personselectall.java

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package com.jxc.servlet.person;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
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 javax.servlet.http.HttpSession;

import com.jxc.dao.*;
import com.jxc.page.ListPage;
import com.jxc.vo.Person;

public class PersonSelectAll extends HttpServlet {

	/**
	 * Constructor of the object.
	 */
	public PersonSelectAll() {
		super();
	}

	/**
	 * Destruction of the servlet. <br>
	 */
	public void destroy() {
		super.destroy(); // Just puts "destroy" string in log
		// Put your code here
	}

	/**
	 * The doGet method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to get.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		this.doPost(request, response);
	}

	/**
	 * The doPost method of the servlet. <br>
	 *
	 * This method is called when a form has its tag value method equals to post.
	 * 
	 * @param request the request send by the client to the server
	 * @param response the response send by the server to the client
	 * @throws ServletException if an error occurred
	 * @throws IOException if an error occurred
	 */
	public void doPost(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
     Connection conn=Conn.getConnection();
     HttpSession session=request.getSession();
     int pagenumber = 0;
		if ("".equals(request.getParameter("pagenumber"))
				|| null == request.getParameter("pagenumber")) {
			pagenumber = 1;
		} else {
			pagenumber = Integer.parseInt((String) request
					.getParameter("pagenumber"));
		}
     ArrayList<Person> list=new PersonTreat().selectAll(conn);
     if(list.size()==0){
   //  HttpSession session=request.getSession();
     session.setAttribute("list", list);
     response.sendRedirect("person_selectall.jsp");
     }else{
    	 ListPage listpage = new ListPage(list, pagenumber, 15);
			int lastpagenumber = listpage.getLastPageNumber();
			if (pagenumber >= lastpagenumber) {
				pagenumber = lastpagenumber;
			}
			List list1 = (List) listpage.getThisPageElements();
			//HttpSession session=request.getSession();
			session.setAttribute("lastpagenumber", lastpagenumber);
			session.setAttribute("pagenumber", pagenumber);
			session.setAttribute("list", list1);
			 response.sendRedirect("person_selectall.jsp");
    	 
     }
     
	}

	/**
	 * Initialization of the servlet. <br>
	 *
	 * @throws ServletException if an error occurs
	 */
	public void init() throws ServletException {
		// Put your code here
	}

}