Jsonp(JSON with Padding)是資料格式 json 的一種“使用模式”,可以讓網(wǎng)頁(yè)從別的網(wǎng)域獲取資料。
一. 客戶端
<!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(jiǎn)寫(xiě)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",//數(shù)據(jù)類型為jsonp
jsonp: "jsonpCallback",//服務(wù)端用于接收callback調(diào)用的function名的參數(shù)
success : function(data){
$("#showcontent").text("Result:"+data.result)
},
error:function(){
alert('fail');
}
});
});
</script>
<body>
<div id="showcontent">Result:</div>
</body>
</html>
二. 服務(wù)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(jù)需要拼裝json
String jsonpCallback = request.getParameter("jsonpCallback");//客戶端請(qǐng)求參數(shù)
out.println(jsonpCallback+"("+resultJSON.toString(1,1)+")");//返回jsonp格式數(shù)據(jù)
out.flush();
out.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
以上就是小編為大家?guī)?lái)的淺談JQuery+ajax+jsonp 跨域訪問(wèn)全部?jī)?nèi)容了