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Using a Struts 2 plugin (e.g., JSON plugin, jQuery plugin, etc.) is, in general, preferred to writing the response directly from within an action. See sections following this for further details.

package actions;

import java.io.InputStream;
import java.io.StringBufferInputStream;
import com.opensymphony.xwork2.ActionSupport;

public class TextResult extends ActionSupport  {
    private InputStream inputStream;
    public InputStream getInputStream() {
        return inputStream;
    }

    public String execute() throws Exception {
        inputStream = new ByteArrayInputStream("Hello World! This is a text string response from a Struts 2 Action.".getBytes("UTF-8"));
        return SUCCESS;
    }
}