1 public SearchResult paging(List
     
       list, int pageNumber, int pageSize) throws Exception{ 2         List
      
        pageList = new ArrayList
       
        (); 3         int currIdx = (pageNumber > 1 ? (pageNumber -1) * pageSize : 0); 4         for (int i = 0; i < pageSize && i < list.size() - currIdx; i++){ 5             T listNew = list.get(currIdx + i); 6             pageList.add(listNew); 7         } 8         SearchResult
        
          searchResult = new SearchResult
         
          (); 9         searchResult.setList(pageList);10         searchResult.setTotal(list.size());11         if (searchResult.getTotal()%pageSize == 0){12             searchResult.setPages((int)searchResult.getTotal()/pageSize);13         }else {14             searchResult.setPages((int)searchResult.getTotal()/pageSize + 1);15         }16         searchResult.setPageNum(pageNumber);17         searchResult.setPageSize(pageSize);18         searchResult.setSize(pageList.size());19         //是否是第一页20         if (pageNumber == 1){21             searchResult.setIsFirstPage(true);22         }else {23             searchResult.setIsFirstPage(false);24         }25         //是否是最后一页26         if ((searchResult.getTotal() - pageNumber*pageSize) > 0){27             searchResult.setIsLastPage(false);28         }else {29             searchResult.setIsLastPage(true);30         }31         return searchResult;32     }
         
        
       
      
     

public class PageInfo
     
       implements Serializable {
       private static final long serialVersionUID = 1L;     //当前页     private int pageNum;     //每页的数量     private int pageSize;     //当前页的数量     private int size;     //排序     private String orderBy;     //由于startRow和endRow不常用，这里说个具体的用法     //可以在页面中"显示startRow到endRow 共size条数据"     //当前页面第一个元素在数据库中的行号     private int startRow;     //当前页面最后一个元素在数据库中的行号     private int endRow;     //总记录数     private long total;     //总页数     private int pages;     //结果集     private List
      
        list;     //前一页     private int prePage;     //下一页     private int nextPage;     //是否为第一页     private boolean isFirstPage = false;     //是否为最后一页     private boolean isLastPage = false;     //是否有前一页     private boolean hasPreviousPage = false;     //是否有下一页     private boolean hasNextPage = false;     //导航页码数     private int navigatePages;     //所有导航页号     private int[] navigatepageNums;     //导航条上的第一页     private int navigateFirstPage;     //导航条上的最后一页     private int navigateLastPage;     public PageInfo() {
       }     /**      * 包装Page对象      *      * @param list      */     public PageInfo(List
       
         list) {
           this(list, 8);     }     /**      * 包装Page对象      *      * @param list          page结果      * @param navigatePages 页码数量      */     public PageInfo(List
        
          list, int navigatePages) {
           if (list instanceof Page) {
               Page page = (Page) list;             this.pageNum = page.getPageNum();             this.pageSize = page.getPageSize();             this.orderBy = page.getOrderBy();             this.pages = page.getPages();             this.list = page;             this.size = page.size();             this.total = page.getTotal();             //由于结果是>startRow的，所以实际的需要+1             if (this.size == 0) {
                   this.startRow = 0;                 this.endRow = 0;             } else {
                   this.startRow = page.getStartRow() + 1;                 //计算实际的endRow（最后一页的时候特殊）                 this.endRow = this.startRow - 1 + this.size;             }         } else if (list instanceof Collection) {
               this.pageNum = 1;             this.pageSize = list.size();             this.pages = 1;             this.list = list;             this.size = list.size();             this.total = list.size();             this.startRow = 0;             this.endRow = list.size() > 0 ? list.size() - 1 : 0;         }         if (list instanceof Collection) {
               this.navigatePages = navigatePages;             //计算导航页             calcNavigatepageNums();             //计算前后页，第一页，最后一页             calcPage();             //判断页面边界             judgePageBoudary();         }     }     /**      * 计算导航页      */     private void calcNavigatepageNums() {
           //当总页数小于或等于导航页码数时         if (pages <= navigatePages) {
               navigatepageNums = new int[pages];             for (int i = 0; i < pages; i++) {
                   navigatepageNums[i] = i + 1;             }         } else { //当总页数大于导航页码数时             navigatepageNums = new int[navigatePages];             int startNum = pageNum - navigatePages / 2;             int endNum = pageNum + navigatePages / 2;             if (startNum < 1) {
                   startNum = 1;                 //(最前navigatePages页                 for (int i = 0; i < navigatePages; i++) {
                       navigatepageNums[i] = startNum++;                 }             } else if (endNum > pages) {
                   endNum = pages;                 //最后navigatePages页                 for (int i = navigatePages - 1; i >= 0; i--) {
                       navigatepageNums[i] = endNum--;                 }             } else {
                   //所有中间页                 for (int i = 0; i < navigatePages; i++) {
                       navigatepageNums[i] = startNum++;                 }             }         }     }     /**      * 计算前后页，第一页，最后一页      */     private void calcPage() {
           if (navigatepageNums != null && navigatepageNums.length > 0) {
               navigateFirstPage = navigatepageNums[0];             navigateLastPage = navigatepageNums[navigatepageNums.length - 1];             if (pageNum > 1) {
                   prePage = pageNum - 1;             }             if (pageNum < pages) {
                   nextPage = pageNum + 1;             }         }     }     /**      * 判定页面边界      */     private void judgePageBoudary() {
           isFirstPage = pageNum == 1;         isLastPage = pageNum == pages;         hasPreviousPage = pageNum > 1;         hasNextPage = pageNum < pages;     }     public int getPageNum() {
           return pageNum;     }     public void setPageNum(int pageNum) {
           this.pageNum = pageNum;     }     public int getPageSize() {
           return pageSize;     }     public void setPageSize(int pageSize) {
           this.pageSize = pageSize;     }     public int getSize() {
           return size;     }     public void setSize(int size) {
           this.size = size;     }     public String getOrderBy() {
           return orderBy;     }     public void setOrderBy(String orderBy) {
           this.orderBy = orderBy;     }     public int getStartRow() {
           return startRow;     }     public void setStartRow(int startRow) {
           this.startRow = startRow;     }     public int getEndRow() {
           return endRow;     }     public void setEndRow(int endRow) {
           this.endRow = endRow;     }     public long getTotal() {
           return total;     }     public void setTotal(long total) {
           this.total = total;     }     public int getPages() {
           return pages;     }     public void setPages(int pages) {
           this.pages = pages;     }     public List
         
