how to use webwork filedown

i want to use webwork down file,but i don't know how to write code in web page.

xwork.xml:
<action name="downlicense"
			class="com.lingyitech.ap.action.DownLicenseAction">
			<param name="inputPath">/ip.txt</param>
			<result name="success" type="dispatcher">
				<param name="location">/license.html</param>
			</result>
			<result name="input">
				<param name="location">/license.html</param>
			</result>
			<result name="download" type="stream">
				<param name="contentType">
					application/x-msdownload
				</param>
				<param name="inputName">docStream</param>
				<param name="bufferSize">1024</param>
				<param name="contentDisposition">
					${contentDisposition}
				</param>
			</result>
			<interceptor-ref name="params" />
		</action>
DownLicenseAction:
public FileInputStream docStream;
	public String contentDisposition;
	public File input;
	public String downLoadFile() {
		try {
			input = new File("f:/ip.txt");System.out.println("input");
			docStream = new FileInputStream(input);
			contentDisposition = "filename=\"ip.txt\"";
		} catch (FileNotFoundException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
  
		return "download";
	}
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