ajax请求代码:

//区域事件选择配送点
function changeDistrict(value){
	 if(value =http://www.mamicode.com/= 0){>
要点:
1.url中的请求参数callbackFunction=jsonpCallback这是服务器响应返回后调用的javascript方法的名称
2.dataType要为jsonp

跨域服务器处理代码:
@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
});