           getList() {
           return list;     }     public void setList(List
          
            list) { this.list = list; } @Deprecated // firstPage就是1, 此函数获取的是导航条上的第一页, 容易产生歧义 public int getFirstPage() { return navigateFirstPage; } @Deprecated public void setFirstPage(int firstPage) { this.navigateFirstPage = firstPage; } public int getPrePage() { return prePage; } public void setPrePage(int prePage) { this.prePage = prePage; } public int getNextPage() { return nextPage; } public void setNextPage(int nextPage) { this.nextPage = nextPage; } @Deprecated // 请用getPages()来获取最后一页, 此函数获取的是导航条上的最后一页, 容易产生歧义. public int getLastPage() { return navigateLastPage; } @Deprecated public void setLastPage(int lastPage) { this.navigateLastPage = lastPage; } public boolean isIsFirstPage() { return isFirstPage; } public void setIsFirstPage(boolean isFirstPage) { this.isFirstPage = isFirstPage; } public boolean isIsLastPage() { return isLastPage; } public void setIsLastPage(boolean isLastPage) { this.isLastPage = isLastPage; } public boolean isHasPreviousPage() { return hasPreviousPage; } public void setHasPreviousPage(boolean hasPreviousPage) { this.hasPreviousPage = hasPreviousPage; } public boolean isHasNextPage() { return hasNextPage; } public void setHasNextPage(boolean hasNextPage) { this.hasNextPage = hasNextPage; } public int getNavigatePages() { return navigatePages; } public void setNavigatePages(int navigatePages) { this.navigatePages = navigatePages; } public int[] getNavigatepageNums() { return navigatepageNums; } public void setNavigatepageNums(int[] navigatepageNums) { this.navigatepageNums = navigatepageNums; } public int getNavigateFirstPage() { return navigateFirstPage; } public int getNavigateLastPage() { return navigateLastPage; } public void setNavigateFirstPage(int navigateFirstPage) { this.navigateFirstPage = navigateFirstPage; } public void setNavigateLastPage(int navigateLastPage) { this.navigateLastPage = navigateLastPage; } @Override public String toString() { final StringBuffer sb = new StringBuffer("PageInfo{"); sb.append("pageNum=").append(pageNum); sb.append(", pageSize=").append(pageSize); sb.append(", size=").append(size); sb.append(", startRow=").append(startRow); sb.append(", endRow=").append(endRow); sb.append(", total=").append(total); sb.append(", pages=").append(pages); sb.append(", list=").append(list); sb.append(", prePage=").append(prePage); sb.append(", nextPage=").append(nextPage); sb.append(", isFirstPage=").append(isFirstPage); sb.append(", isLastPage=").append(isLastPage); sb.append(", hasPreviousPage=").append(hasPreviousPage); sb.append(", hasNextPage=").append(hasNextPage); sb.append(", navigatePages=").append(navigatePages); sb.append(", navigateFirstPage").append(navigateFirstPage); sb.append(", navigateLastPage").append(navigateLastPage); sb.append(", navigatepageNums="); if (navigatepageNums == null) sb.append("null"); else { sb.append('['); for (int i = 0; i < navigatepageNums.length; ++i) sb.append(i == 0 ? "" : ", ").append(navigatepageNums[i]); sb.append(']'); } sb.append('}'); return sb.toString(); } }