可見使用Hibernate，在進行查詢分頁的操作上，是具有非常大的靈活性，Hibernate會首先嘗試用特定資料庫的分頁sql，如果沒用，再嘗試Scrollable，如果不行，最後採用rset.next()移動的辦法。
（一）pager類
* @(#)Pager.java 2005-5-3
*
* Copyright (c) 2005, Jeffrey Hsu
*/
package com.jeffrey.messagelove;
/**
* Pager holds the page info.
*/
public class Pager {
private int totalRows = 0; // 記錄總數
private int totalPages = 0; // 總頁數
private int pageSize = 10; // 每頁顯示資料條數，預設為10條記錄
private int currentPage = 1; // 當前頁數
private boolean hasPrevious = false; // 是否有上一頁
private boolean hasNext = false; // 是否有下一頁
public Pager() {
}
/**
* Initialize Pager
* @param totalRows total record rows
* @param pageSize total record is hold by every page
*/
public void init(int totalRows, int pageSize) {
this.totalRows = totalRows;
this.pageSize = pageSize;
totalPages = ((totalRows + pageSize) - 1) / pageSize;
refresh(); // 重新整理當前頁面資訊
}
/**
* @return Returns the currentPage.
*/
public int getCurrentPage() {
return currentPage;
}
/**
* @param currentPage current page
*/
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
refresh();
}
/**
* @return Returns the pageSize.
*/
public int getPageSize() {
return pageSize;
}
/**
* @param pageSize The pageSize to set.
*/
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
refresh();
}
/**
* @return Returns the totalPages.
*/
public int getTotalPages() {
return totalPages;
}
/**
* @param totalPages The totalPages to set.
*/
public void setTotalPages(int totalPages) {
this.totalPages = totalPages;
refresh();
}
/**
* @return Returns the totalRows.
*/
public int getTotalRows() {
return totalRows;
}
/**
* @param totalRows The totalRows to set.
*/
public void setTotalRows(int totalRows) {
this.totalRows = totalRows;
refresh();
}
// 跳到第一頁
public void first() {
currentPage = 1;
this.setHasPrevious(false);
refresh();
}
// 取得上一頁（重新設定當前頁面即可）
public void previous() {
currentPage--;
refresh();
}
// 取得下一頁
public void next() {
System.out.println("next: totalPages: " + totalPages +
" currentPage : " + currentPage);
if (currentPage < totalPages) {
currentPage++;
}
refresh();
}
// 跳到最後一頁
public void last() {
currentPage = totalPages;
this.setHasNext(false);
refresh();
}
public boolean isHasNext() {
return hasNext;
}
/**
* @param hasNext The hasNext to set.
*/
public void setHasNext(boolean hasNext) {
this.hasNext = hasNext;
}
public boolean isHasPrevious() {
return hasPrevious;
}
/**
* @param hasPrevious The hasPrevious to set.
*/
public void setHasPrevious(boolean hasPrevious) {
this.hasPrevious = hasPrevious;
}
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