分页例子

分页每个项目里面差不多都会用到
我以前耶找了很多个 但最近掌握了一个很好用的分页
先是一个page的bean：

Java代码
1.package com.leatherstore.other;   
2. 
3.public class Page {   
4. 
5./** 是否有上一页 */   
6.private boolean hasPrePage;   
7. 
8./** 是否有下一页 */   
9.private boolean hasNextPage;   
10. 
11./** 每页的数量 */   
12.private int everyPage;   
13. 
14./** 总页数 */   
15.private int totalPage;   
16. 
17./** 当前页*/   
18.private int currentPage;   
19. 
20./** 起始点 */   
21.private int beginIndex;   
22. 
23./** 总记录数*/   
24.private int totalCount;   
25. 
26./**  
27.* @return totalCount  
28.*/   
29.public int getTotalCount() {   
30.return totalCount;   
31.}   
32. 
33./**  
34.* @param totalCount 要设置的 totalCount  
35.*/   
36.public void setTotalCount(int totalCount) {   
37.this.totalCount = totalCount;   
38.}   
39. 
40./** The default constructor */   
41.public Page(){   
42. 
43.}   
44. 
45./** construct the page by everyPage  
46.* @param everyPage  
47.* */   
48.public Page(int everyPage){   
49.this.everyPage = everyPage;   
50.}   
51. 
52./** The whole constructor */   
53.public Page(boolean hasPrePage, boolean hasNextPage,   
54.int everyPage, int totalPage,   
55.int currentPage, int beginIndex,int totalCount) {   
56.this.hasPrePage = hasPrePage;   
57.this.hasNextPage = hasNextPage;   
58.this.everyPage = everyPage;   
59.this.totalPage = totalPage;   
60.this.currentPage = currentPage;   
61.this.beginIndex = beginIndex;   
62.this.totalCount = totalCount;   
63.}   
64. 
65./**  
66.* @return  
67.* Returns the beginIndex.  
68.*/   
69.public int getBeginIndex() {   
70.return beginIndex;   
71.}   
72. 
73./**  
74.* @param beginIndex  
75.* The beginIndex to set.  
76.*/   
77.public void setBeginIndex(int beginIndex) {   
78.this.beginIndex = beginIndex;   
79.}   
80. 
81./**  
82.* @return  
83.* Returns the currentPage.  
84.*/   
85.public int getCurrentPage() {   
86.return currentPage;   
87.}   
88. 
89./**  
90.* @param currentPage  
91.* The currentPage to set.  
92.*/   
93.public void setCurrentPage(int currentPage) {   
94.this.currentPage = currentPage;   
95.}   
96. 
97./**  
98.* @return  
99.* Returns the everyPage.  
100.*/   
101.public int getEveryPage() {   
102.return everyPage;   
103.}   
104. 
105./**  
106.* @param everyPage  
107.* The everyPage to set.  
108.*/   
109.public void setEveryPage(int everyPage) {   
110.this.everyPage = everyPage;   
111.}   
112. 
113./**  
114.* @return  
115.* Returns the hasNextPage.  
116.*/   
117.public boolean getHasNextPage() {   
118.return hasNextPage;   
119.}   
120. 
121./**  
122.* @param hasNextPage  
123.* The hasNextPage to set.  
124.*/   
125.public void setHasNextPage(boolean hasNextPage) {   
126.this.hasNextPage = hasNextPage;   
127.}   
128. 
129./**  
130.* @return  
131.* Returns the hasPrePage.  
132.*/   
133.public boolean getHasPrePage() {   
134.return hasPrePage;   
135.}   
136. 
137./**  
138.* @param hasPrePage  
139.* The hasPrePage to set.  
140.*/   
141.public void setHasPrePage(boolean hasPrePage) {   
142.this.hasPrePage = hasPrePage;   
143.}   
144. 
145./**  
146.* @return Returns the totalPage.  
147.*  
148.*/   
149.public int getTotalPage() {   
150.return totalPage;   
151.}   
152. 
153./**  
154.* @param totalPage  
155.* The totalPage to set.  
156.*/   
157.public void setTotalPage(int totalPage) {   
158.this.totalPage = totalPage;   
159.}   
160.}  
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：

