调用接口跨域问题：客户端 ~~服务端

    <!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(){     
        /*  
        //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>

服务端：

    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();  
          }  
        }  
    }

调用接口跨域问题：客户端 ~~服务端

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