response输出字符流以及解决乱码

package cn.itcast.servlet.web;

import java.io.IOException;
import java.io.PrintWriter;

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

/**
 * Servlet implementation class ResponseDemo1
 */
@WebServlet("/ResponseDemo4")
public class ResponseDemo4 extends HttpServlet {
    private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public ResponseDemo4() {
        super();
        // TODO Auto-generated constructor stub
    }

    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        //获取流对象之前设置流的默认编码，默认编码是:ISO-8859-1  设置为GBK
        //windows系统下默认浏览器编码为GBK
//        response.setCharacterEncoding("utf-8");
        //告诉浏览器，服务器发送的消息体数据的编码。建议浏览器使用该编码解码
        //浏览器收到这个消息就特别听话，就按照执行了
//        response.setHeader("content-type", "text/html;charset=utf-8");
        
        //简单的形式，设置编码
        response.setContentType("text/html;charset=utf-8");
        
        
        
        //1.获取字符输出流
        PrintWriter pw = response.getWriter();
        //2.输出数据
        pw.write("hello response");
        System.out.println();
        pw.write("你好 response");
    }

    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        doGet(request, response);
//        this.doGet(request, response);
    }

}