ajax跨域请求--jsonp实例

ajax请求代码:

@RequestMapping("/pagelist/jsonp")  
    public void pagelist(@ModelAttribute TransportNode node,HttpServletRequest httpReq,  
            HttpSession session,HttpServletResponse response) {  
          
        //返回头部设置    
        response.setHeader("Pragma", "No-cache");    
        response.setHeader("Cache-Control", "no-cache");   
        response.setHeader("Content-type", "application/x-javascript;charset=utf-8");  
        response.setDateHeader("Expires", 0);    
          
        String jsonpCallback = httpReq.getParameter("callbackFunction");//jsonp回调函数名   
        JSONObject resultJson  = new JSONObject();   
        PrintWriter out = null;        
        try {  
            out = response.getWriter();  
        } catch (IOException e1) {  
            e1.printStackTrace();  
        }    
        try {  
            node.setRowStart((node.getPage() - 1) * node.getRows() + 1);  
            node.setRowEnd(node.getPage() * node.getRows());  
                                      
            resultJson.put("transportList", JsonUtils.toJSONList(business.getList(node)));  
            resultJson.put("success", true);      
            System.out.println(resultJson.toString());  
            out.println(jsonpCallback+"("+resultJson.toString()+")");//返回jsonp格式数据    
            out.flush();    
            out.close();    
              
        } catch (Exception e) {  
            LogWriter.log("/pagelist/jsonp",e);  
            try {  
                resultJson.put("success", false);  
            } catch (JSONException e1) {  
                e1.printStackTrace();  
            }       
            out.println(jsonpCallback+"("+resultJson.toString()+")");//返回jsonp格式数据    
            out.flush();    
            out.close();    
        }  

注意要点:

1.设置响应报文头,response.setHeader("Content-type", "application/x-javascript;charset=utf-8");,消除了"Resource interpreted as Script but transferred with MIME type text/plain",同时要根据自己的编码格式设置正确的编码;

2.jsonp的数据格式是:jsonpCallback+"("+resultJson.toString()+")"

举个例子:

jsonpCallback({
    "code": "aaa",
    "price": 1780,
    "tickets": 5
});