pager.java

利用struts开发的一个分页源码示例,可以直接导入到myeclipse下.

package com.yourcompany.util;

import java.util.ArrayList;
import java.util.List;

import com.yourcompany.vo.User;

public class Pager {
	private int currentPage=1;//当前页
	private int totalPages=0;//总页数
	private int pageRecorders=5;//每页5行
	private int totalRows=0;//总行数
	private int pageStartRow=0;//每页的起始行
	private int pageEndRow=0;//每页显示的终止数
	private boolean hasNextPage=false;//有没有下一页
	private boolean hasPreviousPage=false;//有没有上一页
	@SuppressWarnings("unused")
	private List list;
	/**
	 * 用于初始化，
	 * 也就是说，只要你传过来你一个list就可以分页
	 * @param list
	 */
	public Pager(List list){
		this.list=list;
		totalRows=list.size();
		hasPreviousPage=false;
		currentPage=1;
		if(totalRows%pageRecorders==0){
			totalPages=totalRows/pageRecorders;
					
		}else{
			totalPages=totalRows/pageRecorders+1;
		}
		if(currentPage>=totalPages){
			hasNextPage=false;
		}else{
			hasNextPage=true;
		}
		if(totalRows<pageRecorders){
			this.pageStartRow=0;
			this.pageEndRow=totalRows;
		}else{
			this.pageStartRow=0;
			this.pageEndRow=pageRecorders;
		}
		
	}
	public int getCurrentPage() {
		return currentPage;
	}
	public void setCurrentPage(int currentPage) {
		this.currentPage = currentPage;
	}
	public boolean isHasNextPage() {
		return hasNextPage;
	}
	public void setHasNextPage(boolean hasNextPage) {
		this.hasNextPage = hasNextPage;
	}
	public boolean isHasPreviousPage() {
		return hasPreviousPage;
	}
	public void setHasPreviousPage(boolean hasPreviousPage) {
		this.hasPreviousPage = hasPreviousPage;
	}
	public int getPageEndRow() {
		return pageEndRow;
	}
	public void setPageEndRow(int pageEndRow) {
		this.pageEndRow = pageEndRow;
	}
	public int getPageRecorders() {
		return pageRecorders;
	}
	public void setPageRecorders(int pageRecorders) {
		this.pageRecorders = pageRecorders;
	}
	public int getPageStartRow() {
		return pageStartRow;
	}
	public void setPageStartRow(int pageStartRow) {
		this.pageStartRow = pageStartRow;
	}
	public String getTotalPages() {
		return this.toString(totalPages);
	}
	public void setTotalPages(int totalPages) {
		this.totalPages = totalPages;
	}
	public String getTotalRows() {
		return this.toString(totalRows);
	}
	public void setTotalRows(int totalRows) {
		this.totalRows = totalRows;
	}
	public void getFirstPage(){
		currentPage=1;
		hasPreviousPage=false;
		if(currentPage>=totalPages){
			hasNextPage=false;
		}else{
			hasNextPage=true;
		}
	}
	public void getNextPage(){
		currentPage=currentPage+1;
		if((currentPage-1)>0){
			hasPreviousPage=true;
		}else{
			hasPreviousPage=false;
		}
		if(currentPage>=totalPages){
			hasNextPage=false;
		}else{
			hasNextPage=true;
		}
	}
	public void getPreviousPage(){
		currentPage=currentPage-1;
		if(currentPage==0){
			currentPage=1;
		}
		if(currentPage>=totalPages){
			hasNextPage=false;
		}else{
			hasNextPage=true;
		}
		if((currentPage-1)>0){
			hasPreviousPage=true;
		}else{
			hasPreviousPage=false;
		}
	}
	public void getLastPage(){
		currentPage=totalPages;
		if(currentPage==0){
			currentPage=1;
		}
		hasNextPage=false;
		if((currentPage-1)>0){
			hasPreviousPage=true;
		}else{
			hasPreviousPage=false;
		}
	}
	public void setGotoPage(int gotoPage){
		this.currentPage=gotoPage;
		hasNextPage=true;
		hasPreviousPage=true;
		if(currentPage<=1){
			currentPage=1;
			hasNextPage=true;
			hasPreviousPage=false;
		}
		if(currentPage>=totalPages){
			currentPage=totalPages;
			hasNextPage=false;
			hasPreviousPage=true;
		}
	}
	@SuppressWarnings("unchecked")
	public List getPageList(){
		if(currentPage*pageRecorders<totalRows){
			pageEndRow=currentPage*pageRecorders;
			pageStartRow=pageEndRow-pageRecorders;
			
		}else{
			pageEndRow=totalRows;
			pageStartRow=pageRecorders*(totalPages-1);
		}
		System.out.println("start"+pageStartRow);
		System.out.println("end"+pageEndRow);
		List templist=new ArrayList();
		int j=0;
		for(int i=pageStartRow;i<pageEndRow;i++){
			User user=(User)list.get(i);
			templist.add(j,user);
			j++;
		}
		return templist;
	}
	public String toString(int temp){
		
		return Integer.toString(temp);
	}

}