liststudent.java

jsp例程

package business;

import hibernate.Student;
import dao.*;


import java.util.Iterator;
import java.util.List;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.jsp.JspWriter;






public class ListStudent {
	private StudentDAO stuDao;
	
	
	public void list(HttpServletRequest request,HttpServletResponse response ,JspWriter out) throws Exception
	{
		String page=(String)request.getParameter("page");
		
		if(page!=null)
		{
		listpage(request,response,out,Integer.parseInt(page));	
		}
		else{
		listpage(request,response,out,1);	
		}
	}
	
	public void listpage(HttpServletRequest request,HttpServletResponse response,JspWriter out,int page) throws Exception
	{
		String name="",id="",password="",jiguan="",dep="",sex="",tel="",mail="",mark ="",gifadd="";
		byte[] image;
		List list=stuDao.getStudent();
		if(list==null)
		{
			out.println("尚无学生信息");
			return;
		}
		int total=list.size();
		int count=0;
		Iterator it=list.iterator();
		Student stu;
		while(count<(page-1)*5 && it.hasNext())
		{
			it.next();
			count++;
		}
		
		count=0;
		while(it.hasNext()&& count<5)
		{
			stu=(Student)it.next();
			id=stu.getId();
			name=stu.getName();
			password=stu.getPassword();
			jiguan=new String(stu.getJiguan().getBytes("ISO-8859-1"),"GB2312");
			dep=new String(stu.getDepartment().getBytes("ISO-8859-1"),"GB2312");
			sex=new String(stu.getSex().getBytes("ISO-8859-1"),"GB2312");
			if(stu.getMark()!=null)
			{
				mark=stu.getMark().toString();
			}
			tel=stu.getTel();
			if(tel==null || tel.equals(""))
			{
				tel="无";
			}
			mail=stu.getEmail();
			if(mail==null || mail.equals(""))
				mail="无";
            
		    gifadd=stu.getGifAdd();
		    String gif="book_leaf.gif";
		    
			response.setContentType("text/html;charset=GBK");
			out.print("<tr><td>"+id+"</td><td>"+name+"</td><td>"+password+"</td><td>"+jiguan+"</td><td>"+dep+"</td><td>"+sex+"</td><td>"+mark+"</td><td>"+tel+"</td><td>"+mail+"</td><td>"+gifadd+"</td><td><img src=\""+gifadd+"\"+/></td><td><html:img page=\""+gifadd+"\"/></td>");
			out.print("<td><a href=deleteStudent.do?student_id="+stu.getId()+">删除</a></td><td>");
			out.print("<a href=updatestu.jsp?student_id="+stu.getId()+">编辑</a></td>");
			

            image=stu.getImage();
			
			if(image!=null)
			{
			
			 response.setContentType("image/gif;charset=GBK");
		     ServletOutputStream ou=response.getOutputStream();
			 if(image!=null && image.length>0)
			 {
				 
				 ou.write(image);
				 out.print("</tr>");
				 ou.flush();
				
			 }
			 
			}
			 
			count++;
		}
		out.print("<tr><td colspan=5 align=center>");
		out.print("<table width=50% border=0 cellspacing=0><tr>");
		if((page-1)>0)
		{
			out.print("<td width=50% colspan='5'><a href=getstudent.jsp?page="+(page-1)+">上一页</a>  &nbsp;&nbsp;&nbsp;&nbsp;");
			
		}
		if((page-1)<(total/5))
		{
			out.print("<td width=50% colspan='5'><a href=getstudent.jsp?page="+(page+1)+">下一页</a></td>");
			out.print("<img src=\"book_leaf.gif\"/>");
		}
	  
		
	}

	public StudentDAO getStuDao() {
		return stuDao;
	}

	public void setStuDao(StudentDAO stuDao) {
		this.stuDao = stuDao;
	}

}