JQuery+Ajax+jsonp 跨域访问
Jsonp(JSON with Padding)是资料格式 json 的一种“使用模式”,可以让网页从别的网域获取资料。
关于Jsonp更详细的资料请参考http://baike.baidu.com/view/2131174.htm,下面给出例子:
一.客户端
Html代码
- <!DOCTYPEhtmlPUBLIC"-//W3C//DTDHTML4.01Transitional//EN""http://www.w3.org/TR/html4/loose.dtd">
- <html>
- <head>
- <metahttp-equiv="Content-Type"content="text/html;charset=UTF-8">
- <title>Inserttitlehere</title>
- <scripttype="text/javascript"src="resource/js/jquery-1.7.2.js"></script>
- </head>
- <scripttype="text/Javascript">
- $(function(){
- /*
- //简写形式,效果相同
- $.getJSON("http://app.example.com/base/json.do?sid=1494&busiId=101&jsonpCallback=?",
- function(data){
- $("#showcontent").text("Result:"+data.result)
- });
- */
- $.ajax({
- type:"get",
- async:false,
- url:"http://app.example.com/base/json.do?sid=1494&busiId=101",
- dataType:"jsonp",//数据类型为jsonp
- jsonp:"jsonpCallback",//服务端用于接收callback调用的function名的参数
- success:function(data){
- $("#showcontent").text("Result:"+data.result)
- },
- error:function(){
- alert('fail');
- }
- });
- });
- </script>
- <body>
- <divid="showcontent">Result:</div>
- </body>
- </html>
二.服务器端
Java代码
- importjava.io.IOException;
- importjava.io.PRintWriter;
- importjava.util.HashMap;
- importjava.util.Map;
- importjavax.servlet.http.HttpServletRequest;
- importjavax.servlet.http.HttpServletResponse;
- importnet.sf.json.JSONObject;
- importorg.springframework.stereotype.Controller;
- importorg.springframework.web.bind.annotation.RequestMapping;
- @Controller
- publicclassExchangeJsonController{
- @RequestMapping("/base/json.do")
- publicvoidexchangeJson(HttpServletRequestrequest,HttpServletResponseresponse){
- try{
- response.setContentType("text/plain");
- response.setHeader("Pragma","No-cache");
- response.setHeader("Cache-Control","no-cache");
- response.setDateHeader("Expires",0);
- Map<String,String>map=newHashMap<String,String>();
- map.put("result","content");
- PrintWriterout=response.getWriter();
- JSONObjectresultJSON=JSONObject.fromObject(map);//根据需要拼装json
- StringjsonpCallback=request.getParameter("jsonpCallback");//客户端请求参数
- out.println(jsonpCallback+"("+resultJSON.toString(1,1)+")");//返回jsonp格式数据
- out.flush();
- out.close();
- }catch(IOExceptione){
- e.printStackTrace();
- }
- }
- }