package cn.itcast.web;

import cn.itcast.domain.PageBean;
import cn.itcast.domain.User;
import cn.itcast.service.Impl.ServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.Map;

/*总页数：pageTotal  userTotal%row==0? userTotal/row : userTotal/row +1
* 每页查询用户数：row 5
* 每页开始的索引 indexStart = （当前页数-1）*每页查询数
* */
@WebServlet("/findByPageServlet")
public class FindByPageServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //设置下编码
        request.setCharacterEncoding("utf-8");
        //接收当前页数thisPage及每页条数row 以及一个参数的集合
        Map<String, String[]> map = request.getParameterMap();
        String thisPage = request.getParameter("thisPage");
        String row = request.getParameter("row");
        //数据库中查询用户的总数：totalCount 33
        ServiceImpl service = new ServiceImpl();
        if ( thisPage==null || "".equals(thisPage)){
            thisPage="1";
        }
        if (row!="8"||"".equals(row)){
            row="8";
        }
        //数据库中查询当前页用户的信息
        PageBean<User> findPage= service.findPageUsers(thisPage,row,map);

        //将数据转发
        request.setAttribute("map",map);
        request.setAttribute("findPage",findPage);
        request.getRequestDispatcher("/list.jsp").forward(request,response);

    }

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

package cn.itcast.web;

import cn.itcast.domain.PageBean;
import cn.itcast.domain.User;
import cn.itcast.service.Impl.ServiceImpl;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.List;
import java.util.Map;

/*总页数：pageTotal  userTotal%row==0? userTotal/row : userTotal/row +1
* 每页查询用户数：row 5
* 每页开始的索引 indexStart = （当前页数-1）*每页查询数
* */
@WebServlet("/findByPageServlet")
public class FindByPageServlet extends HttpServlet {
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //设置下编码
        request.setCharacterEncoding("utf-8");
        //接收当前页数thisPage及每页条数row 以及一个参数的集合
        Map<String, String[]> map = request.getParameterMap();
        String thisPage = request.getParameter("thisPage");
        String row = request.getParameter("row");
        //数据库中查询用户的总数：totalCount 33
        ServiceImpl service = new ServiceImpl();
        if ( thisPage==null || "".equals(thisPage)){
            thisPage="1";
        }
        if (row!="8"||"".equals(row)){
            row="8";
        }
        //数据库中查询当前页用户的信息
        PageBean<User> findPage= service.findPageUsers(thisPage,row,map);

        //将数据转发
        request.setAttribute("map",map);
        request.setAttribute("findPage",findPage);
        request.getRequestDispatcher("/list.jsp").forward(request,response);

    }

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