JQuery Ajax jsonp

JQuery ajax jsonp

　　

$.ajax({
        method:"POST",
        url:"http://localhost:8081/ChenLei/PeopleServlet",
        data:{"userName":"zhangsan"},
        dataType:"jsonp",
        jsonpCallback:"callback",   //jsonpCallback是实现跨域请求的时候定义回调函数用的 ，可以随意起名字
        success:function(data){
            alert(data.code);
            alert(data.message);
        },
        error:function(data){
        },
        complete:function(){
        }
    })

　后台如果是servlet

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        System.out.println(request.getParameter("userName"));
        String callback = request.getParameter("callback");
        response.getWriter().print(callback+"({\"code\":\"200\",\"message\":\"success!!\"})");
}   
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       doGet(request, response);
}

如果是Springmvc

import com.fasterxml.jackson.databind.util.JSONPObject;

@RequestMapping(value = "/chenlei/test/getuser", method = {RequestMethod.GET,RequestMethod.POST})
@ResponseBody
public JSONPObject getUser(@RequestParam String userName, @RequestParam String callback){
        Map<String, String> map = new HashMap<String, String>();
        map.put("code", "200");
        map.put("message", "success!!");
        return new JSONPObject(callback, map);
}