Two ways controller returns JSON data in SPRINGMVC

In SPRINGMVC, the controller returns JSON data in two ways, 1.jsp Ajax requests:

function Getjson () {    $.ajax ({        type:"get",        DataType:"JSON",        URL:"<%= BasePath%>getjson ",        success:function(data) {            for(var i=0;i<jsondata.length;i++) {                alert ("Id:" +data[i].id+ "   Username:" +data[i]. username);            }        },
Error:function (e) {
Alert (e);
　　    }    })}

2. Method One: Use SPRINGMVC native annotations @responsebody

    @ResponseBody    @RequestMapping ("/getjson")    public Object Getjson () {         return new Object ();    }

Attention:

[Email protected] Function: The return value of the target method is automatically converted to JSON format, and then returned to the front end 3. Method Two:

Using the JSON tool class for manual writing

    @RequestMapping ("/getjson")    publicvoid  Getjson (httpservletresponse Response) {
Object obj = new Object ();
　      = Jsonobject.fromobject (obj);        Jsonutils.ajaxjson (json.tostring (), response);    }

Attach the code for the Jsonutils tool class:

Importjava.io.IOException;ImportJavax.servlet.http.HttpServletResponse; Public classJsonutils { Public Static voidAjaxjson (String jsonstring,httpservletresponse response) {Ajax (jsonstring,"Application/json", response); }     Public Static voidAjax (String content, string Type,httpservletresponse response) {Try{response.setcontenttype (type+ "; Charset=utf-8"); Response.setheader ("Pragma", "No-cache"); Response.setheader ("Cache-control", "No-cache"); Response.setdateheader ("Expires", 0);            Response.getwriter (). write (content);        Response.getwriter (). Flush (); } Catch(IOException e) {e.printstacktrace (); }    }}

Two ways controller returns JSON data in SPRINGMVC