在Servlet中出现一个输出中文乱码的问题，已经解。 
 @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(); 
  }