SSH 分页方法一，基于struts1

先是一个page的bean： 
package com.leatherstore.other; 

public class Page { 

/** 是否有上一页 */ 
private boolean hasPrePage; 

/** 是否有下一页 */ 
private boolean hasNextPage; 

/** 每页的数量 */ 
private int everyPage; 

/** 总页数 */ 
private int totalPage; 

/** 当前页*/ 
private int currentPage; 

/** 起始点 */ 
private int beginIndex; 

/** 总记录数*/ 
private int totalCount; 

/** 
* @return totalCount 
*/ 
public int getTotalCount() { 
return totalCount; 
} 

/** 
* @param totalCount 要设置的 totalCount 
*/ 
public void setTotalCount(int totalCount) { 
this.totalCount = totalCount; 
} 

/** The default constructor */ 
public Page(){ 

} 

/** construct the page by everyPage 
* @param everyPage 
* */ 
public Page(int everyPage){ 
this.everyPage = everyPage; 
} 

/** The whole constructor */ 
public Page(boolean hasPrePage, boolean hasNextPage, 
int everyPage, int totalPage, 
int currentPage, int beginIndex,int totalCount) { 
this.hasPrePage = hasPrePage; 
this.hasNextPage = hasNextPage; 
this.everyPage = everyPage; 
this.totalPage = totalPage; 
this.currentPage = currentPage; 
this.beginIndex = beginIndex; 
this.totalCount = totalCount; 
} 

/** 
* @return 
* Returns the beginIndex. 
*/ 
public int getBeginIndex() { 
return beginIndex; 
} 

/** 
* @param beginIndex 
* The beginIndex to set. 
*/ 
public void setBeginIndex(int beginIndex) { 
this.beginIndex = beginIndex; 
} 

/** 
* @return 
* Returns the currentPage. 
*/ 
public int getCurrentPage() { 
return currentPage; 
} 

/** 
* @param currentPage 
* The currentPage to set. 
*/ 
public void setCurrentPage(int currentPage) { 
this.currentPage = currentPage; 
} 

/** 
* @return 
* Returns the everyPage. 
*/ 
public int getEveryPage() { 
return everyPage; 
} 

/** 
* @param everyPage 
* The everyPage to set. 
*/ 
public void setEveryPage(int everyPage) { 
this.everyPage = everyPage; 
} 

/** 
* @return 
* Returns the hasNextPage. 
*/ 
public boolean getHasNextPage() { 
return hasNextPage; 
} 

/** 
* @param hasNextPage 
* The hasNextPage to set. 
*/ 
public void setHasNextPage(boolean hasNextPage) { 
this.hasNextPage = hasNextPage; 
} 

/** 
* @return 
* Returns the hasPrePage. 
*/ 
public boolean getHasPrePage() { 
return hasPrePage; 
} 

/** 
* @param hasPrePage 
* The hasPrePage to set. 
*/ 
public void setHasPrePage(boolean hasPrePage) { 
this.hasPrePage = hasPrePage; 
} 

/** 
* @return Returns the totalPage. 
* 
*/ 
public int getTotalPage() { 
return totalPage; 
} 

/** 
* @param totalPage 
* The totalPage to set. 
*/ 
public void setTotalPage(int totalPage) { 
this.totalPage = totalPage; 
} 
} 
然后构建一个page的工厂PageUtil： 
package com.leatherstore.other; 

public class PageUtil { 
/** 
* Use the origin page to create a new page 
* 
* @param page 
* @param totalRecords 
* @return 
*/ 
public static Page createPage(Page page, int totalRecords) { 
return createPage(page.getEveryPage(), page.getCurrentPage(), 
totalRecords); 
} 

/** 
* the basic page utils not including exception handler 
* 
* @param everyPage 
* @param currentPage 
* @param totalRecords 
* @return page 
*/ 
public static Page createPage(int everyPage, int currentPage, 
int totalRecords) { 
everyPage = getEveryPage(everyPage); 
currentPage = getCurrentPage(currentPage); 
int beginIndex = getBeginIndex(everyPage, currentPage); 
int totalPage = getTotalPage(everyPage, totalRecords); 
boolean hasNextPage = hasNextPage(currentPage, totalPage); 
boolean hasPrePage = hasPrePage(currentPage); 

return new Page(hasPrePage, hasNextPage, everyPage, totalPage, 
currentPage, beginIndex, totalRecords); 
} 

private static int getEveryPage(int everyPage) { 
return everyPage == 0 ? 10 : everyPage; 
} 

private static int getCurrentPage(int currentPage) { 
return currentPage == 0 ? 1 : currentPage; 
} 

private static int getBeginIndex(int everyPage, int currentPage) { 
return (currentPage - 1) * everyPage; 
} 

private static int getTotalPage(int everyPage, int totalRecords) { 
int totalPage = 0; 

if (totalRecords % everyPage == 0) 
totalPage = totalRecords / everyPage; 
else 
totalPage = totalRecords / everyPage + 1; 

return totalPage; 
} 

private static boolean hasPrePage(int currentPage) { 
return currentPage == 1 ? false : true; 
} 

private static boolean hasNextPage(int currentPage, int totalPage) { 
return currentPage == totalPage || totalPage == 0 ? false : true; 
} 

} 
然后建一个专用的bean： 
package com.leatherstore.hibernate.domain; 

import java.util.List; 

import com.leatherstore.other.Page; 

public class Result { 
private Page page; //分页信息 
private List content; //每页显示的集合 
/** 
* The default constructor 
*/ 
public Result() { 
super(); 
} 

/** 
* The constructor using fields 
* 
* @param page 
* @param content 
*/ 
public Result(Page page, List content) { 
this.page = page; 
this.content = content; 
} 

