public class RouteServlet extends BaseServlet {

    private RouteService routeService = new RouteServiceImpl();

    /**
     * 分页查询
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void pageQuery(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.接受参数
        String currentPageStr = request.getParameter("currentPage");
        String pageSizeStr = request.getParameter("pageSize");
        String cidStr = request.getParameter("cid");

        //接受rname 线路名称
        String rname = request.getParameter("rname");
        rname = new String(rname.getBytes("iso-8859-1"),"utf-8");


        int cid = 0;//类别id
        //2.处理参数
        if(cidStr != null && cidStr.length() > 0){
            cid = Integer.parseInt(cidStr);
        }
        int currentPage = 0;//当前页码，如果不传递，则默认为第一页
        if(currentPageStr != null && currentPageStr.length() > 0){
            currentPage = Integer.parseInt(currentPageStr);
        }else{
            currentPage = 1;
        }

        int pageSize = 0;//每页显示条数，如果不传递，默认每页显示5条记录
        if(pageSizeStr != null && pageSizeStr.length() > 0){
            pageSize = Integer.parseInt(pageSizeStr);
        }else{
            pageSize = 5;
        }

        //3. 调用service查询PageBean对象
        PageBean<Route> pb = routeService.pageQuery(cid, currentPage, pageSize,rname);

        //4. 将pageBean对象序列化为json，返回
        writeValue(pb,response);

    }

}

Service
public PageBean<Route> pageQuery(int cid, int currentPage, int pageSize,String rname ) {
    //封装PageBean
    PageBean<Route> pb = new PageBean<Route>();
    //设置当前页码
    pb.setCurrentPage(currentPage);
    //设置每页显示条数
    pb.setPageSize(pageSize);
   
    //设置总记录数
    int totalCount = routeDao.findTotalCount(cid,rname);
    pb.setTotalCount(totalCount);
    //设置当前页显示的数据集合
    int start = (currentPage - 1) * pageSize;//开始的记录数
    List<Route> list = routeDao.findByPage(cid,start,pageSize,rname);
    pb.setList(list);

    //设置总页数 = 总记录数/每页显示条数
    int totalPage = totalCount % pageSize == 0 ? totalCount / pageSize :(totalCount / pageSize) + 1 ;
    pb.setTotalPage(totalPage);


    return pb;
}

public class RouteServlet extends BaseServlet {

    private RouteService routeService = new RouteServiceImpl();

    /**
     * 分页查询
     * @param request
     * @param response
     * @throws ServletException
     * @throws IOException
     */
    public void pageQuery(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //1.接受参数
        String currentPageStr = request.getParameter("currentPage");
        String pageSizeStr = request.getParameter("pageSize");
        String cidStr = request.getParameter("cid");

        //接受rname 线路名称
        String rname = request.getParameter("rname");
        rname = new String(rname.getBytes("iso-8859-1"),"utf-8");


        int cid = 0;//类别id
        //2.处理参数
        if(cidStr != null && cidStr.length() > 0){
            cid = Integer.parseInt(cidStr);
        }
        int currentPage = 0;//当前页码，如果不传递，则默认为第一页
        if(currentPageStr != null && currentPageStr.length() > 0){
            currentPage = Integer.parseInt(currentPageStr);
        }else{
            currentPage = 1;
        }

        int pageSize = 0;//每页显示条数，如果不传递，默认每页显示5条记录
        if(pageSizeStr != null && pageSizeStr.length() > 0){
            pageSize = Integer.parseInt(pageSizeStr);
        }else{
            pageSize = 5;
        }

        //3. 调用service查询PageBean对象
        PageBean<Route> pb = routeService.pageQuery(cid, currentPage, pageSize,rname);

        //4. 将pageBean对象序列化为json，返回
        writeValue(pb,response);

    }

}

Service
public PageBean<Route> pageQuery(int cid, int currentPage, int pageSize,String rname ) {
    //封装PageBean
    PageBean<Route> pb = new PageBean<Route>();
    //设置当前页码
    pb.setCurrentPage(currentPage);
    //设置每页显示条数
    pb.setPageSize(pageSize);
   
    //设置总记录数
    int totalCount = routeDao.findTotalCount(cid,rname);
    pb.setTotalCount(totalCount);
    //设置当前页显示的数据集合
    int start = (currentPage - 1) * pageSize;//开始的记录数
    List<Route> list = routeDao.findByPage(cid,start,pageSize,rname);
    pb.setList(list);

    //设置总页数 = 总记录数/每页显示条数
    int totalPage = totalCount % pageSize == 0 ? totalCount / pageSize :(totalCount / pageSize) + 1 ;
    pb.setTotalPage(totalPage);


    return pb;
}