How to Customize Struts2 JSON Plugin Serialization for Specific Objects?

Troubleshooting Struts2 JSON Plugin

Struts2 JSON Plugin Functionality

The Struts2 JSON Plugin operates by serializing the entire action into JSON, excluding transient properties and those without getters.

Customizing Serialization with Root Object

To serialize only a specific object, you can leverage the "root" attribute in struts.xml:

<result type="json">
    <param name="root">
        objectToBeSerialized
    </param>
</result>

Solution for Specific Case

Given a data structure with multiple rows represented as "[col1, col2]", you can create:

• A Value Object: MyRow with fields col1 and col2
• An Action class with a list of MyRow called "rows"
• Update the Struts.xml to set the "root" to "rows"

Example Implementation

Value Object (MyRow.java):

public class MyRow implements Serializable {
    private String col1;
    private String col2;

    // Getters and setters omitted for brevity
}

Action class (PartAction.java):

public class PartAction implements Serializable {
    private List<MyRow> rows;

    public List<MyRow> getRows() { return rows; }

    public String finder() {
        rows = new ArrayList<>();
        // Loop through search results and populate rows
        return Action.SUCCESS;
    }
}

Struts.xml:

<package name="default" namespace="/ajax" extends="json-default">
    <action name="finder" class="action.Part" method="finder">
        <result type="json">
            <param name="root">rows</param>
        </result>
    </action>
</package>

AJAX Callback Function:

var handledata = function(data) {
    $.each(data, function(index) {
        alert(data[index].col1);
        alert(data[index].col2);
    });
}

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