/** 
* @return Returns the content. 
*/ 
public List getContent() { 
return content; 
} 

/** 
* @return Returns the page. 
*/ 
public Page getPage() { 
return page; 
} 

/** 
* @param content 
* The content to set. 
*/ 
public void setContent(List content) { 
this.content = content; 
} 

/** 
* @param page 
* The page to set. 
*/ 
public void setPage(Page page) { 
this.page = page; 
} 
} 

然后在数据访问层写两个方法： 
ProductDAO： 
public List getProductByPage(Page page); 
public int getProductCount(); //返回数据的总数 
ProductDAO的接口实现ProductDAOImpl： 
//为了在spring里统一编程风格：我用的回调的方法 
public List getProductByPage(final Page page) { 
return this.getHibernateTemplate().executeFind(new HibernateCallback(){ 
public Object doInHibernate(Session session) throws HibernateException, SQLException { 
Query query=session.createQuery("from Productinfo"); 
query.setFirstResult(page.getBeginIndex()); //hibernate分页的精髓 呵呵 
query.setMaxResults(page.getEveryPage()); 
return query.list(); 
} 
}); 
} 

public int getProductCount() { 
List list=this.getHibernateTemplate().find("select count(*) from Productinfo"); 
return ((Integer)list.iterator().next()).intValue(); 
} 
然后是业务层： 
IProduct： 
public Result listProduct(Page page); 
然后IProduct接口的实现：IProductImpl： 
private ProductDAO productDAO; 
public void setProductDAO(ProductDAO productDAO){ 
this.productDAO=productDAO; 
} 

public Result listProduct(Page page) { 
int totalRecords = this.productDAO.getProductCount(); 
page = PageUtil.createPage(page, totalRecords); 
List products = this.productDAO.getProductByPage(page); 
return new Result(page, products); 
} 
然后再代理层： 
ProductProxy： 
IProduct pro=(IProduct)AppContext.getInstance().getappcontext().getBean("productServicewithTran"); 

public Result productlist(Page page){ 
try{ 
return pro.listProduct(page); 
}catch(DataAccessException ex){ 
ex.printStackTrace(); 
return null; 
} 
} 
呵呵 终于到productAction啦 
显示前方法的代码 
Page page = new Page(); //实例化一个page对象 
page.setEveryPage(10); //设置每页显示的条数 
page.setCurrentPage(1); //为第一页 
Result result = pdp.productlist(page); 
request.setAttribute("page", pageinfo); 
request.setAttribute("productlist", list); 
return mapping.findForward("showProduct"); 
接着就是jsp页面了 
<logic:iterate id="product" name="productlist"> 
//中间迭代所要显示的数据 
</logic:iterate> 
<tr> 
<td width="80" height="30"> </td> 
<logic:equal value="true" name="page" property="hasPrePage"> 
<td width="150" height="30"><div align="right"><a href="../product.do?method=showProductByTag&index=first&msg=${msg }">首页</a></div></td> 
<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=prew&pageno=${page.currentPage -1}&msg=${msg }">上一页</a></div></td> 
</logic:equal> 
<logic:notEqual value="true" name="page" property="hasPrePage"> 
<td width="150" height="30"><div align="right">首页</div></td> 
<td width="80" height="30"><div align="center">上一页</div></td> 
</logic:notEqual> 
<logic:equal value="true" name="page" property="hasNextPage"> 
<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=next&pageno=${page.currentPage +1 }&msg=${msg }">下一页</a></div></td> 
<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=end&pageno=${page.totalPage }&msg=${msg }">尾页</a></div></td> 
</logic:equal> 
<logic:notEqual value="true" name="page" property="hasNextPage"> 
<td width="80" height="30"><div align="center">下一页</div></td> 
<td width="80" height="30"><div align="center">尾页</div></td> 
</logic:notEqual> 
<td height="30" colspan="3"><div align="center">页次${page.currentPage }/${page.totalPage }   共${page.totalCount }条记录</div> <div align="center"></div></td> 
</tr> 
可以显示相应的页面信息 
然后productAction里面的showProductByTag代码如下： 
Page page = new Page(); 
page.setEveryPage(10); 
String pagemark = request.getParameter("goto"); 
if (pagemark == null) { 
String state = request.getParameter("index"); 
String pageno = request.getParameter("pageno"); 
System.out.println("pageno=" + pageno); 
if ("first".equals(state)) { 
page.setCurrentPage(1); 
Result result = pdp.productlist(page); 
request.setAttribute("page", result.getPage()); 
request.setAttribute("productlist", result.getContent()); 
} else if ("prew".equals(state)) { 
page.setCurrentPage(Integer.parseInt(pageno)); 
Result result = pdp.productlist(page); 
request.setAttribute("page", result.getPage()); 
request.setAttribute("productlist", result.getContent()); 
} else if ("next".equals(state)) { 
page.setCurrentPage(Integer.parseInt(pageno)); 
Result result = pdp.productlist(page); 
request.setAttribute("page", result.getPage()); 
request.setAttribute("productlist", result.getContent()); 
} else if ("end".equals(state)) { 
page.setCurrentPage(Integer.parseInt(pageno)); 
Result result = pdp.productlist(page); 
request.setAttribute("page", result.getPage()); 
request.setAttribute("productlist", result.getContent()); 
} 
} else { 
page.setCurrentPage(Integer.parseInt(pagemark)); 
Result result = pdp.productlist(page); 
request.setAttribute("page", result.getPage()); 
request.setAttribute("productlist", result.getContent()); 
} 
return mapping.findForward("showProduct");