servlet 乱码

package op.svltbbms;

 

import java.io.IOException;

import java.io.PrintWriter;

import java.sql.Connection;

import java.sql.PreparedStatement;

import java.sql.ResultSet;

import java.util.ArrayList;

 

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

 

import op.db.ConnectionManager;

import op.model.students;

 

public class cardlist extends HttpServlet {

 

    public cardlist() {

        super();

    }

 

    public void destroy() {

        super.destroy(); // Just puts "destroy" string in log

        // Put your code here

    }

 

    public void doGet(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

 

        doPost(request,response);

    }

 

    public void doPost(HttpServletRequest request, HttpServletResponse response)

            throws ServletException, IOException {

        String cardid=request.getParameter("txtcardid");

        String cardname=request.getParameter("txtcardname");

       

        String sqllist="select stuid,stuName,stuSex,stuNo,stuDept,stuClass,stuPhoto,stuMark from students where 1=1";

        if((cardid!=null)&&(!cardid.equals(""))){

            sqllist=sqllist+" and stuid="+cardid;

        }

        if((cardname!=null)&&(!cardname.equals(""))){

            sqllist=sqllist+" and stuName='"+cardname+"'";

        }

       

        ArrayList ary=new ArrayList();

        Connection con=ConnectionManager.getConnection();

        try{

            PreparedStatement pstmt=con.prepareStatement(sqllist);

            ResultSet rs=pstmt.executeQuery();

            while(rs.next()){

                students stu=new students();

                int stuid=rs.getInt("stuid");       //数据类型转换

                String stuidsg=String.valueOf(stuid);

                stu.setStuidsg(stuidsg);

                stu.setStuname(rs.getString("stuName"));

                stu.setStusex(rs.getString("stuSex"));

                stu.setStuno(rs.getString("stuNo"));

                stu.setStudept(rs.getString("stuDept"));

                stu.setStuclass(rs.getString("stuClass"));

                stu.setStuphoto(rs.getString("stuPhoto"));

                stu.setStumark(rs.getString("stuMark"));

               

                ary.add(stu);

            }

        }catch(Exception e){

            e.printStackTrace();

        }finally{

            ConnectionManager.closeConnection(con);

        }

       

        request.setAttribute("students", ary);

        request.getRequestDispatcher("/pagebbms/cardlist.jsp").forward(request, response);

    }

 

    /**

     * Initialization of the servlet. <br>

     *

     * @throws ServletException if an error occurs

     */

    public void init() throws ServletException {

        // Put your code here

    }

 

}