通讯录查询项目-分页查询servlet

最新推荐文章于 2023-04-28 09:27:03 发布

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本文介绍了一个使用Servlet实现的联系人查询系统，包括分页和行数选择功能。通过ContactQueryServlet2类处理HTTP请求，从数据库获取联系人信息，并将结果转发到list.jsp页面进行展示。

public class ContactQueryServlet2 extends HttpServlet {
ContactServiceImpl contactService = new ContactServiceImpl();

protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    request.setCharacterEncoding("utf-8");
    response.setContentType("text/html;charset=utf-8");
    //设定初始页数
    int up = 1;
    //获得选中第几页
    String page = request.getParameter("page");
    //判断选中的是不是空,如果为空用up的默认值
    if (page != null) {
        up = Integer.parseInt(page);
    }


    //设定初始行数
    int down = 10;
    //获得选中的行数
    String downSize = request.getParameter("down");
    //判断选中的是不是空,如果为空用down的默认值
    if (downSize != null) {
        down = Integer.parseInt(downSize);
    }


    //获取选中访问的第几页
    int realUp = (up - 1) * down;

    //获取一共多少条记录
    int count = contactService.queryCount();

    //计算共有多少页
    int pageCount = (int) Math.ceil(count / (double) down);

    List<Contact> contacts = contactService.queryAll(realUp, down);
    request.setAttribute("contacts", contacts);
    request.setAttribute("pageCount", pageCount);
    request.setAttribute("down", down);
    request.setAttribute("up",up);
    request.getRequestDispatcher("list.jsp").forward(request, response);
}

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    this.doPost(request, response);
}

}