servlet中通过request.getRequestDispatcher跳转到jsp页面乱码问题

public class ValidateUserServlet extends HttpServlet {

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html");
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
PrintWriter out = response.getWriter();
doPost(request, response);
out.flush();
out.close();
}

public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
request.setCharacterEncoding("UTF-8");
response.setCharacterEncoding("UTF-8");
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String userName = request.getParameter("userName");
String userPass = request.getParameter("userPass");
System.out.println("userName"+userName);
System.out.println("userPass"+userPass);
User user = new User();
user.setUserName(userName);
user.setUserPass(userPass);
ValidateUser validaetUser = new ValidateUser();
ResultSet rs = validaetUser.validaetUser(user);

try {
while(rs.next()){
System.out.println(rs.getString(2));
if(rs.getInt(3)==1){
//response.sendRedirect("liulan.jsp");
request.getRequestDispatcher("zhuce.jsp").forward(request, response);   //转发后乱码，在doGet  中加上request.setCharacterEncoding("UTF-8");
} //正常
}
} catch (SQLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

out.flush();
out.close();
}