struts分页的一种实现!(一)

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

看到大家对struts的学习热情很高,而且这方面的资料很少,看着大家很累,所以发发善心,看到很好的一种分页方法,就贴出来大家共同分享!(原作在javaworld),有不完善的地方,希望大家改正!!!

使用一个页面控制类,它记录页面信息,如上页,下页,当前页等。在查询的Action中,将这个控制类和查询条件一起传递给数据库访问bean,然后将这两个参数保存在用户session中。在分页控制Action中,利用接收到的分页参数调用数据库访问的bean.

(1)分页控制类

package com.tower.util;

public class PageController {

int totalRowsAmount; file://总行数

boolean rowsAmountSet; file://是否设置过totalRowsAmount

int pageSize=2; file://每页行数

int currentPage=1; file://当前页码

int nextPage;

int previousPage;

int totalPages; file://总页数

boolean hasNext; file://是否有下一页

boolean hasPrevious; file://是否有前一页

String description;

int pageStartRow;

int pageEndRow;

public PageController(int totalRows){

setTotalRowsAmount(totalRows);

}

public PageController(){}

public void setTotalRowsAmount(int i) {

if(!this.rowsAmountSet){

totalRowsAmount = i;

totalPages=totalRowsAmount/pageSize+1;

setCurrentPage(1);

this.rowsAmountSet=true;

}

}

public void setCurrentPage(int i) {

currentPage = i;

nextPage=currentPage+1;

previousPage=currentPage-1;

file://计算当前页开始行和结束行

if(currentPage*pageSize<totalRowsAmount){

pageEndRow=currentPage*pageSize;

pageStartRow=pageEndRow-pageSize+1;

}else{

pageEndRow=totalRowsAmount;

pageStartRow=pageSize*(totalPages-1)+1;

}

if (nextPage>totalPages){

hasNext=false;

}else{

hasNext=true;

}

if(previousPage==0){

hasPrevious=false;

}else{

hasPrevious=true;

};

System.out.println(this.description());

}

public int getCurrentPage() {

return currentPage;

}

public boolean isHasNext() {

return hasNext;

}

public boolean isHasPrevious() {

return hasPrevious;

}

public int getNextPage() {

return nextPage;

}

public int getPageSize() {

return pageSize;

}

public int getPreviousPage() {

return previousPage;

}

public int getTotalPages() {

return totalPages;

}

public int getTotalRowsAmount() {

return totalRowsAmount;

}

public void setHasNext(boolean b) {

hasNext = b;

}

public void setHasPrevious(boolean b) {

hasPrevious = b;

}

public void setNextPage(int i) {

nextPage = i;

}

public void setPageSize(int i) {

pageSize = i;

}

public void setPreviousPage(int i) {

previousPage = i;

}

public void setTotalPages(int i) {

totalPages = i;

}

public int getPageEndRow() {

return pageEndRow;

}

public int getPageStartRow() {

return pageStartRow;

}

public String getDescription(){

String description="Total:"+this.getTotalRowsAmount()+

" items "+this.getTotalPages() +" pages";

// this.currentPage+" Previous "+this.hasPrevious +

// " Next:"+this.hasNext+

// " start row:"+this.pageStartRow+

// " end row:"+this.pageEndRow;

return description;

}

public String description(){

String description="Total:"+this.getTotalRowsAmount()+

" items "+this.getTotalPages() +" pages,Current page:"+

this.currentPage+" Previous "+this.hasPrevious +

" Next:"+this.hasNext+

" start row:"+this.pageStartRow+

" end row:"+this.pageEndRow;

return description;

}

public static void main(String args[]){

PageController pc=new PageController(3);

System.out.println(pc.getDescription());

// pc.setCurrentPage(2);

// System.out.println(pc.description());

// pc.setCurrentPage(3);

// System.out.println(pc.description());

}

 
 
 
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