利用json绕过浏览器安全限制，实现跨域访问

客户端代码：

    <script language="javascript" type="text/javascript" src="json.js"></script>
    
    <script type="text/javascript">
    	function getJSON(obj){
    		var boy = obj.toJSONString();
    		var boyName = obj.name;
    		var boyAge = obj.age;
    		alert(boyName+"  "+boyAge);
    	}
    </script>

    <script src="http://localhost:8080/jsonExa/servlet/Server1?callback=getJSON" type="text/javascript">
    </script>

服务器端：

public void process(HttpServletRequest request, HttpServletResponse response)
			throws ServletException, IOException {
		
		response.setContentType("text/html");
		response.setCharacterEncoding("utf-8");
		String callbackFunc = request.getParameter("callback");
		PrintWriter out = response.getWriter();
		String resJSON = "{'name':'jj', 'age':20}";
//		System.out.println(callbackFunc+"("+resJSON+")");
		//JSONObject jsonObject = JSONObject.fromString(resJSON);  
		JSONObject resultJSON;
		try {
			resultJSON = new JSONObject(resJSON);
			System.out.println(callbackFunc+"("+resultJSON+")");
			out.println(callbackFunc+"("+resultJSON+")");
			out.flush();
			out.close();
		} catch (ParseException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}