How to send Json to Struts2?

Question

There is a Json object and I don't know how to get it in struts2,there are two arrays in it,how to transfer it to ArrayList in java?

enter image description here

var params = {
        'goodsIdList':goodsIdList,
        'goodsCountList':goodsCountList
    }
    console.log(params);
    $.ajax({
        type: 'post',
        url: "checkGoodsIsEnough",
        data: params,
        dataType:"json",
        async: true,
        success: alert("success"),
        error: function (jqXHR) {
            alert(jqXHR.status);
        }

    })

here is an example on how to do it: [struts2 and json example](https://www.mkyong.com/struts2/struts-2-and-json-example/) — Kevin Kloet, Nov 21 '16 at 12:13
i want to konw how to get json object in struts2 sended by ajax,not send json object to ajax by struts — lhw1995, Nov 21 '16 at 12:25

score 2 · Answer 1 · answered Nov 21 '16 at 12:28

2

I will suppose that you have already added this config to your struts.xml to provide JSON format support :

<action name="checkGoodsIsEnough" class="ClassOf_CheckGoodsIsEnough">
        <interceptor-ref name="defaultStack"/>
         <interceptor-ref name="json">
            <param name="enableSMD">true</param>
        </interceptor-ref>
</action>

If this is the case, dont forget to convert your javascript object to JSON string format by using :

var JsonParams = JSON.stringify(params);

And then try to do the Post call as follow :

$.ajax({
    type: 'post',
    url: "checkGoodsIsEnough",
    data: JsonParams,
    dataType:"json",
    async: true,
    success: alert("success"),
    error: function (jqXHR) {
        alert(jqXHR.status);
    }

});

Hope this help!

answered Nov 21 '16 at 12:28

Ali. L

39
3

Your answer helps me.The json object is right,but how to get it in struts2? – lhw1995 Nov 21 '16 at 12:42
You must avoid implementing "ModelDriven" interface, and define – Ali. L Nov 21 '16 at 13:00
And define "attribute", "setter" and "getter" for each param in the request. – Ali. L Nov 21 '16 at 13:03
Here is a complete example of what you must do : http://tech.learnerandtutor.com/send-json-object-to-struts-2-action-by-jquery-ajax/ – Ali. L Nov 21 '16 at 13:08

score 1 · Answer 2 · edited Jun 20 '20 at 09:12

You need the struts2-json-plugin.

It serves two main purposes:

#1 - Converting Java objects to JSON through the json result (from Action to JSP);

#2 - Converting Javascript objects to JSON through the json interceptor (from JSP to Action).

While the first is automatic, for the second (that is what you want) you need to define an interceptor stack containing the json interceptor, for example:

<package name="myPackage" extends="json-default">
...
    <action name="myAction" class="foo.bar.MyAction">

        <interceptor-ref name="json"         /> <!-- #2 is here -->
        <interceptor-ref name="defaultStack" />

        <result name="success" type="json"> <!-- #1 is here -->
            <param name="root">myJavaObjectThatWillBecomeJson</param>
        </result>
        <result name="error">error.jsp</result>
    </action>
    ...

After confirming that it is working, you can (and should) define the interceptor stack once in the configuration, setting it as the default interceptor, instead of rewriting this configuration inside every action.

For the json Interceptor to run properly, the conditions are:

The "content-type" must be "application/json"

The JSON content must be well formed, see json.org for grammar.

Action must have a public "setter" method for fields that must be populated.

Supported types for population are: Primitives (int,long...String), Date, List, Map, Primitive Arrays, Other class (more on this later), and Array of Other class.

Any object in JSON, that is to be populated inside a list, or a map, will be of type Map (mapping from properties to values), any whole number will be of type Long, any decimal number will be of type Double, and any array of type List.

How to send Json to Struts2?

2 Answers2

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