List 分页封装及结合Struts2使用

1. 核心类:

import java.util.ArrayList;
import java.util.List;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.nazca.consult.consultee.web.util.Pager;
import com.opensymphony.xwork2.ActionSupport;

/**
 * 分页使用到的Action，如果其他有分页需要的action继承此Action即可使用分页功能
 * 
 * @author XiaoQuan
 */
public class AbstractListActioin extends ActionSupport {

    private static final long serialVersionUID = -4680224737445304053L;
    private static Log log = LogFactory.getLog(AbstractListActioin.class);

    public Pager makePager(String pageNumber, int total, int pageSize,
            int ListStep) {
        Pager pager = new Pager();
        // 设置总数
        pager.setTotal(total);
        // 设置每页显示多少数据
        pager.setPageSize(pageSize);

        int pageNum = 1;

        if (pageNumber != null) {
            pageNum = Integer.parseInt(pageNumber);
        }

        // 设置当前页
        pager.setCurrentPage(pageNum);

        // 最多显示分页页数
        pager.setListStep(ListStep);

        // 求总页数，ceil（num）取整不小于num
        pager.setPagesCount((int) Math.ceil((double) pager.getTotal()
            / pager.getPageSize()));
        if (pager.getPagesCount() < pageNum) {
            pager.setCurrentPage(pager.getPagesCount());// 如果分页变量大总页数，则将分页变量设计为总页数
        }
        if (pageNum < 1) {
            pager.setCurrentPage(1);
        }

        // 从第几页开始显示分页信息
        pager.setListBegin(pager.getCurrentPage() - (int) Math.ceil((double) pager.getListStep() / 2));
        if (pager.getListBegin() < 1) {
            pager.setListBegin(1);
        }

        // 分页信息显示到第几页
        pager.setListEnd(pager.getCurrentPage() + pager.getListStep() / 2);

        if (pager.getListEnd() > pager.getPagesCount()) {
            pager.setListEnd(pager.getPagesCount());
        }

        List<String> list = new ArrayList<String>();
        
        for (int i = pager.getListBegin(); i < pager.getListEnd(); i++) {
            list.add(i + "");
        }

        pager.setPageList(list);
        return pager;
    }
}

Pager类:

import java.util.List;

/**
 *
 * @author XiaoQuan
 */
@SuppressWarnings("unchecked")
public class Pager {

    private int beginPage;
    private int endPage;
    private int currentPage;
    private int pageSize;
    private int total;
    private int listStep;
    private int listBegin;
    private int listEnd;
    private int pagesCount;
    private List pageList;

    public int getBeginPage() {
        return beginPage;
    }

    public void setBeginPage(int beginPage) {
        this.beginPage = beginPage;
    }

    public int getEndPage() {
        return endPage;
    }

    public void setEndPage(int endPage) {
        this.endPage = endPage;
    }

    public int getCurrentPage() {
        return currentPage;
    }

    public void setCurrentPage(int currentPage) {
        this.currentPage = currentPage;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public int getTotal() {
        return total;
    }

    public void setTotal(int total) {
        this.total = total;
    }

    public int getListStep() {
        return listStep;
    }

    public void setListStep(int listStep) {
        this.listStep = listStep;
    }

    public int getListBegin() {
        return listBegin;
    }

    public void setListBegin(int listBegin) {
        this.listBegin = listBegin;
    }

    public int getListEnd() {
        return listEnd;
    }

    public void setListEnd(int listEnd) {
        this.listEnd = listEnd;
    }

    public int getPagesCount() {
        return pagesCount;
    }

    public void setPagesCount(int pagesCount) {
        this.pagesCount = pagesCount;
    }

    public List getPageList() {
        return pageList;
    }

    public void setPageList(List pageList) {
        this.pageList = pageList;
    }
}

2. 需要使用分页的Action类继承该类

public class GetMyQListAction extends AbstractListActioin {

中间内容略....
//获得page对象，保存到session中
Pager pageP = makePager(getPage(), total,
                Constants.MY_QUESTION_PAGE_N, Constants.LIST_STEP);
            ctx.put("pager", pageP);
}

3.页面添加如下JSP内容即可

<div id="pageNavigator">
	<span> <s:if test="#request.pager.currentPage > 1">
			<s:url id="prePage" action="consult" includeParams="none">
				<s:param name="pages" value="#request.pager.currentPage-1" />
			</s:url>
			<s:a href="#"
				onclick="javascript:GetFavoriteQList(0,%{#request.pager.currentPage-1})">上一页</s:a>
		</s:if> <s:else>
			<span>上一页</span>
		</s:else> </span>
	<span> <s:iterator value="#request.pager.pageList" id="pageList"
			status="pageNum">
			<s:if test="#request.pager.currentPage == #pageList">
				<b>[<s:property value="pageList" />]</b>
			</s:if>
			<s:else>
				<s:a href="#"
					onclick="javascript:GetFavoriteQList(0,%{pageList})">[<s:property
						value="pageList" />]</s:a>
			</s:else>
		</s:iterator> </span>
	<span> <s:if
			test="#request.pager.currentPage != #request.pager.pagesCount">
			<s:url id="nextPage" action="some" includeParams="none">
				<s:param name="pages" value="#request.pager.currentPage+1" />
			</s:url>
			<s:a href="#"
				onclick="javascript:GetFavoriteQList(0,%{#request.pager.currentPage+1})">下一页</s:a>
		</s:if> <s:else>
			<span>下一页</span>
		</s:else> </span>
</div>

能不能详细点阿？兄弟。javascript在哪？数据怎么取

function GetList(q, p){
    var url = null;
    switch (q) {
        case 1:
            url = "A.action?page=" + p;
            break;
        default:
            url = "B.action?page=" + p;
    }
    window.scrollTo(0, 0);
    new Ajax.Request(url, {
        method: 'post',
        onSuccess: function(transport){
            var favoriteQList = transport.responseText;
            $("favoriteQ").innerHTML = favoriteQList;
        },
        onCreate: function(){
            $("favoriteQ").innerHTML = $("loadingDiv").innerHTML;
        },
        onFailure: function(){
            $('loadingText').innerHTML = "出错啦";
            $("favoriteQ").innerHTML = $("loadingDiv").innerHTML;
        }
    });
}

q是列表的类型，p 是返回要获取的页数

能不能提供demo的源代码呢？这样看着很累，自己想实验一下

直接打包上传下吧

private List pageList;   --- 这个是虾米东东?

嗯 ,楼上的见解和我一样,我正在做这个标签,原则上 page类只是一个控制类,指示index和size,action里不宜放太多的业务逻辑啊

看看rubbin先生的，业务类写的很好了

真麻烦 还不如
http://www.iteye.com/topic/317875