Servlet中Request请求转发和重定向遇到的乱码问题

已经把项目的文字编码格式改成了utf-8，但还是在转发的时候遇到乱码。

先把我的代码拷上来

package com.servlet;


import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;


import com.po.Users;

public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 5285600116871825644L;


public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {


}


public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {


response.setContentType("text/html");
PrintWriter out = response.getWriter();
Users users =new Users();
String username = request.getParameter("username");
String password = request.getParameter("password");
users.setUsername(username);
users.setPassword(password);

if(users.getUsername().equals("Xeonmic")&&users.getPassword().equals("521rj")){
response.sendRedirect(request.getContextPath()+"/success.jsp");
}
else {
request.getRequestDispatcher("/fail.jsp").forward(request, response);
//response.sendRedirect(request.getContextPath()+"/fail.jsp");
}

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


}
这样会导致转发请求乱码

这个时候我把PrintWriter和out.flush,out.close这三行注释掉就不会乱码了。