封装分页控件

1.定义封装类。

import java.util.List;

/**

 * 用户封装分页查询数据的类

 * 通过构造方法来初始化一个分页信息对象供JSP页面使用

 * @author gjf

 *

 */

@SuppressWarnings("serial")

public class PageInfo extends BaseObject {

    private int pageIndex; // 当前第几页数据

    private int pageSize;     //每页要显示的最大记录个数    

    private int recordeCount; // 满足查询条件的总记录数

    private int pageCount; // 满足条件的总页数

    @SuppressWarnings("rawtypes")

    private List pageData; // 当前查询的分页数据

    private boolean hasPreviousPage;  //是否有上一页



    private boolean hasNextPage; //是否有下一页



    /**

     * 唯一可用的初始化分页信息的构造方法

     * @param pageData    分页后的查询数据

     * @param recordeCount    //满足查询条件的总记录数

     * @param pageIndex    当前查询的是第几页的数据

     * @param pageSize    每页要显示的最大记录个数

     */

    @SuppressWarnings("rawtypes")

    public PageInfo(List pageData, int recordeCount, int pageIndex, int pageSize) {

        this.pageData = pageData;

        this.recordeCount = recordeCount;

        this.pageIndex = pageIndex;

        this.pageSize = pageSize;

        

        //计算总页数

        pageCount = (recordeCount + pageSize - 1) / pageSize;

        

        //对于最后一页，计算实际的记录个数，因此最后一页的记录个数不一定等于设定的最大记录个数

        if(pageIndex == pageCount) {

            this.pageSize = recordeCount - ((pageCount - 1) * pageSize);

        }

        this.setHasNextPage(this.isNextPageEnable());

        this.setHasPreviousPage(this.isPreviousPageEnable());

    }



    public int getPageIndex() {

        return pageIndex;

    }



    public int getPageSize() {

        return pageSize;

    }



    public int getRecordeCount() {

        return recordeCount;

    }



    public int getPageCount() {

        return pageCount;

    }



    @SuppressWarnings("rawtypes")

    public List getPageData() {

        return pageData;

    }



    public boolean isNextPageEnable() {

        return this.setHasNextPage(pageIndex < pageCount);

    }



    public boolean isPreviousPageEnable() {

        return this.setHasPreviousPage(pageIndex > 1);

    }



    public boolean setHasPreviousPage(boolean hasPreviousPage) {

        this.hasPreviousPage = hasPreviousPage;

        return hasPreviousPage;

    }



    public boolean isHasPreviousPage() {

        return hasPreviousPage;

    }



    public boolean setHasNextPage(boolean hasNextPage) {

        this.hasNextPage = hasNextPage;

        return hasNextPage;

    }



    public boolean isHasNextPage() {

        return hasNextPage;

    }



    

}

上面的父类BaseObject 定义如下

import java.io.Serializable;



import org.apache.commons.lang.builder.EqualsBuilder;

import org.apache.commons.lang.builder.HashCodeBuilder;

import org.apache.commons.lang.builder.ToStringBuilder;

import org.apache.commons.lang.builder.ToStringStyle;



/**

 * 基础ENTITY类

 * 只实现equal()、hashCoce()、toString()方法

 * @author gjf

 *

 */

public abstract class BaseObject implements Serializable{

    private static final long serialVersionUID = -1L;

    

    public boolean equals(Object obj) {

        return EqualsBuilder.reflectionEquals(this, obj);

    }



    public int hashCode() {

        return HashCodeBuilder.reflectionHashCode(this);

    }



    public String toString() {

        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);

    }

}

 

2.定义一个后台取数据的方法以及计算总数的方法

public interface IXxxService {



public List<Xxx> getXxxs(int id,int startIndex,int endIndex);

public int countXxx();
}

3.在需要的地方使用

List<Xxx> list=_ixxxService.getXxx(id,(pageIndex - 1) *pageSize,pageSize);//_ixxxServic 实现类对象

pageInfo=new PageInfo(list, rowCount, pageIndex, pageSize);

4.前端显示

    　　　　　　<s:iterator value="pageInfo.pageData" var="item" status="sta">//struts2标签

                        <table width="100%" border="0" cellspacing="0" cellpadding="0"

                            class="dd_main">

                            <tr>

                                <td width="12%" align="center">${item.属性}</td>

                            </tr>

                        </table>

                    </s:iterator>



                    <p:page url="your url"

                        pageInfo="${pageInfo }" />

5.CSS样式。。TO BE CONTINUE...