Java代码
1.package com.leatherstore.other;   
2. 
3.public class PageUtil {   
4./**  
5.* Use the origin page to create a new page  
6.*  
7.* @param page  
8.* @param totalRecords  
9.* @return  
10.*/   
11.public static Page createPage(Page page, int totalRecords) {   
12.return createPage(page.getEveryPage(), page.getCurrentPage(),   
13.totalRecords);   
14.}   
15. 
16./**  
17.* the basic page utils not including exception handler  
18.*  
19.* @param everyPage  
20.* @param currentPage  
21.* @param totalRecords  
22.* @return page  
23.*/   
24.public static Page createPage(int everyPage, int currentPage,   
25.int totalRecords) {   
26.everyPage = getEveryPage(everyPage);   
27.currentPage = getCurrentPage(currentPage);   
28.int beginIndex = getBeginIndex(everyPage, currentPage);   
29.int totalPage = getTotalPage(everyPage, totalRecords);   
30.boolean hasNextPage = hasNextPage(currentPage, totalPage);   
31.boolean hasPrePage = hasPrePage(currentPage);   
32. 
33.return new Page(hasPrePage, hasNextPage, everyPage, totalPage,   
34.currentPage, beginIndex, totalRecords);   
35.}   
36. 
37.private static int getEveryPage(int everyPage) {   
38.return everyPage == 0 ? 10 : everyPage;   
39.}   
40. 
41.private static int getCurrentPage(int currentPage) {   
42.return currentPage == 0 ? 1 : currentPage;   
43.}   
44. 
45.private static int getBeginIndex(int everyPage, int currentPage) {   
46.return (currentPage - 1) * everyPage;   
47.}   
48. 
49.private static int getTotalPage(int everyPage, int totalRecords) {   
50.int totalPage = 0;   
51. 
52.if (totalRecords % everyPage == 0)   
53.totalPage = totalRecords / everyPage;   
54.else   
55.totalPage = totalRecords / everyPage + 1;   
56. 
57.return totalPage;   
58.}   
59. 
60.private static boolean hasPrePage(int currentPage) {   
61.return currentPage == 1 ? false : true;   
62.}   
63. 
64.private static boolean hasNextPage(int currentPage, int totalPage) {   
65.return currentPage == totalPage || totalPage == 0 ? false : true;   
66.}   
67. 
68.}  
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：

Java代码
1.package com.leatherstore.hibernate.domain;   
2. 
3.import java.util.List;   
4. 
5.import com.leatherstore.other.Page;   
6. 
7.public class Result {   
8.private Page page; //分页信息   
9.private List content; //每页显示的集合   
10./**  
11.* The default constructor  
12.*/   
13.public Result() {   
14.super();   
15.}   
16. 
17./**  
18.* The constructor using fields  
19.*  
20.* @param page  
21.* @param content  
22.*/   
23.public Result(Page page, List content) {   
24.this.page = page;   
25.this.content = content;   
26.}   
27. 
28./**  
29.* @return Returns the content.  
30.*/   
31.public List getContent() {   
32.return content;   
33.}   
34. 
35./**  
36.* @return Returns the page.  
37.*/   
38.public Page getPage() {   
39.return page;   
40.}   
41. 
42./**  
43.* @param content  
44.* The content to set.  
45.*/   
46.public void setContent(List content) {   
47.this.content = content;   
48.}   
49. 
50./**  
51.* @param page  
52.* The page to set.  
53.*/   
54.public void setPage(Page page) {   
55.this.page = page;   
56.}   
57.}  
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：

Java代码
1.ProductDAO：   
2.public List getProductByPage(Page page);   
3.public int getProductCount(); //返回数据的总数   
4.ProductDAO的接口实现ProductDAOImpl：   
5.//为了在spring里统一编程风格：我用的回调的方法   
6.public List getProductByPage(final Page page) {   
7.return this.getHibernateTemplate().executeFind(new HibernateCallback(){   
8.public Object doInHibernate(Session session) throws HibernateException, SQLException {   
9.Query query=session.createQuery("from Productinfo");   
10.query.setFirstResult(page.getBeginIndex()); //hibernate分页的精髓 呵呵   
11.query.setMaxResults(page.getEveryPage());   
12.return query.list();   
13.}   
14.});   
15.}   
16. 
17.public int getProductCount() {   
18.List list=this.getHibernateTemplate().find("select count(*) from Productinfo");   
19.return ((Integer)list.iterator().next()).intValue();   
20.}  
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：

Java代码
1.IProduct：   
2.public Result listProduct(Page page);  
IProduct：
public Result listProduct(Page page); 然后IProduct接口的实现：IProductImpl：

