Java分頁
阿新 • • 發佈：2019-01-18
1.編寫通用的分頁工具public
class PageUtil { /*引數需要頁面傳入*/
private Integer pageSize=10;//每頁顯式多少條記錄
private Integer currentPage=1;//當前頁號
/*引數需要從資料查詢*/
private Integer allRowsAmount=0;//總記錄數
private List<?> items;//記錄集合
/*這些引數由計算得出*/
private Integer allPageAmount;//總頁數
private Integer currentPageStartRow=1;//當前頁面的開始行
private Integer currentPageEndRow;//當前頁面的結束行
private Integer firstPage=1;//首頁的頁號
private Integer lastPage;//末頁的頁號
private Integer prevPage;//上一頁頁號
private Integer nextPage;//下一頁頁號
private Integer startPageNum;//導航開始頁號
private Integer endPageNum;//導航結束頁號
private Integer maxPageAmount =10;//最多顯示多少頁
public List<Integer> showPageNums =new ArrayList<Integer>();//要顯示的頁號
public PageUtil() {
super(); // TODO Auto-generated constructor stub } /*設定當前頁*/
public void setCurrentPage(int currentPage){
if(currentPage <1){ this.currentPage=1; }else{ this.currentPage=currentPage;
} } /*設定每頁記錄數，預設10條*/
public void setPageSize(int pageSize) {
this.pageSize = pageSize;
} /*設定總記錄數*/ public void setAllRowsAmount(int allRowsAmount) {
this.allRowsAmount = allRowsAmount;
} /*設定分頁內容*/ public void setItems(List<?> items) {
this.items = items; } /*設定導航頁數量*/
public void setMaxPageAmount(int maxPageAmount) {
this.maxPageAmount = maxPageAmount;
} public void calculatePage(){
//計算總頁數 if(this.allRowsAmount % this.pageSize ==0){ this.allPageAmount=this.allRowsAmount/this.pageSize; }else{ this.allPageAmount=this.allRowsAmount/this.pageSize+1;
} //設定首頁 this.firstPage=1;
//設定末頁 this.lastPage=this.allPageAmount; if(this.currentPage *pageSize <allRowsAmount){ this.currentPageEndRow =this.currentPage*pageSize; this.currentPageStartRow =(this.currentPage-1)*pageSize+1; }else{ this.currentPageEndRow =this.allRowsAmount;
this.currentPageStartRow =(this.allPageAmount-1)*pageSize+1;
if(this.currentPageStartRow <0){
this.currentPageStartRow=0;
} } //設定前一頁 if(this.currentPage >1){ this.prevPage=this.currentPage-1; }else{ this.prevPage=this.currentPage;
} //設定下一頁 if(this.currentPage <this.lastPage){
this.nextPage=this.currentPage+1;
}else{ this.nextPage=this.lastPage; } //計算數字導航頁 startPageNum =Math.max(this.currentPage-maxPageAmount/2, firstPage); endPageNum =Math.min(startPageNum+maxPageAmount, lastPage); if(endPageNum-startPageNum <maxPageAmount){ startPageNum =Math.max(endPageNum -maxPageAmount , 1); } for(int i=startPageNum ;i<=endPageNum;i++){
showPageNums.add(i);
} } //以下get方法是對外提供的方法用來獲取引數值
public Integer getPageSize() {
return pageSize; } public Integer getCurrentPage() {
return currentPage; } public Integer getAllRowsAmount() {
return allRowsAmount;
} public List<?> getItems() {
return items; } public Integer getAllPageAmount() {
return allPageAmount;
} public Integer getCurrentPageStartRow() {
return currentPageStartRow;
} public Integer getCurrentPageEndRow() {
return currentPageEndRow;
} public Integer getFirstPage() {
return firstPage; } public Integer getLastPage() {
return lastPage; } public Integer getPrevPage() {
return prevPage; } public Integer getNextPage() {
return nextPage; } public Integer getStartPageNum() {
return startPageNum;
} public Integer getEndPageNum() {
return endPageNum; } public Integer getMaxPageAmount() {
return maxPageAmount;
} public List<Integer> getShowPageNums() {
return showPageNums;
} @Override public String toString() { return "PageUtil [pageSize=" + pageSize + ", currentPage="