Java后台进行分页参数类封装

/*** 分页参数封装类
 */
public classPageParam {

    private Integer pageNum;//当前页面
    private Integer pageSize;//页面大小

    public static final int DEFAULT_PAGE_NUM = 0; //默认页面
    public static final int DEFAULT_PAGE_SIZE = 20; //默认分页大小
    public static final String PAGE_NUM = "pageNum";
    public static final String PAGE_SIZE = "pageSize";


    /*** 默认构造函数
     */
    publicPageParam() {

    }

    /*** 构造函数,起始位置为0,默认分页大小为10.
     * 
     * @paramrequest
     * @param
     */
    publicPageParam(HttpServletRequest request) {
        //处理分页参数
        String strPageNum =request.getParameter(PAGE_NUM);
        String strPageSize =request.getParameter(PAGE_SIZE);

        if (strPageSize != null &&StringUtils.isNoneBlank(strPageSize)) {
            pageSize =Integer.parseInt(strPageSize);
        } else{
            this.pageSize =DEFAULT_PAGE_SIZE;
        }
        if (strPageNum != null &&StringUtils.isNoneBlank(strPageNum)) {
            this.pageNum = Integer.parseInt(strPageNum) < 1 ? 0 :((Integer.parseInt(strPageNum) - 1)*pageSize);//如果传入参数小于1则默认为0
        } else{
            this.pageNum =DEFAULT_PAGE_NUM;
        }
    }


    publicInteger getPageNum() {
        returnpageNum;
    }

    public voidsetPageNum(Integer pageNum) {
        this.pageNum =pageNum;
    }

    publicInteger getPageSize() {
        returnpageSize;
    }

    public voidsetPageSize(Integer pageSize) {
        this.pageSize =pageSize;
    }

    @Override
    publicString toString() {
        return "PageParam [pageNum=" + pageNum + ", pageSize=" + pageSize + "]";
    }

}