struts2 注解方式下载文件

@Namespace("/manage")
@ParentPackage("manage")
public class DownloadAction extends ActionImpl {

	private String fileName;

	public String getFileName() {
		return fileName;
	}

	public void setFileName(String fileName) {
		this.fileName = fileName;
	}

	@Action(value = "download", results = { @Result(name = "success", type = "stream", params = {
			"contentType", "application/octet-stream", "inputName",
			"inputStream", "contentDisposition",
			"attachment;filename=\"${fileName}\"" }) })
	public String execute() {
		System.out.println(fileName+"------=====");
		return SUCCESS;
	}
	
	/*
	 * 获取下载读入流，必须要有方法
	 * 在@Result 注解的参数params中，key为“inputName”所对应的value“inputStream”，
	 * 决定该方法名为getInputStream
	 */
	public InputStream getInputStream(){
		String reFileName = fileName;
		try{
			//设置文件的名字
			setFileName(new String(fileName.substring(fileName.lastIndexOf('/')+1).getBytes(),"iso8859-1"));
			return new FileInputStream("D:/eclipse/workspace/ccsp2/"+reFileName);
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
		
		return null;
	}
	

	@Override
	public Object getModel() {
		return null;
	}

}