Jsonp(JSON with Padding)是資料格式 json 的一種“使用模式”，可以讓網頁從別的網域擷取資料。
一. 用戶端
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script type="text/javascript" src="resource/js/jquery-1.7.2.js"></script> </head> <script type="text/javascript"> $(function(){ /* //簡寫形式，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",//資料類型為jsonp jsonp: "jsonpCallback",//服務端用於接收callback調用的function名的參數 success : function(data){ $("#showcontent").text("Result:"+data.result) }, error:function(){ alert('fail'); } }); }); </script> <body> <div id="showcontent">Result:</div> </body> </html>
二. 伺服器端
import java.io.IOException; import java.io.PrintWriter; import java.util.HashMap; import java.util.Map; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import net.sf.json.JSONObject; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; @Controller public class ExchangeJsonController { @RequestMapping("/base/json.do") public void exchangeJson(HttpServletRequest request,HttpServletResponse response) { try { response.setContentType("text/plain"); response.setHeader("Pragma", "No-cache"); response.setHeader("Cache-Control", "no-cache"); response.setDateHeader("Expires", 0); Map<String,String> map = new HashMap<String,String>(); map.put("result", "content"); PrintWriter out = response.getWriter(); JSONObject resultJSON = JSONObject.fromObject(map); //根據需要拼裝json String jsonpCallback = request.getParameter("jsonpCallback");//用戶端請求參數 out.println(jsonpCallback+"("+resultJSON.toString(1,1)+")");//返回jsonp格式資料 out.flush(); out.close(); } catch (IOException e) { e.printStackTrace(); } } }
以上就是小編為大家帶來的淺談JQuery+ajax+jsonp 跨域訪問全部內容了，希望大家多多支援雲棲社區~
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