struts分页.rar

package student_info.commons; import student_info.model.beans.S_I_Bean; import java.util.*; /** * @作者 李敏强 * Struts分页显示逻辑Bean */ public class PageBean { int currentPage=1; //当前页 public int totalPages=0; //总页数 int pageRecorders=5;//每页5条数据 int totalRows=0; //总数据数 int pageStartRow=0;//每页的起始数 int pageEndRow=0; //每页显示数据的终止数 boolean hasNextPage=false; //是否有下一页 boolean hasPreviousPage=false; //是否有前一页 ArrayList arrayList; Iterator it; public PageBean(){} public PageBean(ArrayList arrayList){ this.arrayList=arrayList; totalRows=arrayList.size();//bean的个数 it=arrayList.iterator(); 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; } } /** * @return Returns the currentPage. */ public String getCurrentPage() { return this.toString(currentPage); } /** * @param currentPage The currentPage to set. */ public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } /** * @return Returns the pageRecorders. */ public int getPageRecorders() { return pageRecorders; } /** * @param pageRecorders The pageRecorders to set. */ public void setPageRecorders(int pageRecorders) { this.pageRecorders = pageRecorders; } /** * @return Returns the pageEndRow. */ public int getPageEndRow() { return pageEndRow; } /** * @return Returns the pageStartRow. */ public int getPageStartRow() { return pageStartRow; } /** * @return Returns the totalPages. */ public String getTotalPages() { return this.toString(totalPages); } /** * @return Returns the totalRows. */ public String getTotalRows() { return this.toString(totalRows); } /** * @return Returns the hasNextPage. */ public boolean isHasNextPage() { return hasNextPage; } /** * @param hasNextPage The hasNextPage to set. */ public void setHasNextPage(boolean hasNextPage) { this.hasNextPage = hasNextPage; } /** * @return Returns the hasPreviousPage. */ public boolean isHasPreviousPage() { return hasPreviousPage; } /** * @param hasPreviousPage The hasPreviousPage to set. */ public void setHasPreviousPage(boolean hasPreviousPage) { this.hasPreviousPage = hasPreviousPage; } public S_I_Bean[] getNextPage(){ currentPage=currentPage+1; System.out.println("PageBean.getNextPage()正在执行；"); System.out.println("参数currentPage="+currentPage); if((currentPage-1)>0){ hasPreviousPage=true; } else{ hasPreviousPage=false; } if(currentPage>=totalPages) { hasNextPage=false; } else{ hasNextPage=true; } System.out.println("参数hasNextPage="+hasNextPage); System.out.println("准备执行PageBean.getAddressBooks()"); S_I_Bean[] sibeans=getS_I_Beans(); this.description(); return sibeans; } public S_I_Bean[] 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; } S_I_Bean[] sibeans=getS_I_Beans(); this.description(); return sibeans; } public S_I_Bean[] getS_I_Beans(){ System.out.println("pageBean.getBooks（）开始执行；"); if(currentPage*pageRecorders<totalRows){//判断是否为最后一页 pageEndRow=currentPage*pageRecorders; pageStartRow=pageEndRow-pageRecorders; } else{ pageEndRow=totalRows; pageStartRow=pageRecorders*(totalPages-1); } S_I_Bean[] sibeans=new S_I_Bean[pageEndRow-pageStartRow+1]; System.out.println("pageStartRow="+pageStartRow); System.out.println("pageEndRow="+pageEndRow); int j=0; for(int i=pageStartRow;i<pageEndRow;i++) { S_I_Bean sibean=(S_I_Bean)arrayList.get(i); sibeans[j++]=sibean; } System.out.println("要显示的页面数据已经封装,具体信息如下："); this.description(); return sibeans; } public String toString(int temp) { String str=Integer.toString(temp); return str; } public void description() { String description="共有数据数:"+this.getTotalRows()+ "共有页数: "+this.getTotalPages() + "当前页数为:"+this.getCurrentPage()+ " 是否有前一页: "+this.isHasPreviousPage() + " 是否有下一页:"+this.isHasNextPage()+ " 开始行数:"+this.getPageStartRow()+ " 终止行数:"+this.getPageEndRow(); System.out.println(description); } }