struts2 返回纯字符串

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 StringBufferInputStream("ok"); return SUCCESS; } } 

struts.xml:
<action name="text-result" class="actions.TextResult">
<result type="stream">
<param name="contentType">text/html </param>
<param name="inputName">inputStream </param>
</result>
</action>