java 分页公用类

package com.cn.ohd.face.payment.pageutil;    import java.util.ArrayList;  import java.util.Enumeration;  import java.util.List;    import javax.servlet.http.HttpServletRequest;    import java.util.Map;    public class PageNumber<E> {        private int totals;        private List<E> bigList;  //总记录集        private List<E> smallList; //当页显示的记录集        private int currentPage = 1;  //当前页        private int pages;  //总页数        private int recorderPage =10; //每页记录数        private int privious; //上一页        private int next; //下一页        private boolean firstPage;//第一页        private boolean lastPage; //最后一页        private String url;            public PageNumber(HttpServletRequest request, List bigList)      {          //根据大List获得总记录数和总页数          this.bigList = bigList;          totals = bigList.size();          if (totals % recorderPage == 0) {              pages = totals / recorderPage;          } else {              pages = totals / recorderPage + 1;          }            //从请求中获得要显示的页码          String page = request.getParameter("pageNo");          if(page!=null && !"".equals(page))          {                          currentPage=Integer.parseInt(page);          }          //根据页码获得小List          if (currentPage == 1) {              firstPage = true;          } else {              firstPage = false;          }          if (currentPage == pages) {              lastPage = true;          } else {              lastPage = false;          }          privious = currentPage - 1;          next = currentPage + 1;          this.smallList = new ArrayList<E>();          for (int i = (currentPage - 1) * recorderPage; i < currentPage                  * recorderPage                  && i < totals; i++) {              smallList.add((E) bigList.get(i));          }          //设置URL参数          Enumeration en = request.getParameterNames();          Map map = request.getParameterMap();          StringBuffer sb = new StringBuffer();          sb.append(request.getRequestURI());          int i=0;          while(en.hasMoreElements())          {              String paramName = (String)en.nextElement();              if(!paramName.equals("pageNo"))              {                  if(i==0)                  {                      sb.append("?");                  }else{                      sb.append("&");                  }                  sb.append(paramName).append("=");                  String[] value = (String[])map.get(paramName);                  sb.append(value[0]);                  i++;              }          }          this.url = sb.toString();      }      public String getUrl() {          return url;      }        public void setUrl(HttpServletRequest request) {          this.url = request.getRequestURI();      }        public boolean isFirstPage() {          return firstPage;      }        public void setFirstPage(boolean firstPage) {          this.firstPage = firstPage;      }        public boolean isLastPage() {          return lastPage;      }        public void setLastPage(boolean lastPage) {          this.lastPage = lastPage;      }        public int getNext() {          return next;      }        public void setNext(int next) {          this.next = next;      }        public int getPrivious() {          return privious;      }        public void setPrivious(int privious) {          this.privious = privious;      }        public List<E> getBigList() {          return bigList;      }        public void setBigList(List<E> bigList) {          this.bigList = bigList;          totals = bigList.size();          if (totals % recorderPage == 0) {              pages = totals / recorderPage;          } else {              pages = totals / recorderPage + 1;          }        }        public int getCurrentPage() {          return currentPage;      }        public void setCurrentPage(int a) {            this.currentPage = a;          if (currentPage == 1) {              firstPage = true;          } else {              firstPage = false;          }          if (currentPage == pages) {              lastPage = true;          } else {              lastPage = false;          }          privious = a - 1;          next = a + 1;          this.smallList = new ArrayList<E>();          for (int i = (currentPage - 1) * recorderPage; i < currentPage                  * recorderPage                  && i < totals; i++) {              smallList.add(bigList.get(i));          }        }        public int getPages() {          return pages;      }        public void setPages(int pages) {          this.pages = pages;      }        public List<E> getSmallList() {          return smallList;      }        public void setSmallList(List<E> smallList) {          this.smallList = smallList;      }        public int getTotals() {          return totals;      }        public void setTotals(int totals) {          this.totals = totals;      }        public int getRecorderPage() {          return recorderPage;      }        public void setRecorderPage(int recorderPage) {          this.recorderPage = recorderPage;      }            public void clearBigList()      {          this.bigList = null;      }    }