struts开发实践-分页的实现

本案主要功能是完成数据集的分页显示。示例代码如下：


1.PageInfo类：定义分页信息。

/******************program begin**************************/

package test;

import java.io.*;

public final class PaginationInfo

implements Serializable {

/**页大小描述每页有多少行*/

private int pageSize = 20;

/**是否有上一页*/

private boolean hasPrevious;

/**是否有下一页*/

private boolean hasNext;

/**总行数 */

private int total;

/**总页数 */

private int totalPage;

/**当前页码*/

private int currentPageNumber=1;

/**跳转动作：1:首页；2：前一页；3：后一页；4：末页*/

private int jumpState;

public void setPageSize(int pageSize) {

this.pageSize = pageSize;

}

public int getPageSize() {

return pageSize;

}

public void setHasPrevious(boolean hasPrevious) {

this.hasPrevious = hasPrevious;

}

public boolean getHasPrevious() {

return hasPrevious;

}

public void setPreviousPageNumber(int previousPageNumber) {

this.previousPageNumber = previousPageNumber;

}

public int getPreviousPageNumber() {

return previousPageNumber;

}

public void setHasNext(boolean hasNext) {

this.hasNext = hasNext;

}

public boolean getHasNext() {

return hasNext;

}

public void setNextPageNumber(int nextPageNumber) {

this.nextPageNumber = nextPageNumber;

}

public int getNextPageNumber() {

return nextPageNumber;

}

public void setTotal(int total) {

this.total = total;

}

public int getTotal() {

return total;

}

public void setTotalPage(int totalPage) {

this.totalPage=totalPage;

}

public int getTotalPage() {

return totalPage;

}

public void setCurrentPageNumber(int currentPageNumber) {

this.currentPageNumber=currentPageNumber;

}

public int getCurrentPageNumber() {

return currentPageNumber;

}

public void setJumpState(int jumpState){

this.jumpState=jumpState;

}

public int getJumpState(){

return jumpState;

}

}

2.分页逻辑方法代码节选：

public void setPageInfo(PaginationInfo paginationInfo) {

//跳转页

if (paginationInfo.getJumpState() == 1) { //首页

paginationInfo.setCurrentPageNumber(1);

}

if (paginationInfo.getJumpState() == 2) {

paginationInfo.setCurrentPageNumber(paginationInfo.getCurrentPageNumber() -

1);

}

if (paginationInfo.getJumpState() == 3) {

paginationInfo.setCurrentPageNumber(paginationInfo.getCurrentPageNumber() +

1);

}

if (paginationInfo.getJumpState() == 4) {

paginationInfo.setCurrentPageNumber(paginationInfo.getTotalPage());

}

int totalPage = total / paginationInfo.getPageSize();

if (total % paginationInfo.getPageSize() > 0) {

paginationInfo.setTotalPage(totalPage + 1);

}

else {

paginationInfo.setTotalPage(totalPage);

}

if (paginationInfo.getCurrentPageNumber() <= 1) {

paginationInfo.setCurrentPageNumber(1);

paginationInfo.setHasPrevious(false);

paginationInfo.setHasNext(true);

}

else if (paginationInfo.getCurrentPageNumber() >=

paginationInfo.getTotalPage()) {

paginationInfo.setCurrentPageNumber(paginationInfo.getTotalPage());

paginationInfo.setHasNext(false);

paginationInfo.setHasPrevious(true);

}

else {

paginationInfo.setHasPrevious(true);

paginationInfo.setHasNext(true);

}

}

3.jsp页面的分页显示代码节选：

<logic:equal name="testForm" property="paginationInfo.currentPageNumber" value="1">

<td align="right" width="30" height="22"><img src="images/pages/distop.gif" alt="首页" border="0"></td>

<td align="right" width="30" height="22"><img src="images/pages/disprevious.gif" alt="上一页" border="0" ></td>

</logic:equal>

<logic:greaterThan name="testForm" property="paginationInfo.currentPageNumber" value="1">

<td align="right" width="30" height="22"><a href="javascript:gotoPage(1)"><img src="images/pages/top.gif" alt="首页" border="0" ></a></td>

<td align="right" width="30" height="22"><a href="javascript:gotoPage(2)"><img src="images/pages/previous.gif" alt="上一页" border="0"></a></td>

</logic:greaterThan>

<logic:equal name="testForm" property="paginationInfo.hasNext" value="false">

<td align="right" width="30" height="22"><img src="images/pages/disnext.gif" alt="下一页" border="0" ></td>

<td align="right" width="30" height="22"><img src="images/pages/disbottom.gif" alt="末页" border="0" ></td>

</logic:equal>

<logic:equal name="testForm" property="paginationInfo.hasNext" value="true">

<td align="right" width="30" height="22"><a href="javascript:gotoPage(3)"><img src="images/pages/next.gif" alt="下一页" border="0" ></a></td>

<td align="right" width="30" height="22"><a href="javascript:gotoPage(4)"><img src="images/pages/bottom.gif" alt="末页" border="0"></a></td>

</logic:equal>

<html:hidden name="testForm" property="paginationInfo.jumpState">

...//省略

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