CODEWITHSUNDEEP
jspservletsstruts2
Yichz
Yichz

Reputation: 9681

java how to get json from a request?

I'm posting a json request to server. I can see the http post is done correctly in firebug. (I'm sure the json format is valid)

eg. {datas:[{"a":1, "b":2},{"a":5, "b":6}]}

my question is, how do I recover this data in the server side? I read people saying to use request.getInputStream but can't figure how to convert it into string or parse with GSON.

another question: is there a limite of size of a json string I can post?

(Struts 2)

dojo.xhrPost({
                url: "sub/sub/theAction",
                postData: dojo.toJson(json),
                handleAs:'json',
                headers: { "Content-Type": "application/json; charset=utf-8"},          
                load: function(data) {      
                    alert("done");          

                        }
                }                       
            });

thanks in advance

Upvotes: 0

Views: 2224

Answers (2)

Umesh Awasthi
Umesh Awasthi

Reputation: 23587

i am not sure how DOJO works or post data but believe must be same as other javascript framework works. here is what we can do to achieve what you are trying to do

<package name="demojson" extends="struts-default,json-default">
    <action name="jsonTest" class="com.demo.action.JsonTestAction">
        <interceptor-ref name="json">
            <param name="contentType">application/json</param>
        </interceptor-ref>
        <result type="json"/>
    </action>
</package>

public class JsonTestAction extends ActionSupport
{
        private static final long serialVersionUID = 1L;
        private Map data = new HashMap();
        // log decelaration         
        public Map getData()
        {
                return data;
        }

        public void setData(Map data)
        {
                this.data = data;
        }

        @Override
        public String execute()
        {
                logger.log(Level.FINE, "action parameters: " + data);

                return SUCCESS;
        }
}


var submit = function()
{
    var data = {data: {j1 : 'one', j2: 'two', j3: [1, 2, 3, 4, 5], j4: {a: 'A', b: 2, c: '3'}, j5: 2, j6: '2'}};
    jQuery.ajax(
    {
        type: 'POST', 
        url: '/blah/jsonTest.action', 
        data: jQuery.toJSON(data),
        dataType: 'json',
        async: false ,
        contentType: 'application/json; charset=utf-8',
        success: do what you want here}
    });

how json works with Struts2 refer this

JSON Plugin for Struts2 };

hope this will help you

Upvotes: 1

Dave Newton
Dave Newton

Reputation: 160301

Use the JSON Plugin along with its interceptor; the Struts 2 action will be populated using the request data.

Note the requirements for the JSON on the plugin docs page.

Upvotes: 0

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