完美解决在Servlet中出现一个输出中文乱码的问题

 @Override
  public void doPost(HttpServletRequest reqeust, HttpServletResponse response)
    throws ServletException, IOException { 

     //PrintWriter out = response.getWriter();在还没有给response指定编码格式时就获取了他的输出流，所以一直乱码 

   reqeust.setCharacterEncoding("utf-8");
   response.setContentType("text/html;charset=utf-8");
   response.setCharacterEncoding("utf-8");
   PrintWriter out = response.getWriter(); //在设置完编码以后在获取输出流就好了。
   jsonService = new JsonService();
   String jsonString = JsonTools.createJsonString("persons", jsonService.getPersonList());
   out.println(jsonString);
   out.flush();
   out.close();
   }