ssah.rar_ajax_struct ajax_struct+spring

package util; import java.util.Vector; import java.util.Iterator; import java.util.List; public class PageHolder { private boolean debug = true; //调试开关 private Vector items = new Vector(); private int pagesize = 0; //一页尺寸 private int totalpages = 0; //总页数 private int total = 0; //总条目数 private int lastpageitems = 0; //尾页条目数 private int currentpage = 0; //当前页 private boolean haspre = false; //有前驱 private boolean hasnext = false; //有后继 private boolean isempty = true; //空 public void initPageHolder(Vector _items, int _pagesize) { items = _items; pagesize = _pagesize; //非空 if (items.size() > 0) { isempty = false; currentpage = 1; total = items.size(); //条目分页余数 lastpageitems = total % pagesize; if (debug) { System.out.println("lastpageitems:" + lastpageitems); } //余数为0，尾页满页 if (lastpageitems == 0) { totalpages = total / pagesize; if (debug) { System.out.println("totalpages:" + totalpages); } } //尾页不满页 else { totalpages = total / pagesize + 1; if (debug) { System.out.println("totalpages:" + totalpages); } } //多于1页，首页有后继 if (totalpages > 1) { hasnext = true; } } } public Iterator getCurrentPage() { //尾页，返回尾页第一条到全体末条记录 if (currentpage == totalpages) { return items.subList(pagesize * (currentpage - 1), total).iterator(); } //非尾页，返回当前页之条目 else { return items.subList(pagesize * (currentpage - 1), pagesize * currentpage). iterator(); } } public List getCurrentPageList() { //尾页，返回尾页第一条到全体末条记录 if (currentpage == totalpages) { return items.subList(pagesize * (currentpage - 1), total); } //非尾页，返回当前页之条目 else { return items.subList(pagesize * (currentpage - 1), pagesize * currentpage); } } public Iterator getItemsByPageID(int pageid) { //页ID超范围 if (pageid < 0 || pageid > totalpages) { System.out.println("pageid out of range ,it shold between 1 to " + totalpages); return null; } else { //当前页 currentpage = pageid; //首页无前驱 if (currentpage <= 1) { haspre = false; } else { haspre = true; } //尾页无后继 if (currentpage >= totalpages) { hasnext = false; } else { hasnext = true; } //返回当前页 return getCurrentPage(); } } public List getItemsListByPageID(int pageid) { //页ID超范围 if (pageid < 0 || pageid > totalpages) { System.out.println("pageid out of range ,it shold between 1 to " + totalpages); return null; } else { //当前页 currentpage = pageid; //首页无前驱 if (currentpage <= 1) { haspre = false; } else { haspre = true; } //尾页无后继 if (currentpage >= totalpages) { hasnext = false; } else { hasnext = true; } //返回当前页 return getCurrentPageList(); } } public int getCurrentPageID() { return currentpage; } public int getTotalNumOfItems() { return total; } public boolean isEmpty() { return isempty; } public boolean hasPre() { return haspre; } public boolean hasNext() { return hasnext; } public int getTotalPages() { return totalpages; } public static void main(String[] args) { PageHolder ph = new PageHolder(); Vector itv = new Vector(); for (int i = 1; i <= 10; i++) { itv.add(new Integer(i)); } System.out.println("item num of Vector to hold:" + itv.size()); ph.initPageHolder(itv, 3); // System.out.println(ph.getTotalPages()); for (int j = 1; j <= ph.getTotalPages(); j++) { System.out.println("content of page :" + j); Iterator it = ph.getItemsByPageID(j); System.out.println("hasnext :" + ph.hasNext()); System.out.println("haspre :" + ph.haspre); while (it.hasNext()) { System.out.println(it.next().toString()); } } } }