java web分页代码

在web开发中，经常会遇到一些数据很多时，我们便需要分页存放，写一个小例子，供以后自己使用

/**
 *java分页程序
 * @author yzz
 */
public class Pagination {
    /***
     *当前页码
     * 总页数
     * 每页显示记录数
     * 总记录数
     */
    private int pageNo = 0;
    private int pageCount = 0;   //总页数
    private int pageSize = 10;    //每页显示记录
    private int countSize = 0;      //总记录数
    
    private String pageBar;
    private String numPageBar;
    private String url;

    public int getPageNo() {
        return pageNo;
    }

    public void setPageNo(int pageNo) {
        this.pageNo = pageNo;
    }

    public int getPageCount() {
        if (countSize != 0)
        {
            /***
             * 如果总记录数能够整除每页的记录数 
             */
            if(countSize%pageSize == 0){
                pageCount = countSize/pageSize;
            }else {
                pageCount = countSize/pageSize + 1;
            }
        }
        return pageCount;
    }

    public void setPageCount(int pageCount) {
        this.pageCount = pageCount;
    }

    public int getPageSize() {
        return pageSize;
    }

    public void setPageSize(int pageSize) {
        this.pageSize = pageSize;
    }

    public int getCountSize() {
        return countSize;
    }

    public void setCountSize(int countSize) {
        this.countSize = countSize;
    }

    public String getPageBar() {
        pageCount = getPageCount();
        if(pageCount != 0) {
            
            if(pageNo < 1) {
                pageNo = 1; //如果当前页小于1则默认1
            }
            if(pageNo > pageCount) {
                pageNo = pageCount;
            }
            StringBuilder sb = new StringBuilder();
            sb.append("每页 ：").append(pageSize).
                    append("  页次: ").append(pageNo).append("/").append(pageCount).
                    append(" 总计: ").append(countSize).append(" ");
             
            sb.append("
");
             if (pageNo == 1) {
                sb.append("
首页 
");
                sb.append("
上页 
");
            } else {
                sb.append("
首页 
");
                sb.append("
上页 
");
            }

            if (pageNo == pageCount) {
                sb.append("
下页 
");
                sb.append("
尾页 
");
            } else {
                sb.append("
下页 
");
                sb.append("
尾页 
");
            }
            sb.append("
");
            pageBar = sb.toString();
        } else {
            pageBar = "";
        }
        
        return pageBar;
    }

    public String getNumPageBar() {
        pageCount = getPageCount();
        
        if (pageCount != 0) {
            //判断当前页号的合法性
            if (pageNo < 1) {
                pageNo = 1;
            }
            if (pageNo > pageCount) {
                pageNo = pageCount;
            }
            StringBuilder sb = new StringBuilder();
            //计算当前页所在的组
            int group = pageNo / 5 + (pageNo % 5 == 0 ? 0 : 1);
            int start = (group - 1) * 5 + 1;
            int end = start + 4;
//            System.out.println("group:" + group + ";start:" + start + ";end:" + end);
            if (end > pageCount) {
                end = pageCount;
            }

            sb.append("
");
            if (start > 1) {
                sb.append("
<
");
            }
            for (int i = start; i <= end; i++) {
                if (pageNo != i) {
                    sb.append("
").append(i).append("
");
                } else {
                    sb.append("
").append(i).append("
");
                }
            }
            if (end < pageCount) {
                sb.append("
>
");
            }
            sb.append("
");
            numPageBar = sb.toString();
        } else {
            numPageBar = "";
        }
        return numPageBar;
    }

    public void setUrl(String url) {
        this.url = url;
    }
    
    
}