• 向server传值

JS:
url = "http://...do?para=" + encodeURI(encodeURI("中文"));//此处要编码两次！
xmlHTTP.open("POST",url,true);
Action:
String para = request.getParameter("para");
para = java.net.URLDecoder.decode(para, "UTF-8");

• 向client写回

 public static void writeStringToClient(HttpServletResponse response,
   String strMsg) {
  response.setContentType("text/html; charset=utf-8");
  try {
   response.getWriter().print(strMsg);
  } catch (IOException e) {
   e.printStackTrace();
  }
 }
用JS写了一个类似google searchBar的搜索条，就是因为这个问题困扰了半天