import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
/**
* 儲(chǔ)存分頁(yè)處理工具類 在調(diào)用此類的方法之前需設(shè)置總頁(yè)數(shù)(即得先從數(shù)據(jù)庫(kù)查詢到相應(yīng)數(shù)據(jù)的數(shù)據(jù)量)
*
* @author ahomeeye
* @version 1.0
*/
public class Pagination implements Serializable {
private static final long serialVersionUID = 1L;
public final static String FIRST_ACTION = "First"; // 執(zhí)行跳到第一頁(yè)操作
public final static String NEXT_ACTION = "Next"; // 執(zhí)行跳到下一頁(yè)操作
韓國(guó)女裝 public final static String PREVIO_ACTION = "Prev"; // 執(zhí)行跳到上一頁(yè)操作
public final static String LAST_ACTION = "Last"; // 執(zhí)行跳到最一頁(yè)操作
public final static String CURRENT_TAG = "currentPage"; // 當(dāng)前頁(yè)數(shù)
public final static String PAGINATION_ACTION_TAG = "paginationAction"; // 緩存操作
public final static String GOTO_PAGE_ACTION = "gotoPage"; // 執(zhí)行跳到指定的某一頁(yè)操作
public final static String PAGES_GOTO = "pageSelect"; // 執(zhí)行g(shù)oto操作時(shí),用戶所指定的頁(yè)數(shù)
private int start; // start表示當(dāng)前頁(yè)開(kāi)始的記錄數(shù),start=每頁(yè)行數(shù)*(當(dāng)前頁(yè)數(shù)-1)
private int end; // 當(dāng)前頁(yè)結(jié)束的記錄行數(shù)
private int totalCount; // 總行數(shù)
private int rowsPerPage = 15; // 每頁(yè)行數(shù)，默認(rèn)15
private int currentPage; // 當(dāng)前頁(yè)數(shù)
private int pageListSize = 9;// 頁(yè)碼列表大小，默認(rèn)9
private List<Integer> pageNumList = new ArrayList<Integer>();
public Pagination() {
start = 0;
end = 0;
currentPage = 1;
this.totalCount = 0;
}
public Pagination(int totalCount) {
start = 0;
end = 0;
currentPage = 1;
this.totalCount = totalCount;
}
public Pagination(int totalCount, int numPerPage) {
start = 0;
end = 0;
this.totalCount = totalCount;
currentPage = 1;
if (numPerPage > 0) {
rowsPerPage = numPerPage;
}
}
/**
* 執(zhí)行翻頁(yè)動(dòng)作
*
* @param currentPage
* 要翻到的目標(biāo)頁(yè)碼
* @return 返回翻頁(yè)對(duì)象
*/
public Pagination doPagination(int currentPage) {
gotoPage(currentPage);
return this;
}
// 設(shè)置起始數(shù)
public int getStart() {
start = rowsPerPage * (currentPage - 1);
return start;
}
// 得到起始數(shù)
public void setStart(int start) {
if (start < 0) {
this.start = 0;
} else if (start >= this.totalCount) {
this.start = this.totalCount - 1;
} else {
this.start = start;
}
}
// 設(shè)置當(dāng)前頁(yè)的最后一行的在總記錄中的順序(從0開(kāi)始)
public void setEnd(int end) {
this.end = end;
}
// 得到當(dāng)前頁(yè)的最后一行的在總記錄中的順序(從0開(kāi)始)
public int getEnd() {
if (rowsPerPage * currentPage > this.totalCount) {
end = this.totalCount - 1;
} else {
end = rowsPerPage * currentPage - 1;
}
return end;
}
// 以下4個(gè)方法供控制器(struts)調(diào)用
// 判斷能否到第一頁(yè);只要能到上一頁(yè)，肯定就有第一頁(yè)
public boolean firstEnable() {
return previousEnable();
}
// 判斷能否到上一頁(yè)
public boolean previousEnable() {
return currentPage > 1;// 只要不是第一頁(yè)，就能到上一頁(yè)
}
// 判斷能否到下一頁(yè)
public boolean nextEnable() {
return currentPage * rowsPerPage < this.totalCount;
}
// 判斷能否到最后一頁(yè)；只要有下一頁(yè)，就肯定有最后一頁(yè).
public boolean lastEnable() {
return nextEnable();
}
// 跳到第一頁(yè)
public void firstPage() {
currentPage = 1;
}
// 跳到上一頁(yè)
public void previousPage(int cPage) {
currentPage = (cPage - 1) > 0 ? (cPage - 1) : 1;
}
// 跳到下一頁(yè)
public void nextPage(int cPage) {
currentPage = cPage + 1;
if (currentPage * rowsPerPage > this.totalCount) {
lastPage();
}
}
// 跳到最后一頁(yè)
public void lastPage() {
if (this.totalCount % rowsPerPage == 0) {
currentPage = this.totalCount / rowsPerPage;
} else {
currentPage = this.totalCount / rowsPerPage + 1;
}
}
// 跳到指定的某一頁(yè)
public void gotoPage(int pageNumber) {
if (pageNumber <= 1) {
currentPage = 1;
} else if (getTotalCount() < this.getRowsPerPage()) {
currentPage = 1;
} else if (pageNumber * rowsPerPage >= this.totalCount) {
lastPage();
} else {
currentPage = pageNumber;
}
}
// 設(shè)置總行數(shù)
public void setTotalCount(int totalCount) {
this.totalCount = totalCount;
}
// 得到總行數(shù)
public int getTotalCount() {
return totalCount;
}
// 設(shè)置每頁(yè)行數(shù)
public void setRowsPerPage(int rowsPerPage) {
this.rowsPerPage = rowsPerPage;
}
// 得到每頁(yè)行數(shù)
public int getRowsPerPage() {
return rowsPerPage;
}
// 得到總頁(yè)數(shù)
public int getPages() {
if (this.totalCount % rowsPerPage == 0)
return this.totalCount / rowsPerPage;
else
return this.totalCount / rowsPerPage + 1;
}
// 得到當(dāng)前頁(yè)數(shù)
public int getCurrentPage() {
return currentPage;
}
// 設(shè)置當(dāng)前頁(yè)數(shù)
public void setCurrentPage(int currentPage) {
this.currentPage = currentPage;
}
public int getPageListSize() {
return pageListSize;
}
// 設(shè)置頁(yè)碼列表大小
public void setPageListSize(int pageListSize) {
this.pageListSize = pageListSize;
}
// 得到頁(yè)面列表
public List<Integer> getPageNumList() {
this.pageNumList.removeAll(this.pageNumList);// 設(shè)置之前先清空
int totalPage = getPages();
if (totalPage > this.pageListSize) {
int halfSize = this.pageListSize / 2;
int first = 1;
int end = 1;
if (this.currentPage - halfSize < 1) { // 當(dāng)前頁(yè)靠近最小數(shù)1
first = 1;
end = this.pageListSize;
} else if (totalPage - this.currentPage < halfSize) { // 當(dāng)前頁(yè)靠近最大數(shù)
first = totalPage - this.pageListSize + 1;
end = totalPage;
} else {
first = this.currentPage - halfSize;
end = this.currentPage + halfSize;
}
for (int i = first; i <= end; i++) {
this.pageNumList.add(i);
}
} else {
for (int i = 0; i < totalPage; i++) {
this.pageNumList.add(i + 1);
}
}
return pageNumList;
}
}