Java代码
1.private ProductDAO productDAO;   
2.public void setProductDAO(ProductDAO productDAO){   
3.this.productDAO=productDAO;   
4.}   
5. 
6.public Result listProduct(Page page) {   
7.int totalRecords = this.productDAO.getProductCount();   
8.page = PageUtil.createPage(page, totalRecords);   
9.List products = this.productDAO.getProductByPage(page);   
10.return new Result(page, products);   
11.}  
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：

Java代码
1.ProductProxy：   
2.IProduct pro=(IProduct)AppContext.getInstance().getappcontext().getBean("productServicewithTran");   
3. 
4.public Result productlist(Page page){   
5.try{   
6.return pro.listProduct(page);   
7.}catch(DataAccessException ex){   
8.ex.printStackTrace();   
9.return null;   
10.}   
11.}  
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

Java代码
1.Page page = new Page(); //实例化一个page对象   
2.page.setEveryPage(10); //设置每页显示的条数   
3.page.setCurrentPage(1); //为第一页   
4.Result result = pdp.productlist(page);   
5.request.setAttribute("page", pageinfo);   
6.request.setAttribute("productlist", list);   
7.return mapping.findForward("showProduct");  
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

Html代码
1.<logic:iterate id="product" name="productlist">   
2.//中间迭代所要显示的数据   
3.</logic:iterate>   
4.<tr>   
5.<td width="80" height="30"> </td>   
6.<logic:equal value="true" name="page" property="hasPrePage">   
7.<td width="150" height="30"><div align="right"><a href="../product.do?method=showProductByTag&index=first&msg=${msg }">首页</a></div></td>   
8.<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=prew&pageno=${page.currentPage -1}&msg=${msg }">上一页</a></div></td>   
9.</logic:equal>   
10.<logic:notEqual value="true" name="page" property="hasPrePage">   
11.<td width="150" height="30"><div align="right">首页</div></td>   
12.<td width="80" height="30"><div align="center">上一页</div></td>   
13.</logic:notEqual>   
14.<logic:equal value="true" name="page" property="hasNextPage">   
15.<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=next&pageno=${page.currentPage +1 }&msg=${msg }">下一页</a></div></td>   
16.<td width="80" height="30"><div align="center"><a href="../product.do?method=showProductByTag&index=end&pageno=${page.totalPage }&msg=${msg }">尾页</a></div></td>   
17.</logic:equal>   
18.<logic:notEqual value="true" name="page" property="hasNextPage">   
19.<td width="80" height="30"><div align="center">下一页</div></td>   
20.<td width="80" height="30"><div align="center">尾页</div></td>   
21.</logic:notEqual>   
22.<td height="30" colspan="3"><div align="center">页次${page.currentPage }/${page.totalPage }   共${page.totalCount }条记录</div> <div align="center"></div></td>   
23.</tr>  
<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：

Java代码
1.Page page = new Page();   
2.page.setEveryPage(10);   
3.String pagemark = request.getParameter("goto");   
4.if (pagemark == null) {   
5.String state = request.getParameter("index");   
6.String pageno = request.getParameter("pageno");   
7.System.out.println("pageno=" + pageno);   
8.if ("first".equals(state)) {   
9.page.setCurrentPage(1);   
10.Result result = pdp.productlist(page);   
11.request.setAttribute("page", result.getPage());   
12.request.setAttribute("productlist", result.getContent());   
13.} else if ("prew".equals(state)) {   
14.page.setCurrentPage(Integer.parseInt(pageno));   
15.Result result = pdp.productlist(page);   
16.request.setAttribute("page", result.getPage());   
17.request.setAttribute("productlist", result.getContent());   
18.} else if ("next".equals(state)) {   
19.page.setCurrentPage(Integer.parseInt(pageno));   
20.Result result = pdp.productlist(page);   
21.request.setAttribute("page", result.getPage());   
22.request.setAttribute("productlist", result.getContent());   
23.} else if ("end".equals(state)) {   
24.page.setCurrentPage(Integer.parseInt(pageno));   
25.Result result = pdp.productlist(page);   
26.request.setAttribute("page", result.getPage());   
27.request.setAttribute("productlist", result.getContent());   
28.}   
29.} else {   
30.page.setCurrentPage(Integer.parseInt(pagemark));   
31.Result result = pdp.productlist(page);   
32.request.setAttribute("page", result.getPage());   
33.request.setAttribute("productlist", result.getContent());   
34.}   
35.return mapping.findForward("showProduct");