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...