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:

<!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(){     
    /*  
    //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>  
<div id="showcontent">Result:</div>  
</body>  
</html>  
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); //根据需要拼装json  
        String jsonpCallback = 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 (IOException e) {  
       e.printStackTrace();  
      }  
    }  
}  

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转载自sean2012.iteye.com/blog/2306358