玩转Web之easyui(一)-----easy ui datagird 分页

easy ui 中数据表格的分页其实是很简单的，分页是在数据表格可以正常显示数据的基础上进行的，在这里给出servlet的代码，其中selectAll()方法是从数据库中提取所有数据，
分页的一种思路是：从数据表中取出所有数据，然后根据分页的要求取出对应的数据。

package thejavabean;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.json.JSONArray;

public class Table_info extends HttpServlet {

	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		try {
			response.setContentType("text/html");
			response.setCharacterEncoding("UTF-8");
			PrintWriter out = response.getWriter();
			String page = request.getParameter("page"); // 当前页数
			String rows = request.getParameter("rows"); // 每页显示行数  
			
			List<Student> allList=selectAll();   //获取所有数据
			int p=Integer.parseInt(page);    
			int r=Integer.parseInt(rows);
			int begin=(p-1)*r;  //当前页开始项
			int num=begin;
			int count=r;
			List<Student> list=new ArrayList();
			System.out.println();
			while(count>0&&num<allList.size()){
				list.add(allList.get(num)); 
				num++;
				count--;
			}
			int total=selectAll().size();
			String json = "{\"total\":"+total+" , \"rows\":"+JSONArray.fromObject(list).toString()+"}";
		    
			response.getWriter().write(json.toString());
			out.flush();
			out.close();
		} catch (SQLException e) {
			e.printStackTrace();
		}
		
	}
    public List<Student> selectAll() throws SQLException{
    	StudentManage sm=new StudentManage();
		return sm.selectAll("");
    	
    }
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		this.doGet(request, response);
		
	}

}