JQuery+ajax+jsonp 跨域访问

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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

一.客户端

Html代码

    <!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>

二.服务器端

Java代码

    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();            }          }      }  Java代码  收藏代码    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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