电子商务系统的一些代码

电子商务系统的一些代码

（一）、经常用的过滤器

 1 package  com.ascent.util;
 2
 3 import  java.io.IOException;
 4 import  javax.servlet.Filter;
 5 import  javax.servlet.FilterChain;
 6 import  javax.servlet.FilterConfig;
 7 import  javax.servlet.ServletException;
 8 import  javax.servlet.ServletRequest;
 9 import  javax.servlet.ServletResponse;
10 import  javax.servlet.UnavailableException;
11
12 /** */ /**
13 * Example filter that sets the character encoding to be used in parsing the
14 * incoming request
15 */
16 public   class  SetCharacterEncodingFilter  implements  Filter  {
17
18    /** *//**
19     * Take this filter out of service.
20     */
21    public void destroy() {
22    }
23    /** *//**
24     * Select and set (if specified) the character encoding to be used to
25     * interpret request parameters for this request.
26     */
27    public void doFilter(ServletRequest request, ServletResponse response,
28    FilterChain chain)throws IOException, ServletException {
29
30    request.setCharacterEncoding("gb2312");
31
32    // 传递控制到下一个过滤器
33    chain.doFilter(request, response);
34    }
35
36    public void init(FilterConfig filterConfig) throws ServletException {
37    }
38}
39

（二）、购物车类代码

package  com.ascent.util;

import  java.util.HashMap;

import  com.ascent.po.Product;

public   class  ShopCart  {
    private HashMap<String, Product> hashMap;
    
    public HashMap<String, Product> getHashMap() {
        return hashMap;
    }

    public void setHashMap(HashMap<String, Product> hashMap) {
        this.hashMap = hashMap;
    }

    @SuppressWarnings("unchecked")
    public ShopCart(){
        hashMap = new HashMap();
    }
    
    /** *//**
     * 检查hashmap中是否有了该pid对应的对象方法
     * @param pid
     * @return true：有   false：无
     */
    public boolean checkPid(String pid){
        if(hashMap.containsKey(pid)){
            return true;
        }else{
            return false;
        }
    }
    /** *//**
     * 在上面方法返回false情况下添加product
     * @param pid
     * @param product
     */
    public void addProduct(String pid,Product product){
        hashMap.put(pid, product);
    }
    
    /** *//**
     * 根据id删除hashmap中的product
     * @param pid
     */
    public void delProduct(String pid){
        hashMap.remove(pid);
    }
    
    /** *//**
     * 修改hashmap中pid对应product的质量quantity
     * @param pid
     * @param quantity
     */
    public void updateQuantity(String pid,String quantity){
        hashMap.get(pid).setQuantity(quantity);
    }
    
    /** *//**
     * 清除购物车
     */
    public void emptyCart(){
        this.getHashMap().clear();
    }
}

（三）、分页算法

// 分页类
package  com.ascent.util;
import  java.util. * ;
/** */ /**
 * @author Administrator
 * @version 负责页面控制的 JavaBean
 */
public   class  PageBean  {            
    public int currentPage;                // 当前页数
    public int totalPage;                // 总页数
    public int totalRows;                // 总行数
    public int rowsPage = 5;            // 每页显示多少行
    public ArrayList data;                // 封装页面显示的数据
    public PageBean(){}
    public void countTotalPage(){        // 计算总页数
        if(totalRows%rowsPage==0){
            this.totalPage = totalRows/rowsPage;
        }
        else{
            this.totalPage = totalRows/rowsPage + 1;
        }
    }
    public ArrayList getData(){                
        return data;
    }
    
    public PageBean(int totalRows){
        this.totalRows = totalRows;
        this.countTotalPage();
    }
}




     //  分页算法
     public  String guestPageShow()  throws  Exception  {
        this.pageReturn();
        return "guestproductsshow";
    }

    @SuppressWarnings( " unchecked " )
     private   void  pageReturn()  {
        String jump_page = this.getJumpPage();
        if (jump_page == null) {
            jump_page = "1";
        }
        PageBean page = this.listData(jump_page);
        ActionContext.getContext().getSession().put("product_page_list", page);
        this.setDataList(page.getData());
    }

     public  PageBean listData(String number)  {
        PageBean page = new PageBean(productService.getTotalRows());
        int num = Integer.parseInt(number);
        String sql = "from Product p where delFlag=0 order by p.pid";
        page.data = productService.getData(sql, page.rowsPage * (num - 1),
                page.rowsPage);
        page.currentPage = num;
        return page;

    }

     //  分页算法


// 实现
                PageBean page = this .listData( " 1 " );
                ActionContext.getContext().getSession().put( " productuser_page_list " , page);
                
                 this .setDataList(page.getData());



// jsp方面

   <%
 PageBean pBean  =  (PageBean)session.getAttribute( " productuser_page_list " );
  %>
  <%
  if (pBean.totalPage != 1 ) {  
 %>   
       <form name="pageForm" action="pageProductuserManagerAction.action" method="post">         
      <%@ include file="page.jsp" %>   
      </form>         
      <%}   %>     

// page.jsp

<% @ page language = " java "   import = " java.util.* "  pageEncoding = " gb2312 " %>

   < script language = " JavaScript " >
    function Jumping() {
       document.pageForm.submit();         
    }     
    function gotoPage(pagenum) {
        //alert(pagenum);
        //alert(document.pageForm.jumpPage.value);
       document.pageForm.jumpPage.value = pagenum;
       document.pageForm.submit();       
    }
   </ script >     
         < table >   
           < tr >
             < td > 每页 <%= pBean.rowsPage %> 行 </ td >
             < td > 共 <%= pBean.totalRows %> 行 </ td >
             < td > 第 <%= pBean.currentPage %> 页 </ td >< td > 共 <%= pBean.totalPage %> 页 </ td >
             < td >
                 <% if (pBean.currentPage == 1 ) {out.print("首页　上一页");} else {%>
              <a href="javascript:gotoPage(1)">首页</a>
              <a href="javascript:gotoPage(<%=pBean.currentPage-1%>)">上一页</a>
              <%
              }
                %>  
                <% if (pBean.currentPage == pBean.totalPage) {out.print("下一页　尾页");} else {%>
               <a href="javascript:gotoPage(<%=pBean.currentPage+1%>)">下一页</a>
               <a href="javascript:gotoPage(<%=pBean.totalPage%>)">尾页</a>
               <%}   %>
             </ td >
             < td >                 
                     转到第 < select name = " jumpPage "  onchange = " Jumping() " >
                       <% for ( int  i = 1 ;i <= pBean.totalPage;i ++ ) {
                          if(i==pBean.currentPage){
                      %>
                      
                      <option selected value=<%=i%>><%=i%></option>
                      <%
                      }
                      else
                      {
                       %>
                       <option value=<%=i%>><%=i%></option>
                       <%
                       }
                       }
                         %>
                         </ select > 页
               </ td >
           </ tr >
         </ table >
      
        

这个ssh项目的配置文件