response的Writer输出数据的问题

 package cn.itcast.response;

 import java.io.IOException;
 import java.io.OutputStream;
 import java.io.PrintWriter;
 import java.io.UnsupportedEncodingException;

 import javax.servlet.ServletException;
 import javax.servlet.http.HttpServlet;
 import javax.servlet.http.HttpServletRequest;
 import javax.servlet.http.HttpServletResponse;

 //通过Response的writer留输出数据的问题
 public class ResponseDemo extends HttpServlet {

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

         test1(response);
     }

     private void test2(HttpServletResponse response) throws IOException {
         //设置response使用的码表，以控制response以什么码表向浏览器写出数据。
         response.setCharacterEncoding("UTF-8");

         //指定浏览器以什么码表打开服务器发送数据。
         response.setContentType("text/html;charset=utf-8");

         String data="中国";

         PrintWriter pw = response.getWriter();
         pw.write(data);
     }

     private void test1(HttpServletResponse response) throws IOException {
         //设置response使用的码表，以控制response以什么码表向浏览器写出数据。
         response.setCharacterEncoding("UTF-8");

         //指定浏览器以什么码表打开服务器发送数据。
         response.setHeader("Content-type", "text/html;charset=utf-8");

         String data="中国";

         PrintWriter pw = response.getWriter();
         pw.write(data);
     }

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

     }

 }