<script type="text/javascript" src="js/json.js"></script>
<script type="text/javascript" src="prototype.js"></script>
<script type="text/javascript">
            function sendRequest(){
                var url="/JSON/JSONTest1";
                alert("json");
                var mailAjax=new Ajax.Request(
                            url,
                            {
                                method:'get',
                                onComplete:jsonResponse
                            }
                        );
                alert("json");
            }
            function jsonResponse(originalRequest){
                alert(originalRequest.responseText);
                var myobj=originalRequest.responseText.parseJSON();
                alert(myobj.name);
            }
</script>

PrintWriter out=resp.getWriter();
out.print("{\"name\":\"liuyong\",\"age\":21}");
out.flush();
out.close();