studentaction.java

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package com.bookshop.web.action;

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

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import com.bookshop.dao.StudentDAO;
import com.bookshop.dto.Student;
import com.bookshop.web.page.PageBean;


public class StudentAction {
	public void execute(HttpServletRequest request, HttpServletResponse response)
	throws ServletException, IOException {
		StudentDAO studentdao=new StudentDAO();
		String action = request.getParameter("action");	
        System.out.println(action);
        response.setHeader("Cache-Control", "no-cache");
		PrintWriter out = response.getWriter();
		HttpSession session=request.getSession();
		StringBuffer buf = new StringBuffer();
		if ("initPage".equals(action)){
			int curPage=1;
			int rowsPerPage=10;
			int row=0;
			List list=null;
			PageBean pageBean=new PageBean();
			row=studentdao.getStudentMaxRow();
			pageBean.setCurPage(curPage);
			pageBean.setRowsPerPage(rowsPerPage);
			pageBean.setMaxRowCount(row);
			session.setAttribute("pageBean",pageBean);
			list=studentdao.getStudent(1,10);
			buf.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
			buf.append("<students>");
			for (int i = 0; i < list.size(); i++) {
    			Student s = (Student) list.get(i);
    			buf.append("<student>");
    			buf.append("<id>" + s.getId() + "</id>");
    			buf.append("<name>" + s.getSno() + "</name>");
    			buf.append("<class>" + s.getName() + "</class>");
    			buf.append("</student>");
    		}
			buf.append("<maxPage>" + pageBean.getMaxPage() + "</maxPage>");
    		buf.append("</students>");
    		out.println(buf.toString());
        }else if("show".equals(action)){
        	List list=null;
        	PageBean pageBean=new PageBean();
        	pageBean=(PageBean)session.getAttribute("pageBean");
        	int rowsPerPage=pageBean.getRowsPerPage();
        	int curPage=Integer.parseInt(request.getParameter("curPage"));
        	int from=curPage*rowsPerPage-(rowsPerPage-1);
        	int to=from+rowsPerPage-1;
        	list=studentdao.getStudent(from, to);
    		buf.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
    		buf.append("<students>");
    		for (int i = 0; i < list.size(); i++) {
    			Student s = (Student) list.get(i);
    			buf.append("<student>");
    			buf.append("<id>" + s.getId() + "</id>");
    			buf.append("<name>" + s.getSno() + "</name>");
    			buf.append("<class>" + s.getName() + "</class>");
    			buf.append("</student>");
    		}
    		buf.append("</students>");
    		out.println(buf.toString());
		}
	}
}