pass a javascript object to a jsp page using jquery

Question

i have in javascript

var data = new Object();

and some attributes for this object are:

data.name = "mike";
data.id = 1;

i use jquery to pass the object to a jsp page

var request = $.ajax
({
 url: "test.jsp",
 type: "post",
 data:  'obj='+ data,
success:    function(msg) {
     $('#response').html(msg);},
  error:function (xhr, ajaxOptions, thrownError){
 alert(xhr.status);
 alert(thrownError);
}  
});

in the jsp i say

Object objParam = request.getParameter("obj"); out.println(objParam.name);

this doesn't seem to work. please help.

zz3599 · Accepted Answer · 2013-01-27 02:17:31Z

2

Because you are posting to the JSP, make sure that you handle inside a doPost(request, response) method.
Generally, all data passed should be in JSON format. In your case, it should read
```
data: {'obj' : data}
```

To parse on the server side, use the org.json library:

    JSONObject obj = (JSONObject) JSONValue.parse(request.getParameter("obj"));
    Iterator<?> keys = obj.keys();            
    //iterate over the properties of the JSON object
    while( keys.hasNext() ){
        String key = (String)keys.next();
        if( obj.get(key) instanceof JSONObject ){
            //a JSONObject inside the JSONObject
        } else {
            //process
        }
    }

See the docs: JSONObject

edited Jan 27, 2013 at 2:17

answered Jan 26, 2013 at 5:16

zz3599

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5 Comments

user2012998 Over a year ago

I changed the way the data is passed to JSon but I don't know the code syntax for a dopost.

user2012998 Over a year ago

yes, but i'm passing a javascript object with attributes through jquery and then to jsp. i want jsp to dissect the object and return the individual attributes. how do i do that?

zz3599 Over a year ago

I just edited my answer to include how to process on server side.

zz3599 Over a year ago

If you find an answer that works, please let the community know by marking it as correct.

user2012998 Over a year ago

the answers given here do not work, they are overcomplicated and i am just a noobie

Abhijeet Pawar · Accepted Answer · 2013-01-26 06:59:22Z

0

The object of javascript is different from the object of java. The two are not at all comparable. Here you are sending javascript object as is. This should be changed to json string.

data:  'obj='+ JSON.stringify(data),

And also on server you should get the json string and then convert that json to java object by using some of the mechanisms like ObjectMapper

Object objParam = request.getParameter("obj");

ObjectMapper om = new ObjectMapper();
om.readValue(objParam.toString(), ...);

answered Jan 26, 2013 at 6:59

Abhijeet Pawar

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2 Comments

user2012998 Over a year ago

so how do i dissect the javascript object in the jsp? i want the attributes as is shown above out.println(obj.name);

Abhijeet Pawar Over a year ago

ObjectMapper class has provided the readValue function which allows you to convert. See this tutorial mkyong.com/java/how-to-convert-java-object-to-from-json-jackson

santhoshkumar · Accepted Answer · 2013-03-26 10:42:53Z

0

you can pass json data(javascript object converted into json data using json.stringify()) in client side.In service side ,using Gson Libarary you can map json data with java object.

    public class User{
private String userName;
//getters
//setters
    }

Json format

{"userName":"test_username"}

Now you can map json data to java object using GSON library.

for example plz refer the below link

https://sites.google.com/site/gson/gson-user-guide

answered Mar 26, 2013 at 10:42

santhoshkumar

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