB.modifyGoods(goodB);
response.sendRedirect("showgoods.jsp");
}
/**
* Initialization of the servlet. <br>
*
* @throws ServletException if an error occurs
*/
public void init() throws ServletException {
// Put your code here
}
}
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servlet 购物车 private package public
----------------解决方案--------------------------------------------------------
购物车功能，怎么在MyEclipse中修改商品信息，以上是我的GoodsBean，ModifyGoods.jsp，ModifyGoodsServlet 可是在运行时老报错，请高手们指正！！！
----------------解决方案--------------------------------------------------------