（一）、經(jīng)常用的過(guò)濾器
1
package com.ascent.util;
2
3import java.io.IOException;
4import javax.servlet.Filter;
5import javax.servlet.FilterChain;
6import javax.servlet.FilterConfig;
7import javax.servlet.ServletException;
8import javax.servlet.ServletRequest;
9import javax.servlet.ServletResponse;
10import javax.servlet.UnavailableException;
11
12
/** *//**
13
* Example filter that sets the character encoding to be used in parsing the
14 * incoming request
15
*/
16public 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 // 傳遞控制到下一個(gè)過(guò)濾器
33 chain.doFilter(request, response);
34 }
35
36 public void init(FilterConfig filterConfig) throws ServletException {
37 }
38}
39
（二）、購(gòu)物車(chē)類(lèi)代碼
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();
}
/** *//**
* 檢查hashmap中是否有了該pid對(duì)應(yīng)的對(duì)象方法
* @param pid
* @return true：有 false：無(wú)
*/
public boolean checkPid(String pid){
if(hashMap.containsKey(pid)){
return true;
}else{
return false;
}
}
/** *//**
* 在上面方法返回false情況下添加product
* @param pid
* @param product
*/
public void addProduct(String pid,Product product){
hashMap.put(pid, product);
}
/** *//**
* 根據(jù)id刪除hashmap中的product
* @param pid
*/
public void delProduct(String pid){
hashMap.remove(pid);
}
/** *//**
* 修改hashmap中pid對(duì)應(yīng)product的質(zhì)量quantity
* @param pid
* @param quantity
*/
public void updateQuantity(String pid,String quantity){
hashMap.get(pid).setQuantity(quantity);
}
/** *//**
* 清除購(gòu)物車(chē)
*/
public void emptyCart(){
this.getHashMap().clear();
}
}
（三）、分頁(yè)算法
//分頁(yè)類(lèi)
package com.ascent.util;
import java.util.*;
/** *//**
* @author Administrator
* @version 負(fù)責(zé)頁(yè)面控制的 JavaBean
*/
public class PageBean {
public int currentPage; // 當(dāng)前頁(yè)數(shù)
public int totalPage; // 總頁(yè)數(shù)
public int totalRows; // 總行數(shù)
public int rowsPage = 5; // 每頁(yè)顯示多少行
public ArrayList data; // 封裝頁(yè)面顯示的數(shù)據(jù)
public PageBean(){}
public void countTotalPage(){ // 計(jì)算總頁(yè)數(shù)
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();
}
}
// 分頁(yè)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;
}
// 分頁(yè)算法
//實(shí)現(xiàn)
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>每頁(yè)<%=pBean.rowsPage%>行</td>
<td>共<%=pBean.totalRows%>行</td>
<td>第<%=pBean.currentPage%>頁(yè)</td><td>共<%=pBean.totalPage%>頁(yè)</td>
<td>
<%if(pBean.currentPage==1){out.print("首頁(yè) 上一頁(yè)");}else{%>
<a href="javascript:gotoPage(1)">首頁(yè)</a>
<a href="javascript:gotoPage(<%=pBean.currentPage-1%>)">上一頁(yè)</a>
<%
}
%>
<%if(pBean.currentPage==pBean.totalPage){out.print("下一頁(yè) 尾頁(yè)");}else{%>
<a href="javascript:gotoPage(<%=pBean.currentPage+1%>)">下一頁(yè)</a>
<a href="javascript:gotoPage(<%=pBean.totalPage%>)">尾頁(yè)</a>
<%} %>
</td>
<td>
轉(zhuǎn)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>頁(yè)
</td>
</tr>
</table>
這個(gè)ssh項(xiàng)目的配置文件