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 blocke.printStackTrace();}}