Jquery使用jsonp跨域访问

function loadJsonP(){
    	$.ajax({
             url:'http://192.168.28.128:8080/JsonPDemo/servlet/JsonPServlet?callback=jsonpcallback',
             dataType:"jsonp",
             success:function(data){
                 alert(data);
             }
        });
    }
    function jsonpcallback(data){
    	alert(data[0]['name']);
    }

public void doGet(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {

		response.setContentType("text/html");
		response.setCharacterEncoding("utf-8");
		PrintWriter out = response.getWriter();
		String jsonp = request.getParameter("callback");
		String str = "[{'id':'1','name':'测试1'},{'id':'2','name':'测试2'}]";
		str = jsonp + "(" + str + ")";
		out.println(str);
		out.flush();
		out.close();
	}