ssh分頁實例

 

ssh分頁實例

先是一個page的bean：

package com.leatherstore.other;

public class Page {

/** 是否有上一頁 */
private boolean hasPrePage;

/** 是否有下一頁 */
private boolean hasNextPage;

/** 每頁的數量 */
private int everyPage;

/** 總頁數 */
private int totalPage;

/** 當前頁*/
private int currentPage;

/** 起始點 */
private int beginIndex;

/** 總記錄數*/
private int totalCount;

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

/**
* @param totalCount 要設置的 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;
}
}

package com.leatherstore.other; 

public class Page { 

/** 是否有上一頁 */ 
private boolean hasPrePage; 

/** 是否有下一頁 */ 
private boolean hasNextPage; 

/** 每頁的數量 */ 
private int everyPage; 

/** 總頁數 */ 
private int totalPage; 

/** 當前頁*/ 
private int currentPage; 

/** 起始點 */ 
private int beginIndex; 

/** 總記錄數*/ 
private int totalCount; 

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

/** 
* @param totalCount 要設置的 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; 
} 
} 

然後構建一個page的工廠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;
}

}

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; 
} 

} 

然後建一個專用的bean：

package com.leatherstore.hibernate.domain;

import java.util.List;

import com.leatherstore.other.Page;

public class Result {
private Page page; //分頁信息
private List content; //每頁顯示的集合
/**
* 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;
}
}

package com.leatherstore.hibernate.domain; 

import java.util.List; 

import com.leatherstore.other.Page; 

public class Result { 
private Page page; //分頁信息 
private List content; //每頁顯示的集合 
/** 
* 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; 
} 
} 

然後在數據訪問層寫兩個方法：

ProductDAO：
public List getProductByPage(Page page);
public int getProductCount(); //返回數據的總數
ProductDAO的接口實現ProductDAOImpl：
//爲了在spring裏統一編程風格：我用的回調的方法
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分頁的精髓 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();
}

ProductDAO： 
public List getProductByPage(Page page); 
public int getProductCount(); //返回數據的總數 
ProductDAO的接口實現ProductDAOImpl： 
//爲了在spring裏統一編程風格：我用的回調的方法 
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分頁的精髓 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(); 
} 

然後是業務層：

IProduct：
public Result listProduct(Page page);

IProduct： 
public Result listProduct(Page page); 

然後IProduct接口的實現：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);
}

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); 
} 

然後再代理層：

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;
}
}

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 終於到productAction啦
顯示前方法的代碼

Page page = new Page(); //實例化一個page對象
page.setEveryPage(10); //設置每頁顯示的條數
page.setCurrentPage(1); //爲第一頁
Result result = pdp.productlist(page);
request.setAttribute("page", pageinfo);
request.setAttribute("productlist", list);
return mapping.findForward("showProduct");

Page page = new Page(); //實例化一個page對象 
page.setEveryPage(10); //設置每頁顯示的條數 
page.setCurrentPage(1); //爲第一頁 
Result result = pdp.productlist(page); 
request.setAttribute("page", pageinfo); 
request.setAttribute("productlist", list); 
return mapping.findForward("showProduct"); 

接着就是jsp頁面了

<logic:iterate id="product" name="productlist">
//中間迭代所要顯示的數據
</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=${msg }">首頁</a></div></td>
<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=prew&pageno=${page.currentPage -1}&msg=${msg }">上一頁</a></div></td>
</logic:equal>
<logic:notEqual value="true" name="page" property="hasPrePage">
<td width="150" height="30"><div align="right">首頁</div></td>
<td width="80" height="30"><div align="center">上一頁</div></td>
</logic:notEqual>
<logic:equal value="true" name="page" property="hasNextPage">
<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=next&pageno=${page.currentPage +1 }&msg=${msg }">下一頁</a></div></td>
<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=end&pageno=${page.totalPage }&msg=${msg }">尾頁</a></div></td>
</logic:equal>
<logic:notEqual value="true" name="page" property="hasNextPage">
<td width="80" height="30"><div align="center">下一頁</div></td>
<td width="80" height="30"><div align="center">尾頁</div></td>
</logic:notEqual>
<td height="30" colspan="3"><div align="center">頁次${page.currentPage }/${page.totalPage }   共${page.totalCount }條記錄</div> <div align="center"></div></td>
</tr>

<logic:iterate id="product" name="productlist"> 
//中間迭代所要顯示的數據 
</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=${msg }">首頁</a></div></td> 
<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=prew&pageno=${page.currentPage -1}&msg=${msg }">上一頁</a></div></td> 
</logic:equal> 
<logic:notEqual value="true" name="page" property="hasPrePage"> 
<td width="150" height="30"><div align="right">首頁</div></td> 
<td width="80" height="30"><div align="center">上一頁</div></td> 
</logic:notEqual> 
<logic:equal value="true" name="page" property="hasNextPage"> 
<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=next&pageno=${page.currentPage +1 }&msg=${msg }">下一頁</a></div></td> 
<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=end&pageno=${page.totalPage }&msg=${msg }">尾頁</a></div></td> 
</logic:equal> 
<logic:notEqual value="true" name="page" property="hasNextPage"> 
<td width="80" height="30"><div align="center">下一頁</div></td> 
<td width="80" height="30"><div align="center">尾頁</div></td> 
</logic:notEqual> 
<td height="30" colspan="3"><div align="center">頁次${page.currentPage }/${page.totalPage }   共${page.totalCount }條記錄</div> <div align="center"></div></td> 
</tr> 

可以顯示相應的頁面信息
然後productAction裏面的showProductByTag代碼如下：

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");