java 分頁

import javax.servlet.http.HttpServletRequest;
/**
 * 該類主要是用於分頁。
 * @author 鄔小洪
 * 2009.01.02
 */
public class PagesUtil {
 //總記錄條數
 private int totalRecords=0;
 //總頁面數
 private int totalPages=0;
 //當前頁數
 private int currentPage=0;
 //是否初始化
 private boolean inited=false;
 /**
  * 初始化參數
  * @param request 頁面請求
  * @param allRecord 總記錄數
  * @param pageRows 每頁顯示的記錄數
  */
 public void init(HttpServletRequest request,int totalRecordsIn,int pageRows){
  
  totalRecords = totalRecordsIn;
  //獲得總頁面數
  totalPages = (totalRecords + pageRows - 1) / pageRows;
  //判斷參數currentPage是否爲空
  String currentPageStr = request.getParameter("currentPage");
  if (currentPageStr == null||currentPageStr.length()==0)
   currentPage = 0;//初始值爲0
  else
   currentPage = Integer.parseInt(currentPageStr);
  //判斷當前頁
  if (currentPage < 0) {
   currentPage = 0;
  } else if (currentPage > totalPages - 1 && totalPages >= 1) {
   currentPage = totalPages - 1;
  }
  inited=true;
 }
 /**
  * 返回分頁的結果.
  * @param recordPages 當前頁前後顯示的頁面數
  * @param urlParam 提交頁面地址
  * @return 1 2 3 4 5 6 7 8 9 10 11  共332條  共34頁  第[6]頁  首頁  上一頁  下一頁  尾頁
  */
 public String getPages(int recordPages,String urlParam){
  if(!inited){
   System.out.println("請先調用初始化方法：init(HttpServletRequest request,int allRecord,int pageRows)");
   return "";
  }
  StringBuffer pageBuffer = new StringBuffer();
  if(totalRecords!=0){
   for (int n = 0; n < totalPages; n++){
    if(n<=(currentPage+recordPages)&&n>=(currentPage-recordPages)){
     if(currentPage==n){
      pageBuffer.append("<font color='red'>");
      pageBuffer.append(n+1);
      pageBuffer.append("</font>");
     }else{
      pageBuffer.append("<a href='");
      pageBuffer.append(urlParam);
      pageBuffer.append("&currentPage=");
      pageBuffer.append(n);
      pageBuffer.append("'>");
      pageBuffer.append(n+1);
      pageBuffer.append("</a>");
     }
     pageBuffer.append("&nbsp;");
    }
   }
   
   pageBuffer.append("&nbsp;");
   
   pageBuffer.append("共");
   pageBuffer.append(totalRecords);
   pageBuffer.append("條");
   
   pageBuffer.append("&nbsp;&nbsp;");
   
   pageBuffer.append("共");
   pageBuffer.append(totalPages);
   pageBuffer.append("頁");
   
   pageBuffer.append("&nbsp;&nbsp;");
   
   pageBuffer.append("第[<font color='red'>");
   pageBuffer.append(currentPage+1);
   pageBuffer.append("</font>]頁");
   
   pageBuffer.append("&nbsp;&nbsp;");
   
   if(totalPages>1){
//    首頁
    if(totalPages>1&&currentPage>0){
     pageBuffer.append("<a href='");
     pageBuffer.append(urlParam);
     pageBuffer.append("&currentPage=0");
     pageBuffer.append("'>首頁</a>");
    }else{
     pageBuffer.append("首頁");
    }
    
    pageBuffer.append("&nbsp;&nbsp;");
    
    //上一頁
    if(currentPage>0){
     pageBuffer.append("<a href='");
     pageBuffer.append(urlParam);
     pageBuffer.append("&currentPage=");
     pageBuffer.append(currentPage-1);
     pageBuffer.append("'>上一頁</a>");
    }else{
     pageBuffer.append("上一頁");
    }
    
    pageBuffer.append("&nbsp;&nbsp;");
    
    //下一頁
    if(currentPage<totalPages-1){
     pageBuffer.append("<a href='");
     pageBuffer.append(urlParam);
     pageBuffer.append("&currentPage=");
     pageBuffer.append(currentPage+1);
     pageBuffer.append("'>下一頁</a>");
    }else{
     pageBuffer.append("下一頁");
    }
    
    pageBuffer.append("&nbsp;&nbsp;");
       
    //尾頁
    if(totalPages>1&&currentPage<totalPages-1){
     pageBuffer.append("<a href='");
     pageBuffer.append(urlParam);
     pageBuffer.append("&currentPage=");
     pageBuffer.append(totalPages-1);
     pageBuffer.append("'>尾頁</a>");
    }else{
     pageBuffer.append("尾頁");
    }
   }
   
  }
  return pageBuffer.toString();
 }
 /**
  * 獲取當前頁面數
  * @return 當前頁面數
  */
 public int getCurrentPage() {
  if(!inited){
   System.out.println("請先調用初始化方法：init(HttpServletRequest request,int allRecord,int pageRows)");
   return 0;
  }
  return currentPage;
 }
}

 

使用方法：創建test.jsp

<%@ page pageEncoding="UTF-8"%>
<jsp:directive.page import="*.PagesUtil"/>
<%

PagesUtil pu = new PagesUtil();
pu .init(request,10000,10);
String urlParam = "./test.jsp?";
%>
<%=pu .getPages(5,urlParam) %>