Web分页工具类

　JavaEE的企业应用都少不了分页，有个通用的分页工具类就比较方便了。

　　一般分页类应该包含记录集合、当前页、每页显示记录数、总记录数、总页数等属性，扩展一下，还可以有判断是否有上一页、是否有下一页等属性。

1、分页工具类

package cn.luxh.app.util;import java.io.Serializable;import java.util.List;/** * The <code>Pagination</code> class 分页 *  * @author Luxh * @version 1.0   */public class Pagination<T>  implements Serializable{        private static final long serialVersionUID = 5104811017362151385L;    /**当前页*/    private int currentPage;        /**每页显示记录数*/    private int pageSize;        /**总记录数*/    private long recordCount = 1L;        /**记录集合*/    private List<T> recordList;        /**总页数*/    private int pageCount;        /**偏移数*/    private int offset;        /**上一页*/    private int prePage;        /**下一页*/    private int nextPage;        /**是否有上一页*/    private boolean hasPrePage;        /**是否有下一页*/    private boolean hasNextPage;            /**     * 默认的空参构造数     *     */    public Pagination() {            }        /**     * 构造函数,计算总页数、是否有上一页、下一页等.     * @param currentPage    当前页     * @param pageSize        每页显示记录数     * @param recordCount   总记录数     * @param recordList    记录集合     */    public  Pagination(int currentPage,int pageSize,long recordCount,List<T> recordList) {        this.currentPage = currentPage;        if(currentPage < 1) {            this.currentPage = 1;        }                this.pageSize = pageSize;        this.recordCount = recordCount;        this.recordList = recordList;                //上一页等于当前页减一        this.prePage = this.currentPage - 1;        if(this.prePage < 1) {            this.hasPrePage = false;//没有上一页            this.prePage = 1;        }else {            this.hasPrePage = true;//有上一页        }                //计算总页数        this.pageCount = (int)Math.ceil(recordCount / (double)pageSize);        if(this.currentPage > this.pageCount) {            this.currentPage = this.pageCount;        }                //下一页等于当前页加一        this.nextPage = this.currentPage + 1;        if(this.nextPage > this.pageCount) {            this.hasNextPage = false;//没有下一页            this.nextPage = this.pageCount;        }else {            this.hasNextPage = true;//有下一页        }                //偏移量        this.offset = (this.currentPage - 1)*pageSize;    }    public int getCurrentPage() {        return currentPage;    }    public void setCurrentPage(int currentPage) {        this.currentPage = currentPage;    }    public boolean isHasNextPage() {        return hasNextPage;    }    public void setHasNextPage(boolean hasNextPage) {        this.hasNextPage = hasNextPage;    }    public boolean isHasPrePage() {        return hasPrePage;    }    public void setHasPrePage(boolean hasPrePage) {        this.hasPrePage = hasPrePage;    }    public int getNextPage() {        return nextPage;    }    public void setNextPage(int nextPage) {        this.nextPage = nextPage;    }    public int getOffset() {        return offset;    }    public void setOffset(int offset) {        this.offset = offset;    }    public int getPageCount() {        return pageCount;    }    public void setPageCount(int pageCount) {        this.pageCount = pageCount;    }    public int getPageSize() {        return pageSize;    }    public void setPageSize(int pageSize) {        this.pageSize = pageSize;    }    public int getPrePage() {        return prePage;    }    public void setPrePage(int prePage) {        this.prePage = prePage;    }        public long getRecordCount() {        return recordCount;    }    public void setRecordCount(long recordCount) {        this.recordCount = recordCount;    }    public List<T> getRecordList() {        return recordList;    }    public void setRecordList(List<T> recordList) {        this.recordList = recordList;    }        }

2、在JSP页面上的展现

　　1）表单展现数据

<form id="ListForm" method="post">    <%--迭代展现分页数据--%>            <table>        <tr>            <th>姓名</th>            <th>账号</th>        </tr>        <c:forEach items="${pagination.recordList}" var="user">            <tr>                    <td>${user.name}</td>                    <td>${user.account}</td>            </tr>        </c:forEach>    </table>    <br>    <%--控制分页--%>    <table>        <tr>            <td align="right">                页数：<font color="blue">${pagination.currentPage}/${pagination.pageCount}</font>                <input type="button"  onclick="paginationQuery('First')" value="首页">                 <input type="button"  onclick="paginationQuery('Previous')" <c:if test="${!pagination.hasPrePage}">disabled="disabled"</c:if> value="上一页">                 <input type="button"  onclick="paginationQuery('Next')"<c:if test="${!pagination.hasNextPage}">disabled="disabled"</c:if> value="下一页">                 <input type="button"  onclick="paginationQuery('Last')"value="尾页">             </td>        </tr>    </table>        <%--当前页--%>    <input type="hidden" id="currentPage" name="currentPage" value="${pagination.currentPage}">    <%--总页数--%>    <input type="hidden" id="totalPageCount" value="${pagination.pageCount}"></form>

2）Javascript控制分页

//分页查询脚本function paginationQuery(flag) {    var value = parseInt($("#currentPage").val());    if(flag=="First") {        $("#currentPage").val(1);//首页    }else if(flag=="Previous") {        $("#currentPage").val(value-1);//上一页    }else if(flag=="Next") {        $("#currentPage").val(value+1);//下一页    }else if(flag=="Last") {        $("#currentPage").val($("#totalPageCount").val());//尾页    }    $("#ListForm").attr("action","user/userList.action").submit();}