标签:javascript ajax jsonp
问题来源:一个jsp页面上有个链接需要访问第三方接口,第三方并返回数据给我。
问题思路:首先思考的就是使用AJAX异步方式将他所需的数据给第三方接口,第三方接口返回一系列参数,并根据SUCCESS参数,在页面上弹框显示。
过程解析:页面上写完整AJAX返回JSON数据发现不管怎么样都执行error,经过一系列的查找找到问题所在为AJAX跨域获取数据只能用JSONP,(伤心,看了API才明白是怎么回事),贴下代码:
JSP页面:
<%@ page language="java" import="java.util.*" pageEncoding="gbk"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>My JSP 'index.jsp' starting page</title> <meta http-equiv="pragma" content="no-cache"> <meta http-equiv="cache-control" content="no-cache"> <meta http-equiv="expires" content="0"> <meta http-equiv="keywords" content="keyword1,keyword2,keyword3"> <meta http-equiv="description" content="This is my page">
<script type="text/javascript" src="common/jquery-1.6.min.js"></script> <script type="text/javascript" > function insert(){ $.ajax({ type:"GET", url:"http://10.40.114.59:8090/test/test.action", dataType:"jsonp", jsonp:"callbackParam", jsonpCallback:"success_jsonCallback", success:function(json){ alert(json); alert("success"); }, error:function(){ alert("error"); } }); } </script> </head> <body> <br/> <input type="button" value="测试" onclick="insert()"/> </body> </html>
Servlet代码:
<servlet> <servlet-name>test</servlet-name> <servlet-class>test.ReceiveformAction</servlet-class> </servlet> <servlet-mapping> <servlet-name>test</servlet-name> <url-pattern>*.action</url-pattern> </servlet-mapping>
JAVA代码:
package test; import java.io.IOException; import java.io.PrintWriter; import java.util.HashMap; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.json.JSONException; import org.json.JSONObject; public class ReceiveformAction extends HttpServlet{ public void doGet(HttpServletRequest request,HttpServletResponse response) { try { PrintWriter out = response.getWriter(); String callbackName = request.getParameter("callbackParam"); HashMap<String,String> hMap = new HashMap<String,String>(); hMap.put("success", "true"); out.write(callbackName+"("+JSONObject.valueToString(hMap).toString()+")"); } catch (IOException e) { e.printStackTrace(); } catch (JSONException e) { e.printStackTrace(); } } }
抓包截图:
返回数据:
标签:javascript ajax jsonp
原文地址:http://blog.csdn.net/lyy176/article/details/45646163