SPRINGMVC receive JSON string parameters

1 /**2 The foreground JS stitching an array myparam = [a,b,c]; in Ajax directly {"Myparam": Json.stringify (Myparam)} in the controller that is passed in Springmvc, the receiver can receive 3 */4@RequestMapping (value= "/AAA")5 @ResponseBody6  Public voidAAA (@RequestParam (value= "Myparam") Object Myparam) {//@RequestParam (value= "Myparam") can also not write, the default is it7Gson Gson =NewGson ();8List mylist = Gson.fromjson (myparam.tostring (), list.class);9      for(intI;i<mylist.size (); i++){TenString item = mylist.get (i). toString ();//get each element of an array One     } A          -}

The above can also be written like this:

1 /**2 The front desk JS stitching an array myparam = [a,b,c]; in Ajax directly {"Myparam": Myparam} in the controller that incoming SPRINGMVC, the receiver can receive this3 */4@RequestMapping (value= "/AAA")5 @ResponseBody6  Public voidAAA (string[] myparam) {//in this writing, the foreground cannot pass the JSON string, to pass the array object directly myparam not to go json.stringify7     8      for(inti;i<myparam.length;i++){9Myparam[i]//get each element of an arrayTen     } One          A } - //In addition, if you submit with Ajaxsubmit, you can simply throw the myparam in myparam = [A,b,c] into the Val of the input box, which is: $ ("#inputArr"). Val (myparam) - //and then directly ajaxsubmit the form submission, the effect is the same as the above Myparam will be passed as an array object to the background.  the //that is, not the input box can only submit strings, throwing the array of objects in is also possible. You can still commit the object. 

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Here are some other types of JSON data that you can refer to below

//js defining JSON Objects            var username = $ ("#username"). Val ();             var password = $ ("#password"). Val ();             var json = {                "username" : username,                "password" : Password            };

$.ajax ({URL:"Jsontest", type:"POST", Async:true, ContentType:"Application/json", Data:JSON.stringify (JSON), DataType:' JSON ', Success:function(data) {if(Data.userstatus = = = "Success") {                        $("#errorMsg"). Remove (); } Else {                        if($ ("#errorMsg"). Length <= 0) {                            $("Form[name=loginform]"). Append (errormsg); }                    }                }            });

@RequestMapping ("/jsontest")    publicvoid Test (@RequestBody (required=true ) map<string,object> Map  ) {        = Map.get ("username"). toString ();         = Map.get ("password"). toString ();        System.out.println ("username:" + username);        System.out.println ("Password:" + password);    }

This method of receiving the map requires that the background must be annotated with @requestbody, but this requires Ajax to use

"Application/json"

, a 400 error is reported when the same request passes a number of other string arguments, in addition to passing the JSON type. This is a mishap, in this way, the controller layer method can only receive a JSON-type parameter, no longer have other types of parameters.

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You can also refer to the following:

@Controller @requestmapping ("/admin/obj") Public classobjaction {/*** Front-end operation same as above *@return     */@RequestMapping (Value= "/updateattr") @ResponseBody PublicString updateattr (@RequestBody map<string, string>map) {        if(Map.containskey ("id") {Integer ID= Integer.parseint (Map.get ("id")); }        if(Map.containskey ("objname") {String objname= Map.get ("objname"). toString (); }        if(Map.containskey ("pid") {Integer pid= Integer.parseint (Map.get ("pid")); }        //operation ...        return"Success"; }}

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You can also refer to this:

JS Code:

12<title>submitUserList_3</title>3<meta http-equiv= "Content-type" content= "text/html; Charset=utf-8 ">4<script language= "JavaScript" src= "/js/jquery.min.js" ></script>5<script language= "JavaScript" src= "/js/jquery.json.min.js" ></script>6<script type= "Text/javascript" language= "JavaScript" >7         functionSubmituserlist_3 () {alert ("OK");8             varCustomerarray =NewArray ();9Customerarray.push ({id: "1", Name: "John Doe", PWD: "123"});TenCustomerarray.push ({ID: "2", Name: "Zhang San", pwd: "332"}); One $.ajax ({ AURL: "/user/submituserlist_3", -Type: "POST", -ContentType: ' Application/json;charset=utf-8 ',//Set Request header information theDataType: "JSON", -                 //data:JSON.stringify (Customerarray),//JSON object serialized into JSON string, json.stringify () primitive Ecological Method -Data: $.tojson (Customerarray),//serializes a JSON object into a JSON string, ToJSON () requires a reference jquery.json.min.js -Successfunction(data) { + alert (data); -                 }, +Errorfunction(res) { A alert (res.responsetext); at                 } -             }); -         } -</script> -
Java code:
1@RequestMapping (value = "/submituserlist_3", method ={requestmethod.post})2 @ResponseBody3      PublicString Submituserlist_3 (@RequestBody list<user>users)4             throwsexception{5String result = "";6         if(Users = =NULL|| Users.size () <= 0) {return"No any ID. Chinese"; }7result = This. Showuserlist (users);8         returnresult;9}
SPRINGMVC receive JSON string parameters